Method for burning solid or semi-solid fuel

Abstract

A mixed low-carbon alcohol ignition agent in a gel paste or a thin cake, and a cylindrical fire-leading coal and a cylindrical coal placed underneath having a high volatile content and honeycomb-like vent holes which are made from solid fuels such as bitumite, lignite, biomass fuels, polyolefin and waste plastics as well as nontoxic excipients, are vertically combined into a coal pile to be combusted in a furnace core, and the number of the pile may be increased. A firing slip of paper is thrown in to ignite the ignition agent from the top, a long-flame combustion is generated soon, and the fire-leading coal catches fire. A high-temperature zone ranging from 400 C. to 800 C. may be rapidly formed in a simple large combustion chamber between the top of the coal pile and the fire-gathering plate. The radiant heat plus the conductive heat is greater than the convective heat, and the red hot coal layer on the surface of the fire-leading coal will gradually move down at a rapid speed, which causes the coal placed underneath to catch fire. The three major components of the coal pile are elaborately formulated and prepared. The material of the furnace core must fit the coal pile. The high-temperature zone is in the upper portion and the low-temperature zone is in the lower portion, which produces an orderly, long-flame, complete combustion and a static combustion without an air blast, thus realizing a combustion with zero smog throughout the whole process starting from the moment of ignition. In addition, the sulfur-fixing rate is high, the cleanliness of the exhaust gas is close to that of natural gas, the exhaust gas may be discharged directly, the heat-generating efficiency is high, the cost is low, the slag is used as a fertilizer, and it is suitable for various small- and micro-sized stoves for heating and warming.

Claims

1-16. (canceled)

17. A zero-smog combustion technology of bitumite, lignite, biomass fuels, and waste plastics such as polyolefin, in comparison with a way of combusting a combustible solid substance such as bitumite, lignite and a plant fuel dispersedly and disorderly in existing medium-, small- and micro-sized stoves that leads to a massive amount of many kinds of pollutants such as smog in exhaust emission, the combustion technology is characterized by integrating 6 techniques, i.e., {circumflex over (1)} a gel paste or gel thin cake of low-carbon alcohols is used in combination with a straw charcoal grille as an oxidant-free and nontoxic ignition agent; {circumflex over (2)} in a formula of a fire-leading coal (10), a total volatile content is up to 30%-40%-50% to facilitate quick energizing after ignition and forming a continuous long-flame combustion; both of an ignition point and a particle size of each component of a combustible substance must be appropriately distributed to facilitate sequential and orderly combustion; after partially emulsified with KOH, a lignite humic acid and a carboxylic acid with a large molecular weight in other raw materials, together with a plant fuel alkalized by an alkaline substance such as KOH and Ca(OH).sub.2, constitute a cheap organic binder to facilitate moderately reducing an ash content and increasing a calorific value and a mechanical strength; the raw material is not added with a toxic and harmful substance, there is less slag which is slightly loose to facilitate automatically falling, the slag contains a fertilizer element such as potassium, calcium, magnesium, silicon and sulfur and is slightly alkaline, and when used in combination with a grass fertilizer, it is suitable for improving a granular structure and fertility of an acid clay and may also be used as a cement additive; {circumflex over (3)} both of a top half part of a matched novel furnace core (2) and a novel fire-gathering plate (6) are modularly produced from a light-colored material that has both a dominated thermal insulation property and a fire resistant property, so as to facilitate forming a high-temperature zone in a large combustion chamber (7) soon after ignition, to facilitate horizontally stacking any number of composition units of coal briquettes in various kinds of hearths, and to facilitate promptly assembling the furnace cores in any shape and dimension on site when the hearth is reconstructed; {circumflex over (4)} the cross-sectional area of a primary air inlet of the stove and the vent holes of the coal briquette must be 10%-25%-30% larger than that of an anthracite originally burnt; the cross-sectional area of an inner ring vent hole (13) of the coal briquette is 30% or more larger than that of an outer ring vent hole (12) thereof to facilitate ensuring adequate oxygen supply necessary for complete combustion in the case of static combustion without an air blast, an industrial stove should be equipped with a programmed ventilation device to control a flame coming out from the hearth to be in a state of oxidizing flame all the time; {circumflex over (5)} inexpensive nanoscale Fe.sub.2O.sub.3 is added to a coal surface of the raw material as a catalyst of the coal gasification and water-gas shift reaction of the intramolecular and extramolecular moisture in a fixed carbon and the coal briquette in a micropore in a red hot layer and the vent hole in a red hot portion of the coal briquette which are two kind of self-contained coal gasification chambers that act as combustion chambers as well, so as to facilitate prolonging a long-flame combustion period substantially, and expensive ferrocene may not be used to catalyze the combustion of coal; and {circumflex over (6)} the composition unit of coal briquettes placed in the stove at one time is constituted by a coal placed underneath (9), the fire-leading coal (10), an ignition cake (9), a straw charcoal grille (11), and the ignition agent layer consisting of an ignition paste in this order from bottom to top, and any number of the composition units may be horizontally stacked; by means of igniting from the top of a coal briquette pile and combusting downward automatically, an orderly, long-flame, complete and zero-smog combustion throughout the whole process from the moment of the ignition of a solid fuel such as bitumite and lignite may be achieved, a sulfur-fixing rate is high, a heat-generating efficiency is high, a cleanliness of an exhaust gas discharged directly is close to that of natural gas, and the exhaust gas may be discharged directly.

18. The zero-smog combustion technology of claim 17, wherein the number of the carbon atoms included in a mixed low-carbon alcohol of the gel of the ignition paste and the ignition cake (8) is generally 2 to 9, including the cases of using ethanol alone with or without water and using isopropanol alone with or without water (though methanol also has the same igniting effect and may also be included, due to its hypertoxicity, the present disclosure does not advocate methanol being widely used in small and micro-sized stoves); the structural isomerism of a carbon chain is not limited, and the number and the primary or secondary or tertiary attribute of the hydroxyl functional group are not limited; major concern for formulating is that a flash point, an ignition point, a melting point and volatility should have a gradient distribution, therefore, within 2 to 3 minutes after ignition, it is able to produce a sequential combustion, so as to prolong the extremely precious long-flame combustion period of the relatively high-cost ignition agent; a part of the gel melted by heating is concurrently absorbed by the straw charcoal grille (11) in the upper portion and the micropores of the fire-leading coal (10) in the lower portion, and a good situation of three-dimensional combustion and long-flame combustion appears soon, which is very favorable for starting combustion smoothly and reliably in a zero-smog state and forming the high-temperature zone in the large combustion chamber (7).

19. The zero-smog combustion technology according to claim 17, wherein the formula of the ignition cake (8) is as below: a) isopropanol: 46%, b) ethanol: 20%, c) ethanediol: 5%, d) water: 20%, e) calcium stearate: 5%, f) magnesium stearate: 3%, and g) hydrated lime: 1%; the key points of a production process of the ignition cake (8) are as below: to an enamel jacketed stirring reactor, weighed and mixed low-carbon alcohols a, b and c are added; while opening the jacket and starting heating with steam, gelatinizing agents e and f are added gradually, and a proper temperature to safely dissolve the gelatinizing agents ranges from 60 C. to 70 C.; after the gelatinizing agents are fully dissolved, a supplementary curing agent g and a burning rate inhibitor and gelling temperature rate regulator d are added; a sample is taken and the gelling temperature is measured, which should be higher than 40 C.; a material temperature is maintained at 50 C. to 60 C., and a feed liquid is poured into a stainless steel die having a diameter of 100 mm and a height of 150 to 300 mm; after the temperature is lowered to 35 C. or less, the material is demoulded and sliced, generally, a thickness of 4 to 5 mm may be adaptable to the most difficult situation where a briquette fuel has a minimum diameter of 100 mm and one composition unit is stacked [the straw charcoal grille (11) is added additionally for assisting ignition] in the freezing cold season; each single slice is encapsulated with a polyacetate fiber (cellophane) film bag which has the smallest breathability among the common plastic films; each 10 slices are packaged in a polyethylene ultra-thin bag and then packaged in a 5 kg corrugated carton for storage; the highest allowable temperature for storage and transportation is 38 C.; and it should be noted that a feeding pipe and a pipe fitting must be well insulated to prevent condensation and blocking at the time of casting.

