CN110230518A - A kind of coal base supercritical CO2Brayton cycle electricity generation system and method - Google Patents
A kind of coal base supercritical CO2Brayton cycle electricity generation system and method Download PDFInfo
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- CN110230518A CN110230518A CN201910583810.7A CN201910583810A CN110230518A CN 110230518 A CN110230518 A CN 110230518A CN 201910583810 A CN201910583810 A CN 201910583810A CN 110230518 A CN110230518 A CN 110230518A
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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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
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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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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Abstract
The invention discloses a kind of coal base supercritical CO 2 Brayton cycle electricity generation system and method, which includes main compressor, cryogenic regenerator, high temperature regenerator, supercritical CO 2 boiler, high pressure turbine, low pressure turbine, recompression machine and forecooler；Supercritical CO 2 boiler can be dramatically increased using the systemEfficiency and the thermal efficiency, improve the generating efficiency of system, furthermore, in system the inlet and outlet cryogenic fluid stream of gas cooler can be used separately as improper, accident etc. in emergency circumstances supercritical CO 2 boiler high temperature primary gas overtemperature when rapid air injection desuperheat, ensured unit equipment and the safety of operations staff.
Description
Technical field
The invention belongs to supercritical CO 2 circulating generation fields, and in particular to a kind of New type coal base supercritical CO 2 Bretton follows
Ring electricity generation system and method.
Background technique
The efficiency that generating set is continuously improved is the eternal theme and target of power industry research.For electricity power enterprise
Speech, the cycle efficieny of system is higher, and the energy consumption of unit generated energy is lower, and corresponding energy-output ratio and pollutant discharge amount are just
It is lower.Largely studies have shown that supercritical CO 2 Brayton cycle is the new concept advanced power systems of great potential.Due to super
Critical CO2 has the characteristics that energy density is big, heat transfer efficiency is high, and supercritical CO 2 Brayton cycle is sent out under same temperature levels
The generating efficiency of electric system is higher by 5 percentage points or more than conventional vapor Rankine cycle electricity generation system.In addition, and conventional vapor
Rankine cycle electricity generation system is compared, and the equipment such as compressor, turbine and regenerator of supercritical CO 2 cycle generating system are very tight
It gathers, weight and land occupation greatly reduce.Therefore, for the generating set of higher temperature parameter, such as 650 DEG C of units, 700 DEG C of grade machines
Group etc., is undoubtedly optimal selection using supercritical CO 2 Brayton cycle electricity generation system.
For coal base supercritical CO 2 Brayton cycle electricity generation system, supercritical CO 2 boiler is in entire electricity generation systemHow the equipment of the largest loss further increases supercritical CO 2 boilerEfficiency and the thermal efficiency are all this all the time
The research hotspot in field.However, there are no the reports for being directed to this aspect in existing publication.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of New type coal base supercritical CO 2 cloth is provided
Thunder cycle generating system and method, the system can dramatically increase supercritical CO 2 boilerEfficiency and the thermal efficiency, make be
The generating efficiency of system improves；In addition, the inlet and outlet cryogenic fluid stream of gas cooler can be used separately as improper, thing in the system
Therefore rapid air injection desuperheat when waiting the primary gas overtemperature of in emergency circumstances supercritical CO 2 boiler high temperature, ensure unit equipment and fortune
The safety of administrative staff.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of coal base supercritical CO 2 Brayton cycle electricity generation system, including main compressor 1, cryogenic regenerator 2, high temperature return
Hot device 3, supercritical CO 2 boiler 4, high pressure turbine 5, low pressure turbine 6, recompression machine 7 and forecooler 8；
The supercritical CO 2 boiler 4 includes: primary gas air cooling wall 41, low temperature superheater 42, high temperature superheater 43, secondary
Gas air cooling wall 44, low-temperature reheater 45, high temperature reheater 46, temperature controllable register 47, high-temperature air preheater 48, SCR flue gas
Denitrification apparatus 49, low-temperature air preheater 410, gas cooler 411 and flue gas waste heat recovery controllable register 412；
Specific connection relationship is as follows: the hot side outlet working medium of cryogenic regenerator 2 is divided into two-way, wherein connection recompression all the way
The entrance of machine 7, another way are connected to the entrance of forecooler 8, and the outlet working medium of forecooler 8 is connected with the entrance of main compressor 1；
The outlet working medium of main compressor 1 is divided into two-way again, wherein being connected to the cold side input port of cryogenic regenerator 2 all the way, another way connection is super
The working medium entrances of gas cooler 411 in critical CO2 boiler 4, the cold side outlet port working medium of cryogenic regenerator 2 respectively with recompression
