CN111473325B - O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxSystem and method for co-firing - Google Patents

O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxSystem and method for co-firing Download PDF

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CN111473325B
CN111473325B CN202010305221.5A CN202010305221A CN111473325B CN 111473325 B CN111473325 B CN 111473325B CN 202010305221 A CN202010305221 A CN 202010305221A CN 111473325 B CN111473325 B CN 111473325B
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combustion
air
carbon residue
boiler
flue gas
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CN111473325A (en
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王长安
王超伟
冯芹芹
王鹏乾
杜勇博
车得福
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • 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
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/04—Heating fuel prior to delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/102—Stationary cabinets
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/10—Furnace staging
    • F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F23K2201/1003—Processes to make pulverulent fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/50—Blending
    • F23K2201/501—Blending with other fuels or combustible waste
    • 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 method for preparing O2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxA system and method for co-firing. The invention utilizes the dried lignite and the coal water slurry gasification carbon residue to carry out O in a power station boiler2/H2O mixed combustion is carried out, so that the air distribution mode in the boiler is optimized, and NO at the outlet of the boiler can be reducedxThe discharge amount can also effectively utilize lignite and coal water slurry gasification carbon residue which have higher moisture content and are difficult to directly utilize. LNG gasification is utilized to provide cold energy for cryogenic air separation equipment, and then oxygen is prepared. Heating water obtained after lignite and coal water slurry gasification carbon residue are dried into steam by using high-temperature flue gas, and carrying out O treatment in a furnace2/H2And (4) combusting the oxygen. And preheating the dried gasified carbon residue by using the flue gas to strengthen the combustion of the gasified carbon residue in the furnace. The cold energy generated during the gasification of oxygen and nitrogen in the cryogenic air separation system is utilized to collect the moisture in the flue gas, and then the flue gas is heated to steam and utilized in the system, so that the energy utilization efficiency of the system is improved, and the white visual pollution in the flue gas is eliminated.

Description

O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxSystem and method for co-firing
Technical Field
The invention belongs to the technical field of power generation of a pulverized coal furnace of a power station, and particularly relates to O2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxA system and method for co-firing.
Background
China has found that the storage capacity of lignite exceeds 1000 hundred million tons at present, but the lignite is difficult to be directly combusted and utilized in a boiler due to high moisture content, so that the lignite is dried at present and then put into the boiler for combustion. The coal water slurry gasification carbon residue is a byproduct of a coal water slurry gasification furnace, is solid waste with great application prospect, and has higher and higher yield with the continuous development of the coal chemical industry. The water content and carbon content of the coal water slurry gasification carbon residue are high, but the volatile content is low, and the coal water slurry gasification carbon residue is difficult to directly burn in a boiler, so that the coal water slurry gasification carbon residue can be burnt and utilized in the boiler after being dried. The lignite is low in nitrogen content but high in volatile component content, is mixed with the coal water slurry gasified carbon residue to be burnt in a power station boiler, and is an important way for realizing clean and efficient utilization of the lignite and recycling of solid waste.
O2/H2Oxygen-enriched combustion of O, with conventional O2/CO2Compared with oxygen-enriched combustion, the flue gas circulating system is reduced, and the complexity of the system is reduced; at O2/H2In the O combustion process, there is NO flue gas recirculation process, thus reducing NOxAnd SOxThe generation of impurity gases, and the main product after combustion is H2O and CO2All in favor of CO2The purification process of (1). In addition, in O2/H2O combustion process, since there is NO nitrogen, does not generate thermal NOxOnly fuel type NO is generatedxFor reducing NO in coal-fired utility boilersxThe discharge has a profound significance.
O for realizing lignite and coal water slurry gasification carbon residue in coal-fired power station boiler2/H2The combustion of O combines the characteristics of low nitrogen content and high volatile content of lignite, not only can realize the utilization of solid wastes such as coal water slurry gasification carbon residue, but also can further reduce NO of a coal-fired boilerxAnd (4) discharging the amount. Is beneficial to realizing the cascade utilization of coal and the high-efficiency clean utilization of high-water-content solid waste in China.
