CN117053207A - Coal gasification ash incineration system and combustion method - Google Patents
Coal gasification ash incineration system and combustion method Download PDFInfo
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- CN117053207A CN117053207A CN202311075189.6A CN202311075189A CN117053207A CN 117053207 A CN117053207 A CN 117053207A CN 202311075189 A CN202311075189 A CN 202311075189A CN 117053207 A CN117053207 A CN 117053207A
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- coal gasification
- gasification ash
- ash
- primary air
- coal
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- 238000002309 gasification Methods 0.000 title claims abstract description 162
- 239000003245 coal Substances 0.000 title claims abstract description 151
- 238000009841 combustion method Methods 0.000 title claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 72
- 238000000227 grinding Methods 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 36
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000012546 transfer Methods 0.000 claims description 25
- 239000000779 smoke Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- 239000002817 coal dust Substances 0.000 claims description 10
- 239000010866 blackwater Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 230000032258 transport Effects 0.000 claims description 3
- 239000002956 ash Substances 0.000 description 103
- 239000000843 powder Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The application relates to a coal gasification ash incineration system and a combustion method, wherein the coal gasification ash incineration system comprises: a grinding device (4) configured to grind coal gasification ash including at least one of gasification fine slag and gasification coarse slag; -a separation device (5) configured to separate off the exhaust gases generated during the grinding of the coal gasification ash by the grinding device (4), the separation device (5) comprising an exhaust gas outlet outputting the exhaust gases; the combustion furnace comprises a furnace body (10), a wind box (9) which is arranged on the furnace body (10) and communicated with the exhaust gas outlet, and a combustor (8) which is arranged on the furnace body (10) and used for igniting coal gasification ash separated by the separation device (5) and then conveying the coal gasification ash into the furnace body (10).
Description
Technical Field
The application relates to the field of combustion systems, in particular to a coal gasification ash incineration system and a combustion method.
Background
The coal chemical industry is a process in which coal is used as a raw material and is converted into clean gas, liquid and solid fuel and chemical products through chemical processing. The large-scale coal gasification technology is a tap and core technology for clean and efficient utilization of coal, and entrained flow gasification is a mainstream gasification technology at present due to the advantages of high pressure, large treatment capacity, high conversion efficiency and the like. However, in the entrained flow gasification process, two high-carbon solid wastes, namely gasification coarse slag and gasification fine slag, are generated, and currently coal chemical enterprises generally adopt a dehydration landfill mode for treatment, so that serious resource waste is caused, and meanwhile, soil and groundwater pollution is caused due to improper treatment.
With respect to the characteristics of coal gasification ash, the related art proposes to treat coal gasification ash (including gasification coarse slag and gasification fine slag) by adopting a circulating fluidized bed mixed combustion or newly-built incineration device.
The coal gasification ash has the characteristics of high water content, high fixed carbon content, low heating value, low volatile content, finer particles, high ignition temperature, difficult combustion and the like, and adopts the prior art:
1) By adopting the blending combustion of the circulating fluidized bed boiler, the problems of low blending combustion ratio, high fly ash carbon content and the like are caused by the characteristics of finer gasification fine slag particles, low heat productivity and the like, and the ash particles have short residence time in the boiler, so that the internal circulation of coal gasification particles can not be realized.
2) The pulverized coal boiler is adopted for mixing combustion, and the problems of difficult initial ignition, difficult later combustion, and the like exist due to low volatile content of gasified fine slag, flame-retardant carbon-based solid waste and mixed combustion of gasified ash slag.
3) The new special incinerator has the problems of low burning heat productivity, gasification of fine slag, stable combustion, large design size of a hearth, high initial investment cost and the like.
Disclosure of Invention
The application aims to provide a coal gasification ash incineration system which is used for solving the problems of difficult ignition and difficult burnout of coal gasification ash existing in the prior art.
