CN106401677B - One kind being based on supercritical CO2The coal-burning boiler electricity generation system of working medium - Google Patents

One kind being based on supercritical CO2The coal-burning boiler electricity generation system of working medium Download PDF

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CN106401677B
CN106401677B CN201610874275.7A CN201610874275A CN106401677B CN 106401677 B CN106401677 B CN 106401677B CN 201610874275 A CN201610874275 A CN 201610874275A CN 106401677 B CN106401677 B CN 106401677B
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carbon dioxide
heat exchanger
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CN106401677A (en
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向军
周敬
胡松
苏胜
汪
汪一
江龙
司宁宁
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Huazhong University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses one kind to be based on supercritical CO2The coal-burning boiler electricity generation system of working medium is made of coal processing subsystem, boiler subsystem, vent gas treatment subsystem, carbon dioxide capture subsystem, carbon dioxide compression subsystem and carbon dioxide Brayton steam turbine cycle subsystem.The present invention is directed to supercritical CO2In the application of boiler, coal-burning power plant's supercritical CO2Brayton circulation replace conventional vapor Rankine cycle process, full factory's efficiency is up to 50% or more.The present invention improves the supply for leading to reduce fuel, reduces the discharge of pollutant, while CO is added2Capture system further improves the effect of energy-saving and emission-reduction.The present invention efficiently full factory's efficiency and the discharge of low pollution object, while making full use of CO in flue gas2, achieve the effect that energy-saving and emission-reduction.

Description

One kind being based on supercritical CO2The coal-burning boiler electricity generation system of working medium
Technical field
The invention belongs to coal-burning boiler technical fields, more particularly to one kind to be based on supercritical CO2The coal-burning boiler of working medium is sent out Electric system.
Background technique
Currently, the discharge for improving generating set efficiency, reduction pollutant is the eternal theme and target of power industry research； Boiler system is mainly using steam Rankine cycle as the energy conversion system of mainstream, and full factory's efficiency is 40% or so.In order to break through The bottleneck of traditional route, some new concept advanced power systems receive more and more attention, supercritical CO2Working medium has suitable Critical pressure, nontoxic low cost, energy density is big, and heat transfer efficiency is high, and system is simple, it is compact-sized the features such as.Overcritical work It is the popular topic of a comparison that matter, which is used in power field, in a kind of supercritical CO of patent 201410091771.62Working medium is followed It in ring electricity generation system, is combined using the energy and absorption system of boiler exhaust gas, treated super faces CO2Pushing turbine Power generation；Being equally applied to boiler system has a kind of Novel supercritical carbon dioxide coal-burning boiler of patent 201510117556.3, should The shape of patent major design boiler and the arrangement of heating surface.
However existing patent relatively lacks for coal fired power generation, especially to supercritical CO2It is transported in entire boiler system Row principle and process.
Summary of the invention
The purpose of the present invention is to provide one kind to be based on supercritical CO2The coal-burning boiler electricity generation system of working medium, it is intended to solve Existing patent relatively lacks for coal fired power generation, especially to supercritical CO2In entire boiler system operation logic and process The problem of；Supercritical CO2Very big change is provided with to entire boiler and steam-turbine unit as working medium instead of water.
