CN111928289A - System and method for power cycle low-NOx blue carbon doped combustion - Google Patents
System and method for power cycle low-NOx blue carbon doped combustion Download PDFInfo
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- CN111928289A CN111928289A CN202010718054.7A CN202010718054A CN111928289A CN 111928289 A CN111928289 A CN 111928289A CN 202010718054 A CN202010718054 A CN 202010718054A CN 111928289 A CN111928289 A CN 111928289A
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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
- F23L7/002—Supplying water
- F23L7/005—Evaporated water; Steam
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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
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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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- F23L15/04—Arrangements of recuperators
- F23L15/045—Arrangements of recuperators using intermediate heat-transfer fluids
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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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- 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 power cycle low-NOx blue carbon doped system and a power cycle low-NOx blue carbon doped method. The invention utilizes supercritical CO2Tail flue gas generated in a circulating mode heats condensed water into steam and high-temperature steam, then the steam and the prepared pure oxygen are mixed in different proportions, and NOx emission of the boiler is reduced by optimizing air distribution. The high-temperature water vapor and the semi-coke are preheated in a contact mode, so that the combustion of the semi-coke is enhanced. Recycling high-temperature CO2The hot air generated by heating is sent into a chemical chain air separation oxygen generation system to prepare pure oxygen. Carrying out O in a boiler2/H2Combustion of OThe flue gas after burning is rich in water vapor and CO2Condensing and collecting water vapor and then carrying out CO2And enriching, thereby reducing the emission of greenhouse gases. The coupled chemical chain air separation oxygen generation system, the novel power circulation system and the preheating combustion system realize the utilization of semi coke in a power station boiler, improve the industrial production efficiency and reduce the emission of greenhouse gases.
Description
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 a power cycle low-NOx blue carbon doped burning system and a power cycle low-NOx blue carbon doped burning method.
Background
The classified utilization of the low-rank coal is an effective way for realizing the clean and efficient utilization of the coal resources, and the reserve of the low-rank coal in China accounts for about more than 55% of the reserve of the coal which has been proved in China, so the clean and efficient utilization of the low-rank coal is very important. The semi-coke is a product of low-rank coal under medium-low temperature dry distillation, wherein the blocky semi-coke can be continuously utilized in the chemical industry, and the powdery semi-coke cannot be utilized in the chemical industry, but the high carbon content of the powdery semi-coke can be considered to be directly combusted and utilized. The semi-coke has low self volatile content, is difficult to ignite and stabilize, is difficult to burn out, and has high NOx emission in the combustion process, so that the semi-coke and the bituminous coal are considered to be mixed and burnt in the existing power station pulverized coal boiler, the combustible bituminous coal is used for supporting the combustion of the semi-coke, the NOx emission in the combustion process is reduced as much as possible by optimizing an air distribution mode, and an effective way is provided for realizing the efficient clean utilization of the semi-coke.
O2/H2Combustion of O with O2/CO2Combustion without flue gas recirculation, thus reducing NOx and SOxAnd discharging impurity gases. Compared with the traditional cryogenic air separation oxygen generation system, the chemical-chain air separation system is simple and low in cost as a new oxygen generation process, and can obviously improve the efficiency of industrial production by being coupled with a power station boiler system. Supercritical CO2The circulation is a novel power circulation, and the traditional steam circulation is carried out by CO2Cyclic replacement, more compact and flexible arrangement, and CO2The working medium has the characteristics of low critical point, high density and high heat transfer coefficient.
Disclosure of Invention
The invention aims to provide a system and a method for power cycle low-NOx doped blue carbon. The invention utilizes a novel power cycle, namely supercritical CO2The tail flue gas of the higher temperature that the circulation produced heats the comdenstion water for vapor and high temperature vapor, then carries out the mixture of different proportions with the pure oxygen that the empty system oxygen that makes of chemical chain air separation respectively, preheats the back through air heater and provides the hot-blast for different combustion areas, reduces boiler NOx through the mode of optimizing the air distribution. The high-temperature steam and the semi-coke are preheated in a contact mode and then fully mixed with pure oxygen preheated by the air preheater and sent into a hearth, so that combustion of the semi-coke is enhanced. By using supercritical CO2High temperature CO after recycle2The air is heated, and the generated hot air is sent to a chemical chain air separation oxygen generation system to prepare pure oxygen. Carrying out O in a boiler2/H2O combustion, the tail flue gas after combustion is rich in water vapor and CO2After the water vapor is condensed and collected, CO can be carried out2And enriching, thereby reducing the emission of greenhouse gases. The coupled chemical chain air separation oxygen generation system, the novel power circulation system and the preheating combustion system realize the utilization of the flame-retardant fuel semi-coke in a power station boiler system, improve the efficiency of industrial production and reduce the emission of greenhouse gases.