According to one aspect of embodiments of the present application, there is provided a coal gasification ash incineration system, in some embodiments, comprising:
a grinding device configured to grind coal gasification ash including at least one of gasification fine slag and gasification coarse slag;
a separation device configured to separate off the exhaust gas generated in the process of grinding the coal gasification ash by the grinding device, the separation device comprising an exhaust gas outlet for outputting the exhaust gas;
the combustion furnace comprises a furnace body, a wind box which is arranged on the furnace body and communicated with a waste gas outlet, and a combustor which is arranged on the furnace body and used for igniting coal gasification ash slag separated by the separating device and then conveying the coal gasification ash slag into the furnace body.
In some embodiments, the coal gasification ash incineration system further includes a transfer duct in communication with the combustor to transfer the separated coal gasification ash to the combustor, the transfer duct configured to circulate primary air that transfers and heats the coal gasification ash.
In some embodiments, the coal gasification ash incineration system further includes a heating component disposed on the transfer duct, the heating component configured to heat the primary air flowing through the transfer duct.
In some embodiments, the heating component comprises a heat exchanger comprising a primary air flow channel in communication with the delivery conduit.
In some embodiments, the heat exchanger further comprises a heating medium flow passage in heat exchange relation with the primary air flow passage, the heating medium flow passage being in communication with the flue gas outlet of the furnace body or with a heating steam source.
In some embodiments, the combustion furnace further comprises a steering chamber which is arranged in parallel with the hearth body along the horizontal direction, an inlet which is communicated with the smoke outlet of the hearth body is arranged at the upper end of the steering chamber, and the heating medium flow channel of the heat exchanger is communicated with the steering chamber.
In some embodiments, the combustion furnace further comprises a steering chamber arranged in parallel with the hearth body along the horizontal direction, an inlet communicated with a smoke outlet of the hearth body is arranged at the upper end of the steering chamber, and the heat exchanger is arranged in the steering chamber.
In some embodiments, the coal gasification ash incineration system further includes a transfer conduit in communication with the combustor to transfer the separated coal gasification ash to the combustor, the transfer conduit configured to transfer primary air and coal fines to transfer the coal gasification ash, primary air, and coal fines to the combustor.
In some embodiments, the coal gasification ash incineration system further includes a bin configured to store the coal gasification ash after the exhaust gas is separated, and a transfer conduit communicates with the bin to transfer the coal gasification ash stored in the bin to the combustor.
In some embodiments, the coal gasification ash incineration system further comprises:
a black water tank configured to store gasification fine slag washed out of gas generated by coal gasification;
and the drying device is communicated with the black water tank and is configured to dry the gasified fine slag, and the grinding device grinds the gasified coarse slag and the gasified fine slag dried by the drying device.
In some embodiments, the coal gasification ash incineration system further comprises a hot air duct for delivering dry air to the grinding device, the hot air duct being in communication with the smoke outlet of the furnace body or with a primary air duct of the combustion system.
According to another aspect of the present application, there is also provided a combustion method of the coal gasification ash incineration system, the combustion method comprising:
drying the gasified fine slag;
grinding the dried gasified fine slag and gasified coarse slag;
separating the ground coal gasification ash;
the separated exhaust gas is conveyed to a wind box, and the gasified ash slag after the exhaust gas is separated is heated and then conveyed to a combustor.
In some embodiments, the moisture content of the dried gasified slag is 15% -60%.
In some embodiments, the average particle size of the ground coal gasification ash is less than 20 μm.
In some embodiments of the present application, in some embodiments,
the separated coal gasification ash is stored in a storage bin, and the coal gasification ash in the storage bin is conveyed to a burner or conveyed to a pipeline of primary air and coal dust of a boiler by primary air so as to be conveyed into a hearth body through the pipeline of the primary air and the coal dust.
In some embodiments, the separated coal gasification ash is directly conveyed to the primary air and coal dust pipeline of the boiler for conveying into the hearth body through the primary air and coal dust pipeline.
In some embodiments, the temperature of the primary air that transports the coal gasification ash after the separation of the exhaust gas is 300 ℃ to 800 ℃.
In some embodiments, the coal gasification ash during or after grinding is dried, and the water content of the coal gasification ash after grinding is less than 5%.
In some embodiments, the weight ratio of coal gasification ash to primary wind introduced by the burner is from 0.3 to 1.5.