The invention is realized in this way a kind of be based on supercritical CO2The coal-burning boiler electricity-generating method of working medium, it is described based on super Critical CO2The coal-burning boiler electricity-generating method of working medium includes:
Raw coal is sent to the burning of boiler subsystem by the operations such as broken, dry, grinding and (is fallen by coal bunker by coal processing subsystem Under raw coal through feeder be sent into coal pulverizer be milled into coal dust.Hot-air is needed to heat coal during coal powder grinding And drying.Cold air is sent into the air preheater of boiler tail by flue gas by pressure fan.The heat come out from air preheater Air a part is sent into coal pulverizer through row powder fan, is heated and is dried to coal, while this part hot-air is also conveying coal The medium of powder.The mixture of the coal dust and air that exclude from coal pulverizer enters hearth combustion through coal burner --- and these are all Technology common at present), the high-temperature flue gas generated after burning is through the vent gas treatment subsystem denitration, dedusting, desulfurization (such skill Art is a variety of ----the successively denitration, dedusting, de- of vent gas treatment subsystem denitrification apparatus, dust-extraction unit, desulfurizer can be used Sulphur) operation obtain clean flue gas；
Through the resulting clean flue gas of vent gas treatment subsystem processes through the carbon dioxide capture subsystem by high concentration CO2Capture, is sent to carbon dioxide compression subsystem and compresses to obtain the supercritical CO of high pressure2It supplements to the carbon dioxide Brayton Steam turbine cycle subsystem；
Through carbon dioxide capture subsystem flue gas emission atmosphere at large, carbon dioxide Brayton steam turbine cycle In subsystem, the supercritical CO of high pressure low temperature2Become the supercritical CO of high temperature and pressure by the heating surface heat exchange of boiler subsystem2, Steam-turbine unit work done power generation in carbon dioxide Brayton steam turbine cycle subsystem.
Another object of the present invention is to provide supercritical CO is based on described in one kind2The coal-burning boiler electricity-generating method of working medium Based on supercritical CO2The coal-burning boiler electricity generation system of working medium, it is described to be based on supercritical CO2The coal-burning boiler electricity-generating method system of working medium System includes:
Coal processing subsystem, for broken to raw coal, dry, grinding；
Boiler subsystem is connect with coal processing subsystem, the raw coal combustion for will handle, and generates high-temperature flue gas；
Vent gas treatment subsystem is connect with boiler subsystem, for high-temperature flue gas to be carried out denitration, dedusting, desulfurization；
Carbon dioxide capture subsystem is connect with vent gas treatment subsystem, for capturing the CO of high concentration2；
Carbon dioxide compression subsystem is connect with carbon dioxide capture subsystem, for compressing the CO of high concentration2Obtain height The supercritical CO of pressure2；
Carbon dioxide Brayton steam turbine cycle subsystem, connect with carbon dioxide compression subsystem, and being used for will be at large The flue gas emission atmosphere obtained, the supercritical CO of high pressure low temperature2Become the supercritical CO of high temperature and pressure through heating surface heat exchange2。
Further, the carbon dioxide Brayton steam turbine cycle subsystem is exchanged heat by main compressor, third level economy Device, carbon dioxide compression subsystem heat exchanger, second level economizer heat exchanger, first order economizer heat exchanger, economizer, superheater, First order reheater, second level reheater, the first level steam turbine 6-10, the second level steam turbine, third level steam turbine, auxiliary compression Machine, carbon dioxide absorption subsystem heat exchanger, cooler composition.
The supercritical CO of low-temp low-pressure2It is compressed through main compressor, a part is heated through third level economizer heat exchanger low temperature side, Another part is mixed through the heating of carbon dioxide compression subsystem heat exchanger and second level economizer heat exchanger low temperature side exit flow；
Third level economizer heat exchanger low temperature side exit flow, a part flow through economizer heating, and another part flows through second Grade economizer heat exchanger low temperature side heating；Second level economizer heat exchanger low temperature side exit flow, and come from carbon dioxide compression subsystem Unite heat exchanger air-flow and converge through auxiliary compressor exit flow, flow through the first order economizer heat exchanger low temperature side heating；
First order economizer heat exchanger low temperature side exit flow and economizer air-flow converge, the overheat through boiler subsystem Device heating, flows into the first level steam turbine work done, and obtained exhaust steam in steam turbine is heated through the first order reheater in boiler subsystem The second level steam turbine work done is flowed into, obtained exhaust steam in steam turbine flows into third through the second level reheater heating in boiler subsystem Level steam turbine work done obtains the supercritical CO of high-temperature low-pressure by three level steam turbine works done2Air-flow；
Gained air-flow cools down through first order economizer heat exchanger high temperature side, and it is high that a part of air-flow flows into second level economizer heat exchanger Warm side, another part flow into the heat exchange of carbon dioxide absorption subsystem heat exchanger；Second level economizer heat exchanger high temperature side exit flow A part flow into auxiliary compressor in, another part air-flow and from flow into carbon dioxide absorption subsystem heat exchanger exit air-flow Converge, flows into third level economizer heat exchanger high temperature side；Finally, air-flow passes through the cooler, completes a whole set of circulation.