20. The zero-smog combustion technology according to claim 17, wherein the formula of the ignition paste is as below: a) isopropanol: 46%, b) ethanol: 20%, c) ethanediol: 5%, d) calcium oleate: 3%, e) magnesium oleate: 1%, f) calcium stearate: 3%, g) magnesium stearate: 1%, and h) water: 21%; the key points of a production process of the ignition paste are as below: in the same reactor as that for producing the ignition cake (8), weighed and mixed low-carbon alcohols a, b and c as well as gelatinization and paste-forming agents d, e, f and g are added at a low stirring speed, and the temperature is raised slowly up to 60 C.; after the paste-forming agents are fully dissolved, a burning rate inhibitor and gelatinization and paste-forming temperature rate regulator h is added gradually; a sample is taken and the gelatinization temperature is measured, and 462 C. is qualified; the mixture is stirred continuously and heating and cooling are alternated; the fluctuation range of the temperature is controlled within 55 C. to 60 C., and the mixture is started to be filled in a polyvinyl chloride collapsible tube, sealed with a screw top, and packaged in a 10 kg corrugated carton for storage; and the highest allowable temperature for storage and transportation is 38 C.

21. The zero-smog combustion technology according to claim 17, wherein the straw charcoal grille (11) is an attachment specially designed for assisting the ignition, reducing an ignition cost and improving an ignition reliability of the small- and micro-sized stove used in freezing cold weather in winter at high and middle latitudes and in regions with an elevation of 2000 meters or more; after the ignition, the straw charcoal grille (11) will soon absorb the melted and burning liquid of the ignition paste or the ignition cake (8) to burn itself red and become a heat insulating layer of the top of the fire-leading coal (10); the straw charcoal grille (11) keeps a red hot state of the coal layer at the top of the fire-leading coal (10) until the long flame regenerates when the long flame of the ignition paste or the ignition cake (8) is shortened and the ignition paste or the ignition cake (8) are about to burn out, and cooling and flameout may happen; a formula and the key points of a production process are as below: to a blender mixer, added are 100 kg of a fully carbonized product of straw, pine, China fir, or the like that all pass through a 10-mesh sieve, 2.8 M or more of a potassium water glass binder with a concentration of 15% to 20% in an amount of 6% of the carbonized product based on the dry base, and 3 kg of hydrated lime powder; after uniformly mixed, the mixture is molded into a shape and then naturally dried in a well-ventilated and simple warehouse-like workshop, and is packaged in a super-thin plastic bag and then packaged in a corrugated carton in two stages for release.

22. The zero-smog combustion technology according to claim 17, wherein the fire-leading coal (10) is an important structural-type coal block necessary for connecting the ignition agent with the coal placed underneath (9); the fire-leading coal (10) mainly takes advantage of the following technical principles and technical measures to design a good occurrence state for each component, so as to facilitate maintaining smooth ignition in a zero-smog and long-flame combustion state at the lowest cost and quickly forming the high-temperature zone in the large combustion chamber (7), which is extremely important for consolidating an orderly, long-flame and sequential combustion and ensuring the red hot coal layer to gradually move downward at a designed speed; to this end, {circumflex over (1)} the formula must be featured in having a high volatile content, and it is suitable that the total volatile content accounts for 30%-40%-50% if a total weight of the volatiles of bitumite and lignite and several other macromolecular organics is counted as the volatile content; {circumflex over (2)} both of the ignition point and the particle size of each fuel component must be properly distributed; {circumflex over (3)} among various fuel components, there must be a proper particle size distribution based on the particle size; {circumflex over (4)} each component itself has a rational particle size distribution, for example, the coke powder all passes through a 80-mesh sieve; bitumite all passes through a 30-mesh sieve, so it naturally includes nanoscale, micron-scale and millimeter-scale particle size distributions; lignite all passes through a 20-mesh sieve, whose particle size distribution is similar to that of bitumite; plastic sheets and particles of waste polyolefin have a particle size of less than 2 mm and also contains small sheets and fine particles; the biomass fuel particles have a particle size of less than 3 mm and carry a large amount of fine power themselves; {circumflex over (5)} after a fuel containing a macromolecular organic acid, such as lignite, is partially saponified with a KOH solution, the biomass fuel particles and hydrated lime are added to be properly boiled to absorb the macromolecular organic acid (partially adsorbed by the pulverized coal) so that the fuel is highly dispersed, which facilitates an orderly combustion at a high temperature and thus effectively avoiding the black smoke produced when a macromolecular organic containing a fused ring is burned, while substantially decreasing the production of 3,4-benzopyrene as a cancerogen; the alkalized biomass fuel particles and a part of the saponified fuels such as lignite together constitute a cheap organic binder for coal briquettes, which is quite beneficial for reducing the ash content, increasing the calorific value of the formula and reducing cost; {circumflex over (6)} the plant fuel particles are combusted firstly and other volatiles and nanoscale carbon are combusted successively, such that there have been a considerable number of micropores as micro-coal gasification reaction chambers (selecting the pigment ferric oxide in which the nanoscale particles account for 10% or more as a catalyst to replace the expensive ferrocene) and combustion chambers of the fixed carbon in the red hot coal layer; a considerable portion of the fixed carbon is gasified, which facilitates prolonging the long-flame combustion period; the fuel gas keeps burning when passing through the vent holes (12, 13) of the red hot coal layer which act as such small combustion chambers and gasification chambers, thereafter, the fuel gas is substantially combusted completely through the large combustion chamber (7), and finally undergoes after combustion in a main torch with a secondary air intake; the four-stage continuous combustion is another guarantee condition for realizing complete combustion; {circumflex over (7)} the number of equivalents of hydrated lime compounded as a sulfur-fixing agent is 3 to 5 times that of the total sulfur content of the fuels, and potassium is added additionally to guarantee a high sulfur-fixing rate, since a portion of calcium will be consumed to bind to silicate instead of fixing sulfur; {circumflex over (8)} a toxic and harmful raw material in which the radioactive element(s) exceeds the standard and lead, cadmium, arsenic, mercury, beryllium, thallium, halogen, or the like is contained is rejected, there is less slag in an amount of 10% to 12% in general, and the slag has a loose structure and may almost fall automatically; these factors are very important for a continuously-operating industrial stove; the slag contains the fertilizer elements such as potassium, calcium, magnesium, iron, silicon and sulfur; the slag is slight alkaline after naturally absorbing oxygen and carbon dioxide for several days without being exposed to the rain, and is suitable as a fertilizer and granular structure improver for acid clay after used in combination with an organic fertilizer, or the slag may be used as a cement additive; a formula, the key points of a production process and a packaging of a product for heating are as below: a cylindrical fire-leading coal (10) having a small diameter of 100 mm is taken as an example, the weight of the ingredient is 200 g for each ingredient on dry base, and a heat of (5000-5300)4.1868 kJ/kg is suitable; the fire-leading coal is divided into upper and lower layers, fed twice, and hydroformed once; the formula is as below: a) pine sawdust: 20 kg (15 kg), b) peanut shell powder: 5 kg (9 kg), c) fallen rosin: 9 kg (4.5 kg), d) lost-wax casted waste wax (containing stearic acid): 9 kg (4.5 kg), e) potassium hydroxide: 3.2 kg (1.6 kg), f) bitumite: 60004.1868 kJ/kg, volatiles: 35%, 18 kg of bitumite which all passes through a 60-mesh sieve, 30 kg of bitumite which all passes through a 25-mesh sieve (the grade of which is identical to the former one, 65.85 kg of bitumite which all passes through a 25-mesh sieve), g) hydrated lime powder: 3.5 kg (5 kg), j. ferric oxide pigment: 0.3 kg (0.35 kg), h) 40% potassium water glass: 5 kg (8 kg), i) water: 40 kg (35 kg); the data in the parentheses is the data of the formula of a lower-layer material of the fire-leading coal (10); the key points of the production process are as below: into an open iron pan with a paddle stirrer, i, h, c and d are added and heated till boiling; debris such as branches, leaves and stones are picked out; a saponification solution is added to a kneading pot added with a and b while filtering; after kneading under thermal insulation for 15 to 20 minutes, f and h to which j and g have already been mixed are added and the kneading is continued for 10 minutes, and then the mixture is conveyed to the 1# hopper of a hydraulic molding machine; this is an upper feedstock of the fire-leading coal (10); another set of the same system is used to prepare a lower feedstock of the fire-leading coal (10), which is conveyed to the 2# hopper of the hydraulic molding machine; the hydraulic molding machine is started and 1# feedstock and 2# feedstock in equivalent amount are conveyed into a molding cylinder in turn while they are hot, compression molded at one time, and transferred to a big large-scale low-temperature ventilation drying room while they are hot; the fire-leading coal (10) is dried at 60 C. until the moisture content is less than 10%, and is moved out together with a rail car to a natural cooling section in the workshop; when the temperature is lowered to 35 C. or less, each fire-leading coal (10) is packaged in an ultra-thin polyethylene plastic bag and then packaged in a corrugated carton for storage; a molding pressure is carefully adjusted according to the variety and specification of the product and subjects to a standard that the mechanical strength of the product is able to adapt to a logistic operation in a non-barbaric state and the product is not easy to break, so as to maintain a proper crispness, which facilitates a rapid temperature rise and the coal gasification reaction of the fixed carbon in an ignition stage.

