A CONDENSATION DEDUST-DEMISTER SET

Abstract

A condensation dedust-demister device, comprises at least one of the followings: a condensator, a refluent demister, a large curve demister, a mixed curve demister and a super-sine demister etc.. Said condensator with a shell/cavity style pipeline refrigerating system or cooling system can condense dust into mist/haze and be designed as the first class tube demister, consequently said refluent demister and so on can collect and dedust-demist what condensator condensed by centrifugal effect, with the assisting of easiness made by collecting liquid wall and drain as well as multiple classes composition the condensation dedust-demister set can dedust flue gas to 0 mg/Nm3 and demist to 10 mg/Nm3 when raw gas containing dust less than 20 mg/Nm3. This set can remove grains of SO3 aerosol and Hg0 etc. due to be condensed to haze at the same time.

Claims

1. A condensation dedust-demister set, its characteristic lies in, comprises at least one of following demister: a condensator, a refluent demister, a large curve demister, a mixture curves demister and a super-sine demister, thereinto, said condensator with a shell style heat-conductible pipeline is to duct refrigerating medium owning the function to condense dust of pure gas into mist/haze; Said condensator and each demister can be assembled individually.

2. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, said refrigerating medium flows inside shell journey passage or tube journey passage of said shell style pipeline, or flows both inside shell journey passage and tube journey passage simultaneously.

3. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, said refrigerating medium is of utilizable common one including compressed gas which can be used as refrigerating medium.

4. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, one at least of said shell style pipeline runs through section of flue gas flow and a collecting gas box is assembled at each end which consequently forms a demisting module, and one at least of said demisting module covers the whole section of flue gas flow; Or at least one joint locality of single said shell style pipeline of said demisting module is set to joint single said pipeline; Or at least one transition collecting gas box is located on said demisting module to joint single said shell style pipeline beside itself two side; Or at least one mid-collecting gas box is located on said demisting module via which jointing to get through the section of flue gas flow; A demisting module can comprise a willful combination of at least one of said joint methods; at least one of said demisting module covers a whole section of flue gas flow.

5. According to claim 1 said a condensation deduct-demister set, its characteristic lies in, the surface of fundamental refrigerating function elements of said condensator can be designed with heat radiating elements or frames.

6. A condensation dedust-demister set, its characteristic lies in, at the first class site is located with said condensator, at the second class site and the possible consequent class sites are located with at least 0 said condensators simultaneously.

7. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, at least one cooling medium or mixture cooling medium of water, oil and gas can substitute for said refrigerating medium; A cavity style pipeline including refluent curves said in claim 10 can substitute for segments or whole of said shell style pipeline; Said two substitutions can be not in simultaneity.

8. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, a probably designed pure gas heater in a project can utilize said shell style pipeline.

9. According to claim 8 said a condensation demister set, its characteristic lies in, the surface of fundamental pure gas heating function elements can be designed with heat radiating elements or frames.

10. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, the demisting element owning demisting function of said refluent demister comprises at least one demisting vane owning at least one refluent curve of said vane section which forces flue gas to be refluent; Near broken lines can substitute for said refluent curve.

11. According to claim 10 said a condensation dedust-demister set, its characteristic lies in, the unit layer of demisting module comprises said demisting elements via composing each others, one demisting module comprises at least one layer of said unit layer, one layer demister occupying wholly flow section of flue gas comprises at least one demisting module.

12. A condensation dedust-demister set, its characteristic lies in, a demister which fundamental demisting function element is vane are designed with drains; and/or with collecting liquid walls; and/or with venturitube or near venturitube passages for flue gas comprising vanes nearest each other, and/or with parallel flue gas passages, said venturitube and parallel passages can comprise various mixture flue gas passages; and/or with convexities and/or with no intended leading current frames or structures at imports and/or exports of vanes for flue gas; Near broken lines can substitute for said various section curves of vanes or frames or structures; The surface meeting flue gas owning demisting function of a demister own at least one frame of vertical drain, convexity, concave, hole, hamulus, convex slot, concave slot, cranny; Said above various assistant curves, frames and structures can be applied to a demister individually.

13. (canceled)

14. (canceled)

15. According to claim 10 said a condensation dedust-demister set, its characteristic lies in, said refluent curve of refluent demister can be designed as a large curve to form a demisting vane; Vanes with said large curve and said refluent curve can together form various mixture curves vanes demisters; Near broken lines can substitute for section curves of various said vanes.