It is provided by the invention to be based on supercritical CO2The coal-burning boiler electricity generation system of working medium, for supercritical CO2In boiler Using coal-burning power plant's supercritical CO2Brayton circulation replace conventional vapor Rankine cycle process, full factory's efficiency is up to 50% or more.The present invention improves the supply for leading to reduce fuel, reduces the discharge of pollutant, while CO is added2Capture system System, further improves the effect of energy-saving and emission-reduction.The present invention efficiently full factory's efficiency and the discharge of low pollution object, while sufficiently benefit With CO in flue gas2, achieve the effect that energy-saving and emission-reduction；The whole series recycle its turbine efficiency and are up to 51% or so, significantly larger than Traditional Steam Turbine.
Detailed description of the invention
Fig. 1 is provided in an embodiment of the present invention based on supercritical CO2The coal-burning boiler power generation system structure schematic diagram of working medium；
Fig. 2 is carbon dioxide Brayton steam turbine cycle subsystem structure schematic diagram provided in an embodiment of the present invention；
In figure: 1, coal processing subsystem；2, boiler subsystem；3, vent gas treatment subsystem；4, carbon dioxide capture subsystem System；5, carbon dioxide compression subsystem；6, carbon dioxide Brayton steam turbine cycle subsystem；6-1, main compressor；6-2, Third level economizer heat exchanger；6-3, carbon dioxide compression subsystem heat exchanger；6-4, second level economizer heat exchanger；6-5, the first order Economizer heat exchanger；6-6, economizer；6-7, superheater；6-8, first order reheater；6-9, second level reheater；6-10, first Level steam turbine；6-11, the second level steam turbine；6-12, third level steam turbine；6-13, auxiliary compressor；6-14, carbon dioxide are inhaled Receive subsystem heat exchanger；6-15, cooler.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the embodiment of the present invention based on supercritical CO2The coal-burning boiler electricity generation system of working medium handles son by coal System 1, boiler subsystem 2, vent gas treatment subsystem 3, carbon dioxide capture subsystem 4, carbon dioxide compression subsystem 5 and two Carbonoxide Brayton steam turbine cycle subsystem 6 forms.
Coal processing subsystem 1, for broken to raw coal, dry, grinding.
Boiler subsystem 2 is connect with coal processing subsystem 1, the raw coal combustion for will handle, and generates high-temperature flue gas.
Vent gas treatment subsystem 3 is connect with boiler subsystem 2, for high-temperature flue gas to be carried out denitration, dedusting, desulfurization.
Carbon dioxide capture subsystem 4 is connect with vent gas treatment subsystem 3, for capturing the CO of high concentration2。
Carbon dioxide compression subsystem 5 is connect with carbon dioxide capture subsystem 4, for compressing the CO of high concentration2It obtains The supercritical CO of high pressure2。
Carbon dioxide Brayton steam turbine cycle subsystem 6, connect with carbon dioxide compression subsystem 5, and being used for will not Captured flue gas emission atmosphere, the supercritical CO of high pressure low temperature2Become the supercritical CO of high temperature and pressure through heating surface heat exchange2。
As shown in Fig. 2, the carbon dioxide Brayton steam turbine cycle subsystem 6 of the embodiment of the present invention is by main compressor 6- 1, third level economizer heat exchanger 6-2, carbon dioxide compression subsystem heat exchanger 6-3, second level economizer heat exchanger 6-4, the first order Economizer heat exchanger 6-5, economizer 6-6, superheater 6-7, first order reheater 6-8, second level reheater 6-9, first order steamer Machine 6-10, the second level steam turbine 6-11, third level steam turbine 6-12, auxiliary compressor 6-13, carbon dioxide absorption subsystem change Hot device 6-14, cooler 6-15 composition.