The cold side input port of high temperature regenerator 3 is connected to after the outlet working medium of machine 7 and the mixing of the outlet working medium of gas cooler 411, high temperature returns
The cold side outlet port working medium of hot device 3 is connected with the entrance of the primary gas of supercritical CO 2 boiler 4 air cooling wall 41, primary gas air cooling wall
The working medium entrances of 41 outlet working medium connection low temperature superheater 42, the outlet working medium of low temperature superheater 42 are connected to high temperature superheater
The outlet working medium of 43 working medium entrances, high temperature superheater 43 is connected with the entrance of high pressure turbine 5, the outlet work of high pressure turbine 5
Matter is connected to the entrance of the secondary gas air cooling wall 44 of supercritical CO 2 boiler 4, and the outlet working medium of secondary gas air cooling wall 44 is connected to low temperature
The working medium entrances of reheater 45, the working medium entrances of the outlet working medium connection high temperature reheater 46 of low-temperature reheater 45, high temperature reheating
The outlet working medium of device 46 is connected with the entrance of low pressure turbine 6, the heat of the outlet working medium connection high temperature regenerator 3 of low pressure turbine 6
Side entrance, the hot side entrance of the hot side outlet connection cryogenic regenerator 2 of high temperature regenerator 3；
Boiler First air 1k and Secondary Air 2k from pressure fan respectively with the First air of low-temperature air preheater 410 and
Secondary Air entrance is connected, the First air 1k outlet coal pulverizer inlet of low-temperature air preheater 410, Cryogenic air preheating
The outlet Secondary Air 2k of device 410 is connected with the air intake of high-temperature air preheater 48, the air of high-temperature air preheater 48
Entrance is connected to boiler-burner bellows entrance.
Low temperature superheater 42 and low-temperature reheater 45 are arranged side by side on boiler back end ductwork in the supercritical CO 2 boiler 4
Temperature controllable register 47 is located at low temperature superheater 42 and 45 bottom of low-temperature reheater；Low-temperature air preheater 410 and flue gas are cooling
Device 411 is arranged side by side on boiler back end ductwork, and flue gas waste heat recovery controllable register 412 is located at low-temperature air preheater 410 and cigarette
411 bottom of Gas Cooler.
Under design conditions, the outlet smoke temperature of the 4 high temperature air preheater 48 of supercritical CO 2 boiler is 320~390
℃。
A kind of electricity-generating method of coal base supercritical CO 2 Brayton cycle electricity generation system, the hot side of cryogenic regenerator 2
Outlet working medium is divided into two-way, is boosted wherein entering recompression machine 7 all the way by compression, another way enters the entrance of forecooler 8, cold
But enter 1 entrance of main compressor after arriving main compressor inlet temperature, working medium is divided into two after compression boosting in main compressor 1 again
Road, wherein entering the cold side input port of cryogenic regenerator 2 all the way, another way enters the gas cooler in supercritical CO 2 boiler 4
411 working medium entrances, the cold side outlet port working medium of cryogenic regenerator 2 respectively with recompression machine 7 outlet working medium and gas cooler
Enter the cold side input port of high temperature regenerator 3 after 411 outlet working medium mixing, the cold side outlet port working medium of high temperature regenerator 3 enters super
The primary gas air cooling wall 41 of critical CO2 boiler 4 absorbs heat, and subsequently enters the heat absorption of low temperature superheater 42, last low temperature superheater 42
Outlet working medium enters high temperature superheater 43 and completes heat absorption, and the high temperature superheater 43 after the completion of absorbing heat exports working medium and enters high pressure turbine
5 expansion works simultaneously externally export electric energy, and the high pressure turbine 5 after completing acting exports working medium and is again introduced into supercritical CO 2 boiler 4
Secondary gas air cooling wall 44 absorb heat, the outlet working medium of secondary gas air cooling wall 44 enters back into the heat absorption of low-temperature reheater 45, last low temperature
The outlet working medium of reheater 45 enters high temperature reheater 46 and completes heat absorption, the outlet work of the high temperature reheater 46 after completing heat absorption
Matter enters 6 expansion work of low pressure turbine and externally exports electric energy, and the low pressure turbine 6 after completing acting exports working medium and enters high temperature
The hot side outlet working medium of the hot side entrance of regenerator 3, high temperature regenerator 3 enters the hot side entrance of cryogenic regenerator 2；
In supercritical CO 2 boiler 4, temperature controllable register 47 is used to adjust the secondary temperature degree into low pressure turbine 6, leads to
Overregulating temperature controllable register 47 changes the exhaust gas volumn in flue into 45 side of low-temperature reheater, so that it is secondary to play adjusting
The effect of temperature degree；By adjusting flue gas waste heat recovery controllable register 412, so that into 410 side of low-temperature air preheater and cigarette
The flue gas flow of 411 side of Gas Cooler changes, so that playing reduces the purpose that exhaust gas temperature improves boiler thermal efficiency.
