CN111550770B - Oxygen-enriched combustion boiler system and operation method thereof - Google Patents
Oxygen-enriched combustion boiler system and operation method thereof Download PDFInfo
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- CN111550770B CN111550770B CN202010317852.9A CN202010317852A CN111550770B CN 111550770 B CN111550770 B CN 111550770B CN 202010317852 A CN202010317852 A CN 202010317852A CN 111550770 B CN111550770 B CN 111550770B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
- F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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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
- 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
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- 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
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- 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
- F23L15/00—Heating of air supplied for combustion
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- 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
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
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- 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
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- 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
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- 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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/28—Fail safe preventing flash-back or blow-back
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
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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
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- Combustion & Propulsion (AREA)
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Abstract
The invention discloses an oxygen-enriched combustion boiler system and an operation method thereof, and the oxygen-enriched combustion boiler system comprises a boiler hearth, a combustor arranged on the boiler hearth, a first air feeder, a first oxygen injection device and a second oxygen injection device, wherein a smoke outlet of the boiler hearth is sequentially connected with the first air feeder, the first oxygen injection device, the second oxygen injection device and the combustor, and the second oxygen injection device is arranged at a position close to the combustor. The system and the operation method solve the technical problem of tempering of the air supply pipeline in the oxygen-enriched combustion system, ensure the continuous and safe operation of the oxygen-enriched combustion system and realize the optimal performance and economic benefit.
Description
Technical Field
The invention relates to the technical field of thermal energy engineering, in particular to an oxygen-enriched combustion boiler system and an operation method.
Background
The oxygen-enriched combustion is based on the existing coal-fired power generation technology, high-purity oxygen is used for replacing combustion-supporting air, and meanwhile, the combustion and heat transfer characteristics of a boiler are adjusted by adopting flue gas circulation, so that high-concentration CO-enriched air can be obtained2The flue gas is further condensed, compressed and purified, and large-scale CO can be easily realized2Enrichment and emission reduction.
The coal dust can take place the pyrolysis at the in-process of heating and produce combustible gas such as methane, and in the oxygen boosting combustion system, the mode of the gaseous supply that adopts the flue gas circulation, after boiler furnace stalls, thereby because combustible matters such as the inside coal dust of entering furnace and the methane that the pyrolysis produced out can not burn completely and get into circulation system, so contain a certain amount of combustible matters in the circulation flue gas. Circulating flue gas will carry out the notes oxygen before getting into furnace so that the oxygen concentration in the gas that gets into furnace reaches the required requirement of boiler actual operation, after the injection oxygen, flue gas and oxygen mix, consequently the combustible substance concentration in the time flue gas will be higher than the combustible substance concentration of system normal operating far away, if oxygen concentration ratio is enough big enough, send the wind pipeline probably to produce the detonation and the tempering when the combustible mixed gas efflux gets into the instant that furnace lighted, thereby destroy pipe-line system and equipment, cause the oxygen boosting combustion system to stop operation comprehensively, bring huge economic loss.
Disclosure of Invention
The invention provides an oxygen-enriched combustion boiler system and an operation method thereof aiming at the problems in the prior art, and solves the technical problem of deflagration and backfire caused by overhigh oxygen content of circulating flue gas in an air supply pipeline in the conventional oxygen-enriched combustion boiler system.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an oxygen-enriched combustion boiler system, which comprises a boiler furnace, a burner disposed on the boiler furnace, a first blower, a first oxygen injector, and a second oxygen injector, wherein a flue gas outlet of the boiler furnace is sequentially connected to the first blower, the first oxygen injector, the second oxygen injector, and the burner, and the second oxygen injector is disposed at a position close to the burner.
In the invention, two oxygen injectors are adopted to inject oxygen into the circulating flue gas in the air supply pipeline, and one of the oxygen injectors is arranged at a position close to the boiler burner, so that the oxygen content of the circulating flue gas in the air supply pipeline before entering the boiler burner can be reduced, and deflagration and backfire of the circulating flue gas in the air supply pipeline caused by overhigh oxygen content can be avoided.