16. According to claim 1 said a condensation dedust-demister set, its characteristic lies in, the section curve of demisting vane of said super-sine demister owning demisting function is a sine or near sine curve which amplitude value, is more than or equal to 1, or is a curve with absolute value sine shape, or comprise sine curves and absolute value sine curves; Near broken lines can substitute for section curves of various said vanes.

17. (canceled)

18. (canceled)

19. (canceled)

20. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] This invention is described in more detail below on the basis of the theories with reference to the accompanied drawings.

[0022] In the drawings,

[0023] FIG. 1 sketch maps of the sections of various shell style pipelines.

[0024] FIG. 2 planform views of the different condensator modules.

[0025] FIG. 3 cutaway views of the heat radiating pieces and heat radiating screw threads of condensator or heater for flue gas.

[0026] FIG. 4 sketch map of section curves of various refluent demisters.

[0027] FIG. 5 sketch maps of compositions of demisting elements of refluent demister.

[0028] FIG. 6 sketch maps of shapes and its change of demisting elements of refluent demister.

[0029] FIG. 7 sketch maps of venturitube effect of demisting vanes.

[0030] FIG. 8 sketch maps of sections and layers compositions of super-sine demisting vanes.

[0031] FIG. 9 axonometric drawing of various frames and structures for disturbing flue gas flow on surface of demisting element.

[0032] FIG. 10 sketch maps of drains and collecting liquid walls of super-sine demister and normal wave demister.

[0033] FIG. 11 sketch maps of venturitube and parallel flue gas passages of compositions of refluent demisting vanes.

[0034] FIG. 12 sketch maps of section curves of large curves and mixture curves of demisting vanes.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Herein give a detailed description for the present invention assisted with attached figures as follows.

The Elastic Collision of Tiny Dust

[0036] Today the difficult problem of super-pure emission for flue gas lies in getting rid of tiny dust, a flue gas treated with the method of wet spraying can wholly carry the dust with diameter of 0-15 m, including PM2.5, can carry 50% of dust with diameter of 15-250 m, but the dusts with diameters more than 500 m cannot be carried. Because the surface tension of water the tiny dust will create elastic collision with water drop when impacting each other, so the tiny dusts are difficult to remove, they will fly over along with the flue gas. But when refrigerating or cooling saturated flue gas the vapor will condense on the surface of tiny dust, consequently form mist and haze, as well as SO3 aerosol and Hg0 etc..

No Destruction No Construction

[0037] Because diameters of tiny dusts and mist/haze condensed by demister are too little so they own the nature of wind, normal centrifugal demister is difficult to collect and demist, in order to demist must disturb the flow of flue gas to increase the odds of collision consequently collect and increase their diameters, then demist by centrifugal demister.

The Condensator

[0038] The condensator with a shell style heat-conductible pipeline is to duct refrigerating medium via vaporizing or expanding to condense dust of pure gas into mist/haze. Said shell style pipeline comprises shell journey passage and tube journey passage, two pipelines with all kinds of sections including circle, square, wave shape, etc. insert together to form a least function element for cooling flue gas, such as FIG. 1 of sketch maps of the sections of various shell style pipelines, when designed as shell style pipeline the inner tube can be a solid material, thereinto, the shell journey passage comprises the section between two shell section curves, a section illustrated as 11, the tube journey passage comprises the section inside inner tube section curve, a section illustrated as 12, some disturbing and/or supporting elements 13 inside shell journey passage can be designed, if not the supporting elements can assembled at two ends, the refrigerating mediums flows inside shell journey passage but not the tube journey passage that can keep stability of structure, this structure can utilizes refrigerating efficiently. As the lower temperature causing by refrigerating medium so said refrigerating medium can flow inside tube journey passage and the shell journey passage can be filled with flowing or not heat-conductible mediums such as water, air or oil etc. as buffer. Said shell style pipeline can be a more then 2 layers shells structure such as multiple tube with supporting elements illustrated as 14, or in order to conduct heat etc. to design a multiple shell style pipeline which belongs to a shell style pipeline, for a instance, around shell style pipeline or tube style pipeline some tubes 15 are set to obtain more conducting heat area and disturbing effect consequently a more efficient cooling effect, or in the interest of disturbing for flow some screw tubes and/or wave tubes etc. 16 can be set in the shell journey passages and/or tube journey passages. Said multiple shell style passage/pipeline namely it is a multiple shells structure of more than 2 layers, and/or some shell journeys and/or tube journey passages annexed some shell journeys and/or tube journey passages. Now, Said shell journey passage denotes 2 or more than 2 independent closed section curves comprises a possible least flow section which contains at least one independent closed section that cannot be cut off; which can be named shell journey 1, shell journey 2 etc.; Said tube journey passage denotes 1 independent closed section curve comprises a possible least flow section which contains no independent closed section that cannot be cut off; which can be named tube journey 1, tube journey 2 etc.. Said definitions of shell journey passage and tube journey passage are the same with all concepts of present invention, as well as said the concept of cavity style pipeline in present invention which is equal to the concept of tube journey passage.