The supercritical CO of low-temp low-pressure2It is compressed through main compressor 6-1, a part is through third level economizer heat exchanger 6-2 low temperature Side heating, another part is through carbon dioxide compression subsystem heat exchanger 6-3 heating and second level economizer heat exchanger 6-4 low temperature side Exit flow mixing；
Third level economizer heat exchanger 6-2 low temperature side exit flow, a part flow through economizer 6-6 heating, another part stream It is heated through second level economizer heat exchanger 6-4 low temperature side；Second level economizer heat exchanger 6-4 low temperature side exit flow, and come from dioxy Change the air-flow of carbon compression subsystem heat exchanger 6-3 and converge through auxiliary compressor 6-13 exit flow, flows through first order economy The heating of heat exchanger 6-5 low temperature side；
First order economizer heat exchanger 6-5 low temperature side exit flow and economizer 6-6 air-flow converge, the institute through boiler subsystem Superheater 6-7 heating is stated, flows into the first level steam turbine 6-10 work done, obtained exhaust steam in steam turbine is through first in boiler subsystem Grade reheater 6-8 heating flows into the second level steam turbine 6-11 work done, and obtained exhaust steam in steam turbine is through second in boiler subsystem Grade reheater 6-9 heating flows into the 6-12 work done of third level steam turbine, obtains the super of high-temperature low-pressure by three level steam turbine works done and faces Boundary CO2Air-flow；
Gained air-flow cools down through first order economizer heat exchanger 6-5 high temperature side, and a part of air-flow flows into the heat exchange of second level economy Device 6-4 high temperature side, another part flow into carbon dioxide absorption subsystem heat exchanger 6-3 heat exchange；Second level economizer heat exchanger 6-4 high Warm side outlet air-flow a part flows into auxiliary compressor 6-13, another part air-flow and from flowing into carbon dioxide absorption subsystem System heat exchanger 6-3 exit flow converges, and flows into third level economizer heat exchanger 6-2 high temperature side；Finally, air-flow passes through the cooler 6-15 completes a whole set of circulation.
The working principle of the invention:
Raw coal is sent to the boiler subsystem by the operations such as broken, dry, grinding and burnt by the coal processing subsystem, The high-temperature flue gas generated after burning obtains clean flue gas through operations such as the vent gas treatment subsystem denitration, dedusting, desulfurization.Through institute The resulting clean flue gas of vent gas treatment subsystem processes is stated through the carbon dioxide capture subsystem by the CO of high concentration2Capture, The carbon dioxide compression subsystem is sent to compress to obtain the supercritical CO of high pressure2It supplements to the carbon dioxide Brayton vapour Turbine cycle subsystem, through carbon dioxide capture subsystem flue gas emission atmosphere at large.The carbon dioxide In Brayton steam turbine cycle subsystem, the supercritical CO of high pressure low temperature2It exchanges heat and becomes by the heating surface of the boiler subsystem For the supercritical CO of high temperature and pressure2, steam-turbine unit work done in the carbon dioxide Brayton steam turbine cycle subsystem Power generation.