The invention has the following advantages:
A kind of coal base supercritical CO 2 Brayton cycle electricity generation system of the present invention, has the advantages that overcritical
CO2 boilerEfficiency and the thermal efficiency significantly improve, and improve the generating efficiency of system；The inlet and outlet low temperature work of gas cooler
Mass flow can be used separately as improper, accident etc. in emergency circumstances supercritical CO 2 boiler high temperature primary gas overtemperature when rapid air injection
Desuperheat, to ensure unit equipment and the safety of operations staff.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Wherein, 1 it is main compressor, 2 be cryogenic regenerator, 3 be high temperature regenerator, 4 be supercritical CO 2 boiler, 5 is high pressure
Turbine, 6 be low pressure turbine, 7 be recompression machine, 8 be forecooler；41-412 is the component in supercritical CO 2 boiler 4, wherein
41 for primary gas be gas-cooled wall, 42 be low temperature superheater, 43 be high temperature superheater, 44 be secondary gas be gas-cooled wall, 45 be cold reheat
Device, 46 be high temperature reheater, 47 be temperature controllable register, 48 be high-temperature air preheater, 49 be SCR equipment for denitrifying flue gas, 410
It is gas cooler for low-temperature air preheater, 411,412 is flue gas waste heat recovery controllable register.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 1, a kind of coal base supercritical CO 2 Brayton cycle electricity generation system of the present invention, including main compressor
1, cryogenic regenerator 2, high temperature regenerator 3, supercritical CO 2 boiler 4, high pressure turbine 5, low pressure turbine 6, recompression machine 7 and pre-cooling
Device 8；
The supercritical CO 2 boiler 4 includes: primary gas air cooling wall 41, low temperature superheater 42, high temperature superheater 43, secondary
Gas air cooling wall 44, low-temperature reheater 45, high temperature reheater 46, temperature controllable register 47, high-temperature air preheater 48, SCR flue gas
Denitrification apparatus 49, low-temperature air preheater 410, gas cooler 411 and flue gas waste heat recovery controllable register 412；
Specific connection relationship is as follows: the hot side outlet working medium of cryogenic regenerator 2 is divided into two-way, wherein connection recompression all the way
The entrance of machine 7, another way are connected to the entrance of forecooler 8, and the outlet working medium of forecooler 8 is connected with the entrance of main compressor 1；
The outlet working medium of main compressor 1 is divided into two-way again, wherein being connected to the cold side input port of cryogenic regenerator 2 all the way, another way connection is super
The working medium entrances of gas cooler 411 in critical CO2 boiler 4, the cold side outlet port working medium of cryogenic regenerator 2 respectively with recompression
The cold side input port of high temperature regenerator 3 is connected to after the outlet working medium of machine 7 and the mixing of the outlet working medium of gas cooler 411, high temperature returns
The cold side outlet port working medium of hot device 3 is connected with the entrance of the primary gas of supercritical CO 2 boiler 4 air cooling wall 41, primary gas air cooling wall
The working medium entrances of 41 outlet working medium connection low temperature superheater 42, the outlet working medium of low temperature superheater 42 are connected to high temperature superheater
The outlet working medium of 43 working medium entrances, high temperature superheater 43 is connected with the entrance of high pressure turbine 5, the outlet work of high pressure turbine 5
Matter is connected to the entrance of the secondary gas air cooling wall 44 of supercritical CO 2 boiler 4, and the outlet working medium of secondary gas air cooling wall 44 is connected to low temperature
The working medium entrances of reheater 45, the working medium entrances of the outlet working medium connection high temperature reheater 46 of low-temperature reheater 45, high temperature reheating
The outlet working medium of device 46 is connected with the entrance of low pressure turbine 6, the heat of the outlet working medium connection high temperature regenerator 3 of low pressure turbine 6
Side entrance, the hot side entrance of the hot side outlet connection cryogenic regenerator 2 of high temperature regenerator 3；
Boiler First air 1k and Secondary Air 2k from pressure fan respectively with the First air of low-temperature air preheater 410 and
Secondary Air entrance is connected, the First air 1k outlet coal pulverizer inlet of low-temperature air preheater 410, Cryogenic air preheating
The outlet Secondary Air 2k of device 410 is connected with the air intake of high-temperature air preheater 48, the air of high-temperature air preheater 48
Entrance is connected to boiler-burner bellows entrance.