By adopting the technical scheme, the coal gasification ash is ground and thinned by the grinding device and then is conveyed into the hearth body for combustion, the thinned coal gasification ash increases the specific surface area, increases the contact area of coal nuclei of the coal gasification ash and air, reduces the ignition heat of coal gasification fine slag, reduces the ignition temperature of the coal gasification ash, and improves the burning-out characteristic, so that the problems of difficult ignition and difficult burnout of the coal gasification ash in the prior art are solved.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 illustrates a schematic diagram of a coal gasification ash incineration system according to some embodiments of the present application;
FIG. 2 shows a schematic structural view of a coal gasification ash incineration system according to other embodiments of the present application;
FIG. 3 shows a schematic structural view of a coal gasification ash incineration system according to other embodiments of the present application; and
fig. 4 shows a schematic structural view of a coal gasification ash incineration system according to other embodiments of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Coal gasification ash is a product generated by a series of decomposition and combination reactions of mineral substances in coal in the coal gasification process. The gasification coarse slag is discharged from the slag hole at the bottom of the coal gasification device, and a small amount of particles taken away by the synthetic gas form gasification fine slag through subsequent washing, flash evaporation, filter pressing and other processes. The gasified coarse slag and the gasified fine slag are collectively called coal gasification ash.
In order to fully utilize resources and avoid energy waste, coal gasification ash can be further used as fuel of a boiler, but when the coal gasification ash is used as the fuel of the boiler, the coal gasification ash has the problems of difficult ignition and difficult burnout.
In order to improve the above-described problems, the present embodiment provides a coal gasification ash incineration system, as shown in fig. 1 to 4, which includes a grinding device 4, a separation device 5, and a combustion furnace.
The grinding device 4 is configured to grind coal gasification ash including at least one of gasification fine slag and gasification coarse slag. The separation device 5 is configured to separate off the exhaust gas generated during the coal gasification ash grinding process by the grinding device 4, and the separation device 5 comprises an exhaust gas outlet for outputting the exhaust gas. The combustion furnace comprises a furnace body 10, a wind box 9 which is arranged on the furnace body 10 and is communicated with a waste gas outlet, and a combustor 8 which is arranged on the furnace body 10 and is used for igniting coal gasification ash slag separated by the separating device 5 and then conveying the coal gasification ash slag into the furnace body 10.
In this embodiment, the coal gasification ash is ground and refined by the grinding device 4 and then is conveyed into the hearth body 10 for combustion, the specific surface area of the refined coal gasification ash is increased, the contact area of the carbon core of the coal gasification ash and air is increased, the ignition heat of the coal gasification fine slag is reduced, the ignition temperature of the coal gasification ash is lowered, and the combustion ashes are improved, so that the problems of difficult ignition and difficult burnout of the coal gasification ash in the prior art are solved.
The coal gasification ash incineration system further includes a transfer duct 12 communicating with the combustor 8 to transfer the separated coal gasification ash to the combustor 8, the transfer duct 12 being configured to circulate a primary air for transferring and heating the coal gasification ash. The high-temperature primary air in the conveying pipeline 12 can heat the gasified slag, raise the temperature of the gasified slag, reduce the initial ignition heat of the gasified slag and strengthen the ignition of the gasified slag.
In this embodiment, a dedicated gasification ash burner is used to enhance the burner reflow, enhancing the initial and late burn-out, low NOx combustion characteristics. The special burner adopts a lower primary air nozzle wind speed, a larger flame stabilizing ring structure and a gradation grading device in the burner.
As shown in fig. 1 to 3, the coal gasification ash incineration system further includes a heating part 7 provided on the conveying duct 12, the heating part 7 being configured to heat the primary air flowing through the conveying duct 12. The heating member 7 is located upstream of the burner 8 along the flow path of the primary air. The heating unit 7 is for heating the primary air flowing therethrough so that the primary air heats the coal gasification ash conveyed to the burner 8.
The heating part 7 includes a heat exchanger, and the heat exchanger 7 includes a primary air flow passage communicating with the delivery duct 12. In other alternative embodiments, the heating element 7 comprises a heating wire or a combustion heater.