23. The zero-smog combustion technology according to claim 17, wherein the high-temperature zone above the coal placed underneath (9) has been already formed, and is easy to be smoothly ignited; the flexibility of the formula is large, but it is still necessary to pay attention to a reasonable occurrence state of the components and a gradient principle to guarantee a good state of a sequential combustion; the focus of some formulas has turned to the use of low-cost raw materials and a product is supplied to the scattered residents in villages at a lower unit price and used for heating; a formula and the key points of a production process of a product for heating are as below: calorific value: 40004.1868 kJ/kg, volatiles: 40%, a) straw pieces: 10%, b) pine sawdust: 10%, c) 20% of potassium water glass: 8%, d) bitumite powder (55004.1868 kJ/kg, volatiles: 30%, sulfur: 2.5% or less): 68%, e) hydrated lime powder (in term of equivalent): 3 times of sulfur equivalent, f) ferric oxide pigment: 0.5%, g) plastic pieces of polyolefin waste: 5%, and i) water: 5%; d with a fineness of 25 mesh and the moderately-sized a, b and g are weighed, put into a mixer, and mixed for about 10 minutes; thereafter, the pre-mixed e and f that are 10 times of the weight of d, a and b are added and the mixture is mixed continuously for several minutes; a binder c is sprayed and the mixture is mixed for another several minutes; the mixture is moved into a hopper of a hydraulic molding machine, molded with a large pressure, stored and dried naturally; when entering the stove, containing 10% to 15% of moisture is quite advantageous to the coal gasification reaction of the fixed carbon.

24. The zero-smog combustion technology according to claim 17, wherein the coal briquette fuel, the vent hole, a hole diameter and an arrangement are rational; regardless of whether the coal briquettes are made into a cylindrical or square column and regardless of their geometric sizes, all the coal briquettes adopt circular and straight vent holes, and a total cross-sectional area of the vent holes is 10%-20%-30% larger than that of a commercially available anthracite (which is called honeycomb briquette in the south), so as to adapt to the requirements for large oxygen consumption necessary for fast combustion of the volatiles with a high content in the solid fuel; the diameters of several vent holes (13) in a central part of the briquette need to be extraordinarily enlarged so that they are 2 to 3 mm larger than those of the peripheral vent hole (12), to enable the big torch flame beam from a primary hole in the center of the fire-gathering plate (6) to further get fresh air in an amount similar to that obtained through a peripheral secondary air inlet hole (4) in the furnace core (2); when a plurality of composition units are horizontally stacked in a large hearth, the distance between the composition units in the central part is 2 to 3 mm larger than that between peripheral units for the same purpose of getting adequate amount of fresh air; the area of a primary air inlet and soot door (5) at the lower portion of the stove should be suitably 5% to 20% larger than a sum of the total area of the vent holes of the briquettes and the total area of gaps around the briquettes; the more the composition units are, the closer the value is to 20%; making the above three improvements which increase the oxygen supply is quite essential, in this way, complete combustion may be guaranteed without providing an air blast or heightening a chimney.

25. The zero-smog combustion technology according to claim 17, wherein a space is present with sufficient size (whose volume is not less than that of one piece of coal placed underneath (9)) above the furnace core (2), and the furnace core (2) is covered with the fire-gathering plate (6) to form a simple large combustion chamber (7); in case that a formula has an extremely high volatile content and a coal gasification rate of the fixed carbon is also high, the height of the large combustion chamber (7) needs to be properly increased; the height of the combustion chamber plus the height of the furnace core (2) corresponding to the height of the fire-leading coal (10), should be made from an material that has both a dominated thermal insulation property and a fire resistant property, is alkaline on the whole, and has a high content of magnesium and a low content of transition element(s); a material of the furnace core of a conventional stove is selected only by considering the fire resistance, which is quite unfavorable for a crucial design of a smooth ignition in a zero-smog state in a small-sized heating stove in freezing cold weather in winter and an early formation of the high-temperature zone in the large combustion chamber (7); coal briquettes formulated according to a sulfur-fixing formula are strong alkaline and are liable to be welded to an acidic furnace core at a high temperature; the low content of the transition element(s) (coloring element(s)) is able to make the furnace core (2) light-colored and good for light and heat reflection, which is advantageous for rapid temperature rise after ignition; it is preferred that the fire-gathering plate (6) has a thin thickness and a light weight; preferably, the material is the same as the thermal insulation-fire resistance material for the upper portion of the furnace core (2), and more preferably and most preferably, the color of the fire-gathering plate (6) is nearly white; the periphery of the fire-gathering plate (6) is preferably embedded with a circle of stainless steel strip or cheap steel strip with good sulfur resistance to reinforce it; in short, the fire-gathering plate (6) is better when it absorbs less heat and its inner arc-shaped surface reflects more light and heat downwards; as for industrial and cooking stoves requiring great heat power and high operating temperature, and stoves used for coal briquettes having the minimum diameter (often 100 mm), single composition unit and ignition in a freezing cold season, the fire-leading coal (10) having a high calorific value and capable of fast burning which is used in combination with the furnace core (2) and the fire-gathering plate (6) having such high performance is required; as for stoves for heating, baking, drying, and boiling hot water in a region with lower latitude, the low-cost fire-leading coal (10) may be chosen to be used in combination with the furnace core (2) and the fire-gathering plate (6); a stacking manner of the coal briquettes of the present disclosure is as follows; each combustion unit which is placed in the hearth (2) for combustion comprises one straw charcoal grille (11) and one ignition cake (8), one piece of fire-leading coal (10), and one to three pieces of coal placed underneath (9) in turn from top to down; if the ignition paste is used, the ignition paste is temporarily squeezed on the top of the fire-leading coal (10) before ignition and then ignited immediately after the coal placed underneath (9) and the fire-leading coal (10) are placed inside; a plurality of composition units may be horizontally stacked arbitrarily and ignited as necessary, and this naturally needs to fit the hearth, the furnace core (2), the fire grate (15) and the fire-gathering plate (6); when a plurality of composition units are employed in a large hearth, since many hands make light work, a using amount of the ignition agent is less, i.e., the cost may be reduced appropriately, the temperature rises rapidly, and the beneficial effect is remarkable.

26. The formulas and production processes exemplified in the specific embodiments are merely for further illustrating the content of the present disclosure, but are not limited thereto, and the embodiments are all included in the scope of the present disclosure as long as they adopt the following technical contents in the briquette fuels for upper ignition-downward combustion: 1. a gel paste or cake (8) of low-carbon alcohols is used as an ignition agent, and a straw charcoal and other plant charcoals are used as auxiliary ignition agents, regardless of how a formula, a production process and a packaging form are adjusted; 2. a formula and a molding process of a fire-leading coal (10), as long as a) an ingredient having a high volatile content of 30%-40%-50% is adopted, b) both of the ignition point and particle size of each fuel component are arranged in gradient to facilitate an orderly and sequential combustion, and c) after lignite and other materials containing a macromolecular organic acid are partially emulsified (neutralization reaction with potassium hydroxide and the like), the mixture and a plant fuel boiled with an alkaline substance such as potassium hydroxide, hydrated lime and plant ash together constitute a fuel and binder, so as to save the cost of the binder, regardless of how the formula, the production process and the packaging form are adjusted; 3. commercial iron sesquioxide containing at least 10% or more of iron sesquioxide and having a particle size of 50 nm or less is adopted to catalyze a part of a fixed carbon in a coal component to be gasified in a micropore and a vent hole in a red hot coal layer before combustion, so as to facilitate the extension of a long-flame combustion period; 4. a furnace core (2) has a height of at least from the bottom of the fire-leading coal (10) to the bottom of a fire-gathering plate (6), and the fire-gathering plate (6) itself is made from a light alkaline fire-resistant material having good thermal insulation property and containing a high content of magnesium and a low content of transition element(s); 5. a total area of an air inlet of a stove and the vent holes of the coal briquettes is enlarged by 10-20-30%, as compared to that of an anthracite originally used, and the diameter of an inner ring vent hole (13) is 10% to 11% larger than that of an outer ring vent hole (12); 6. after tests, a raw material does not contain radioactive elements beyond standard, does not contain lead, cadmium, arsenic, mercury, thallium, and beryllium, and does not contain halogen, much sulfur and nitrogen and other toxic and harmful substances, so the burnt slag mainly contains elements such as potassium, calcium, magnesium, iron, silicon and sulfur, thus being used as a fertilizer or a cement additive; and 7. various combustible solids and semi-solids, including a low-value waste thereof, may all be used as a formulated fuel according to the methods described in the present specification to realize highly efficient and clean combustion, and are thus included in the content of the present disclosure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0112] FIG. 1: A section view of the vertical face of the stove of the present disclosure;

[0113] FIG. 2: A top view and an A-A section view of the composite of the ignition cake and the straw charcoal grille used in combination in the present disclosure.