In one embodiment of the invention, the first blower is an overfire air blower, the first oxygen injector is an overfire air first oxygen injector, and the second oxygen injector is an overfire air second oxygen injector.
Further, the outlet of the second oxygen injector is connected with the burner through a pipeline, and the diameter of the outlet connecting pipeline of the second oxygen injector is D1The distance between the second oxygen injector and the burner is in the range (D)1,2D1) I.e. the distance between the second oxygen injector and the burner is between 1 times the diameter of the outlet connecting line of the second oxygen injector and 2 times the diameter of the outlet connecting line of the second oxygen injector.
In the invention, if the distance between the second oxygen injector and the combustor is smaller than the diameter of the outlet connecting pipeline of the second oxygen injector, oxygen injected by the second oxygen injector cannot be uniformly mixed in circulating flue gas before entering the combustor, so that the combustion of the boiler is insufficient; if the distance between the second oxygen injector and the burner is more than 2 times of the diameter of the outlet connecting pipeline of the second oxygen injector, the oxygen content in the pipeline between the outlet of the second oxygen injector and the burner is too high, and the risk of deflagration and backfire exists.
Further, the system also comprises a second blower, a coal mill, a third oxygen injection device and a fourth oxygen injection device, wherein the smoke outlet of the boiler furnace is sequentially connected with the second blower, the coal mill, the third oxygen injection device, the fourth oxygen injection device and the burner, and the fourth oxygen injection device is arranged at a position close to the burner.
In one embodiment of the invention, the second blower is a primary air blower, the third oxygen injector is a primary air first oxygen injector, and the fourth oxygen injector is a primary air second oxygen injector.
Further, the outlet of the fourth oxygen injector is connected with the burner through a pipeline, and the diameter of the outlet connecting pipeline of the fourth oxygen injector is D2The distance between the fourth oxygen injector and the burner is in the range (D)2,2D2) Within.
Further, the system further comprises:
the inlet of the dust remover is connected with the flue gas outlet of the boiler furnace;
the inlet of the induced draft fan is connected with the outlet of the dust remover;
the system comprises a first flue gas circulation pipeline, a second flue gas circulation pipeline and a third flue gas circulation pipeline, wherein one end of the first flue gas circulation pipeline is connected with an outlet of the induced draft fan, the other end of the first flue gas circulation pipeline is connected with the second flue gas circulation pipeline, one end of the second flue gas circulation pipeline is connected with an inlet of the first air feeder, the other end of the second flue gas circulation pipeline is connected with the third flue gas circulation pipeline, and one end of the third flue gas circulation pipeline is connected with an inlet of the second air feeder;
and the first circulating flue gas regulating valve is arranged on the first flue gas circulating pipeline.
In the invention, the first flue gas circulation pipeline is used for conveying wet flue gas generated by combustion of a boiler and treated by a dust remover, and the wet flue gas enters the first air feeder and the second air feeder through the second flue gas circulation pipeline and the third flue gas circulation pipeline respectively.
Further, the system also comprises a desulfurizing tower;
a flue gas inlet of the flue gas heat exchanger is connected with an outlet of the induced draft fan, and a flue gas outlet of the flue gas heat exchanger is connected with an inlet of the desulfurizing tower;
the inlet of the condenser is connected with the outlet of the desulfurizing tower;
a compressor, an inlet of the compressor being connected to an outlet of the condenser;
one end of the fourth flue gas circulation pipeline is connected with the outlet of the condenser, and the other end of the fourth flue gas circulation pipeline is connected with the circulating flue gas inlet of the flue gas heat exchanger;
a chimney;
one end of the fifth flue gas circulation pipeline is connected with a circulating flue gas outlet of the flue gas heat exchanger, and the other end of the fifth flue gas circulation pipeline is connected with an inlet of the chimney;
the other end of the third flue gas circulation pipeline is connected with the fifth flue gas circulation pipeline;
and the second circulating flue gas regulating valve is arranged on the third flue gas circulating pipeline and is positioned between the connecting position of the third flue gas circulating pipeline and the fifth flue gas circulating pipeline and the connecting position of the third flue gas circulating pipeline and the second flue gas circulating pipeline.