The heat exchanger 7 further comprises a heating medium flow passage exchanging heat with the primary air flow passage, and the heating medium flow passage is communicated with a smoke outlet of the hearth body 10 or is communicated with a heating steam source.
In some embodiments, the heat exchanger 7 includes a primary air flow channel and a heat exchange medium flow channel for heat exchange of the primary air flow channel, the heat exchange medium flow channel is communicated with the smoke outlet of the hearth body 10, and primary air flowing through the primary air flow channel is heated in the process that high-temperature smoke discharged from the smoke outlet of the hearth body flows through the heat exchange medium flow channel of the heat exchanger 7, see fig. 3.
Specifically, the combustion furnace further comprises a steering chamber 11 which is arranged in parallel with the hearth body 10 along the horizontal direction, an inlet which is communicated with the smoke outlet of the hearth body 10 is arranged at the upper end of the steering chamber 11, and a heating medium flow passage of the heat exchanger 7 is communicated with the steering chamber 11. The high-temperature heat exchanger adopts a bypass arrangement mode, high-temperature flue gas is extracted from the steering chamber and passes through the gas-gas heat exchanger.
In other embodiments, the heat exchange medium flow passage of the heat exchanger medium 7 is in communication with a heating steam source, and the high temperature steam flowing through the heat exchange medium flow passage heats the primary air flowing through the primary air flow passage, and the heat exchanger 7 heats the primary air by using the high temperature steam.
In other embodiments, as shown in fig. 2, the combustion furnace further comprises a diversion chamber 11 which is arranged in parallel with the hearth body 10 along the horizontal direction, an inlet communicated with the smoke outlet of the hearth body 10 is arranged at the upper end of the diversion chamber 11, and a primary air flow channel is arranged in the diversion chamber 11. The primary air flow passage of the heat exchanger 7 is directly arranged in the turning chamber 11, high-temperature flue gas in the turning chamber 11 directly heats one side air in the primary air flow passage, and the heated primary air conveys coal gasification ash to the combustor 8. The high-temperature heat exchanger 7 adopts a high-temperature gas heat exchanger, and the high-temperature gas heat exchanger is arranged at the position of the boiler steering chamber 11.
In other embodiments, as shown in FIG. 4, the transfer duct 12 is configured to transfer primary air and coal fines to transfer coal gasification ash, primary air, and coal fines to the combustor 8. The ground coal gasification ash is conveyed to a primary powder pipe through an air-powder mixing device, and is mixed with the original primary air powder of the boiler and then conveyed to a hearth body. The existing boiler is modified, coal gasification fine slag is mixed and burned, and a special coal gasification fine slag burning boiler can be newly built.
The coal gasification ash incineration system further includes a silo 6 configured to store coal gasification ash after the exhaust gas is separated, and a conveying pipe 12 communicates with the silo 6 to convey the coal gasification ash stored in the silo 6 to the combustor 8. The gasified ash adopts a middle-storage type high-temperature hot air powder feeding mode, the hot air temperature is high, the initial ignition heat of the gasified ash is reduced, and the ignition of the gasified ash is enhanced.
The coal gasification ash incineration system also comprises a black water tank 1 and a drying device 2. The black water tank 1 is configured to store gasification fine slag washed out of gas generated by coal gasification; the drying device 2 is communicated with the black water tank 1 and is configured to dry the gasified fine slag, and the grinding device 4 grinds the gasified coarse slag and the gasified fine slag dried by the drying device 2.
The coal gasification ash incineration system further comprises a first conveying device, wherein the first conveying device is configured to convey gasified fine slag with high water content in the black water tank to the grinding device 4. In some embodiments, the first delivery device comprises a delivery line.
The coal gasification ash incineration system further includes a coarse slag storage device 3 that accommodates the gasified coarse slag, and a second conveying device configured to convey the gasified coarse slag in the coarse slag storage device 3 to the grinding. In some embodiments, the second conveyor comprises a conveyor belt.