DESCRIPTION OF REFERENCE SIGNS

[0114] 1. Furnace wall

[0115] 2. Furnace core

[0116] 3. Heat insulating layer

[0117] 4. Secondary air inlet hose

[0118] 5. Primary air inlet and soot door

[0119] 6. Fire-gathering plate

[0120] 7. Large combustion chamber

[0121] 8. Ignition cake

[0122] 9. Coal placed underneath

[0123] 10. Fire-loading coal

[0124] 11. Straw charcoal grille

[0125] 12. Outer ring vent hole

[0126] 13. Inner ring vent hole

[0127] 14. Cross channel for flame on straw charcoal grille

[0128] 15. Cast-iron fire grate

DETAILED DESCRIPTION

[0129] (1) Technical problem to be solved by the present disclosure is as follows. Without fuels for compulsory heating, users may continue to use all sorts of medium-, small- and micro-sized stoves, and various combustible solids or semi-solids, e.g., bitumite, lignite, plant fuels, waste plastics such as polyolefin, wastes front coal and petrochemical enterprises and so on may be stacked inside only by slight reconstruction. The combustible solids or semi-solids are formulated with excipients elaborately and molded to columnar fuel briquettes with honeycomb-like vent holes. By means of upper ignition-downward combustion, a combustion which is static, orderly, long-flame, complete and zero-smog (throughout the whole combustion process from the moment of the ignition) is realized without an air blast or heightening the chimney, a high heat-generating efficiency and a high sulfur-fixing rate are achieved, and the cleanliness of the exhaust gas is close to that from natural gas and may be discharged directly without purification treatment (the exhaust gas of those formulated with rubber fire powder should not be discharged until being desulfurized and denitrated since the contents of sulfur and nitrogen are too high), that is, controlling the generation and emission of the toxic and harmful pollutants during a short combustion period.

[0130] (2) Solution to the technical problem of the present disclosure is as follows. The technical problem described in paragraph [001] is solved by integrating the following two well-known technologies and five innovative technical measures, which are described in detail in the following paragraphs [003] to [004], and paragraphs [005] to [0052], respectively.

[0131] Integrated well-known technology I: The combustion manner of upper ignition-downward combustion may form a coal briquette pile and a hearth temperature distribution in which the high-temperature zone is in the upper portion and the low-temperature zone is in the lower portion, so that the red hot coal layer instantly formed at the top of the fire-leading coal (10) is able to gradually move down at a designed speed since the radiant heat produced by the flame from the large combustion chamber (7) plus the conductive heat produced by the internal temperature difference within the coal body is higher than the convective heat taken away by the rising of cold air. In this way, at every differential time interval, only the secondary high temperature layer (or referred to as prospective red hot layer) right adjacent to the upper red hot coal layer generates a micro amount of thermal volatilization, thermal cracking, and thermal disintegration as well as the thermal decomposition and oxidation of compounds containing sulfur and nitrogen, which provides a significant condition for effectively avoiding the occurrence of the terrible situation where the manners such as downward ignition enable these combustible volatiles and pollutants containing sulfur and nitrogen elements to rush out so intensively that they have no time to be completely combusted and have no time to be absorbed by a Strong alkaline sulfur-fixing agent to transform into sulfate in solid form preserved in the coal briquette pile or slag, thereby inevitably producing black brown smog. Integrated well-known technology II: The matched stoves for briquette fuels must be provided with a secondary air inlet hose (4) and the space at the top of the coal pile must be covered with a fire-gathering plate (6) to form a simple combustion chamber. The secondary air inlet hose (4) is below the stove and the air inlet hose is adhered to the external wall of the furnace core (2), which is beneficial to the preheating of air and may improve the adaptability to the formula with a high content of volatiles. Blue flame generated by the combustion enhanced by the airflow ejected via the secondary air inlet (4) is often observed to be combusted brightly during the temperature-rising stage after ignition, which is sufficient to prove the effect.

[0132] People have usually ignited fuels such as wood and straw from the bottom since lime immemorial. In this way, the fire is heating up rapidly, but the smoke is heavy. People sometimes ignite the stacked solid fuels from the top and sides thereof, and the stacked solid fuels may be burned downward and inward slowly but producing less smoke, which is a familiar common sense of life that has been known to humans long before. The scientific principle thereof is that the radiant heat of the flame generated by combustion and the conductive heat generated by the heating of the fuels themselves may be equivalently spread in a 360-degree space without being affected by gravity. Therefore, the upper ignition-downward combustion mode has been a well-known technology since ancient times. The content described in paragraph [001] further explains that it is a well-known technology.

[0133] The innovative technical measures of the present disclosure are illustrated with 47 paragraphs, i.e., from paragraph [005] to paragraph [0052], and they are the vent holes and the more rational hole size and arrangement. Regardless of whether the coal briquettes are made into a cylindrical or square column and regardless of their geometric sizes, all of the coal briquettes adopt circular vent holes. The total cross-sectional area of the vent holes is 10% or more (depending on factors such as the product usage and the composition of the main raw material, the highest value may be up to 25% or the value is slightly higher and is up to 30%) larger than that of the commercially available anthracites (which are called honeycomb briquettes in the south), so as to adapt to the requirements for large oxygen consumption necessary for fast combustion of the volatiles with a high content in the fire-leading coal (10) of the present disclosure. Current cylindrical briquette having a diameter of 100 mm and having honeycomb-like vent holes is taken as an example. The diameters of several vent holes (13) in the central part of the briquette need to be extraordinarily enlarged so that they are 2 to 3 mm larger than those of the peripheral vent holes (12), to enable the big torch flame beam from the primary hole in the center of the fire-gathering plate (6) to further get fresh air in an amount similar to that obtained through the holes of the peripheral secondary air inlet hose (4) in the furnace core (2). When a plurality of composition units are horizontally stacked in a large hearth, the distance between the composition units in the central part is 2 to 3 mm larger than that between the peripheral units, which allows the central part of the coal briquette pile to get a secondary air intake amount similar to that of the peripheral part and provides another guarantee measure to enable the big torch fame from the primary* hole in the center of the above-mentioned fire-gathering plate (6) to get adequate amount of fresh air. The cross-sectional area of the air inlet (4) at the lower portion of the stove should be suitably 5% to 20% larger than the total cross-sectional area of the internal and external vent holes of the coal briquette pile, and the more the composition units are, the closer the value is to 20%. It is suitable that industrial stoves are equipped with automatic air volume control devices for the primary air inlet (5) and the secondary air inlet to ensure that the flame coming out of the stove is in the form of oxidizing flame all the time, which is a very important control measure for complete combustion. Operators of simple stoves may also skillfully control the air intake amount to a preferable status based on experience. At the end stage of each combustion, namely, at the end of the long-flame combustion, the secondary air inlet nozzle (4) may be closed to avoid the secondary action of cooling in the stove. Making the above four improvements which increase the oxygen supply is quite essential, in this way, complete combustion may be guaranteed without an air blast or heightening a chimney.

[0134] Large combustion chamber (7); There needs to be a space with sufficient size (whose volume is not less than that of one piece of coal placed underneath (9)) above the furnace core (2), and the furnace core (2) is covered with the fire-gathering plate (6) to form a simple large combustion chamber (7). In case that the formula has an extremely high volatile content and the coal gasification rate of the fixed carbon is also high, the height of the large combustion chamber (7) needs to be properly increased. The height of the combustion chamber plus the height of the furnace core (2) corresponding to Die height of the fire-leading coal (10) should be made from an material that has both a dominated thermal insulation property and a fire resistant property, is alkaline on the whole, and has a high content of magnesium and a low-content of transition element(s). This is because the material is selected only by considering the fire resistance as with the case of the conventional stoves, which is quite unfavorable for the crucial design of the smooth ignition in a zero-smog state in a small-sized heating stove in freezing cold weather in winter and the early formation of the high-temperature zone in the large combustion chamber (7). Coal briquettes formulated according to a sulfur-fixing formula are strong alkaline and are liable to be welded to an acidic furnace core at a high temperature. The low content of the transition element(s) (coloring element(s)) is able to make the furnace core light in color and good for light and heat reflection, which is advantageous for rapid temperature rise after ignition.