In the invention, the fifth flue gas circulation pipeline is used for conveying dry flue gas generated by combustion of a boiler and treated by a dust remover, a desulfurizing tower and a condenser, and the dry flue gas enters the first air feeder and the second air feeder through the second flue gas circulation pipeline and the third flue gas circulation pipeline respectively.
Further, the system still contains the pre-heater, the flue gas entry of pre-heater with the exit linkage of dust remover, the exhanst gas outlet of pre-heater with the entry linkage of draught fan, the once-through air entry of pre-heater and the exit linkage of second forced draught blower, the once-through air export of pre-heater with the entry linkage of coal pulverizer, the overgrate air entry of pre-heater with the exit linkage of first oxygen injection ware, the overgrate air export of pre-heater with the entry linkage of second oxygen injection ware.
The system further comprises an oxygen pipeline and an oxygen storage tank, wherein one end of the oxygen pipeline is connected with the burner, the other end of the oxygen pipeline is connected with the oxygen storage tank, and the first oxygen injector, the second oxygen injector, the third oxygen injector and the fourth oxygen injector are respectively connected with the oxygen pipeline through oxygen injection pipelines.
In a second aspect, the invention provides an operation method of an oxygen-enriched boiler system, which comprises the step that a part of flue gas discharged from a boiler furnace sequentially passes through a secondary air fan, a secondary air first oxygen injector and a secondary air second oxygen injector and then enters a combustor arranged on the boiler furnace, wherein the secondary air first oxygen injector injects oxygen into the flue gas to enable the oxygen concentration of the flue gas in a flue gas feeding pipeline after the secondary air first oxygen injector injects the oxygen to be lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, the secondary air second oxygen injector is arranged close to the combustor, and the secondary air second oxygen injector injects the oxygen into the flue gas to enable the oxygen concentration of the flue gas in the flue gas feeding pipeline after the secondary air second oxygen injector injects the oxygen to reach the secondary air oxygen concentration required by normal operation of the boiler.
The method further comprises the step that another part of the flue gas discharged from the boiler furnace sequentially passes through a primary air fan, a coal pulverizer, a primary air first oxygen injection device and a primary air second oxygen injection device and then enters a combustor arranged on the boiler furnace, the primary air first oxygen injection device injects oxygen into the flue gas to enable the oxygen concentration of the flue gas in an air supply pipeline after the primary air first oxygen injection device injects the oxygen to be lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, the primary air second oxygen injection device is arranged close to the combustor, and the primary air second oxygen injection device injects the oxygen into the flue gas to enable the oxygen concentration of the flue gas in the air supply pipeline after the primary air second oxygen injection device injects the oxygen to reach the primary air oxygen concentration required by normal operation of the boiler.
The air supply pipeline comprises an outlet connecting pipeline of a first oxygen injection device, an outlet connecting pipeline of a second oxygen injection device, an outlet connecting pipeline of a third oxygen injection device and an outlet connecting pipeline of a fourth oxygen injection device.
In the method, the primary air and the secondary air are respectively subjected to oxygen injection twice by adopting the two oxygen injectors, so that the oxygen concentration of the smoke in the air supply pipeline is lower than the minimum oxygen concentration required by deflagration of combustible substances in the smoke in the air supply pipeline when the boiler is in an accidental flameout state, the combustible substances cannot generate flame propagation in the primary air pipeline and the secondary air pipeline, and the problem of tempering of the air supply pipeline caused by combustible substances contained in the smoke in smoke circulation in oxygen-enriched combustion can be effectively solved.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts two oxygen injectors to inject oxygen into the circulating flue gas in the air supply pipeline, and one of the oxygen injectors is arranged at a position close to the boiler burner, so that the oxygen content of the circulating flue gas in the air supply pipeline before entering the boiler burner can be reduced, the oxygen content is lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, the technical problem that the deflagration tempering of the air supply pipeline in the oxygen-enriched combustion system in the prior art is solved, the continuous and safe operation of the oxygen-enriched combustion system is ensured, and the optimal performance and the economic benefit are realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a system according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a system according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a system according to embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of a system according to embodiment 4 of the present invention.
