CN113108274A - Coal chemical poly-generation coupling semicoke low-NOxSystem and method of combustion - Google Patents
Coal chemical poly-generation coupling semicoke low-NOxSystem and method of combustion Download PDFInfo
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- CN113108274A CN113108274A CN202110316148.6A CN202110316148A CN113108274A CN 113108274 A CN113108274 A CN 113108274A CN 202110316148 A CN202110316148 A CN 202110316148A CN 113108274 A CN113108274 A CN 113108274A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
- F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
- F23C6/047—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
- C10J3/60—Processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/86—Other features combined with waste-heat boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/08—Preparation of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/20—Preheating devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a coal chemical poly-generation coupling semicoke low NOxSystems and methods of combustion. The method comprises the steps of pyrolyzing lignite, collecting pyrolysis gas, tar and blocky semicoke serving as chemical products, and preparing coal water slurry and kerosene water slurry by coupling the powdery semicoke with the additive and the pyrolysis product tar. Then introducing the coal water slurry into the coal water slurryThe gasification furnace is used for preparing gasified gas and obtaining solid waste coal water slurry gasified carbon residue. And introducing the coal water slurry gasified residual carbon into a boiler, arranging kerosene slurry nozzles above and below the coal water slurry gasified residual carbon nozzle, and supporting combustion of the coal water slurry gasified residual carbon by utilizing heat generated by inflammable kerosene slurry. The coal water slurry gasified carbon residue is sent into the boiler by oxygen-enriched primary air. And before the coal water slurry gasification carbon residue is sent into the hearth, tail flue gas is used for preheating, so that the combustion process of the coal water slurry gasification carbon residue can be enhanced. Part of the boil-off gas is then passed to the reburning zone of the boiler. Then oxygen-enriched over-fire air is introduced into the over-fire area of the boiler to ensure that the fuel can be fully combusted in the boiler.
Description
Technical Field
The invention belongs to the technical field of power generation of pulverized coal furnaces of power stations, and particularly relates to coal chemical poly-generation coupling semicoke low-NOxSystems and methods of combustion.
Background
At present, the reserve of brown coal in China is proved to exceed 1000 hundred million tons, and the brown coal is urgently needed to be utilized. However, lignite has a high moisture content, so that direct combustion in utility boilers is difficult. The coal cascade utilization technology is a commonly used technical means aiming at low-rank coal such as brown coal at present, and can effectively realize coal chemical industry poly-generation by utilizing technologies such as coal pyrolysis gasification and the like. Coal pyrolysis technology and coal water slurry gasification technology are effective technical approaches for realizing coal chemical poly-generation, but some industrial byproducts are generated in the production process. The coal water slurry gasification carbon residue is used as a byproduct of the coal water slurry gasification furnace, the content of volatile components is extremely low, and the content of water and carbon is high, so that the coal water slurry gasification carbon residue has certain difficulty in combustion in a power station boiler, but has certain combustion utilization value, and can be considered to be used for combustion power generation in the power station boiler. The kerosene slurry is prepared from lignite pyrolysis product tar and other additives, is used as a combustible liquid fuel, and can effectively support combustion of coal water slurry gasification carbon residue in a boiler, so that the cascade utilization of coal and the coal chemical industry poly-generation can be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a coal chemical poly-generation coupling semicoke low-NOxSystems and methods of combustion.
The invention is realized by adopting the following technical scheme:
coal chemical poly-generation coupling semicoke is lowNOxThe combustion system comprises a pyrolysis furnace, a coal mill, a first coal slurry groove, a second coal slurry groove, a coal water slurry gasification furnace and a boiler body, as well as an ignition area, a reburning area and a burnout area which are arranged on the boiler body from bottom to top; wherein the content of the first and second substances,
carrying out medium-low temperature dry distillation on lignite in a pyrolysis furnace to prepare pyrolysis gas, tar, blocky semicoke and powdery semicoke, wherein the pyrolysis gas, the tar and the blocky semicoke are collected as chemical products; introducing the powdery semi-coke into a coal mill for crushing, and then respectively introducing the powdery semi-coke into a first coal slurry tank and a second coal slurry tank to respectively prepare coal water slurry and kerosene water slurry; gasifying the coal water slurry in a coal water slurry gasification furnace, and burning the obtained coal water slurry gasified carbon residue in a boiler due to high carbon content; in a boiler, the heat generated by burning the kerosene slurry is used for supporting combustion of the coal water slurry gasified carbon residue; part of the gasified gas is introduced into a reburning zone to reach low NOxThe purpose of combustion.