[0135] Fire-gathering plate (6): It is preferred that the fire-gathering plate (6) has a thin thickness and a light weight. Preferably, the material is the same as the thermal insulation-fire resistance material for the upper portion of the furnace core (2), and more preferably and most preferably, the color of the furnace core is nearly white. The periphery of the fire-gathering plate (6) is preferably embedded with a circle of stainless steel strip or cheap steel strip with good sulfur resistance to reinforce it. In short, the fire-gathering plate (6) is better, when it absorbs less heat and its inner arc-shaped surface reflects more light and heat downwards. As for industrial and cooking stoves requiring great heat power and high operating temperature, and stoves used for coal briquettes having the minimum diameter (often 100 mm), single composition unit and ignition in the freezing cold season, the fire-leading coal (10) having a high calorific value and capable of fast burning used in combination with the furnace core (2) and the fire-gathering plate (6) having such high performance is required. As for stoves for heating, baking, drying, and boiling hot water in a region with low latitude, low-cost fire-leading coal (10) may be chosen to be used in combination with the furnace core (2) and the fire-gathering plate (6).

[0136] Composition and structure of coal briquette pile: The stacking manner of the coal briquettes of the present disclosure is as below. From top to down, each combustion unit which is placed in the hearth and to be combusted comprises the following substances in turn: one straw charcoal grille (11) and one ignition cake (8), one piece of fire-leading coal (10), and one to three pieces of coal placed underneath (9). If the ignition paste is used, after the coal placed underneath (9) and the fire-leading coal (10) are placed inside, the ignition paste is temporarily squeezed on the top of the fire-leading coal (10) before ignition and then ignited immediately. If necessary, a plurality of composition units may be horizontally stacked arbitrarily for ignition, and this naturally needs to fit the hearth, the furnace core (2), the fire grate (15) and the fire-gathering plate (6). When a plurality of composition units are employed in a large hearth, since many hands make light work, the using amount of the ignition agent is less, i.e., the cost may be reduced appropriately, the temperature rises rapidly, and the beneficial effect is remarkable.

[0137] Ignition paste and ignition cake (8): A combination of the ignition paste and the ignition cake which is used in combination with the fire-leading coal (10) is able to form the high-temperature zone in the large combustion chamber (7) after ignition rapidly, which is the most important core technology of the present disclosure, wherein the unsafe and high-cost oxidant that discharges highly toxic smog firstly when ignited is replaced with a solid or semi-solid non-toxic ignition agent which is relatively safe. In addition, several improved technical measures including the stove, the furnace core, the fine-gathering plate, the secondary air supply, the cross-sectional area and arrangement of the vent holes of the coal briquettes, and ways of stacking and placing the coal briquettes finally succeed in realizing zero smog, low content of carbon monoxide, low content of volatile organic, low content of oxysulfide and low emission of smoke dust throughout the w hole combustion process from the moment of ignition, such that the combustible solids and semi-solids finally achieve a cleanliness of the exhaust gas close to that of natural gas. Besides, the slag is less in amount, loose and easy to fall, and is neither toxic nor harmful, which may be used as a fertilizer and granular structure improver for acid clay or a cement additive.

[0138] The ignition paste is more suitable for stoves with more composition units, and the ignition cake (8) is suitable for stoves with 1 to 4 combination units, but the ignition paste and the ignition cake have no clear technical specification of use and are selected by the consumers voluntarily. Thin ignition cakes break easily, especially for those with large diameters, and it is thus slightly inconvenient. However, it may still be used after the fracture and has little influence on the ignition effect. It should be noted that more extrusion amount of the paste product is not always belter, and the ignition cost may be saved after skillful at using it.

[0139] Selecting a mixed low-carbon alcohol gel as the ignition paste and ignition cake (8) to replace the expensive oxidant which emits toxic smoke when ignited enables the correct technical idea, namely, upper ignition-downward combustion of the briquette solid fuels, to possess all of novelty, advancement and utility, thus being able to be put into practice. Here, concerns are that the cost is slightly lower in comparison to using single ethanol and the mixed alcohol may form sequential combustion so as to extend the precious combustion time of the ignition agent. The third concern, which is also the biggest technical secret of the ignition agent, is as below. After being ignited, the gel melts rapidly due to heating; there are a large number of micropores in the fire-leading coal (10) on one hand, and the surface of the solid particles thereof is made to have both hydrophilicity and lipophilicity on the other hand, which is identical to the selected alcohols, and the case of the straw charcoal grille (11) placed above the ignition cake (8) is also similar. Therefore, for all these reasons, so the upper and lower sides of the ignited ignition cake (8) are capable of rapidly absorbing the burning gel liquid and a good situation of three-dimension combustion and long-flame combustion appears soon, which is very favorable for forming the high-temperature zone in the large combustion chamber (7). This has been repeatedly confirmed by the phenomena and the ignition effects observed by the inventors in numerous ignition tests and demonstrations.

[0140] The mixed low-carbon alcohols indicated in the present disclosure generally include alcohols having 2 to 9 carbon atoms, and are not limited to the structural isomerism of the carbon chain and the number and isomerism of the alcohol hydroxyl functional groups. Situations of using mere ethanol with or without water and using mere isopropanol with or without water are also included. Though methanol has similar technical effects and lower cost and may also be included, however, due to its hypertoxicity, the present disclosure does not advocate its wide use in small-sized stoves, and methanol is suitable for industrial stoves in facilities and plants with good management condition. The flash point, the ignition point, the melting point and volatility are mainly considered at the time of formulating, each of which should have a gradient in hope of being capable of producing a sequential combustion within 2 to 3 minutes after ignition to prolong the extremely precious long-flame combustion period of the ignition agent. When producing the gels, the difference between the lowest temperature to dissolve the gelatinizing agent safely and the temperature of paste formation and gelatinization should be greater than 20 C., preferably 30 C. to facilitate casting operation. The highest temperature is generally controlled at 60 C. to 70 C. to facilitate fire safety. When the air temperature is high and fluctuates greatly during the storage period of the ignition cake (8), a small amount of irreversible liquid alcohols are volatilized and precipitated from the gel, therefore, the ignition cake (8) should be stored in a warehouse which is dark, cool and ventilated. Material cost is low.

[0141] Straw charcoal grille (11): It is an attachment specially designed for assisting the ignition, reducing the ignition cost and improving the ignition reliability of small- and micro-sized stoves used in freezing cold weather in winter at high and middle latitudes and in regions with an elevation of 2000 meters or more. After the ignition, the straw charcoal grille (11) will burn itself red soon and become a heat insulating layer of the fire-leading coal (10). In the case of encountering freezing cold weather, the straw charcoal grille (11) keeps the flame in the high-temperature zone in the upper portion of the fire-leading coal (10) not excessively being shortened and the long flame will resurrect later when the ignition cake (8) is about to burn out the long flame is be shortened, cooling and flameout may happen, and a crisis appears. The flame contains a part of plasmas and carries more energy, which is very beneficial for generating strong radiation in the high-temperature zone of the hearth. Therefore, maintaining the long-flame combustion is an extremely important condition for the upper ignition-downward combustion state to be formed quickly and proceed continuously. The straw charcoal grille (11) may also be used in combination with an ignition paste.

[0142] The ignition cake (8) and the straw charcoal grille (11) are combined into one, which is more convenient to use. As one variety of the serial ignition agents of the present disclosure, it has been successfully developed and is very user-friendly. Please pay attention to later patent applications of the inventors and the applicant of the present disclosure. However, when the variety is produced, it may only be hot cast in a single piece. When the variety is produced in a region with slightly higher altitude in winter, the volatilization loss of alcohols is small and the fire safety issues in the workshop are not big either, therefore, it is convenient. Under other conditions, the investment in fire protection equipment and environmental protection equipment is slightly larger and the production is also feasible.

[0143] When the ignition cake (8) is produced, the raw material is first cast into a long column shape, and after cooling and demolding, each long cylindrical gel rod may be sliced at one time. The volatilization loss of alcohols is small, and the fire-protection pressure is also small. In non-freezing weather, in the case of igniting many composition units in a warm stove, the straw charcoal grille (11) may not be added and a 4 mm slice may be used alone. The ignition cost is not high and it is convenient.

