COMPACT COMBUSTION CHAMBER MOLD FOR A CIRCULATING FLUIDIZED BED BOILER AND A METHOD OF OBTAINING A COMBUSTION CHAMBER WITH THIS MOLD

Abstract

Disclosed herein is a compact (e.g., one-piece) refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite and mixtures thereof, and a method of obtaining a combustion chamber with this mold.

Claims

1. A single-piece refractory cast combustion chamber mold for circulating fluidized bed boilers that provides the combustion and/or gasification of biomass, waste, lignite, and/or mixtures thereof, comprising: characterized by comprising; at least one inner mold in one-piece, for forming inner walls of the combustion chamber, at least one outer mold in one-piece, for forming the outer walls of the combustion chamber by wrapping around the at least one inner mold, anchoring metals that are placed between the at least one inner mold and the at least one outer mold such that the concrete is held when the concrete is poured to obtain a combustion chamber between the at least one inner mold and the at least one outer mold, a thermal insulation layer placed on outer facing surfaces of the anchoring metals to isolate heat, at least one fitting which enables the at least one inner mold and the at least one outer mold to be connected to each other at a predetermined distance from each other and, when removed, enables the at least one inner mold and the at least one outer mold to be separated from each other to obtain the combustion chamber, and a refractory layer that is poured and oven-dried between the thermal insulation layer and the at least one inner mold to make the combustion chamber resistant to temperature.

2. The combustion chamber mold according to claim 1, wherein the at least one inner mold and the at least one outer mold comprises: primary stage air nozzle inlets and a secondary stage air inlet to allow oxygen to enter the combustion chamber, an ash removal part to allow the waste from burned fuel to be removed to the outside, a biomass feeding point to allow intake of biofuels into the combustion chamber, a lignite feeding point to allow lignite fuels to be taken into the combustion chamber, a burner inlet area where a burner is placed such that fuels in the combustion chamber are mixed with air and burned, burner cooling air inlets to cool the burner by taking in air from the outside, a seal pot return inlet area where a seal pot is placed to cool sand without the sand leaking backwards, and a thermocouple port area where a thermocouple is placed to measure a temperature of the combustion chamber is be placed.

3. The combustion chamber mold according to claim 1, characterized by comprising; mentioned wherein the at least one fitting is a bolt.

4. The combustion chamber mold according to claim 1, wherein the at least one inner mold and the at least one outer mold are made of sheet steel.

5. The combustion chamber mold according to claim 1, wherein the thermal insulation layer is made of silica boron.

6. A method of obtaining a one-piece refractory cast iron combustion chamber for circulating fluidized bed boilers, enabling the combustion and/or gasification of biomass, waste, lignite, and/or mixtures thereof, the method comprising: disassembling a one-piece inner mold for forming inner walls of a combustion chamber, and a fitting for connecting a one-piece outer mold for forming outer walls of the combustion chamber by wrapping around the one-piece inner mold, with a predetermined distance in-between, placing anchoring metals between the disassembled one-piece inner mold and one-piece outer mold, placing a thermal insulation layer on the outer facing surfaces of the anchoring metals, connecting the one-piece inner mold and the one-piece outer mold are connected with the fitting, closing all spaces of the one-piece inner mold and the one-piece outer mold that open to the outside, pouring a refractory layer between the thermal insulation layer and the one-piece inner mold, pouring concrete between the one-piece inner mold and the one-piece outer mold, holding and drying the concrete, and oven drying and holding the mold to remove moisture.

7. The method of obtaining a combustion chamber according to claim 6, wherein the placing the thermal insulation layer further comprises the step-of using a silica boron insulating material.

8. The method of obtaining a combustion chamber according to claim 6, wherein the holding and drying of the concrete further comprises holding the concrete outdoors for at least 48 hours.

9. The method of obtaining a combustion chamber according to claim 6, wherein the oven drying and holding the mold further comprises: gradually raising a temperature of the oven to 350 C. over at least 24 hours, and holding the mold in the oven at a constant temperature of 350 C. for at least 24 hours.