In some embodiments, the coal gasification ash incineration system further comprises a hot air duct for delivering dry air to the grinding device 4, which hot air duct communicates with the smoke outlet of the furnace body 10 or with the primary air duct of the combustion system. The drying air of the grinding device adopts high-temperature furnace smoke or hot primary air, and the separated exhaust gas is sent into a hearth.
The gasified fine slag with the water content of more than 80% from the black water tank 1 is pressed and filtered to 15-60% by the drying device 2, and the gasified fine slag and the gasified coarse slag are sent to the grinding device 4, and are ground and dried by the grinding device 5, and then the gasified ash slag is ground into superfine powder with the water content of less than 5%. After passing through the separation device 5, the ground coal gasification ash is separated to the storage bin 6, and the separated exhaust gas is sent to the secondary air box 9. The primary air is heated to 350-800 deg.c by heat exchanger, and the superfine powder gasified slag is fed to the hearth for burning in hot air feeding mode.
According to another aspect of the present application, there is also provided a combustion method of a coal gasification ash incineration system, the combustion method comprising:
drying the gasified fine slag;
grinding the dried gasified fine slag and gasified coarse slag;
separating the ground coal gasification ash;
the separated off-gas is fed to a windbox 9 and the coal gasification ash after the separation of off-gas is fed to a burner 8.
In some embodiments, the moisture content of the dried gasified slag is 15% -60%. The gasification fine slag is dried before grinding, which is beneficial to reducing the granularity of the gasification fine slag after grinding in the grinding process.
In some embodiments, the average particle size of the ground coal gasification ash is less than 20 μm. The gasified ash is ground into superfine powder by the grinding device, the specific surface area of the gasified ash is increased, the contact area of the gasified ash carbon core and air is increased, the ignition heat of gasified fine slag is reduced, the ignition temperature of gasified ash is reduced, and the burning-out characteristic is improved.
In some embodiments, the separated coal gasification ash is stored in the bin 6, and the coal gasification ash in the bin 6 is conveyed to the burner 8 by primary air or conveyed to the primary air and coal dust pipeline of the boiler to be conveyed into the hearth body 10 through the primary air and coal dust pipeline. The gasified ash adopts a middle-storage type high-temperature hot air powder feeding mode, the hot air temperature is high, the initial ignition heat of the gasified ash is reduced, and the ignition of the gasified ash is enhanced.
In some embodiments, the separated coal gasification ash is conveyed directly to the primary air and coal fines duct of the boiler for conveyance into the furnace body 10 via the primary air and coal fines duct.
In some embodiments, the temperature of the primary air that transports the coal gasification ash after the separation of the exhaust gas is 300 ℃ to 800 ℃.
In some embodiments, the coal gasification ash during or after grinding is dried, and the water content of the coal gasification ash after grinding is less than 5%.
The weight ratio of the coal gasification ash introduced by the burner 8 to the primary air is 0.3-1.5. The coal gasification ash adopts a high-concentration powder feeding mode, so that the initial ignition heat is reduced, and the ignition of the gasification ash is enhanced.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, but rather, any modification, equivalent replacement, improvement or the like which comes within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (19)
1. A coal gasification ash incineration system, comprising:
a grinding device (4) configured to grind coal gasification ash including at least one of gasification fine slag and gasification coarse slag;
-a separation device (5) configured to separate off the exhaust gases generated during the grinding of the coal gasification ash by the grinding device (4), the separation device (5) comprising an exhaust gas outlet outputting the exhaust gases;
the combustion furnace comprises a furnace body (10), a wind box (9) which is arranged on the furnace body (10) and communicated with the exhaust gas outlet, and a combustor (8) which is arranged on the furnace body (10) and used for igniting coal gasification ash separated by the separation device (5) and then conveying the coal gasification ash into the furnace body (10).
2. The coal gasification ash incineration system according to claim 1, further comprising a transfer duct (12) in communication with the burner (8) for transferring separated coal gasification ash to the burner (8), the transfer duct (12) being configured to circulate and heat a primary air of the coal gasification ash.