The invention is realized by adopting the following technical scheme:
a power cycle low NOx semi-coke blending burning system comprises a semi-coke coal mill, a bituminous coal mill, a semi-coke preheater, a burnout fan, a reburning fan, a first bituminous coal primary air nozzle, a semi-coke primary air nozzle, a second bituminous coal primary air nozzle, a reburning air nozzle, a burnout air nozzle, a high-temperature water vapor preheater, an air preheater, a water vapor fan, an induced draft fan, a condensate pump, an oxidation reactor, a reduction reactor, an O-shaped carbon2/H2O condenser, second header tank, heater, compressor, flue gas condenser, first water collector, flue gas dust remover, CO2The storage device, the chimney and the boiler body are arranged in a main burning area, a reburning area and a burnout area of the boiler body from bottom to top; wherein the content of the first and second substances,
the first bituminous coal primary air nozzle, the semi-coke primary air nozzle and the second bituminous coal primary air nozzle are sequentially arranged on the side wall of the main burning zone from bottom to top, the reburning air nozzle is arranged on the side wall of the reburning zone, and the overfire air nozzle is arranged on the side wall of the overfire zone; the high-temperature water vapor preheater, the air preheater and the water vapor preheater are sequentially arranged in a tail flue of the boiler body from inside to outside;
the oxidation reactor and the reduction reactor form a chemical chain air separation oxygen generation system for preparing pure oxygen and O2/H2O warp O2/H2The O condenser separates out pure oxygen and comdenstion water, and the comdenstion water is collected to the second header tank, and the export of second header tank communicates to the import of first water collector, and moisture in the afterbody flue gas passes through the flue gas condenser condensation and collects in first water collector, then the flue gas removes dust in the flue gas dust remover after, next in CO2Storage facility for CO2Enriching, and finally discharging through a chimney; condensed water in the first water collector enters a steam preheater through a condensed water pump to be heated into steam, and part of the steam enters a high-temperature steam preheater through a steam fan to be heated into high-temperature steam;
sending semi-coke into a semi-coke coal mill, grinding the semi-coke into powder, mixing the powder with high-temperature steam, sending the powder into a semi-coke preheater, preheating the powder in a contact manner by the semi-coke preheater, mixing the powder with pure oxygen, and sending the mixture into a semi-coke primary air nozzle;
the soft coal is fed into a soft coal pulverizer to be pulverized, and then is mixed with the soft coal primary air and then is fed into a first soft coal primary air nozzle and a second soft coal primary air nozzle;
mixing the pure oxygen and part of the water vapor, then forming oxygen-enriched over-fire air by an over-fire fan, mixing the pure oxygen and part of the water vapor, then forming oxygen-poor reburning air by a reburning fan, feeding the oxygen-enriched over-fire air and the oxygen-poor reburning air into an air preheater through a draught fan for preheating, and then respectively feeding the oxygen-enriched over-fire air and the oxygen-poor reburning air into an over-fire air nozzle and a reb;
high temperature CO2Sequentially passes through a heater and a compressor and then is fed into a boiler, and high-temperature CO is generated2The air is heated by the heater to form hot air, the hot air is sent into the oxidation reactor, and part of steam is sent into the reduction reactor.
The invention is further improved in that supercritical CO is prevented2The temperature of the boiler furnace is overhigh in the circulating process, and O is adopted during combustion2/H2And (4) combusting the oxygen.
The invention has the further improvement that the pure oxygen and the water vapor generated by the water vapor preheater are respectively mixed into bituminous coal primary air, lean oxygen reburning air and oxygen-enriched overfire air according to a set proportion.
A further improvement of the invention is that the oxygen-lean reburning air further reduces the NOx already produced in the reburning zone, while the oxygen-rich overfire air in the burnout zone promotes complete combustion of the fuel.
The further improvement of the invention is that the water vapor is introduced into the reduction reactor to carry oxygen out of the metal carrier, the mixed gas of pure oxygen and the water vapor is formed at the outlet of the reduction reactor, and then the mixed gas is introduced into O2/H2And condensing and collecting water vapor in the O condenser in a second water collecting tank, thereby preparing pure oxygen.