Wherein, in the figures, the respective reference numerals:
1-boiler furnace, 2-secondary fan, 3-secondary air first oxygen injector, 4-secondary air second oxygen injector, 5-burner, 6-primary fan, 7-coal mill, 8-primary air first oxygen injector, 9-flue gas purification treatment device, 10-primary air second oxygen injector, 11-dust remover, 12-induced draft fan, 13-flue gas heat exchanger, 13A-flue gas inlet, 13B-flue gas outlet, 13C-circulating flue gas inlet, 13D-circulating flue gas outlet, 14-desulfurizing tower, 15-condenser, 16-compressor, 17-chimney, 18-preheater, 19-induced draft fan II, 20-booster fan, S1-first flue gas circulating pipeline, S2-second flue gas circulating pipeline, s3-third flue gas circulation pipeline, 21-first circulation flue gas regulating valve, 22-second circulation flue gas regulating valve, S4-fourth flue gas circulation pipeline, S5-fifth flue gas circulation pipeline, M-oxygen pipeline, M1-M4-oxygen injection pipeline
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the embodiments of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Example 1
The boiler system structure shown in fig. 1 is adopted in the embodiment, a flue gas outlet of a boiler furnace is sequentially connected with a flue gas purification treatment device 9, a secondary air fan 2, a secondary air first oxygen injection device 3, a secondary air second oxygen injection device 4 and a combustor 5 through pipelines, boiler flue gas is used as a source of secondary air, the secondary air first oxygen injection device 3 is arranged between the flue gas outlet of the secondary air fan 2 and the boiler furnace and is arranged close to the boiler furnace, the secondary air second oxygen injection device 4 is arranged close to the combustor 5, and the distance between the secondary air second oxygen injection device 4 and the combustor 5 is 1.8 times of the diameter of a flue gas outlet connecting pipeline of the secondary air second oxygen injection device 4. The purification treatment device 9 includes a dust collector and a desulfurizing tower.
The outlet of the primary air fan 6 is connected with a coal mill 7, a primary air first oxygen injection device 8 and a burner 5 in sequence through pipelines, and the primary air is sourced from air. The inlet of the primary air first oxygen injection device 8 is connected with the outlet of the coal mill 7 through a pipeline.
During normal operation of the boiler system, the oxygen injection amount of the secondary air first oxygen injector 3 and the secondary air second oxygen injector 4 can be adjusted according to needs, and the preferable oxygen injection amount of the oxygen injectors meets the following conditions: after oxygen is injected into the flue gas by the secondary air first oxygen injector 3, the oxygen concentration of the flue gas in the secondary air supply pipeline is lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, and after oxygen is injected into the flue gas by the secondary air second oxygen injector 4, the oxygen concentration of the flue gas in the secondary air supply pipeline reaches the oxygen concentration of the secondary air required by normal operation of the boiler.
When the boiler system has an accident in operation, the oxygen injection amount of the overfire air first oxygen injector 3 and the overfire air second oxygen injector 4 must meet the oxygen injection amount condition of the oxygen injectors.
Example 2
In the embodiment, a boiler system structure as shown in fig. 2 is adopted, a flue gas outlet of a boiler furnace is connected with a flue gas purification treatment device 9 through a pipeline, an outlet pipeline of the flue gas purification treatment device 9 is divided into two branches, an outlet of the flue gas purification treatment device 9 is sequentially connected with a secondary air fan 2, a secondary air first oxygen injection device 3, a secondary air second oxygen injection device 4 and a combustor 5 through one branch, and an outlet of the flue gas purification treatment device 9 is sequentially connected with a primary air fan 6, a coal pulverizer 7, a primary air first oxygen injection device 8, a primary air second oxygen injection device 10 and the combustor 5 through the other branch.
The secondary air second oxygen injector 4 is arranged close to the combustor 5, and the distance between the secondary air second oxygen injector 4 and the combustor 5 is 1.8 times of the diameter of an outlet connecting pipeline of the secondary air second oxygen injector 4.