[0039] Illustrated as FIG. 2, One at least of said shell style pipeline runs through section of flue gas flow and two collecting gas boxes 21 and 22 are assembled at two ends which consequently forms a demisting module 27, some supporting boards 23 can be assembled between two collecting gas boxes, and one at least of said demisting module covers the whole section of flue gas flow; Or at least one joint locality of single said shell style pipeline of said demisting module is set to joint single said pipeline with joint element 24; Or at least one transition collecting gas box 25 is located on said demisting module to joint single said shell style pipeline beside itself two side; Or at least one mid-collecting gas box 26 is located on said demisting module 27 via which jointing to get through the section of flue gas flow; A demisting module can comprise a willful combination of at least one of said joint methods; at least one of said demisting module covers a whole section of flue gas flow. The number of shell style pipelines contained in a demisting module may be 1-100, usually can be set as 10-30; The number of said various joint localities depends on the diameter of tower, the conditions of assembly, the intensity of structure elements etc., usually can be set as 0-30. In this invention said section of flow denotes the section or near section of a flowing passage of gas or liquid.

[0040] Said refrigerating medium of the condensation dedust-demister set in present invention is of utilizable common one including compressed gas which can be used as refrigerating medium, said compressed gas can be one of the followings: air, nitrogen, hydrogen, oxygen, nature gas, liquefied petroleum gas, etc., as well as a supplied wind and/or a flue gas of a boiler. The heat energy generated by refrigerator should be utilized to heat pure gas for an example which heater can designed with said conductible shell style pipeline, which surface of fundamental pure gas heating function elements can be designed with heat radiating elements or frames.

[0041] For the effect of refrigerating, the surface of fundamental refrigerating function elements of the condensator in present invention can be designed with heat radiating elements or frames, such as wing slice, screw slice etc. illustrated as FIG. 3, Said fundamental refrigerating function elements connotes a least frames or structures of refrigerating or cooling function of a demister such as a passage of shell style pipeline or cavity style pipeline in present invention, thereto a usual heat conductible iron plank, tube and piece.

[0042] Present invention set the condensator locating on the first class site to meet wet flue gas firstly, along with the direction of flue gas others demisters in present invention locating on the sites following said first class, the condensator will take the effect of tube type demister at the same time, a large numerous of slurry drops together with mist/haze condensed by condensator will collide with shell style pipeline consequently pool to drip, thereby this method can efficiently get rid of slurry drops and hazes containing dusts, at the same time, because the large numerous slurry drops usually in a number of 10000-40000 mg/Nm3 so which can catch more mist generated just, especially for a tower which flue gas is not in saturation or amount of spray slurry is less relatively this method appears more advancement. For the delay of heat conducting and course of misting so the condensators should be set at several sites behind the first class. Said class is usually divided by a set of supporting frame in a distance of usual 2 meters between them which will be set with a demister.

[0043] When a raw gas containing dust less than 20 mg/Nm3 or the emission standard is lower relatively or the condensator locates on a site except the first class, the refrigerating system can be changed to cooling system, at least one cooling medium or mixture cooling medium of water, oil and gas can substitute for said refrigerating medium, especial environmental air around, a boiler supplied wind, a lower temperature flue gas emitted, and a cavity style pipeline including refluent curves said in claim 10 can substitute for segments or whole of said shell style pipeline, said two substitutions can be not in simultaneity. Said cavity style pipeline, namely via which area/cavity wrapped by its closed section curve at radius direction inside which a current medium will flow, referring to FIG. 1.