A power cycle low NOx doped with blue char method based on said power cycle low NOx doped with blue char system, the method comprising:
by using supercritical CO2The tail smoke temperature of the circulation is high, the condensed water is heated into steam and high-temperature steam, and O is formed in the boiler2/H2O combustion atmosphere, high concentration CO produced2Flue gas is beneficial to subsequent CO2Enrichment, thereby reducing the emission of greenhouse gases;
the method comprises the following steps of preheating semi-coke in a contact mode by using high-temperature steam and the semi-coke, then sending the semi-coke into a hearth together with pure oxygen preheated by an air preheater, arranging a semi-coke primary air nozzle between two bituminous coal primary air nozzles, and supporting the semi-coke by using heat of bituminous coal combustion, wherein the two means are combined to achieve the purpose of strengthening the semi-coke combustion;
oxygen is produced by utilizing a chemical chain air separation system, water vapor is introduced into a reduction reactor, and O is obtained at an outlet2/H2Introducing O into the mixed gas2/H2The O condenser can prepare pure oxygen, and condensed water obtained by condensation is collectedCollected in the second water collecting tank and finally collected in the first water collecting tank to be finally used as a boiler O2/H2A source of water vapor for O combustion;
mixing the prepared pure oxygen and the water vapor respectively in different proportions to obtain bituminous coal primary air, lean oxygen reburning air and oxygen-enriched overfire air;
high temperature CO2Introducing a heater to heat the air into hot air, and then introducing CO2CO increase by introduction into a compressor2Pressure of, in turn, CO2Feeding into boiler to participate in circulation, and increasing CO2The efficiency of the cycle; simultaneous high temperature CO2The hot air generated by heating by waste heat is introduced into the oxidation reactor to participate in the chemical chain air separation oxygen generation, and part of the steam is introduced into the reduction reactor, so that the production efficiency of the system is improved.
The invention has at least the following beneficial technical effects:
the invention utilizes a chemical chain air separation oxygen generation system consisting of an oxidation reactor and a reduction reactor to prepare pure oxygen, condensed water collected in a first water collector is heated into water vapor and high-temperature water vapor in a high-temperature water vapor preheater and a water vapor preheater through the heat of flue gas in a tail flue, hot air in different combustion areas is formed through different proportions of the water vapor and the pure oxygen, the generation amount of NOx of a boiler is reduced in a wind distribution optimization mode, and O is formed in the boiler2/H2O combustion atmosphere, water in the flue gas is collected in the first water collector through condensation, and CO of tail flue gas can be realized simultaneously2Enriching; novel supercritical CO in boiler2Recycling and utilizing supercritical CO2Preheating pure oxygen and the like by high-temperature flue gas generated circularly; high-temperature steam and semi-coke are subjected to contact type heat exchange in a semi-coke preheater, and finally the high-temperature steam and the semi-coke are introduced into a main combustion area of the boiler together with pure oxygen, so that the purpose of strengthening the combustion of the semi-coke is achieved.
Further, a new power cycle, i.e. supercritical CO, is employed in the boiler2Circulating supercritical CO2The circulating smoke temperature is too high, and the residual heat of the smoke in the tail flue of the boiler can be utilized to preheat hot air and semi coke in different combustion areas, so that the purpose of intensified combustion is achievedAnd (5) the purpose of burning.
Further, to prevent supercritical CO2The temperature of the boiler furnace is overhigh in the circulating process, and O is adopted during combustion2/H2The water in the tail flue gas is condensed and collected in the first water collector through a flue gas condenser, and then the condensed water is heated into steam and high-temperature steam by using a high-temperature steam preheater and a steam preheater arranged in the tail flue to participate in boiler combustion; furthermore, O2/H2The flue gas generated by O combustion is mainly water vapor and CO2After the water vapor is condensed and collected, the flue gas is dedusted in a flue gas deduster, and then CO is treated2Storage facility for CO2Enriching and finally discharging through a chimney.
Furthermore, due to the characteristics that the semi-coke is low in volatile matter and difficult to burn and the like, condensed water in the first water collector is heated into high-temperature steam by the steam preheater and the high-temperature steam preheater respectively, then the high-temperature steam and the semi-coke are preheated in the semi-coke preheater in a contact mode, and are mixed with preheated pure oxygen from the air preheater after being preheated, and the mixture is introduced into the hearth through the semi-coke primary air nozzle, so that the purpose of strengthening the semi-coke combustion is achieved.