3. The coal gasification ash incineration system according to claim 2, further comprising a heating element (7) provided on the conveying duct (12), the heating element (7) being configured to heat primary air flowing through the conveying duct (12).
4. A coal gasification ash incineration system according to claim 3 characterised in that the heating element (7) comprises a heat exchanger, the heat exchanger (7) comprising a primary air flow channel communicating with the transfer duct (12).
5. The coal gasification ash incineration system according to claim 4, characterized in that the heat exchanger (7) further comprises a heating medium flow channel exchanging heat with the primary air flow channel, which is in communication with the flue gas outlet of the furnace body (10) or with a heating steam source.
6. The coal gasification ash incineration system according to claim 5, wherein the combustion furnace further comprises a steering chamber (11) which is arranged in parallel with the hearth body (10) along the horizontal direction, an inlet which is communicated with a smoke outlet of the hearth body (10) is arranged at the upper end of the steering chamber (11), and a heating medium runner of the heat exchanger (7) is communicated with the steering chamber (11).
7. The coal gasification ash incineration system according to claim 4, characterized in that the combustion furnace further comprises a steering chamber (11) which is arranged in parallel with the hearth body (10) along the horizontal direction, an inlet which is communicated with a smoke outlet of the hearth body (10) is arranged at the upper end of the steering chamber (11), and the heat exchanger (7) is arranged in the steering chamber (11).
8. The coal gasification ash incineration system according to claim 1, further comprising a transfer duct (12) in communication with the combustor (8) for transferring separated coal gasification ash to the combustor (8), the transfer duct (12) being configured to transfer primary air and coal fines for transferring the coal gasification ash, primary air and coal fines to the combustor (8).
9. The coal gasification ash incineration system according to claim 2, further comprising a bin (6) configured to store coal gasification ash after separation of the exhaust gas, the conveying pipe (12) communicating with the bin (6) to convey the coal gasification ash stored in the bin (6) to the burner (8).
10. The coal gasification ash incineration system according to claim 2, further comprising:
a black water tank (1) configured to store the gasification fine slag washed out of the gas generated by coal gasification;
and the drying device (2) is communicated with the black water tank (1) and is configured to dry the gasified fine slag, and the grinding device (4) grinds the gasified coarse slag and the gasified fine slag dried by the drying device (2).
11. The coal gasification ash incineration system according to claim 2, further comprising a hot air duct for delivering dry air to the grinding device (4), which hot air duct communicates with the smoke outlet of the furnace body (10) or with a primary air duct of a combustion system.
12. A method of combustion of a coal gasification ash incineration system according to any one of claims 1 to 11, characterised by comprising:
drying the gasified fine slag;
grinding the dried gasified fine slag and gasified coarse slag;
separating the ground coal gasification ash;
the separated off-gas is conveyed to the wind box (9) and the gasified ash slag after the off-gas is separated is heated and then conveyed to the combustor (8).
13. The combustion method as claimed in claim 12, wherein the moisture content of the gasified fine slag after drying is 15% to 60%.
14. The combustion method according to claim 12, wherein the particle size of the ground coal gasification ash is less than 20 μm.
15. A combustion method as set forth in claim 12, characterized in that,
the separated coal gasification ash is stored in a storage bin (6), and primary air is adopted to convey the coal gasification ash in the storage bin (6) to the burner (8) or to the primary air and coal dust pipeline of the boiler so as to convey the coal gasification ash into the hearth body (10) through the primary air and coal dust pipeline.
16. The combustion method according to claim 12, characterized in that the separated coal gasification ash is directly conveyed to the primary air and coal dust duct of the boiler for conveying into the furnace body (10) via the primary air and coal dust duct.
17. The combustion method according to any one of claims 12 to 15, wherein the temperature of the primary air that transports the coal gasification ash after separation of the exhaust gas is 300 ℃ to 800 ℃.
18. The combustion method according to claim 12, wherein the coal gasification ash is dried during grinding, and the water content of the ground coal gasification ash is less than 5%.
19. The combustion method according to claim 12, characterized in that the weight ratio of the coal gasification ash introduced by the burner (8) to the primary air is 0.3-1.5.
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