The carbon dioxide Brayton steam turbine cycle subsystem includes steam turbine, a plurality of types of heat exchangers, compressor Deng.The supercritical CO of low-temp low-pressure2It is compressed through the main compressor, a part adds through the third level economizer heat exchanger low temperature side Heat, another part is through carbon dioxide compression subsystem heat exchanger heating and the second level economizer heat exchanger low temperature side outlet Air-flow mixing；The third level economizer heat exchanger low temperature side exit flow, a part flow through the economizer heating, another part Flow through the second level economizer heat exchanger low temperature side heating；The second level economizer heat exchanger low temperature side exit flow, and come from The air-flow of the carbon dioxide compression subsystem heat exchanger and converge through the auxiliary compressor exit flow, flows through described The heating of level-one economizer heat exchanger low temperature side；The first order economizer heat exchanger low temperature side exit flow and the economizer air-flow converge It closes, the superheater heating through the boiler subsystem flows into the first level steam turbine work done, obtained exhaust steam in steam turbine The second level steam turbine work done is flowed into through the first order reheater heating in the boiler subsystem, obtained exhaust steam in steam turbine is through institute The second level reheater heating stated in boiler subsystem flows into the work done of third level steam turbine, obtains height by three level steam turbine works done The supercritical CO of warm low pressure2Air-flow；Gained air-flow cools down through the first order economizer heat exchanger high temperature side, and a part of air-flow flows into The second level economizer heat exchanger high temperature side, inflow carbon dioxide absorption subsystem heat exchanger heat exchange described in another part；It is described Second level economizer heat exchanger high temperature side exit flow a part flows into the auxiliary compressor, another part air-flow and comes from institute It states inflow carbon dioxide absorption subsystem heat exchanger exit air-flow to converge, flows into the third level economizer heat exchanger high temperature side；Most Eventually, air-flow passes through the cooler, completes a whole set of circulation.
Preferably, in the carbon dioxide Brayton steam turbine cycle subsystem working medium all in supercriticality.
Application principle of the invention is explained in detail combined with specific embodiments below.
Embodiment 1
It is 133.36t/h that the embodiment of the present invention, which keeps coal input quantity, and the sample coal used is as shown in Table 1, air inlet amount For 1000t/h.
The elemental analysis and Industrial Analysis of table one, sample
The carbon dioxide Brayton steam turbine cycle subsystem, 31 DEG C, the supercritical CO of 7.4Mpa2Through the main pressure Contracting machine adiabatic compression is divided to two plumes, a part 70% is heated through the third level economizer heat exchanger low temperature side, another to 32Mpa Part 30% makes full use of waste heat therein through the carbon dioxide compression subsystem heat exchanger；The third level economizer heat exchanger Low temperature side exit flow, a part flow through the economizer heating, and another part flows through the second level economizer heat exchanger low temperature Side heating；The second level economizer heat exchanger low temperature side exit flow, and come from the carbon dioxide compression subsystem heat exchanger Air-flow and converge through the auxiliary compressor exit flow, flow through first order economizer heat exchanger low temperature side heating；Institute It states first order economizer heat exchanger low temperature side exit flow and the economizer air-flow converges, the mistake through the boiler subsystem Hot device heating, flows into the first level steam turbine work done by 620 DEG C of steam parameter, 31.1Mpa, obtained exhaust steam in steam turbine warp First order reheater heating in the boiler subsystem, temperature flow into the second level steam turbine work done, obtained vapour up to 620 DEG C Turbine steam exhaust is heated to 620 DEG C of inflow third level steam turbine works done through the second level reheater in the boiler subsystem, passes through Three level steam turbine works done obtain the supercritical CO of high-temperature low-pressure2Air-flow；Gained air-flow is through the first order economizer heat exchanger high temperature Side cooling, a part of air-flow flow into the second level economizer heat exchanger high temperature side, flow into carbon dioxide absorption described in another part The heat exchange of subsystem heat exchanger；The second level economizer heat exchanger high temperature side exit flow 30% flows into the auxiliary compressor insulation It is compressed to 31.9Mpa, another part air-flow and converges from the inflow carbon dioxide absorption subsystem heat exchanger exit air-flow, Flow into the third level economizer heat exchanger high temperature side；Finally, air-flow is cooled to 31 DEG C through subcooler, completes a whole set of circulation.It is whole Set recycles its turbine efficiency and is up to 51% or so, significantly larger than traditional Steam Turbine.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (1)