Further, a chemical-looping air separation oxygen generation system composed of an oxidation reactor and a reduction reactor is used for preparing pure oxygen, then the pure oxygen and water vapor generated by a water vapor pre-heater are respectively mixed into bituminous coal primary air, lean oxygen reburning air and oxygen-enriched over-fire air according to a set proportion, the bituminous coal primary air, the lean oxygen reburning air and the oxygen-enriched over-fire air are preheated by an air pre-heater and then are introduced into a hearth, the generated NOx can be further reduced by the lean oxygen reburning air in a reburning zone, the oxygen-enriched over-fire air in the burnout zone can promote the complete combustion of the fuel, and the purposes of strengthening the combustion and reducing the NOx emission are achieved by; the bituminous coal primary air nozzle and the second bituminous coal primary air nozzle are respectively arranged above and below the semi-coke primary air nozzle, and the combustion of the semi-coke is promoted by utilizing high heat generated by the flammability of the bituminous coal, so that the aim of strengthening the combustion of the semi-coke is fulfilled.
Further, high temperature CO is introduced2The air is heated into hot air by the heater, and CO can be reduced at the moment2Then CO is introduced again2CO increase by introduction into a compressor2Then sent to the furnace to participate in the cycle, at which point the CO can be increased2The efficiency of the cycle; by using high temperature CO2The hot air generated by the waste heat can be introduced into the oxidation reactor to participate in the chemical chain air separation oxygen generation, so that the production efficiency of the system can be improved.
Further, oxygen can be taken out from the metal carrier by introducing the water vapor into the reduction reactor, a mixed gas of pure oxygen and the water vapor is formed at the outlet of the reduction reactor, and then the mixed gas is introduced into O2/H2Condensing and collecting water vapor in an O condenser in a second water collecting tank, thereby preparing pure oxygen; the condensed water collected in the second water collecting tank is finally collected into the first water collecting tank to prepare for the subsequent preparation of steam and high-temperature steam.
Drawings
FIG. 1 is a schematic diagram of a power cycle low NOx loaded semi-coke system of the present invention.
Description of reference numerals:
1 is a semi-coke coal mill, 2 is a bituminous coal mill, 3 is a semi-coke preheater, 4 is an over-fire fan, 5 is a reburning fan, 6 is a first bituminous coal primary air nozzle, 7 is a semi-coke primary air nozzle, 8 is a second bituminous coal primary air nozzle, 9 is a reburning air nozzle, 10 is an over-fire air nozzle, 11 is a high-temperature water vapor preheater, 12 is an air preheater, 13 is a water vapor preheater, 14 is a water vapor fan, 15 is an induced draft fan, 16 is a condensate pump, 17 is an oxidation reactor, 18 is a reduction reactor, 19 is O2/H2O condenser, 20 as second water collecting tank, 21 as heater, 22 as compressor, 23 as flue gas condenser, 24 as first water collecting tank, 25 as flue gas dust remover, 26 as CO2The storage facility, 27 is a chimney, and 28 is a boiler body.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the present invention provides a power cycleThe system for low NOx blending burning of the semi-coke comprises a semi-coke coal mill 1, a bituminous coal mill 2, a semi-coke preheater 3, a burnout fan 4, a reburning fan 5, a first bituminous coal primary air nozzle 6, a semi-coke primary air nozzle 7, a second bituminous coal primary air nozzle 8, a reburning air nozzle 9, a burnout air nozzle 10, a high-temperature water vapor preheater 11, an air preheater 12, a water vapor preheater 13, a water vapor fan 14, an induced draft fan 15, a condensate water pump 16, an oxidation reactor 17, a reduction reactor 18, an O2/H2O condenser 19, second water collecting tank 20, heater 21, compressor 22, flue gas condenser 23, first water collector 24, flue gas dust remover 25, CO2A storage device 26, a chimney 27 and a boiler body 28, and a main combustion zone, a reburning zone and a burnout zone of the boiler arranged from bottom to top; wherein the content of the first and second substances,
the invention utilizes a chemical chain air separation oxygen production system consisting of an oxidation reactor 17 and a reduction reactor 18 to prepare pure oxygen, condensed water collected in a first water collector 24 is heated into steam and high-temperature steam in a high-temperature steam preheater 11 and a steam preheater 13 through the heat of flue gas in a tail flue, and hot air in different combustion areas is formed through different proportions of the steam and the pure oxygen, so that the generation amount of NOx of a boiler is reduced in an air distribution optimization mode, and O is formed in the boiler2/H2In the O combustion atmosphere, water in the flue gas is collected in the first water collector 24 through condensation, and CO of tail flue gas can be realized2Enriching; novel supercritical CO in boiler2Recycling and utilizing supercritical CO2Preheating pure oxygen and the like by high-temperature flue gas generated circularly; high-temperature steam and semi-coke are subjected to contact type heat exchange in a semi-coke preheater 3, and finally the high-temperature steam and the semi-coke are introduced into a main combustion area of the boiler together with pure oxygen, so that the purpose of strengthening the combustion of the semi-coke is achieved.