10. The method of obtaining a combustion chamber according to claim 6, wherein the closing all spaces further comprises the process step of closing primary stage air nozzle inlets, a secondary stage air inlet, an ash removal part, a biomass feeding point, a lignite feeding point, a burner inlet, burner cooling air inlets, a seal pot return inlet, and a thermocouple port.

Description

FIGURES TO UNDERSTAND THE INVENTION

[0019] The structural and characteristic features and all advantages of the invention will be more clearly understood by means of the figures given below and the detailed description written with reference to these figures, and therefore, the evaluation should be made by taking these figures and detailed description into consideration.

[0020] FIG. 1 is a view of a circulating fluidized bed boiler for combustion and/or gasification of biomass, waste, lignite, and mixtures thereof.

[0021] FIG. 2 is a representative cross-sectional top view of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof, according to at least one embodiment of the invention.

[0022] FIG. 3 is a representative cross-sectional view from the bottom of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof, according to at least one embodiment of the invention.

[0023] FIG. 4 is a representative perspective view from the bottom of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof, according to at least one embodiment of the invention.

[0024] FIG. 5 is a representative cross-sectional view from the side of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof, according to at least one embodiment of the invention.

[0025] FIG. 6 is a representative side perspective view of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof, according to at least one embodiment of the invention.

[0026] FIG. 7 is another representative side perspective view of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite and mixtures thereof, according to at least one embodiment of the invention.

DETAILED DESCRIPTION

[0027] The following are brief descriptions of reference numerals in the figures: [0028] 1. Inner Mold [0029] 2. Outer Mold [0030] 3. Fitting [0031] 4. Primary Stage Air Nozzle Inlets [0032] 5. Ash Removal Port [0033] 6. Biomass Feeding Point [0034] 7. Lignite Feeding Point [0035] 8. Secondary Stage Air Inlet [0036] 9. Burner Inlet [0037] 10. Burner Cooling Air Inlets [0038] 11. Seal Pot Return Inlet [0039] 12. Thermocouple Port

[0040] In embodiments, the one-piece refractory cast iron combustion chamber mold for circulating fluidized bed boilers subject to the invention, which enables the combustion and/or gasification of biomass, waste, lignite and/or mixtures thereof, and the method of obtaining a combustion chamber with this mold, as well as the preferred configurations/applications thereof, are described herein in further detail, without any restrictive effect.

[0041] FIG. 6 is a side perspective view of a one-piece refractory cast iron combustion chamber mold for a circulating fluidized bed boiler for the combustion and/or gasification of biomass, waste, lignite, and mixtures thereof.

[0042] The combustion chamber mold comprises a one-piece inner mold (1) forming the inner walls of the combustion chamber and a one-piece outer mold (2) surrounding said inner mold (1), forming the outer walls of the combustion chamber.

[0043] In a preferred embodiment of the invention, said inner mold (1) and outer mold (2) comprise cavities for primary stage air nozzle inlets (4) and secondary stage air inlets (8) for introducing oxygen into the combustion chamber and an ash removal inlet (5) for removing waste from the combusted fuel. In this configuration, there are also biomass feeding point (6) to receive biofuels into the combustion chamber, lignite feeding point (7) to receive lignite fuels into the combustion chamber and burner inlet (9), which is the area where the burner will be placed to ensure that the fuels in the combustion chamber are mixed with air and burnt. Said configuration may also comprise burner cooling air inlets (10) for cooling the burner by taking air from the outside, seal pot return inlet (11) for the seal pot to cool the sand without leaking back sand, and thermocouple port (12) for the thermocouple for measuring the temperature of the combustion chamber.

[0044] In a preferred embodiment of the invention, said inner mold (1) and outer mold (2) are made of sheet steel.

[0045] The combustion chamber mold comprises anchoring metals placed between said inner mold (1) and said outer mold (2) for holding the concrete when concrete is poured between said inner mold (1) and said outer mold (2) to form a combustion chamber, and a thermal insulation layer placed on the outward facing surfaces of said anchoring metals for isolating heat.