The first oxygen injection device 8 for primary air is arranged between the outlet of the primary air fan 6 and the boiler furnace 1 and is arranged close to the boiler furnace 1, the outlet of the coal pulverizer 7 is connected with the inlet of the first oxygen injection device 8 for primary air, the outlet of the first oxygen injection device 8 for primary air is connected with the inlet of the second oxygen injection device 10 for primary air, the outlet of the second oxygen injection device 10 for primary air is connected with the combustor 5, the second oxygen injection device 10 for primary air is arranged close to the combustor 5, and the distance between the second oxygen injection device 10 for primary air and the combustor 5 is 1.8 times of the diameter of the outlet connecting pipeline of the second oxygen injection device 10 for primary air.
In normal operation or in accident of the boiler system, the oxygen injection amount of the overfire air first oxygen injector 3 and the overfire air second oxygen injector 4 should satisfy the same oxygen injection amount condition as that of the example 1.
During normal operation of the boiler system, the oxygen injection amount of the primary air first oxygen injector 8 and the primary air second oxygen injector 10 can be adjusted according to needs, and the oxygen injection amount of the preferred oxygen injectors meets the following conditions: after oxygen is injected into the flue gas by the primary air first oxygen injector 8, the oxygen concentration of the flue gas in the primary air supply pipeline is lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, and after oxygen is injected into the flue gas by the primary air second oxygen injector 10, the oxygen concentration of the flue gas in the primary air supply pipeline reaches the primary air oxygen concentration required by normal operation of the boiler.
When the boiler system has an accident in operation, the oxygen injection amount of the primary air first oxygen injector 8 and the primary air second oxygen injector 10 still need to meet the above-mentioned primary air oxygen injection amount condition.
Example 3
The present example adopts a boiler system structure as shown in fig. 3, which is basically the same as the boiler system structure described in embodiment 2, except that the system comprises an oxygen pipeline M, one end of the oxygen pipeline M is connected with a burner 5, the other end of the oxygen pipeline M is connected with an oxygen storage tank, a overfire air first oxygen injector 3, an overfire air second oxygen injector 4, a primary air first oxygen injector 8 and a primary air second oxygen injector 10 are respectively connected with the oxygen pipeline M through oxygen injection pipelines M1-M4, and an oxygen regulating valve is arranged on the oxygen injection pipeline.
When the boiler system is in normal operation or in an accident, the overfire air first oxygen injector 3, the overfire air second oxygen injector 4, the primary air first oxygen injector 8 and the primary air second oxygen injector 10 meet the same oxygen injection amount conditions as those of the embodiment 2.
Example 4
The boiler system structure shown in fig. 4 is adopted in this example, the flue gas outlet of the boiler furnace 1 is connected with the inlet of the dust remover 11, the outlet of the dust remover 11 is connected with the flue gas inlet of the preheater 18, the flue gas outlet of the preheater 18 is connected with the inlet of the induced draft fan 12, the outlet of the induced draft fan 12 is connected with the flue gas inlet 13A of the flue gas heat exchanger 13, the flue gas outlet 13B of the flue gas heat exchanger 13 is connected with the inlet of the desulfurizing tower 14, the outlet of the desulfurizing tower 14 is connected with the inlet of the condenser 15, the outlet of the condenser 15 is connected with the inlet of the compressor 16, one end of the fourth flue gas circulation pipeline S4 is connected with the outlet of the condenser 15, and the other end of the fourth flue gas circulation pipeline S4 is connected with the circulation flue gas inlet 13C of the flue gas heat exchanger 13.