Disclosure of Invention
The invention aims to provide O2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxA system and method for co-firing. The invention utilizes the dried lignite and the coal water slurry gasification carbon residue to carry out O in a power station boiler2/H2O mixed combustion, thereby optimizing the air distribution mode in the furnace withoutOnly the NO at the boiler outlet can be reducedxThe discharge amount can also effectively utilize lignite and coal water slurry gasification carbon residue which have higher moisture content and are difficult to directly utilize. LNG gasification is utilized to provide cold energy for cryogenic air separation equipment, and then oxygen is prepared. Heating water obtained after lignite and coal water slurry gasification carbon residue are dried into steam by using high-temperature flue gas, and carrying out O treatment in a furnace2/H2And (4) combusting the oxygen. And preheating the dried gasified carbon residue by using the flue gas to strengthen the combustion of the gasified carbon residue in the furnace. The cold energy generated during the gasification of oxygen and nitrogen in the cryogenic air separation system is utilized to collect the moisture in the flue gas, and then the flue gas is heated to a steam state and utilized in the system, so that the energy utilization efficiency of the system is improved, and the white visual pollution in the flue gas is eliminated. Coupling the energy and matter in the LNG plant, lignite drying system and utility boilers both utilizes the nonflammable fuels and improves the efficiency of industrial production.
The invention is realized by adopting the following technical scheme:
o-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxThe blending combustion system comprises an LNG gasification station, a cryogenic air separation plant, a first flue gas condenser, a first water collector, a first coal bunker, a coal pulverizer, a first drying collection box, a second coal bunker, a second drying collection box, a tubular preheater, a burnout fan, a primary fan, a secondary fan, a first draught fan, a second flue gas condenser, a second water collector and a boiler body, as well as an ignition area, a main combustion 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,
a first brown coal inlet, a gasification carbon residue inlet and a second brown coal inlet are arranged on the side wall of the boiler body in the ignition area from bottom to top, a hot air inlet is arranged on the side wall of the boiler body in the main combustion area, and an over-fire air inlet is arranged on the side wall of the boiler body in the over-fire area; the first air preheater and the second air preheater are arranged in a tail flue of the boiler body from inside to outside, oxygen-enriched primary air and secondary air are preheated by the first air preheater after passing through a first induced draft fan, and then the primary air and the secondary air enter an ignition area and a main combustion area through a first lignite inlet, a gasification carbon residue inlet, a second lignite inlet and a hot air inlet; the pure oxygen over-fire air is preheated by a second air preheater after passing through a second induced draft fan, and then enters the over-fire area through an over-fire air inlet;
liquefied natural gas of an LNG (liquefied natural gas) gasification station is used for providing cold energy for producing pure oxygen for a cryogenic air separation plant, and then the liquid nitrogen and the cold energy generated in liquid oxygen gasification are used for condensing and drying smoke generated after lignite and coal water slurry gasify carbon residue and moisture in tail smoke to form O in a boiler body2/H2In the O combustion atmosphere, lignite enters a coal mill from a first coal bunker, is ground into powder and then enters a first drying collection box, and coal water slurry gasified carbon residue enters a second drying collection box from a second coal bunker; the tail flue gas is used for drying lignite and coal water slurry gasified residual carbon in a first drying collection box and a second drying collection box respectively, and meanwhile, the dried gasified residual carbon is preheated in a tubular preheater and then is introduced into a boiler to strengthen the combustion; the method is characterized in that cold energy generated during gasification of liquid oxygen and liquid nitrogen is respectively utilized to condense smoke coming out of a tubular preheater and smoke in front of a smoke dust remover in a first smoke condenser and a second smoke condenser, condensed water is respectively collected in a first water collector and a second water collector and finally collected to the first water collector, high-temperature smoke is utilized to supply heat to a steam state for water in the first water collector, and the high-temperature smoke is combined with gasified pure oxygen to form oxygen-enriched primary air, secondary air and pure oxygen over-fire air, the oxygen-enriched primary air, the secondary air and the pure oxygen over-fire air are respectively led out by a primary air fan, a secondary air fan and the over-fire air fan to be sent into a boilerxThe amount of production.