The Refluent Demister

[0044] Illustrated as FIG. 4, the refluent demister, the demisting element 48 comprises at least one demisting vane 41 owning at least one refluent curve of said vane section which makes flue gas to be refluent opposing to its original direction, said section denotes the section at radius direction namely width direction, without special explanation in present invention the section of demisting vanes all denote a section at radius namely width direction. Because the centrifugal principle the direction of refluence opposing to mustn't be the direction of the raw gas before entering into demister, so the direction of fluent curve can be anyone at will willfully. Said refluent curve 410 denotes the section curve of demister vane 41 which random tangents of two sides can form a least angle 49 opposite flue gas passage less than or equal to 90, herein said refluence implies the change of flow direction of flue gas is more than or equal to 90. The curvature of said refluent curve should be as larger as possible to obtain a better centrifugal effect for demisting, the larger slurry drops pooled will be blew to collecting liquid wall 411 behind it which owning the function to hold up and collect drops and mist transported by flue gas comprises demisting vane or parts of demisting vane or independent demisting vane. The drops and mist held up by said collecting liquid walls will flow downwards to a drain 42 which comprises nearest vanes or one bended vanes or an independent vanes such as FIG. 5. The slurry in the drains forced by kinetic pressure of flue gas will be drained out from holes 44 within two end boards and/or supporting boards 45 of a demisting module or drained out directly without ends boards.

[0045] The flue gas spraying out from flue gas passage 43 mix together at overfall zone 46 to increase the diameters of mist, the large drops sprayed out are collected by collecting liquid walls to drain, and the disturbing zone 47 can increase probability of pooling.

[0046] The nearest demisting vanes of refluent demister comprise a venturitube or near venturitube passages 111 for flue gas, such as FIG. 11, said venturitube or near venturitube passage denotes a flue gas passage section similar to the section of venturitube which can accelerate the velocity of flue gas, can be limited by section curves of nearest vanes, Near broken lines can substitute for said curves. Said nearest demisting vanes can also be set as parallel flue gas passages 113 which denote a section curve of a demisting vane can be obtained via others section curves of demisting vanes in a same demister module moving parallelly. Said above flue gas passages can comprise vairous mixture flue gas passages 116, both omit disturbing zones 47 but change to confluent entrances 114 and 115 or drains 117 of parallel flue gas passages, and exports of flue gas passages 112 can be designed as acceleration or deceleration style.

[0047] Said venturitube or near venturitube passage can be applied to the vanes of the super-sine demister, the large curve demister, mixture curve demister etc..

[0048] In the permissible extent of demisting capability the demisting element can be various in style, illustrated as FIGS. 5, 6, 7, 9 of structures and frames of surface, 11 and 12 etc., containing but do not being limited into what mentioned in this invention and containing what can be reasonable imagined: the passages of flue gas can own multiple refluent curves, the exports of passage of flue gas can be opened upwards, the angle of the entrances of passages of flue gas opposite the flue gas flow direction before entering into said passages can be less than |90|, various composition of various demisting elements of present invention, the near broken lines can substitute for section curves of said vanes.

[0049] One demisting module comprises at least one layer of unit layer, said layers joint or not each other, one layer demister occupying wholly flow section of flue gas comprises at least one demisting module, said demisting elements via composing each other form a unit layer, said composing each other contains but do not be limited into what mentioned in this invention and contains what can be reasonable imagined: the styles of demisting vanes including number, the number of demister vanes of demisting element can be 1-10 pieces, normally 3-5 pieces, illustrated as FIGS. 4, 5, 6, 7, 9 of surface structures, 11, 12 of mixture curve demisting elements containing refluent curve vanes, a willful various composing at will between demisting elements, unit layers, demisting modules, and the imports direction of flue gas 43, the drains and collecting liquid walls can be set more than one or do not be set, staggered or ordered disposals of demisting elements between unit layers such as FIG. 5. Various models have various functions, a model such as 65 in FIG. 6 can adapt for a lower flue gas velocity or a lower load, but model of 66 can adapt for a higher flue gas velocity or load.

[0050] The drains and collecting walls of demister proffer a solution for transporting slurry drops while a flue gas in a higher velocity for a higher efficiency of demisting.

The Large Curve Demister & Mixture Curve Demister

[0051] In some possible cases of higher velocity of flue gas such as horizontal flue demister transporting slurry drops will happen even if without accelerating flue gas so the large curve demister is born for a solution.

[0052] Said refluent curve of refluent demister can be changed to a large curve to form a demisting vane, illustrated as 121 of FIG. 12, said large curve 121 denotes the section curve of demister vane which random tangents of two sides can form a least angle 122 opposite flue gas passage more than or equal to 90, illustrated as 121 and 122 of FIG. 12, herein the change of flow direction of flue gas is less than or equal to 90. 123 shows a drain and 124 shows a collecting liquid wall which are similar to refluent demister.

[0053] Vanes with said large curves and said fluent curves can together form various mixture curve vanes demisters, such as 125 in FIG. 12.

[0054] Near broken lines can substitute for section curves of various said vanes.