One end of the first flue gas circulation pipeline S1 is connected with an outlet of the induced draft fan 12, the other end of the first flue gas circulation pipeline S1 is connected with the second flue gas circulation pipeline S2, one end of the second flue gas circulation pipeline S2 is connected with a flue gas inlet of the secondary air fan 2, the other end of the second flue gas circulation pipeline S2 is connected with the third flue gas circulation pipeline S3, one end of the third flue gas circulation pipeline S3 is connected with an inlet of the primary air fan 6, the other end of the third flue gas circulation pipeline S3 is connected with the fifth flue gas circulation pipeline S5, one end of the fifth flue gas circulation pipeline S5 is connected with a circulating flue gas outlet 13D of the flue gas heat exchanger 13, and the other end of the fifth flue gas circulation pipeline S5 is connected with an inlet of the chimney 17
The primary air inlet of the preheater 18 is connected with the outlet of the primary air fan 6, the primary air outlet of the preheater 18 is connected with the inlet of the coal pulverizer 7, the secondary air inlet of the preheater 18 is connected with the outlet of the first oxygen injection device 3 for secondary air, and the secondary air outlet of the preheater is connected with the inlet of the second oxygen injection device 4 for secondary air. An oxygen inlet of the preheater 18 is connected with the oxygen storage tank through an oxygen pipeline, and an oxygen outlet of the preheater 18 is connected with an inlet of the second oxygen injector 4.
The outlet of the second oxygen injection device 4 is connected with the burner 5, and the distance between the second oxygen injection device 4 and the burner 5 is 1.5 times of the diameter of the outlet connecting pipeline of the second oxygen injection device 4.
The inlet of the first oxygen injection device 3 for secondary air is connected with the outlet of the secondary air fan 2, the outlet of the coal mill 7 is connected with the inlet of the first oxygen injection device 8 for primary air, the outlet of the first oxygen injection device 8 for primary air is connected with the inlet of the second oxygen injection device 10 for primary air, the outlet of the second oxygen injection device 10 for primary air is connected with the burner 5, the distance between the second oxygen injection device 10 for primary air and the burner 5 is 1.5 times of the diameter of the outlet connecting pipeline of the second oxygen injection device 10 for primary air
When the boiler system is in normal operation or in an accident, the overfire air first oxygen injector 3, the overfire air second oxygen injector 4, the primary air first oxygen injector 8 and the primary air second oxygen injector 10 meet the same oxygen injection amount conditions as those of the embodiment 2.
It should be noted that, unless expressly stated or limited otherwise, the terms "communicate" and "connect" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The oxygen-enriched combustion boiler system is characterized by comprising a boiler furnace, a combustor arranged on the boiler furnace, a first air feeder, a first oxygen injection device and a second oxygen injection device, wherein a flue gas outlet of the boiler furnace is sequentially connected with the first air feeder, the first oxygen injection device, the second oxygen injection device and the combustor, the second oxygen injection device is arranged at a position close to the combustor, and the oxygen concentration of flue gas in an air feeding pipeline is lower than the minimum oxygen concentration required by deflagration of combustible substances in the flue gas.
2. The system of claim 1, wherein the outlet of the second oxygen injector is connected to the burner by a conduit, and the diameter of the outlet connecting conduit of the second oxygen injector is D1The distance between the second oxygen injector and the burner is in the range (D)1,2D1) Within.
3. The system of claim 1, further comprising a second blower, a coal mill, a third oxygen injection device and a fourth oxygen injection device, wherein the flue gas outlet of the boiler furnace is connected with the second blower, the coal mill, the third oxygen injection device, the fourth oxygen injection device and the burner in sequence, and the fourth oxygen injection device is disposed at a position close to the burner.
4. The system of claim 3, wherein the outlet of the fourth oxygen injector is connected to the burner by a conduit, and the outlet connecting conduit of the fourth oxygen injector has a diameter D2The distance between the fourth oxygen injector and the burner is in the range (D)2,2D2) Within.
5. The system of claim 3, further comprising:
the inlet of the dust remover is connected with the flue gas outlet of the boiler furnace;
the inlet of the induced draft fan is connected with the outlet of the dust remover;
the system comprises a first flue gas circulation pipeline, a second flue gas circulation pipeline and a third flue gas circulation pipeline, wherein one end of the first flue gas circulation pipeline is connected with an outlet of the induced draft fan, the other end of the first flue gas circulation pipeline is connected with the second flue gas circulation pipeline, one end of the second flue gas circulation pipeline is connected with an inlet of the first air feeder, the other end of the second flue gas circulation pipeline is connected with the third flue gas circulation pipeline, and one end of the third flue gas circulation pipeline is connected with an inlet of the second air feeder;
and the first circulating flue gas regulating valve is arranged on the first flue gas circulating pipeline.