Further, a new power cycle, i.e. supercritical CO, is employed in the boiler2Circulating supercritical CO2The temperature of the circulating tail flue gas is too high, and the waste heat of the tail flue gas of the boiler can be utilized to preheat hot air, pure oxygen and semi-coke in different combustion areas in the air preheater 12 and the semi-coke preheater 3 respectively, so that the aim of strengthening the semi-coke combustion is fulfilled.
Further, to prevent supercritical CO2The temperature of the boiler furnace is overhigh in the circulating process, and O is adopted during combustion2/H2The water in the tail flue gas is condensed and collected in a first water collector 24 through a flue gas condenser 23, and then the condensed water is heated into steam and high-temperature steam by using a high-temperature steam preheater 11 and a high-temperature steam preheater 13 arranged in a tail flue to participate in boiler combustion; furthermore, O2/H2The flue gas generated by O combustion is mainly water vapor and CO2After the water vapor is condensed and collected, the flue gas is dedusted in a flue gas deduster 25, and then CO is treated2 Storage facility 26 for CO2Enriching to obtain high-concentration CO2And reduces the emission of greenhouse gases, which are finally discharged through the chimney 27.
Further, due to the characteristics that the semi-coke is low in volatile matter and difficult to burn, and the like, the condensed water in the first water collector 24 is heated into high-temperature steam through the steam preheater 13 and the high-temperature steam preheater 11 respectively, and then the high-temperature steam and the semi-coke are preheated in the semi-coke preheater 3 in a contact manner; because the semi-coke is very difficult to burn, the temperature of the steam required during preheating is higher, and the smoke temperature of the tail flue of the steam circulation cannot meet the requirement at the moment, so the supercritical CO is adopted in the invention2Circulating; the preheated high-temperature steam and the semi-coke are mixed with the preheated pure oxygen at the outlet of the air preheater 12 and are introduced into the hearth through the semi-coke primary air nozzle 7, so that the aim of strengthening the combustion of the semi-coke is achieved.
Further, a chemical-looping air separation oxygen generation system composed of an oxidation reactor 17 and a reduction reactor 18 is used for preparing pure oxygen, then the pure oxygen and water vapor generated by a water vapor preheater 13 are respectively mixed into bituminous coal primary air, lean oxygen reburning air and oxygen-enriched overfire air according to a set proportion, the mixture is preheated by an air preheater 12 and then is introduced into a hearth, the lean oxygen reburning air can further reduce the generated NOx in a reburning zone, and the oxygen-enriched overfire air in the overfire zone can promote the complete combustion of the fuel, so that the combustion of the bituminous coal and the semi-coke is enhanced and the purpose of reducing the NOx emission is achieved by optimizing air distribution; the bituminous coal primary air nozzles 6 and the second bituminous coal primary air nozzles 8 are respectively arranged above and below the semi-coke primary air nozzle 7, and the semi-coke combustion is promoted by utilizing high heat generated by combustible bituminous coal, so that the aim of strengthening the semi-coke combustion is fulfilled.
Further, high temperature CO is introduced2The air is heated to hot air by the heater 21, and CO can be reduced2Then CO is introduced again2Introduction into compressor 22 for CO enhancement2Then sent to the furnace to participate in the cycle, at which point the CO can be increased2The efficiency of the cycle; by using high temperature CO2The hot air generated by the waste heat can be introduced into the oxidation reactor 17 to participate in the chemical chain air separation oxygen generation, so that the production efficiency of the system can be improved.