[0144] Expensive alcohols encapsulated with -cyclodextrin are not selected and used as the raw materials for the ignition agent. The main considerations are that the gel is capable of producing the ignition effect of the aforementioned three-dimensional combustion effect, and secondly, the cost of the gel is low.

[0145] In short, customers may flexibly use the three parts of the ignition agent, that is, the ignition cake (8), the ignition paste and the straw charcoal grille (11) as appropriate and at will.

[0146] The binary design of the ignition agent and the fire-leading coal (10) and the separate transportation and storage are advantageous for reducing fire-protection pressure, which is very important. Current commercially-available fire-leading coal (for use in igniting common anthracites from the bottom; it produces a large amount of black smoke upon ignition and must be ignited outdoors) which may be ignited by a single match is a flammable product, which is very dangerous to be stored in large pile. The fire-leading coal (10) of the present disclosure cannot be easily ignited by a single match or a lighter, and is only a combustible product. Although the ignition paste and the ignition cake are flammable products, the volume and weight thereof are generally only 10% to 15% or less of those of the fire-leading coal (10). They are placed in a packing box or case, and are easy to be transported and stored safely. In addition, the fire-leading coal (10) needs to be dried by heating, while the ignition agent is neither necessary nor allowed to be dried by healing.

[0147] As for the formulas, production processes and packing methods of the ignition paste, the ignition cake (8) and the upper-mounted straw charcoal grille (11) placed above, please refer to the specific embodiments (1), (2) and (3) in Part V.

[0148] f. Fire-leading coal (10): It is an important structural-type coal block necessary for connecting the ignition paste/cake (8) with the coal placed underneath (9), anti the heat released from the fire-leading coal is mainly relied on to form the high-temperature zone in the large combustion chamber (7) at the top of the coal briquette pile and smoothly and steadily ignite the coal placed underneath (9). Therefore, the fire-leading coal is required to certainly reach an orderly, complete and long-flame combustion firstly in the process of rapid combustion and temperature rising, so as to allow the red hot coal layer to gradually move down at a designed speed, thereby not producing black smoke and rarely emitting gas containing suffocating foul smell and strong irritating smell of sulfur dioxide which are produced when bitumite is combusted in conventional ways during the whole combustion process of the coal briquettes.

[0149] In order to realize an orderly, complete and long-flame combustion, in the present disclosure, the technical principle and technical measures employed in preparing the fire-leading coal (10) and the coal placed underneath (9) are as follows.

[0150] 1. The ignition points of respective fuel components have a proper gradient from low to high, the above-mentioned fuel components are a plant fuel, fallen rosin, industrial waste wax, lost-wax casted waste wax (containing stearic acid), waste polyolefin plastics, lignite, bitumite, coal slime, . . . coke powder in turn.

[0151] 2. The respective fuel components must have a proper panicle size distribution according to fineness.

[0152] 3. Each component itself has a rational particle size distribution. For instance, bitumite ail passes through a 30-mesh sieve, and particle size distributions in nanoscale, micron-scale and millimeter-scale arc naturally included; lignite all passes through a 20-mesh sieve, and its particle size distribution is similar to that of bitumite; the sheet of waste polyolefin plastics has a particle size of less than 2 mm and contains a few fine particles; the plant fuel particles have a particle size of less than 3 mm, and they carry a large number of fine power themselves.

[0153] 4. Lignite, fallen rosin, lost-wax casted waste wax, and other industrial waste waxes are reasonably formulated and used. After using a KOH solution to neutralize a part of the macromolecular organic acids to form an emulsion, the plant fuel particles are then added to be properly boiled. The macromolecular organic acids are mainly adsorbed by the plant fuel particles and partially adsorbed by the fine pulverized coal so that they are highly dispersed, which facilitates an orderly combustion and thus effectively avoiding the black smoke produced when a macromolecular organic containing a fused ring is burned, while substantially decreasing the production of 3,4-benzopyrene as a cancerogen. Additionally, the plant fuel particles boiled in a KOH alkaline solution, together with the emulsified rosin, waxes and a lignite binder, become a cheap organic binder of pulverized coal and other excipient powder that is self-produced by the way in the production process, which is beneficial for reducing the ash content, increasing the calorific value of the formula and maintaining the mechanical strength of the coal briquettes.

[0154] 5. In addition to the occurrence stales of the raw materials described in paragraphs [0022], [0023], [0024] and [0025], the formula of the fire-leading coal (10) must be featured in a high volatile content, which is a technical measure necessary for keeping long-flame combustion for most of the time. In the instant specification, the volatile content of bitumite and lignite plus the total weight of the macromolecular organics contained in the plant fuels and the like are counted into the total volatile content. According to different uses of the product, the total volatile content thereof is suitably maintained as at least 30% or more, generally 40%, and 50% if particularly required. However, too high volatile content may cause the ash content to be excessively low, and the fire-leading coal is liable to collapse in the midway of combustion, thus blocking the vent holes. In addition, it is favorable for the coal placed underneath (9) to be smoothly ignited when it contains a moderate proportion of the plant fuels.

[0155] 6. The plant fuel particles are combusted firstly and other volatiles and nanoscale carbon are combusted successively, such that there have been a considerable number of micropores as micro-coal gasification reaction chambers of the fixed carbon and coal gas combustion chambers in the red hot coal layer, and the amount of gasification and combustion is increased, which facilitates prolonging the long-flame combustion period. The fuel gas keeps burning when passing through the vent holes (12, 13) of the red hot coal layer which act as small combustion chambers, thereafter, the fuel gas is substantially combusted completely through the large combustion chamber (7), and finally undergoes after combustion in the main torch with a secondary and a third air intake. The four-stage continuous combustion is another guarantee condition for realizing complete combustion.

[0156] A cylindrical fire-leading coal (10) having a diameter of 100 mm is taken as an example. Ingredient: dry base: 200 g for each; and a heat of (5000-5300)4.1868 kJ/kg is suitable; the fire-leading coal is divided into upper and lower layers and it is suitable for the fire-leading coal to be fed twice and hydroformed once. As for the formula, the production process and the packing method of a product for heating, please refer to the specific embodiment (4) in Part V.

[0157] f. Coal placed underneath (9): It is the main coal briquette which provides most of the calorific value, and the cost is lower than those of the ignition agent and the fire-leading coal (10). In addition to the concerns that the compounding ingredient is capable of being smoothly ignited by the fire-leading coal (10) and maintaining the long-flame combustion, the key point of the compounding ingredient that it should be compounded with flexible raw materials which are low-cost/unit calorific value and may purchased nearby, such as coke powders, lignite, plant fuels, waste plastics, peals as well as low-cost materials and wastes from coal and petrochemical industries, except for bitumite. In terms of stoves used for warming, heating, boiling water and baking for industrial enterprises such as livestock farms and scattered residents, since the original hearth for burning scattered bitumite and plant fuels is large and many composition units may be accommodated, the demand for the calorific value is not necessarily high, but a low cost is desirable; and in this case, the formula may be designed in accordance with the following standard: (3800-4000)4.1868 kJ/kg. If a strong heat power is demanded, the formula may be designed as 5000*4.1868 kJ/kg or more.

[0158] The molding pressure of the coal placed underneath (9) is large, and an inorganic binder may be added alone without drying before release. The coal briquettes preferably maintain 10% to 15% moisture prior to the entry into stoves, which may increase the gasification rates of of the fixed carbon. As for the formula and the production process, please refer to the specific embodiment (5) in Part V.

[0159] The mixed low-carbon alcohol ignition agent, the elaborate formula and production process of the coal briquettes in combination with the novel stove, furnace core and fire-gathering plate and a secondary or even a third air inlet structure as well as the combustion manner wherein the high-temperature zone is in the upper portion and the low-temperature zone is in the lower portion which is formed by upper ignition-downward combustion together constitute the sufficient and necessary conditions of an orderly, long-flame and complete combustion, and finally realize the effects of zero-smog emission in the whole combustion process and a high sulfur-fixing rate.