The Super-Sine Demister

[0055] In some possible cases of flue gas of lower velocity such as lower load of a boiler the accelerating flue gas passages of demister are needed. The super-sine demister intends to increase the centrifugal effect of flue gas inside its passage. Such as FIG. 8, the section curve of demisting vane of said super-sine demister owning demisting function is a sine or near sine curve 81 which amplitude value is more than or equal to 1, or is a curve with absolute value sine shape 82, or comprise sine curves and absolute value sine curves, such as curves of 85, 86, 87, 88.

[0056] One super-sine demisting module comprises at least one single layer, said single layer comprises various section curves of super-sine demister vanes said above, the direction of wave crest of near layers is same 84 or opposite 83, at least one demisting module covers a whole section of flue gas flow.

[0057] In the permissible extent of demisting capability the vane of super-sine demister can be various, Such as some near broken lines can substitute for section curves of various said vanes, referring to FIG. 6.

[0058] For some reasons the phenomena of carrying slurry drops will occur probably, such as in a case of horizontal demister, illustrated as FIG. 10, on the top of super-sine demister or normal wave demister the drains 101 and collecting walls 102 are set to collect and drain slurry drops carried by flue gas, a common drain 103 or collecting wall 104 can be designed for several vanes, which functions are similar to that of refluent demister.

[0059] Said methods above of setting drains and collecting walls can be applied to vanes of various super-sine demister, normal wave demister, broken line demister, can also be applied to vanes of a demister which fundamental function elements of demisting is vanes, such as vanes of refluent demister illustrated as 61, 62, 63, 64 of FIG. 6, vanes of mixture curve demister illustrated as 126 of FIG. 12, vanes of large demister illustrated as 127 of FIG. 12, as well as normal wave demister, hollow wave demister etc..

[0060] A willful composition of at least one of said various drains and various collecting walls containing what can be imaged can be applied to a demister simultaneously at will.

The Disturbing Methods

[0061] In order to increase tension of overfall and odds of collision of tiny mist/haze, such as FIG. 9, the surface meeting flue gas owning demisting function of a demister own at least one frame of vertical drains, convexity, concave, hole, hamulus, convex slot, concave slot, cranny, what aimed said various frames and structures lies in disturbing flue gas flow; Said above various assistant frames and structures can be applied to a demister individually.

[0062] A demister which fundamental demisting function elements is vane are designed with convexity 71 at imports and/or exports of vanes for flue gas, said demister can be one of refluent demister, large curve demister, mixture curve demister, super-sine demister, and normal wave demister, broken line demister, and so on, a convexity can accelerate the velocity of flue gas consequently enhance the venturitube effect so can remove haze more efficiently, also can increase the tension of overfall so as to increase the probability of collision and pooling. Said convexity can be designed along with whole or parts of edge of vanes, or as something similar to a row of globes. Said edge should be a certain extent from edge to internal vane.

[0063] As another apparent characteristic of present invention set, a demister which fundamental demisting function element is vane is designed with no intended leading current frames or structures at imports and/or exports of vanes for flue gas. Said intended implies mainly or merely designed, said leading current connotes forcing a current from a direction to another direction in a minimum extent of pressure loss and a maximum extent of flow field uniformity, said edge should be a certain extent from edge to internal vane which can act as an element of leading current.

[0064] While a demister assembled vertical-wards and which vanes horizontal-wards a collecting liquid wall or an opposing vane may need to incline upwards a little to form a drain.

[0065] The present invention set can be assembled at horizontally or vertically normally due to the direction of flue gas flow and/or the efficiency of demisting, and can be set as a style of plain or ridge

The Economic And Social Benefit

[0066] The present invention proffered a condensation dedust-demister set, which can accomplish super-pure emission of dust of less than 5 mg/Nm3 and mist of less than 10 mg/Nm3 efficiently with a lower cost and a lower pressure loss of around 200 Pa, and can adapt to a raw gas dust of more than 30 mg/Nm3 for super-pure emission. For the dust of 60 mg/Nm3 of a raw gas, via multiple condensators, cooling deeply and/or multiple refluent demisters etc. can succeed.

[0067] With cooling deeply, demisting efficiently can accomplish dust emission of 0 mg/Nm3, with a heater for pure gas can accomplish mist emission of 0 mg/Nm3.

[0068] The present invention set can remove SO3 aerosol and Hg0 etc. simultaneously.

Statement

[0069] Said above, others promised by law may draw out modifications and variations according to the structures and technology and principles of this invention, therefore that the appended claims are intended to cover such modifications and variations which are within the true scope and spirit of this invention.