Further, introducing steam into the reduction reactor 18 can bring oxygen out of the metal carrier, forming a mixed gas of pure oxygen and steam at the outlet of the reduction reactor 18, and introducing the mixed gas into O2/H2Condensing and collecting water vapor in a second water collecting tank 20 in the O condenser 19, thereby preparing pure oxygen; the condensed water collected in the second header tank 20 is finally collected into the first header tank 24 in preparation for subsequent preparation of steam and high temperature steam.
Referring to fig. 1, the present invention provides a method for power cycle low NOx doped with blue carbon, comprising:
(1) by using supercritical CO2The tail smoke temperature of the circulation is high, the condensed water is heated into steam and high-temperature steam, and O is formed in the boiler2/H2O combustion atmosphere, high concentration CO produced2Flue gas is beneficial to subsequent CO2Enrichment, thereby reducing the emission of greenhouse gases;
(2) high-temperature steam and semi-coke are used for conducting contact preheating, then the semi-coke is sent into a hearth together with pure oxygen preheated by an air preheater 12, a semi-coke primary air nozzle 7 is arranged between two bituminous coal primary air nozzles, the semi-coke is supported by combustion heat of bituminous coal combustion, and the purpose of strengthening the semi-coke combustion is achieved by combining the two means;
(3) oxygen production by chemical-looping air separation system, introducing steam into reduction reactor 18 to obtain O at outlet2/H2Introducing O into the mixed gas2/H2The O condenser 19 can prepare pure oxygen, and the condensed water obtained by condensation is collected in the second water collecting tank 20 and finally collected into the first water collecting tank 24 to be finally used as the boiler O2/H2A source of water vapor for O combustion;
(4) the prepared pure oxygen and the water vapor are respectively mixed in different proportions to obtain bituminous coal primary air, lean oxygen reburning air and oxygen-enriched overfire air, and the air distribution mode is optimized, so that the combustion efficiency is improved, and the NOx emission of a boiler can be reduced;
(5) high temperature CO2Introducing heater 21 to heat air into hot air, and then introducing CO2Introduction into compressor 22 for CO enhancement2Pressure of, in turn, CO2Feeding into boiler to participate in circulation, wherein CO can be increased2The efficiency of the cycle; simultaneous high temperature CO2The hot air generated by heating by the waste heat can be introduced into the oxidation reactor 17 to participate in the chemical chain air separation oxygen generation, so that the production efficiency of the system is 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 (6)
1. The system is characterized by comprising a semi-coke coal mill (1), a bituminous coal mill (2), a semi-coke preheater (3), an over-fire fan (4), a reburning fan (5), a first bituminous coal primary air nozzle (6), a semi-coke primary air nozzle (7), a second bituminous coal primary air nozzle (8), a reburning air nozzle (9), an over-fire air nozzle (10), a high-temperature water vapor preheater (11), an air preheater (12), a water vapor preheater (13), a water vapor fan (14), an induced draft fan (15), a condensate pump (16), an oxidation reactor (17), a reduction reactor (3)18)、O2/H2O condenser (19), second water collecting tank (20), heater (21), compressor (22), flue gas condenser (23), first water collector (24), flue gas dust remover (25), CO2The storage device (26), the chimney (27) and the boiler body (28) are arranged in a main burning area, a reburning area and a burnout area of the boiler body (28) from bottom to top; wherein the content of the first and second substances,
a first bituminous coal primary air nozzle (6), a semi-coke primary air nozzle (7) and a second bituminous coal primary air nozzle (8) are sequentially arranged on the side wall of the main combustion area from bottom to top, a reburning air nozzle (9) is arranged on the side wall of the reburning area, and an overfiring air nozzle (10) is arranged on the side wall of the overfiring area; the high-temperature water vapor preheater (11), the air preheater (12) and the water vapor preheater (13) are sequentially arranged in a tail flue of the boiler body (28) from inside to outside;