[0160] (3) The beneficial effects of the present disclosure w ill be further described in detail as follows: {circumflex over (1)} Since a zero-smog, orderly and long-flame combustion starts from the moment of ignition at the top of the vertical composition units of a mixed low-carbon alcohol gel ignition agent, the fire-leading coal (10) and the coal placed underneath (9) which are placed in the furnace core of a specialized stove, so the high-temperature zone is firstly formed in the large combustion chamber (7) at the top of the coal briquette pile. Since continuous and stable long-flame combustion may be formed soon after the ignition, the radiant heat and the conductive heat absorbed by the red hot coal layer on the surface of the fire-leading coal (10) is greater than the convective heat taken away by the rising of cold air and thus the red hot coal layer is allowed to move down rapidly. Due to the elaborate design of the ingredients in the formula and the occurrence state of the fire-leading coal (10), at any differential time interval, only the coal layer right adjacent to the lower end of the red hot coal layer reaches the secondary high temperature and differentially releases volatiles and generates flammable products from thermal decomposition, thermal cracking and thermal disintegration, all of which gradually enter the micropores in the red hot coal layer for preliminary combustion, and then enter into the red hot vent holes to be combusted continuously. The fuel gas is substantially combusted completely after reaching the large combustion chamber (7), and finally bunt out with the aid of the supplementary air intake brought by the inner ring vent hole (13) in the primary torch in the center of the fire-gathering plate (6), that is, an orderly sequential combustion is realized reliably and the bad state in which the exhaust gas unable to be completely combusted in a scattered state is discharged intensively is completely eradicated, so it appears as zero-smog combustion in the whole process and the heat-generating efficiency is certainly very high. Moreover, fortunately, based on the same mechanism of orderly combustion, the coal-based sulfur in the coal is orderly oxidized after being heated and becomes SO.sub.2 and SO.sub.3, and undergoes acid-base neutralization reaction to become the sulfates and sulfites of potassium/calcium/magnesium/iron while most of the sulfates and sulfites are fixed in the slag, so the sulfur-fixing rate is also quite high during the combustion process. Only the nitrogen-fixing rate is limited since neutralizing nitric oxide with hydrated lime and potassium carbonate to form calcium nitrate and potassium nitrate is a reversible reaction within a high temperature range of 600 C. to 900 C. in the hearth, but the cleanliness of the exhaust gas is already close to that of the exhaust gas emitted from the combustion of natural gas.

[0161] {circumflex over (2)} In the numerous micropores inside the red hot coal layer, a considerable amount of the fixed carbon is gasified through a water-gas shift reaction with the intramolecular and extramolecular moisture in the coal briquettes under the catalysis of the cheap nanoscale iron sesquioxide particles added to the mixture, which greatly increases the long-flame combustion period. Hence, expensive ferrocene may not be used to catalyze the combustion of fuels such as bitumite.

[0162] {circumflex over (3)} Since the ignition agent and the fire-leading coal (10) of the present disclosure work in close coordination and have achieved a remarkable ignition effect, formulas comprising toxic and dangerous oxidants are absolutely abandoned, namely, not using nitrate. chlorate, perchlorate, manganate, permanganate, manganese dioxide, inorganic-organic peroxides, nitro-compounds, nitrocellulose, etc. The formula of the present disclosure also strictly rejects the use of a raw material containing heavy metal element(s) such as lead, cadmium, arsenic, mercury, and thallium and a raw material in which the radioactivity is out of standard, and strictly rejects the use of the toxic and harmful raw materials containing bismuth, halogen, or the like.

[0163] {circumflex over (4)} There is less slag in an amount of 10% to 12% in general, and the slag has a loose structure and may almost fall automatically, which is very important for a continuously-operating industrial stove. The slag contains fertilizer elements such as potassium, calcium, magnesium, iron, silicon and sulfur. The slag is slightly alkaline after naturally absorbing oxygen for several days without being exposed to the rain, and it is suitable as a fertilizer and granular structure improver for acid clay after being used in combination with an organic fertilizer.

[0164] {circumflex over (5)} Due to the binary design of the flammable ignition cake (8) and the combustible fire-leading coal (10), they are transported and stored separately and thus reducing the fire-protection pressure. The five-leading coal (10) cannot be easily ignited directly by a single match or a lighter.

[0165] {circumflex over (6)} The powerful smoke abatement mechanism allows a variety of tow-value waste solids or semi-solids containing elements of carbon and hydrogen (or oxygen) to be incorporated into the formula of the present disclosure, as long as they are free from the aforementioned toxic and harmful substances, and they are ideally consumed as clean fuels. Scrap rubber fire powder having higher sulfur and nitrogen content may be blended in the coal placed underneath (9) in a larger proportion to reduce the product costs, but the exhaust gas cannot be directly discharged and should be discharged after purified by desulfurization and denitration device, thus being suitable for use in industrial stoves.

[0166] {circumflex over (7)} The product of the technology of the present disclosure is mainly used for small- and micro-sized stoves and some medium-sized stoves where compulsory combustion is not required, and is able to replace the combustion of scattered bitumite, the combustion of plant fuels, and the incineration of waste plastics such as polyolefin. The heat-generating efficiency and the cleanliness of the exhaust gas are already close to those from the combustion of natural gas, the investment in constructing a plant is not large, the cost of the raw materials is low, the reconstruction cost of the users' stoves is low, and the product is in terms of tonnage or calorific value per unit. All these are equivalent to or slightly lower than the widely used anthracite briquettes. Therefore, it is possible to promote the product according to the market model and reduce or even do not need to use financial subsidies.

[0167] FIG. 1 is a front view of the stove showing the upper ignition-downward combustion method as an example to explain the combustion mechanism of the product of the present disclosure; FIG. 1 is the main drawing and is also selected as the drawing of Abstract. FIG. 2 is the top view and the A-A section view of the mixed low-carbon alcohol ignition cake (8) as one of the core technologies of the present disclosure and the straw charcoal grille (11) that may be used in combination.

[0168] Names of the reference signs in FIGS. 1 and 2 are as follows:

[0169] 1. Furnace wall 2. furnace core 3. Heat insulating layer 4. Secondary air inlet hose 5. Primary air inlet and soot door 6. Fire-gathering plate 7. Large combustion chamber 8. Ignition cake 9. Coal placed underneath 10. Fire-leading coal 11. Straw charcoal grille 12. Outer ring vent hole 13. Inner ring vent hole 14. cross channel for flame on straw charcoal grille 15. Cast-iron lire grate

[0170] (1) Ignition paste The formula is as follows: a) isopropanol: 46%. b) ethanol: 20%. c) ethanediol: 5%. d) calcium oleate: 3%, e) magnesium oleate: 1%, f) calcium stearate: 3%, g) magnesium stearate: 1%. and h) water: 21%.

[0171] In a 0.5 m.sup.3 enamel-jacketed anchor stirring reactor, a, b and c are added. The stirrer is turned on at a low speed. The jacket steam is opened and heated slowly up to 60 C., while the gel paste-forming agents d, e, f and g are added gradually in batches, and finally, a burning rate inhibitor and gelling temperature rate regulator h is added slowly. A samples is taken and tested. The sample is qualified if the paste-forming point is 462 C. The sample is kept at 55 C. to 60 C. and injected into a 200 to 500 g polyvinyl chloride collapsible tube, which is sealed with a screw top, naturally cooled to the normal temperature, and thereafter packaged by a 10 kg corrugated carton for storage in the warehouse.

[0172] Since this ignition paste is a flammable product, aspects such as the layout and the construction of the workshops, test rooms and warehouses, the installation of workshop equipment and various lines, personnel training are all strictly implemented according to the fire protection regulations. The same is true with the ignition cake (8) below.

[0173] (2) Ignition cake (8): The formula is as follows: a) isopropanol: 46%, b) ethanol: 20%, c) ethanediol: 5%, d) water: 20%, e) calcium stearate: 5%, f) magnesium stearate: 3%, and g) hydrated lime: 1%.

[0174] In the same equipment for producing the ignition paste, a, b and c are added. The stirrer is turned to the lowest gear. The jacket steam is opened and heated up slowly, while the gelatinizing agent is added in batches. When the temperature of the material in the reactor rises to 60 C., the steam is turned down. After the feed liquid is almost transparent, a burning rate inhibitor and gelling temperature rate regulator d is added slowly, a supplementary curing agent g is sprinkled finally, and the temperature is allowed to rise to 70 C. A samples is taken and the gelatinization temperature is measured, which should be higher than 40 C. The temperature of the material is maintained at 50 C. to 60 C., and then the feed liquid is started to be poured into a stainless steel die having a diameter of 100 mm and a height of 150 mm. The layout and the size of the core rod of the die are prepared as specified in in FIG. 2 of the present specification. The core rod and the inner wall of the outer cylindrical sleeve must be sprayed with a liquid paraffin releasing agent for each casting. After the casting is completed, cold water is sprayed on the outer wall of the sleeve, and after the temperature of the material in the sleeve is lowered to 35 C. or less, the material is demoulded and sliced. Each single slice is encapsulated with a polyacetate fiber (cellophane) film bag. Cellophane and polyvinyl chloride are two kinds with the least breathability among the most common plastic films. It should be noted that the feeding pipe and the pipe fitting must be well insulated to prevent condensation at the time of casting. The highest allowable temperature for storage and transportation is 38 C.