6. The system of claim 5, further comprising a desulfurization tower;
a flue gas inlet of the flue gas heat exchanger is connected with an outlet of the induced draft fan, and a flue gas outlet of the flue gas heat exchanger is connected with an inlet of the desulfurizing tower;
the inlet of the condenser is connected with the outlet of the desulfurizing tower;
a compressor, an inlet of the compressor being connected to an outlet of the condenser;
one end of the fourth flue gas circulation pipeline is connected with the outlet of the condenser, and the other end of the fourth flue gas circulation pipeline is connected with the circulating flue gas inlet of the flue gas heat exchanger;
a chimney;
one end of the fifth flue gas circulation pipeline is connected with a circulating flue gas outlet of the flue gas heat exchanger, and the other end of the fifth flue gas circulation pipeline is connected with an inlet of the chimney;
the other end of the third flue gas circulation pipeline is connected with the fifth flue gas circulation pipeline;
and the second circulating flue gas regulating valve is arranged on the third flue gas circulating pipeline and is positioned between the connecting position of the third flue gas circulating pipeline and the fifth flue gas circulating pipeline and the connecting position of the third flue gas circulating pipeline and the second flue gas circulating pipeline.
7. The system of claim 5, further comprising a preheater, wherein a flue gas inlet of the preheater is connected with an outlet of the dust remover, a flue gas outlet of the preheater is connected with an inlet of the induced draft fan, a primary air inlet of the preheater is connected with an outlet of the second blower, a primary air outlet of the preheater is connected with an inlet of the coal pulverizer, a secondary air inlet of the preheater is connected with an outlet of the first oxygen injection device, and a secondary air outlet of the preheater is connected with an inlet of the second oxygen injection device.
8. The system of any one of claims 3 to 7, further comprising an oxygen line and an oxygen storage tank, wherein one end of the oxygen line is connected to the burner and the other end of the oxygen line is connected to the oxygen storage tank, and wherein the first oxygen injector, the second oxygen injector, the third oxygen injector and the fourth oxygen injector are connected to the oxygen line via oxygen injection lines, respectively.
9. An operation method of an oxygen-enriched boiler system is characterized in that a part of flue gas discharged from a boiler hearth sequentially passes through a secondary fan, a secondary air first oxygen injector and a secondary air second oxygen injector and then enters a burner arranged on the boiler hearth, the secondary air first oxygen injector injects oxygen into the flue gas to enable the oxygen concentration of the flue gas in an air supply pipeline after the secondary air first oxygen injector injects the oxygen to be lower than the lowest value of the oxygen concentration required by deflagration of combustible substances in the boiler pipeline, the secondary air second oxygen injector is arranged close to the burner, and the secondary air second oxygen injector injects the oxygen into the flue gas to enable the oxygen concentration of the flue gas in the air supply pipeline after the secondary air second oxygen injector injects the oxygen to reach the secondary air oxygen concentration required by normal operation of the boiler.
10. The operating method of claim 9, further comprising feeding another part of the flue gas discharged from the boiler furnace into a burner arranged on the boiler furnace after passing through a primary air fan, a coal pulverizer, a primary air first oxygen injector and a primary air second oxygen injector in sequence, wherein the primary air first oxygen injector injects oxygen into the flue gas so that the oxygen concentration of the flue gas in a flue gas feeding pipeline after the primary air first oxygen injector injects oxygen is lower than the lowest value of the oxygen concentration required for deflagration of combustible materials in the boiler pipeline, the primary air second oxygen injector is arranged close to the burner, and the primary air second oxygen injector injects oxygen into the flue gas so that the oxygen concentration of the flue gas in the flue gas feeding pipeline after the primary air second oxygen injector injects oxygen reaches the primary air oxygen concentration required for normal operation of the boiler.
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