The invention has the further improvement that the invention also comprises a flue gas dust remover and a chimney, and condensed flue gas is dedusted in the flue gas dust remover (25) and finally discharged from the chimney.
Lignite and gasified carbon residue O2/H2A method of O-combustion comprising:
(1) drying lignite and coal water slurry gasified carbon residue by utilizing tail flue gas, collecting dried water, and forming O in a furnace2/H2O combustion atmosphere;
(2) condensing and collecting moisture in the flue gas by using cold energy generated during gasification of liquid nitrogen and liquid oxygen;
(3) preheating gasified carbon residue by utilizing tail flue gas to strengthen the combustion process;
(4) the gasification carbon residue inlet is arranged between the first lignite inlet and the second lignite inlet, and the gasification carbon residue is assisted by the characteristic of high volatile content of lignite to combust gas, so that the combustion process of an ignition area is strengthened;
(5) the water in the first water collector is heated to be in a steam state by utilizing high-temperature flue gas, and then is mixed with pure oxygen and sent into the furnace for combustion, so that the air distribution mode is optimized.
Lignite-doped gasified carbon residue coupling low NO of power station boilerxA method of combustion, comprising:
(1) formation of O in a boiler2/H2O combustion, reduced NO in boilerxDischarging;
(2) the pure oxygen and the water vapor are mixed into oxygen-enriched primary air, secondary air and pure oxygen over-fire air, so that the combustion of fuel in the boiler is enhanced, and NO at the outlet of the boiler is reducedxDischarging;
(3) the oxygen-enriched primary air, the secondary air and the pure oxygen over-fire air are preheated in the first air preheater and the second air preheater, so that the combustion efficiency of the boiler is improved;
(4) the oxygen proportion in the oxygen-enriched primary air and the secondary air is adjusted according to the requirement, and the low NO isxThe temperature of the hearth can be adjusted while the combustion is carried out.
The invention provides a coupling brown coal and gasified carbon residue O2/H2O low NOxThe system and the method for mixed combustion have the following beneficial technical effects:
(1) the water obtained after lignite and coal water slurry gasification carbon residue drying and the water obtained after tail flue gas condensation are utilized to realize O in the furnace2/H2Combustion of O, beneficial to reduction of NOxDischarging;
(2) the lignite with high volatile content and the coal water slurry gasification carbon residue are mixed and combusted, and the gasification carbon residue is preheated by using flue gas before entering a hearth, so that the combustion is facilitated;
(3) oxygen-enriched primary air, secondary air and pure oxygen over-fire air are formed by pure oxygen and water vapor, so that the air distribution mode is optimized, the ignition and combustion of lignite and gasified carbon residue are facilitated, and the NO reduction of a boiler is facilitatedxDischarge capacity;
(4) the cold energy generated during LNG gasification is utilized to prepare liquid oxygen and liquid nitrogen in a cryogenic air separation device, so that the efficiency and the energy utilization rate of industrial production are improved;
(5) the water in the flue gas is condensed and collected by utilizing the cold energy of the liquid oxygen and the liquid nitrogen, and the collected water can be sent into a hearth for O2/H2The white visual pollution can be eliminated by utilizing the combustion of O.
Drawings
FIG. 1 is a drawing of O according to the present invention2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxThe system schematic diagram of the mixed burning.