The system is further improved in that the system also comprises a coal water slurry gasified residual carbon drying preheater, a first kerosene slurry nozzle, a coal water slurry gasified residual carbon primary air nozzle and a second kerosene slurry nozzle which are arranged in an ignition zone of the boiler body from bottom to top, and the coal water slurry gasified residual carbon is dried and preheated in the coal water slurry gasified residual carbon drying preheater by utilizing the heat of tail flue gas; in a boiler ignition area, a coal water slurry gasified carbon residue primary air nozzle is arranged between a first kerosene slurry nozzle and a second kerosene slurry nozzle, and the heat of combustion of the kerosene slurry is utilized to support combustion of the coal water slurry gasified carbon residue.
The invention has the further improvement that preheated coal water slurry gasified residual carbon is fed into an ignition area of the boiler through a coal water slurry gasified residual carbon primary air nozzle by utilizing oxygen-enriched primary air, so that the coal water slurry gasified residual carbon is better ignited in the ignition area, and the boiler has higher combustion efficiency.
The further improvement of the invention is that the powdery semicoke is crushed in a coal mill, coal water slurry gasification carbon residue is prepared in a first coal slurry groove, and part of tar prepared by a pyrolysis furnace is introduced into a second coal slurry groove to prepare kerosene water slurry with better combustion characteristic so as to support combustion in a boiler.
The system is further improved in that the system also comprises a gasified gas nozzle arranged in a reburning zone of the boiler body, and the prepared coal water slurry is introduced into the coal water slurry gasification furnace to generate gasified gas and coal water slurry gasified carbon residue; part of gasified gas is introduced into a boiler reburning zone through a gasified gas nozzle so as to realize low NO of the boilerxBurning, and collecting the rest gasified gas as a chemical product.
A further development of the invention is that the system also comprises overfire air jets arranged in the burnout zone of the boiler body.
The system is further improved in that the system also comprises a blower and an air preheater in a tail flue gas pipeline of the boiler body, and oxygen-enriched primary air, secondary air and oxygen-enriched over-fire air which are sent by the blower are heated by the air preheater.
The further improvement of the invention is that the system also comprises a flue gas dust remover, an induced draft fan and a chimney which are sequentially communicated with the tail flue gas pipeline of the boiler body.
Coal chemical poly-generation coupling semicoke low-NOxA method of combustion, comprising:
through the coupling of the pyrolysis furnace, the coal water slurry gasification furnace and the boiler body, various industrial products such as semi-coke are produced at the same time;
the heat of the combustion of the kerosene water slurry is utilized to support combustion of the gasified residual carbon of the coal water slurry, and simultaneously part of gasified gas is used as reburning fuel to be introduced into a reburning area, so that the high efficiency and low NO of the boiler are achievedxThe purpose of combustion;
preheating and drying the coal water slurry gasification carbon residue by utilizing the heat of the tail flue gas so as to realize the high-efficiency combustion of the coal water slurry gasification carbon residue in a boiler;
the preheated coal water slurry gasified carbon residue is sent to the ignition area of the boiler by using the oxygen-enriched primary air, and the oxygen-enriched burnout air is introduced into the burnout area of the boiler, so that the combustion efficiency of the boiler is improved.