[0175] (3) Straw charcoal grille (11): To a blender mixer, added are 100 kg of fully carbonized product of straw, pine, China fir, or hemp pole that all pass through a 10-mesh sieve, 2.8 mole or more of potassium water glass with a concentration of 15% to 20% in an amount of 6% of the carbonized product based on the dry base, and 3 kg of hydrated lime powder. After uniformly blended, the mixture is transferred to the hopper of the molding press and molded into the straw charcoal grille (11) as shown in FIG. 2 of the present specification under a large pressure. After the straw charcoal grille (11) is naturally dried in a well-ventilated and simple warehouse-style workshop, it is packaged in a super-thin plastic bag and then packaged in a corrugated carton in two stages for release.

[0176] (4) Fire-leading coal (10): The above-mentioned recommended fire-leading coal (10) which has a diameter of 100 mm, is 200 g on dry base and has a calorific value of (5000-5300)4.1868 kJ/kg is taken as an example, and the formula and the production process of the double-layer material thereof are as below:

[0177] a) Pine sawdust: 20 kg (15 kg); b) peanut shell powder: 5 kg (9 kg); c) fallen rosin: 9 kg (4.5 kg); d) lost-wax casted waste wax: 9 kg (4.5 kg); c) potassium hydroxide: 3.2 kg (1.6 kg); f) bitumite: 60004.1868 kJ/kg, volatiles: 35%, 18 kg of bitumite which all passes through a 60-mesh sieve. 30 kg of bitumite which all passes through a 25-mesh sieve (grade identical with the former one, 65.85 kg of bitumite which all passes through a 25-mesh sieve); g) hydrated lime powder 3.5 kg (5 kg); h) 40% potassium water glass: 5 kg (8 kg); i) water: 40 kg (35 kg); j) ferric oxide pigment: 0.3 kg (0.35 kg). The data in the parentheses are the formula data of the lower-layer materials of the fire-loading coal (10).

[0178] An open iron pan with a paddle stirrer was placed over a small-sized demonstration stove for boiling water in enterprises that use a combination of nine coal piles with a diameter of 100 mm formal by the product of the present disclosure, i is added, the coal pile is ignited to heat up, the stirring is started at the lowest speed, e and c are added, other debris such as branches, leaves, stones in c are picked out by hand, and d is added. When the temperature in the pan is close to the boiling point, the dissolution and emulsification operations should have been completed. The valve of the discharge pipe equipped with a wire mesh for filtration at the side pipe orifice at the bottom of the pan is switched on. The emulsion is filtered while it is hot and is allowed to flow into a kneading pot with a steam heating jacket, and a and b have already been added in the pot. After the completion of feeding, the kneading is started and the steam is opened until a and b are completely wet, the kneading is stopped, and the mixture is insulated for 15 to 20 minutes. f, g, h and j that have already been mixed uniformly in a dry mixer in advance are added and kneaded for 15 to 20 minutes until the materials are completely and uniformly mixed. The kneaded stock is conveyed to the 1# hopper of a hydraulic molding machine, and this is the upper feedstock of the fire-leading coal (10). Another set of the same system is used to prepare the lower feedstock of the fire-leading coal (10), which is conveyed to the 2# hopper of the hydraulic molding machine. The hydraulic molding machine is started and 1# feedstock and 2# feedstock in equivalent amount are conveyed into a molding cylinder in turn while they are hot, compression molded at one time, and transferred to a big large-scale low-temperature ventilation drying room while they are hot. The fire-leading coal (10) is dried at 60 C. until the moisture content is less than 10%, and is moved out together with a rail car to the natural cooling section in the workshop. When the temperature is lowered to 35 C. or less, each fire-leading coal (10) is packaged in an ultra-thin polyethylene plastic bag and then placed in a corrugated carton for storage. The molding pressure is carefully adjusted according to the variety and specification of the product to maintain a proper crispness, which facilitates a rapid temperature rise and the coal gasification reaction of the fixed carbon in the ignition stage. It is not suitable to blindly pursue high mechanical strength. The aforementioned formula has already had sufficient adhesive strength, and the molding pressure may be well adjusted such that the mechanical strength of the product is able to adapt to the logistic operation in a non-barbaric state,

[0179] (5) Coal placed underneath (9): The high-temperature zone above the coal placed underneath (9) has been already formed, and is easy to be smoothly ignited. The flexibility of the formula is large, but it is still necessary to pay attention to the reasonable occurrence stale and the gradient particle size distribution of the components thereof, so that the long-flame combustion period is prolonged as much as possible. The focus of some formulas has turned to the use of the low-cost raw materials and the product is supplied to the scattered residents in villages for heating at a lower unit price. The formula and the key points of the production process of a product for heating are as follows: a) straw pieces: 10%. b) pine sawdust: 10%, c) 20% of potassium water glass: 8%, d) bitumite powder (5000*4.1868 KJ kg, volatiles: 30%. sulfur: 2.5% or less): 68%, e. hydrated lime powder (in term of equivalent): equivalent to 3 times of sulfur equivalent, f) ferric oxide pigment: 0.5%, g) plastic pieces of polyolefin waste: 5%, and h) water: 5%.

[0180] d with a fineness of 25 mesh and the moderately-sized a, b and g are weighed, put into a mixer, and mixed for about 10 minutes. Thereafter, the pre-mixed e and f that are 10 times of the weight of d, a and h are added and the mixture is mixed continuously for several minutes, c is sprayed, and the mixture is mixed for several minutes. The mixture is moved into the hopper of the hydraulic molding machine, molded with a larger pressure, stored and dried naturally. When entering the stove, containing 10% to 15% of moisture is quite advantageous to the coal gasification reaction of the fixed carbon.

[0181] The formulas and production processes exemplified in the specific embodiments are merely for further illustrating the content of the present disclosure, but are not limited thereto, and the embodiments are all included in the scope of the present disclosure as long as they adopt the following technical contents in the briquette fuels for upper ignition-downward combustion: 1. the gel paste or cake (8) of low-carbon alcohols is used as the ignition agent, and the straw charcoal and other plant charcoals are used as auxiliary ignition agents, regardless of how the formula, the production process and the packaging form are adjusted; 2. the formula and the molding process of the fire-leading coal (10), as long as a) an ingredient having a high volatile content of 30%-40%-50% is adopted, b) both of the ignition point and the particle size of each fuel component are arranged in gradient to facilitate an orderly and sequential combustion, and c) after lignite aid other materials containing a macromolecular organic acid are partially emulsified (neutralization reaction with potassium hydroxide and the like), the mixture and a plant fuel boiled with an alkaline substance such as potassium hydroxide, hydrated lime and plant ash together constitute a fool and binder, so as to save the cost of the binder, regardless of how the formula, the production process and the packaging form are adjusted; 3, commercial iron sesquioxide containing at least 10% or more of iron sesquioxide and having a particle size of 50 nm or less is adopted to catalyze a part of the fixed carbon in the coal components to be gasified in the micropores and the vent holes in the red hot coal layer before combustion, so as to facilitate the extension of the long-flame combustion period; 4. the furnace core (2) has a height of at least from the bottom of the fire-leading coal (10) to the bottom of the fire-gathering plate (6), and the fire-gathering plate (6) itself is made from a light alkaline fire-resistant material having good thermal insulation property and containing a high content of magnesium and a low content of transition elements); 5. a total area of the air inlet of the stove and the vent holes of the coal briquettes is enlarged by 10%-20%-30%, as compared to that of anthracites originally used, and the diameter of the inner ring vent hole (13) is larger than that of the outer ring vent hole (12); 6. after tests, the raw material does not contain radioactive elements beyond standard, does not contain lead, cadmium, arsenic, mercury, thallium, and beryllium, and does not contain halogen, much sulfur and nitrogen as well as other toxic and harmful substances, so the burnt slag mainly contains elements such as potassium, calcium, magnesium, iron, silicon and sulfur, thus being used as a fertilizer; 7. various combustible solids and semi-solids, including the low-value wastes thereof, may all be used as a formulated fuel according to the methods described in the present specification to realize highly efficient and clean combustion, and are thus included in the content of the present disclosure.