Description of reference numerals:
the system comprises an LNG gasification station 1, a cryogenic air separation plant 2, a first flue gas condenser 3, a first water collector 4, a first coal bunker 5, a coal mill 6, a first drying header 7, a second coal bunker 8, a second drying header 9, a tubular preheater 10, a burnout fan 11, a primary fan 12, a secondary fan 13, a first lignite inlet 14, a gasification carbon residue inlet 15, a second lignite inlet 16, a hot air inlet 17, an overfire air inlet 18, a first air preheater 19, a second air preheater 20, a first draught fan 21, a second draught fan 22, a second flue gas condenser 23, a second water collector 24, a flue gas dust collector 25, a chimney 26 and a boiler body 27.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to FIG. 1, the invention provides an O2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxThe blending combustion system comprises an LNG (liquefied natural gas) gasification station 1, a cryogenic air separation plant 2, a first flue gas condenser 3, a first water collector 4, a first coal bunker 5, a coal mill 6, a first drying header 7, a second coal bunker 8, a second drying header 9, a tubular preheater 10, a burnout fan 11, a primary air fan 12, a secondary air fan 13, a first lignite inlet 14, a gasification residual carbon inlet 15, a second lignite inlet 16, a hot air inlet 17, a burnout air inlet 18, a first air preheater 19, a second air preheater 20, a first induced draft fan 21, a second induced draft fan 22, a second air preheater 19, a second air preheater 20The flue gas condenser 23, the second water collector 24, the flue gas dust remover 25, the chimney 26 and the boiler body 27, as well as the boiler ignition zone, the main combustion zone and the burnout zone which are arranged from bottom to top; wherein the content of the first and second substances,
the liquefied natural gas of the LNG gasification station 1 is gasified to provide cold energy for producing pure oxygen for the cryogenic air separation device 2, then the liquid nitrogen and the cold energy in the liquid oxygen gasification are utilized to condense, dry and preheat the smoke of lignite and coal water slurry gasification carbon residue and the moisture in the tail smoke, and O is formed in the boiler body 272/H2And (3) O combustion atmosphere, preheating the dried gasified carbon residue in a tubular preheater 10, and then introducing the preheated gasified carbon residue into a boiler to strengthen the combustion.
Further, lignite enters a coal mill 6 from a first coal bunker 5, is ground into powder and then enters a first drying collection box 7, and coal water slurry gasification carbon residue enters a second drying collection box 9 from a second coal bunker 8. The tail flue gas is used for drying the lignite and the coal water slurry gasified residual carbon in the first drying header 7 and the second drying header 9 respectively, and the dried flue gas is introduced into the tubular preheater 10 to preheat the gasified residual carbon so as to strengthen the combustion process in the furnace.
Further, the flue gas coming out of the tubular preheater 10 and the flue gas in front of the flue gas dust collector 25 are condensed in the first flue gas condenser 3 and the second flue gas condenser 23 by using cold energy generated when liquid oxygen and liquid nitrogen are gasified, and the condensed water is collected in the first water collector 4 and the second water collector 24 respectively and finally collected to the first water collector 4.
Further, high-temperature flue gas is used for supplying heat to the water in the first water collector 4 to a steam state, and is combined with gasified pure oxygen to form oxygen-enriched primary air, secondary air and pure oxygen burnout air which are respectively led out by the primary air fan 12, the secondary air fan 13 and the burnout air fan 11 and are sent into the boiler, so that the optimized air distribution reduces NO in the boilerxThe amount of the generated gas is finally removed in a gas dust remover 25 and finally discharged from a chimney 26.
Further, in the boiler, the gasification carbon residue inlet 15 is arranged between the first lignite inlet 14 and the second lignite inlet 16, and the gasification carbon residue is assisted by utilizing the characteristic of high volatile components of lignite, so that the combustion process of an ignition area is enhanced.
Further, preheating oxygen-enriched primary air and secondary air by using a first air preheater 19, and then enabling the primary air and the secondary air to enter an ignition area and a main combustion area through a first lignite inlet 14, a gasification carbon residue inlet 15, a second lignite inlet 16 and a hot air inlet 17; the second air preheater 20 preheats pure oxygen overfire air, which enters the overfire zone through the overfire air inlet 18.