The invention has at least the following beneficial technical effects:
the invention provides a coal chemical poly-generation coupling semicoke low-NOxSystem and method for combustion of lignite by pyrolysis of the productsPyrolysis gas, tar and blocky semicoke are collected as chemical products, and coal water slurry and kerosene water slurry are prepared by the powdery semicoke coupling additive and the pyrolysis product tar. Then the coal water slurry is introduced into a coal water slurry gasification furnace to prepare gasification gas, and solid waste coal water slurry gasification carbon residue is obtained. And introducing the coal water slurry gasified residual carbon into a boiler, arranging kerosene slurry nozzles above and below the coal water slurry gasified residual carbon nozzle, and supporting combustion of the coal water slurry gasified residual carbon by utilizing heat generated by inflammable kerosene slurry. Oxygen-enriched primary air is fed into the boiler to feed the coal water slurry gasified carbon residue into the boiler, and the high oxygen concentration can improve the combustion characteristic of the coal water slurry gasified carbon residue. And before the coal water slurry gasification carbon residue is sent into the hearth, tail flue gas is used for preheating, so that the combustion process of the coal water slurry gasification carbon residue can be enhanced. Then part of the gasified gas is introduced into a reburning zone of the boiler to reduce nitrogen oxides generated in the burning process. Then oxygen-enriched over-fire air is introduced into the over-fire area of the boiler to ensure that the fuel can be fully combusted in the boiler. The invention couples the coal cascade utilization and the coal chemical poly-generation, not only realizes the production of chemical products such as semicoke and the like, but also treats the coal water slurry gasification carbon residue of solid wastes, improves the industrial production efficiency, and further realizes the efficient clean utilization of low-rank coal.
In conclusion, the pyrolysis furnace, the coal water slurry gasification furnace and the boiler body are coupled into an industrial system, so that industrial products such as pyrolysis gas, tar, blocky semicoke, gasified gas, electric energy and the like can be produced, the chemical poly-generation is realized, and the high efficiency and the low NO of the boiler are realized by adjusting the air distribution and the combustion of the boilerxAnd (4) burning.
Drawings
FIG. 1 shows that the coal chemical industry poly-generation coupling semicoke is low in NOxSystem schematic of combustion.
Description of reference numerals:
the system comprises a pyrolysis furnace 1, a coal mill 2, a first coal slurry tank 3, a second coal slurry tank 4, a coal water slurry gasification furnace 5, a coal water slurry gasification residual carbon drying preheater 6, a first kerosene water slurry nozzle 7, a coal water slurry gasification residual carbon primary air nozzle 8, a second kerosene water slurry nozzle 9, a gasification gas nozzle 10, an over-fire air nozzle 11, an air preheater 12, a blower 13, a flue gas dust remover 14, an induced draft fan 15, a chimney 16 and a boiler body 17.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention provides a coal chemical poly-generation coupling semicoke low-NOxThe system of burning, including pyrolysis oven 1, coal pulverizer 2, first coal slurry groove 3, second coal slurry groove 4, coal slurry gasifier 5, coal slurry gasification residual carbon dry preheater 6, first kerosene water slurry spout 7, coal slurry gasification residual carbon primary air spout 8, second kerosene water slurry spout 9, gasification gas spout 10, burn out air spout 11, air heater 12, forced draught blower 13, flue gas dust remover 14, draught fan 15, chimney 16 and boiler body 17 to and the boiler ignition zone, reburning zone and the burn out zone of arranging from bottom to top at boiler body 17.
The method comprises the following steps of (1) carrying out medium-low temperature dry distillation on lignite in a pyrolysis furnace 1 to prepare pyrolysis gas, tar, blocky semicoke and powdery semicoke, wherein the pyrolysis gas, the tar and the blocky semicoke are collected as chemical products; introducing the powdery semi-coke into a coal mill 2 for crushing, and then respectively introducing the powdery semi-coke into a first coal slurry tank 3 and a second coal slurry tank 4 to respectively prepare coal water slurry and kerosene water slurry; the coal water slurry can be gasified in the coal water slurry gasification furnace 5, and the obtained coal water slurry gasification carbon residue can be combusted and utilized in a boiler due to high carbon content; in a boiler, the heat generated by burning the kerosene slurry is used for supporting combustion of the coal water slurry gasified carbon residue; part of the gasified gas is introduced into a reburning zone to reach low NOxThe purpose of combustion; the pyrolysis furnace 1, the coal water slurry gasification furnace 5 and the boiler body 17 are coupled into an industrial system, industrial products such as pyrolysis gas, tar, blocky semicoke, gasified gas, electric energy and the like can be produced, chemical poly-generation is realized, and high efficiency and low NO of the boiler are also realized by adjusting air distribution and combustion of the boilerxAnd (4) burning.
Preferably, a first kerosene slurry nozzle 7, a coal water slurry gasified carbon residue primary air nozzle 8 and a second kerosene slurry nozzle 9 are arranged from bottom to top in an ignition zone of the boiler body 17, a gasified air nozzle 10 is arranged in a reburning zone of the boiler body 17, and an overfire air nozzle 11 is arranged in an overfire zone of the boiler body 17.