[0046] In a preferred embodiment of the invention, said thermal insulation layer is made of silica boron.

[0047] The combustion chamber mold also comprises a fitting (3) for connecting said inner mold (1) and said outer mold (2) to each other at a predetermined distance there between, and for separating said inner mold (1) and said outer mold (2) from each other when dismantled, so as to obtain a one-piece combustion chamber.

[0048] In a preferred embodiment of the invention, said fitting (3) is a bolt.

[0049] The basic configuration of the combustion chamber mold finally comprises a refractory layer, which is poured and baked between said heat insulating layer and the inner mold (1), so that the combustion chamber is temperature resistant.

[0050] In at least one embodiment of the invention, the inner mold (1) and the outer mold (2) are opened in one piece by removing the bolts, and the anchoring metals are installed, and the heat insulation layer is first placed on the back of the outer metal. Then bolts are connected, and the inner mold (1) and outer mold (2) are connected. After this stage, all holes and entrances are closed, a refractory layer is poured between the heat insulation layer and the inner mold (1), and the refractory cast iron combustion chamber with all entrances is manufactured in one piece. Thus, refractory cast iron combustion chamber of circulating fluidized bed boiler will be manufactured in desired capacities in a short time.

[0051] The method of obtaining a one-piece refractory cast iron combustion chamber for circulating fluidized bed boilers, which enables the combustion and/or gasification of biomass, waste, lignite and/or their mixtures, may comprise: [0052] disassembling the one-piece inner mold (1) and the fitting (3), wherein the one-piece inner mold (1) forms the inner walls of the combustion chamber, and wherein the fitting (3) connects the one-piece outer mold (2), wherein the one-piece outer mold (2) forms the outer walls of the combustion chamber by wrapping around said inner mold (1), with a predetermined distance between the one-piece inner mold (1) and the one-piece outer mold (2), [0053] placing anchoring metals between the disassembled inner mold (1) and outer mold (2), [0054] placing the thermal insulation layer on the outward facing surfaces of the mentioned anchoring metals, [0055] connecting said inner mold (1) and outer mold (2) by means of fitting (3), [0056] closing all spaces of said inner mold (1) and outer mold (2) opening to the outside, [0057] pouring the refractory layer between the mentioned thermal insulation layer and the inner mold (1), [0058] pouring concrete between the mentioned inner mold (1) and outer mold (2), [0059] holding and subsequent drying of the concrete, [0060] oven drying and holding the mold to remove moisture.

[0061] In a preferred embodiment of the method of the invention, silica boron insulation material is used in the step of placing a heat insulation layer on the outward facing surfaces of said anchoring metals.

[0062] In a preferred embodiment of the method of the invention, in the step of holding and drying the concrete, the concrete is kept outdoors for at least 48 hours.

[0063] In a preferred embodiment of the method of the invention, in the step of holding the mold by oven drying to remove moisture, the oven is gradually raised to 350 C. in at least 24 hours and kept at a constant temperature of 350 C. for at least 24 hours.

[0064] In a preferred embodiment of the method of the invention, in the step of closing all spaces opening to the outside of said inner mold (1) and outer mold (2), primary stage air nozzle inlets (4), secondary stage air inlet (8), ash removal inlet (5), biomass feeding point (6), lignite feeding point (7), burner inlet (9), burner cooling air inlets (10), seal pot return inlet (11) and thermocouple port (12) are closed.

[0065] In a preferred embodiment of the method of the invention, a high-bonded, high-temperature, high-strength and erosion-resistant fire refractory with cement can be cast together between the inner mold (1) and the thermal insulation layer.

[0066] Thus, a one-piece refractory cast refractory combustion chamber mold and a method of obtaining a combustion chamber from this mold, which enables the combustion and/or gasification of biomass, waste, lignite and/or their mixtures for circulating fluidized bed boilers, are presented.