Further, the cold energy generated during the gasification of the nitrogen prepared by the liquid nitrogen is utilized to condense the high-temperature flue gas discharged from the first water collector 4, and the collected water is used for O2/H2And combusting O, and simultaneously preparing high-purity nitrogen for industrial production.
Referring to fig. 1, the brown coal and gasified residual carbon O provided by the present invention2/H2A method of O-combustion comprising:
(1) drying lignite and coal water slurry gasified carbon residue by utilizing tail flue gas, collecting dried water, and forming O in a furnace2/H2O combustion atmosphere;
(2) condensing and collecting moisture in the flue gas by using cold energy generated during gasification of liquid nitrogen and liquid oxygen;
(3) preheating gasified carbon residue by using the dried flue gas to strengthen the combustion process;
(4) the gasification carbon residue inlet 15 is arranged between the first lignite inlet 14 and the second lignite inlet 16, and the gasification carbon residue is assisted by the characteristic of high volatile content of lignite to combust gas, so that the combustion process of an ignition area is enhanced;
(5) the water in the first water collector 4 is heated to be in a steam state by utilizing high-temperature flue gas, then is mixed with pure oxygen and is sent into the furnace for combustion, and the air distribution mode is optimized.
Referring to fig. 1, the lignite-doped gasified carbon residue coupling low-NO power station boiler provided by the inventionxA method of combustion, comprising:
(1) formation of O in a boiler2/H2The combustion of O can effectively reduce NO of the boilerxDischarging;
(2) the pure oxygen and the water vapor are mixed into oxygen-enriched primary air, secondary air and pure oxygen over-fire air, so that the combustion of fuel in the boiler is enhanced, and NO at the outlet of the boiler is reducedxDischarging;
(3) the oxygen-enriched primary air, the secondary air and the pure oxygen over-fire air are preheated in the first air preheater 19 and the second air preheater 20, so that the combustion efficiency of the boiler is improved;
(4) the oxygen proportion in the oxygen-enriched primary air and the secondary air can be adjusted according to the requirement, and the low NO isxThe temperature of the hearth can be adjusted while the furnace is burning.
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 (4)

1. O-shaped catalyst2/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxThe blending combustion system is characterized by comprising an LNG gasification station (1), a cryogenic air separation plant (2), a first flue gas condenser (3), a first water collector (4), a first coal bunker (5), a coal mill (6), a first drying header (7), a second coal bunker (8), a second drying header (9), a tubular preheater (10), a burnout fan (11), a primary fan (12), a secondary fan (13), a first induced draft fan (21), a second induced draft fan (22), a second flue gas condenser (23), a second water collector (24) and a boiler body (27), as well as an ignition area, a main combustion area and a burnout area which are arranged on the boiler body (27) from bottom to top; wherein the content of the first and second substances,
a first brown coal inlet (14), a gasification carbon residue inlet (15) and a second brown coal inlet (16) are arranged on the side wall of the boiler body (27) in the ignition zone from bottom to top, a hot air inlet (17) is arranged on the side wall of the boiler body (27) in the main combustion zone, and an over-fire air inlet (18) is arranged on the side wall of the boiler body (27) in the over-fire zone; the first air preheater (19) and the second air preheater (20) are arranged in a tail flue of the boiler body (27) from top to bottom, oxygen-enriched primary air and secondary air are preheated by the first air preheater (19) after passing through a first induced draft fan (21), and then the primary air and the secondary air enter an ignition area and a main combustion area through a first lignite inlet (14), a gasification carbon residue inlet (15), a second lignite inlet (16) and a hot air inlet (17); the pure oxygen over-fire air is preheated by a second air preheater (20) after passing through a second induced draft fan (22), and then enters the over-fire area through an over-fire air inlet (18);