Preferably, the coal water slurry gasification carbon residue is dried and preheated in the coal water slurry gasification carbon residue drying preheater 6 by utilizing the heat of the tail flue gas; in a boiler ignition area, a coal water slurry gasified residual carbon primary air nozzle 8 is arranged between a first kerosene slurry nozzle 7 and a second kerosene slurry nozzle 9, and the coal water slurry gasified residual carbon is supported by combustion of heat of kerosene slurry combustion.
Preferably, the powdery semi-coke is crushed in a coal mill 2, coal water slurry gasification carbon residue is prepared in a first coal slurry tank 3, and part of tar prepared by the pyrolysis furnace 1 is introduced into a second coal slurry tank 4 to prepare kerosene water slurry with good combustion characteristics so as to support combustion in a boiler for the coal water slurry gasification carbon residue.
Preferably, the prepared coal water slurry is introduced into a coal water slurry gasification furnace 5, and gasification gas and coal water slurry gasification carbon residue are generated; part of gasified gas is introduced into a reburning zone of the boiler through a gasified gas nozzle 10 to realize low NO of the boilerxBurning, and collecting the rest gasified gas as a chemical product.
Preferably, the preheated coal water slurry gasified residual carbon is fed into the ignition area of the boiler through the coal water slurry gasified residual carbon primary air nozzle 8 by utilizing the oxygen-enriched primary air, so that the coal water slurry gasified residual carbon can be better ignited in the ignition area, and the boiler has higher combustion efficiency.
Preferably, the pyrolysis furnace 1, the coal water slurry gasification furnace 5 and the boiler body 17 are organically coupled into a chemical poly-generation industrial system, and industrial products such as pyrolysis gas, tar, blocky semi-coke, gasification gas, electric energy, steam and the like can be produced.
Referring to fig. 1, the invention provides a system of coal chemical poly-generation coupling semicoke low NOxA method of combustion, comprising:
a set of chemical poly-generation system is formed, and various industrial products such as semi-coke and the like can be produced simultaneously through the coupling of the pyrolysis furnace 1, the coal water slurry gasification furnace 5 and the boiler body 17;
the heat of the combustion of the kerosene water slurry is utilized to support combustion of the gasified residual carbon of the coal water slurry, and simultaneously part of gasified gas is used as reburning fuel to be introduced into a reburning area, so that the high efficiency and low NO of the boiler are achievedxThe purpose of combustion;
preheating and drying the coal water slurry gasification carbon residue by utilizing the heat of the tail flue gas so as to realize the high-efficiency combustion of the coal water slurry gasification carbon residue in a boiler;
the preheated coal water slurry gasified carbon residue is sent to an ignition area of the boiler by using the oxygen-enriched primary air, and the oxygen-enriched burnout air is introduced into the boiler burnout area, so that the combustion efficiency of the boiler can be improved.
The above description is only for the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and other modifications or equivalent substitutions made by the technical solution of the present invention by the ordinary skilled in the art should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (9)
1. Coal chemical poly-generation coupling semicoke low-NOxThe combustion system is characterized by comprising a pyrolysis furnace (1), a coal mill (2), a first coal slurry tank (3), a second coal slurry tank (4), a coal water slurry gasification furnace (5) and a boiler body (17), and an ignition area, a reburning area and a burnout area which are arranged on the boiler body (17) from bottom to top; wherein the content of the first and second substances,
carrying out medium-low temperature dry distillation on lignite in a pyrolysis furnace (1) to prepare pyrolysis gas, tar, blocky semicoke and powdery semicoke, wherein the pyrolysis gas, the tar and the blocky semicoke are collected as chemical products; introducing the powdery semi-coke into a coal mill (2) for crushing, and then respectively introducing into a first coal slurry tank (3) and a second coal slurry tank (4) to respectively prepare coal water slurry and kerosene water slurry; the coal water slurry is gasified in a coal water slurry gasification furnace (5), and the obtained coal water slurry gasification carbon residue is combusted and utilized in a boiler due to high carbon content; in a boiler, the heat generated by burning the kerosene slurry is used for supporting combustion of the coal water slurry gasified carbon residue; part of the gasified gas is introduced into a reburning zone to reach low NOxThe purpose of combustion.
2. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 1xThe combustion system is characterized by also comprising a coal water slurry gasification carbon residue drying preheater6) A first kerosene slurry nozzle (7), a coal water slurry gasified carbon residue primary air nozzle (8) and a second kerosene slurry nozzle (9) which are arranged from bottom to top in an ignition area of the boiler body (17), and the coal water slurry gasified carbon residue is dried and preheated in a coal water slurry gasified carbon residue drying preheater (6) by utilizing the heat of tail flue gas; in a boiler ignition area, a coal water slurry gasified carbon residue primary air nozzle (8) is arranged between a first kerosene slurry nozzle (7) and a second kerosene slurry nozzle (9), and the coal water slurry gasified carbon residue is supported by combustion of heat of kerosene slurry combustion.
3. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 2xThe combustion system is characterized in that preheated coal water slurry gasification carbon residue is fed into a boiler ignition area through a coal water slurry gasification carbon residue primary air nozzle (8) by utilizing oxygen-enriched primary air, so that the coal water slurry gasification carbon residue is better ignited in the ignition area, and the boiler has higher combustion efficiency.
4. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 1xThe combustion system is characterized in that powdery semicoke is crushed in a coal mill (2), coal water slurry gasification residual carbon is prepared in a first coal slurry groove (3), and part of tar prepared by a pyrolysis furnace (1) is introduced into a second coal slurry groove (4) to prepare kerosene water slurry with better combustion characteristics so as to support combustion in a boiler for the coal water slurry gasification residual carbon.
5. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 1xThe system for combustion is characterized by also comprising a gasified gas nozzle (10) arranged in a reburning zone of the boiler body (17), and the prepared coal water slurry is introduced into the coal water slurry gasification furnace (5) to generate gasified gas and coal water slurry gasified carbon residue; part of the gasified gas is introduced into a reburning zone of the boiler through a gasified gas nozzle (10) to realize low NO of the boilerxBurning, and collecting the rest gasified gas as a chemical product.
6. The coal chemical poly-generation coupling of claim 1Semicoke low NOxThe system of combustion is characterized in that the system further comprises an overfire air nozzle (11) arranged in the overfire zone of the boiler body (17).
7. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 1xThe combustion system is characterized by further comprising a blower (13) and an air preheater (12) in a tail flue gas pipeline of the boiler body (17), wherein oxygen-enriched primary air, secondary air and oxygen-enriched over-fire air sent by the blower (13) are heated by the air preheater (12).
8. The coal chemical poly-generation coupling semicoke low-NO device as claimed in claim 1xThe combustion system is characterized by further comprising a flue gas dust collector (14), an induced draft fan (15) and a chimney (16), wherein the flue gas dust collector is sequentially communicated with a tail flue gas pipeline of the boiler body (17).
9. Coal chemical industry poly-generation coupling semicoke low-NO system of any one of claims 1 to 8xA method of combustion, comprising:
various industrial products such as semi-coke are produced simultaneously through the coupling of the pyrolysis furnace (1), the coal water slurry gasification furnace (5) and the boiler body (17);
the heat of the combustion of the kerosene water slurry is utilized to support combustion of the gasified residual carbon of the coal water slurry, and simultaneously part of gasified gas is used as reburning fuel to be introduced into a reburning area, so that the high efficiency and low NO of the boiler are achievedxThe purpose of combustion;
preheating and drying the coal water slurry gasification carbon residue by utilizing the heat of the tail flue gas so as to realize the high-efficiency combustion of the coal water slurry gasification carbon residue in a boiler;
the preheated coal water slurry gasified carbon residue is sent to the ignition area of the boiler by using the oxygen-enriched primary air, and the oxygen-enriched burnout air is introduced into the burnout area of the boiler, so that the combustion efficiency of the boiler is improved.
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2021
- 2021-03-24 CN CN202110316148.6A patent/CN113108274B/en active Active
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| CN101914401A (en) * | 2010-08-31 | 2010-12-15 | 中国矿业大学(北京) | Method for preparing gasified coal water slurry by utilizing lignite |
| JP6199174B2 (en) * | 2013-12-13 | 2017-09-20 | 三菱日立パワーシステムズ株式会社 | Boiler equipment |
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