the oxidation reactor (17) and the reduction reactor (18) form a chemical chain air separation oxygen generation system for preparing pure oxygen and O prepared2/H2O warp O2/H2The O condenser (19) separates pure oxygen and condensed water, the condensed water is collected to the second water collecting tank (20), the outlet of the second water collecting tank (20) is communicated to the inlet of the first water collector (24), moisture in tail flue gas is collected in the first water collector (24) through the condensation of the flue gas condenser (23), then the flue gas is dedusted in the flue gas deduster (25), and then CO is dedusted in the flue gas deduster2Storage facility (26) for CO2Enriching and finally discharging through a chimney (27); condensed water in the first water collector (24) enters a steam preheater (13) through a condensed water pump (16) to be heated into steam, and part of the steam enters a high-temperature steam preheater (11) through a steam fan (14) to be heated into high-temperature steam;
sending semi coke into a semi coke coal mill (1) for grinding, mixing with high-temperature steam, sending into a semi coke preheater (3), preheating in a contact manner by the semi coke preheater (3), mixing with pure oxygen, and sending into a semi coke primary air nozzle (7);
the bituminous coal is fed into a bituminous coal pulverizer (2) to be pulverized, and then is mixed with the bituminous coal primary air and then is fed into a first bituminous coal primary air nozzle (6) and a second bituminous coal primary air nozzle (8);
the pure oxygen and part of the water vapor are mixed and then form oxygen-enriched overfire air through an overfire air blower (4), the pure oxygen and part of the water vapor are mixed and then form oxygen-poor overfire air through a reburn air blower (5), and the oxygen-enriched overfire air and the oxygen-poor overfire air are respectively sent into an overfire air nozzle (10) and a reburn air nozzle (9) after being sent into an air preheater (12) for preheating through a draught fan (15);
high temperature CO2Sequentially passes through a heater (21) and a compressor (22) and then is sent into a boiler, and high-temperature CO is generated2Air is heated by a heater (21) to form hot air, the hot air is fed into the oxidation reactor (17), and part of the steam is fed into the reduction reactor (18).
2. The power cycle low NOx doped with blue char system as claimed in claim 1, wherein to prevent supercritical CO2The temperature of the boiler furnace is overhigh in the circulating process, and O is adopted during combustion2/H2And (4) combusting the oxygen.
3. The power cycle low-NOx semi-coke blending system according to claim 1, wherein the pure oxygen and the water vapor generated by the water vapor preheater (13) are mixed into bituminous coal primary air, oxygen-poor reburning air and oxygen-rich overfire air respectively according to different proportions.
4. The power cycle low NOx loaded semi-coke system of claim 1 wherein the lean reburning air further reduces the NOx produced in the reburning zone and the rich oxygen-enriched overfurning air in the burnout zone promotes complete combustion of the fuel.
5. The system of claim 1, wherein the oxygen is carried away from the metal carrier by introducing steam into the reduction reactor (18), a mixture of pure oxygen and steam is formed at the outlet of the reduction reactor (18), and the mixture is introduced into the reduction reactor (18)2/H2The water vapor is condensed and collected in a second water collection tank (20) in an O condenser (19), thereby preparing pure oxygen.
6. A power cycle low NOx doped Ramsbottom carbon method, which is based on a power cycle low NOx doped Ramsbottom carbon system of any one of claims 1 to 5, and comprises:
by using supercritical CO2The tail smoke temperature of the circulation is high, the condensed water is heated into steam and high-temperature steam, and O is formed in the boiler2/H2O combustion atmosphere, high concentration CO produced2Flue gas is beneficial to subsequent CO2Enrichment, thereby reducing the emission of greenhouse gases;
high-temperature steam and semi-coke are used for conducting contact preheating, then the semi-coke is sent into a hearth together with pure oxygen preheated by an air preheater (12), a semi-coke primary air nozzle (7) is arranged between two bituminous coal primary air nozzles, the semi-coke is supported by the aid of heat generated by burning of bituminous coal, and the purpose of strengthening the combustion of the semi-coke is achieved by combining the two means;
oxygen production by means of a chemical-looping air separation system, steam is introduced into a reduction reactor (18) to obtain O at the outlet2/H2Introducing O into the mixed gas2/H2The O condenser (19) can prepare pure oxygen, condensed water obtained by condensation is collected in the second water collecting tank (20) and finally collected in the first water collecting tank (24) to be finally used as the O of the boiler2/H2A source of water vapor for O combustion;
mixing the prepared pure oxygen and the water vapor respectively in different proportions to obtain bituminous coal primary air, lean oxygen reburning air and oxygen-enriched overfire air;