liquefied natural gas of an LNG (liquefied natural gas) gasification station (1) is used for providing cold energy for producing pure oxygen for a cryogenic air separation device (2), and then liquid nitrogen and cold energy generated in liquid oxygen gasification are utilized to condense and dry smoke generated after lignite and coal water slurry gasified carbon residue and moisture in tail smoke to form O in a boiler body (27)2/H2In the O combustion atmosphere, lignite enters a coal mill (6) from a first coal bunker (5), is ground into powder, then enters a first drying collection box (7), and coal water slurry gasification carbon residue enters a second drying collection box (9) from a second coal bunker (8); the tail flue gas is used for drying lignite and coal water slurry gasified residual carbon in a first drying header (7) and a second drying header (9) respectively, and the dried gasified residual carbon is preheated in a tubular preheater (10) and then is introduced into a boiler to strengthen the combustion; the method is characterized in that cold energy generated in the gasification of liquid oxygen and liquid nitrogen is respectively utilized to condense the smoke coming out of a tubular preheater (10) and the smoke in front of a smoke dust collector (25) in a first smoke condenser (3) and a second smoke condenser (23), the condensed water is respectively collected in a first water collector (4) and a second water collector (24) and finally collected to the first water collector (4), the high-temperature smoke is utilized to supply heat to a steam state for the water in the first water collector (4), and the high-temperature smoke is combined with gasified pure oxygen to form oxygen-enriched primary air, secondary air and pure oxygen over-fire air, the oxygen-enriched primary air, the secondary air and the pure oxygen over-fire air are respectively led out by a primary air fan (12), a secondary air fan (13) and an over-fire air fan (11) to be sentxThe amount of production.
2. O according to claim 12/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxThe mixed combustion system is characterized by also comprising a flue gas dust remover (25) and a chimney (26), wherein the condensed flue gas is subjected to dust removal in the flue gas dust remover (25) and is finally discharged from the chimney (26).
3. O according to claim 1 or 22/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxLignite and gasified carbon residue O of co-combustion system2/H2A method of O-combustion, comprising:
(1) drying lignite and coal water slurry gasified carbon residue by utilizing tail flue gas, collecting dried water, and forming O in a furnace2/H2O combustion atmosphere;
(2) condensing and collecting moisture in the flue gas by using cold energy generated during gasification of liquid nitrogen and liquid oxygen;
(3) preheating gasified carbon residue by utilizing tail flue gas to strengthen the combustion process;
(4) the gasification carbon residue inlet (15) is arranged between the first lignite inlet (14) and the second lignite inlet (16), and the gasification carbon residue is assisted by utilizing the characteristic of high volatile components of lignite to combust gas, so that the combustion process of an ignition area is strengthened;
(5) the water in the first water collector (4) is heated to be in a steam state by using high-temperature flue gas, and then is mixed with pure oxygen and sent into the furnace for combustion, so that the air distribution mode is optimized.
4. O according to claim 1 or 22/H2Low NO for brown coal and gasified carbon residue of O combustion boilerxPower station boiler brown coal blending combustion gasification carbon residue coupling low NO of blending combustion systemxA method of combustion, comprising:
(1) formation of O in a boiler2/H2O combustion, reduced NO in boilerxDischarging;
(2) the pure oxygen and the water vapor are mixed into oxygen-enriched primary air, secondary air and pure oxygen over-fire air, so that the combustion of fuel in the boiler is enhanced, and NO at the outlet of the boiler is reducedxDischarging;
(3) oxygen-enriched primary air and secondary air are preheated in a first air preheater (19), pure oxygen over-fire air is preheated in a second air preheater (20), and the combustion efficiency of the boiler is improved;
(4) the oxygen proportion in the oxygen-enriched primary air and the secondary air is adjusted according to the requirement, and the low NO isxThe temperature of the hearth can be adjusted while the combustion is carried out.
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