1. a kind of coal-burning boiler electricity-generating method based on supercritical CO 2 working medium, which is characterized in that described to be based on supercritical CO 2 work The coal-burning boiler electricity-generating method of matter includes:
Raw coal is sent to the burning of boiler subsystem, the high temperature cigarette generated after burning by broken, dry, grinding by coal processing subsystem Gas obtains clean flue gas through the denitration of vent gas treatment subsystem, dedusting, desulfurization operations；
Through the resulting clean flue gas of vent gas treatment subsystem processes through carbon dioxide capture subsystem by the CO of high concentration2Capture, send It compresses to obtain the supercritical CO of high pressure toward carbon dioxide compression subsystem2It supplements and gives carbon dioxide Brayton steam turbine cycle System, through carbon dioxide capture subsystem flue gas emission atmosphere at large；
In carbon dioxide Brayton steam turbine cycle subsystem, the supercritical CO of high pressure low temperature2By the heated of boiler subsystem Face, which exchanges heat, becomes the supercritical CO of high temperature and pressure2, steam-turbine unit in carbon dioxide Brayton steam turbine cycle subsystem Work done power generation；
It is described to be based on supercritical CO2The system of the coal-burning boiler electricity-generating method of working medium includes:
Coal processing subsystem, for broken to raw coal, dry, grinding；
Boiler subsystem is connect with coal processing subsystem, the raw coal combustion for will handle, and generates high-temperature flue gas；
Vent gas treatment subsystem is connect with boiler subsystem, for high-temperature flue gas to be carried out denitration, dedusting, desulfurization；
Carbon dioxide capture subsystem is connect with vent gas treatment subsystem, for capturing the CO of high concentration2；
Carbon dioxide compression subsystem is connect with carbon dioxide capture subsystem, for compressing the CO of high concentration2Obtain high pressure Supercritical CO2；
Carbon dioxide Brayton steam turbine cycle subsystem, connect with carbon dioxide compression subsystem, for compressing after capturing Carbon dioxide add to carbon dioxide Brayton steam turbine cycle subsystem, the supercritical CO of high pressure low temperature2It is changed through heating surface Thermal change is the supercritical CO of high temperature and pressure2；
The carbon dioxide Brayton steam turbine cycle subsystem is by main compressor, third level economizer heat exchanger, pressurized carbon dioxide Contracting subsystem heat exchanger, second level economizer heat exchanger, first order economizer heat exchanger, economizer, superheater, first order reheater, Second level reheater, the first level steam turbine 6-10, the second level steam turbine, third level steam turbine, auxiliary compressor, carbon dioxide are inhaled Receive subsystem heat exchanger, cooler composition；
The supercritical CO 2 of low-temp low-pressure is compressed through main compressor, and a part is heated through third level economizer heat exchanger low temperature side, another Part is mixed through the heating of carbon dioxide compression subsystem heat exchanger and second level economizer heat exchanger low temperature side exit flow；
Third level economizer heat exchanger low temperature side exit flow, a part flow through economizer heating, and another part flows through second level warp The heat exchanger low temperature side that helps heats；Second level economizer heat exchanger low temperature side exit flow, and changed from carbon dioxide compression subsystem The air-flow of hot device and converge through auxiliary compressor exit flow, flows through the heating of first order economizer heat exchanger low temperature side；
First order economizer heat exchanger low temperature side exit flow and economizer air-flow converge, and the superheater through boiler subsystem adds Heat, flows into the first level steam turbine work done, and obtained exhaust steam in steam turbine is heated through the first order reheater in boiler subsystem and flowed into Second level steam turbine work done, obtained exhaust steam in steam turbine flow into third level vapour through the second level reheater heating in boiler subsystem Turbine work done obtains the supercritical CO of high-temperature low-pressure by three level steam turbine works done2Air-flow；
Gained air-flow cools down through first order economizer heat exchanger high temperature side, and a part of air-flow flows into second level economizer heat exchanger high temperature Side, another part flow into the heat exchange of carbon dioxide absorption subsystem heat exchanger；Second level economizer heat exchanger high temperature side exit flow one Part flow into auxiliary compressor in, another part air-flow and from flow into carbon dioxide absorption subsystem heat exchanger exit air-flow converge It closes, flows into third level economizer heat exchanger high temperature side；Finally, air-flow passes through the cooler, completes a whole set of circulation.
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