high temperature CO2Introducing a heater (21) to heat the air into hot air, and then introducing CO2Introduction of a compressor (22) for CO increase2Pressure of, in turn, CO2Feeding into boiler to participate in circulation, and increasing CO2The efficiency of the cycle; simultaneous high temperature CO2Hot air generated by heating with waste heat is introduced into an oxidation reactor (17) to participate in chemical chain air separation oxygen generation, and partial steam is introduced into a reduction reactor (18), so that the production efficiency of the system is improved.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112537756A (en) * | 2020-12-15 | 2021-03-23 | 苏州西热节能环保技术有限公司 | Novel chemical chain air separation oxygen generation system and method adopting solar heat supply and application thereof |
| CN113932216A (en) * | 2021-10-20 | 2022-01-14 | 北京航天迈未科技有限公司 | Carbon neutralization system based on pulverized coal boiler transformation and use method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1815505C (en) * | 1990-06-28 | 1993-05-15 | Valyuzhinich Mikhail A | Method of preparation of solid fuel for burning |
| CN102834669A (en) * | 2008-09-26 | 2012-12-19 | 气体产品与化学公司 | Combustion system with steam or water injection |
| US20150089949A1 (en) * | 2013-10-01 | 2015-04-02 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Closed loop supercritical carbon dioxide power cycle |
| CN105509038A (en) * | 2015-12-18 | 2016-04-20 | 华北电力大学（保定） | Bubbling fluidized bed type O2/H20 pressurized oxygen-enriched combustion system |
| CN108151008A (en) * | 2017-11-18 | 2018-06-12 | 西安交通大学 | A kind of power boiler low NOx of high-temperature flue gas preheating semicoke mixes combustion system and method |
| CN109539243A (en) * | 2018-11-16 | 2019-03-29 | 西安交通大学 | A kind of system and method for biomass fuel and the mixed combustion of semicoke |
| CN110260352A (en) * | 2019-06-26 | 2019-09-20 | 西安交通大学 | The electric power station system and method that a kind of low NOx combustion is coupled with white cigarette abatement |
| CN110360589A (en) * | 2019-06-26 | 2019-10-22 | 西安交通大学 | One kind realizing the low NO of semicoke by chemical chain space divisionxMix the electric power station system and method for burning |
| CN110529839A (en) * | 2019-07-12 | 2019-12-03 | 西安交通大学 | The system and method that a kind of coal fired power plant of Brown Gas catalytic combustion-supporting mixes burning semicoke |
| CN111425866A (en) * | 2020-03-27 | 2020-07-17 | 西安交通大学 | Power station boiler low NO for coupling semicoke and sludge mixed burningxMixed combustion system |
-
2020
- 2020-07-23 CN CN202010718054.7A patent/CN111928289B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1815505C (en) * | 1990-06-28 | 1993-05-15 | Valyuzhinich Mikhail A | Method of preparation of solid fuel for burning |
| CN102834669A (en) * | 2008-09-26 | 2012-12-19 | 气体产品与化学公司 | Combustion system with steam or water injection |
| US20150089949A1 (en) * | 2013-10-01 | 2015-04-02 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Closed loop supercritical carbon dioxide power cycle |
| CN105509038A (en) * | 2015-12-18 | 2016-04-20 | 华北电力大学（保定） | Bubbling fluidized bed type O2/H20 pressurized oxygen-enriched combustion system |
| CN108151008A (en) * | 2017-11-18 | 2018-06-12 | 西安交通大学 | A kind of power boiler low NOx of high-temperature flue gas preheating semicoke mixes combustion system and method |
| CN109539243A (en) * | 2018-11-16 | 2019-03-29 | 西安交通大学 | A kind of system and method for biomass fuel and the mixed combustion of semicoke |
| CN110260352A (en) * | 2019-06-26 | 2019-09-20 | 西安交通大学 | The electric power station system and method that a kind of low NOx combustion is coupled with white cigarette abatement |
| CN110360589A (en) * | 2019-06-26 | 2019-10-22 | 西安交通大学 | One kind realizing the low NO of semicoke by chemical chain space divisionxMix the electric power station system and method for burning |
| CN110529839A (en) * | 2019-07-12 | 2019-12-03 | 西安交通大学 | The system and method that a kind of coal fired power plant of Brown Gas catalytic combustion-supporting mixes burning semicoke |
| CN111425866A (en) * | 2020-03-27 | 2020-07-17 | 西安交通大学 | Power station boiler low NO for coupling semicoke and sludge mixed burningxMixed combustion system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112537756A (en) * | 2020-12-15 | 2021-03-23 | 苏州西热节能环保技术有限公司 | Novel chemical chain air separation oxygen generation system and method adopting solar heat supply and application thereof |
| CN113932216A (en) * | 2021-10-20 | 2022-01-14 | 北京航天迈未科技有限公司 | Carbon neutralization system based on pulverized coal boiler transformation and use method thereof |
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