Low temperature superheater 42 and low-temperature reheater 45 are arranged side by side on boiler back end ductwork in the supercritical CO 2 boiler 4
Temperature controllable register 47 is located at low temperature superheater 42 and 45 bottom of low-temperature reheater；Low-temperature air preheater 410 and flue gas are cooling
Device 411 is arranged side by side on boiler back end ductwork, and flue gas waste heat recovery controllable register 412 is located at low-temperature air preheater 410 and cigarette
411 bottom of Gas Cooler.
Under design conditions, the outlet smoke temperature of the 4 high temperature air preheater 48 of supercritical CO 2 boiler is 320~390
℃。
As shown in Figure 1, a kind of electricity-generating method of coal base supercritical CO 2 Brayton cycle electricity generation system of the present invention, low temperature return
The hot side outlet working medium of hot device 2 is divided into two-way, is boosted wherein entering recompression machine 7 all the way by compression, another way enters forecooler 8
Entrance, be cooled to after main compressor inlet temperature and enter 1 entrance of main compressor, working medium is risen in main compressor 1 by compression
It is divided into two-way again after pressure, wherein entering the cold side input port of cryogenic regenerator 2 all the way, another way enters in supercritical CO 2 boiler 4
The working medium entrances of gas cooler 411, the cold side outlet port working medium of cryogenic regenerator 2 respectively with recompression machine 7 outlet working medium and
Enter the cold side input port of high temperature regenerator 3, the cold side outlet port of high temperature regenerator 3 after the outlet working medium mixing of gas cooler 411
The primary gas air cooling wall 41 that working medium enters supercritical CO 2 boiler 4 absorbs heat, and subsequently enters the heat absorption of low temperature superheater 42, last low temperature
The outlet working medium of superheater 42 enters high temperature superheater 43 and completes heat absorption, and the high temperature superheater 43 after the completion of absorbing heat exports working medium
Into 5 expansion work of high pressure turbine and externally export electric energy, the high pressure turbine 5 after completing acting export working medium be again introduced into it is super
The secondary gas air cooling wall 44 of critical CO2 boiler 4 absorbs heat, and the outlet working medium of secondary gas air cooling wall 44 enters back into the suction of low-temperature reheater 45
Heat, the outlet working medium of last low-temperature reheater 45 enter high temperature reheater 46 and complete heat absorption, the high temperature reheater after completing heat absorption
46 outlet working medium enters 6 expansion work of low pressure turbine and externally exports electric energy, and the low pressure turbine 6 after completing acting exports work
Matter enters the hot side entrance of high temperature regenerator 3, and the hot side that the hot side outlet working medium of high temperature regenerator 3 enters cryogenic regenerator 2 enters
Mouthful；
In supercritical CO 2 boiler 4, temperature controllable register 47 is used to adjust the secondary temperature degree into low pressure turbine 6, leads to
Overregulating temperature controllable register 47 changes the exhaust gas volumn in flue into 45 side of low-temperature reheater, so that it is secondary to play adjusting
The effect of temperature degree；By adjusting flue gas waste heat recovery controllable register 412, so that into 410 side of low-temperature air preheater and cigarette
The flue gas flow of 411 side of Gas Cooler changes, so that playing reduces the purpose that exhaust gas temperature improves boiler thermal efficiency.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (4)
1. a kind of coal base supercritical CO 2 Brayton cycle electricity generation system, it is characterised in that: including main compressor (1), low temperature backheat
Device (2), high temperature regenerator (3), supercritical CO 2 boiler (4), high pressure turbine (5), low pressure turbine (6), recompression machine (7) and in advance
Cooler (8)；
The supercritical CO 2 boiler (4) include: primary gas air cooling wall (41), low temperature superheater (42), high temperature superheater (43),
Secondary gas air cooling wall (44), low-temperature reheater (45), high temperature reheater (46), temperature controllable register (47), high temperature air preheating
Device (48), SCR equipment for denitrifying flue gas (49), low-temperature air preheater (410), gas cooler (411) and flue gas waste heat recovery
Controllable register (412)；
Specific connection relationship is as follows: the hot side outlet working medium of cryogenic regenerator (2) is divided into two-way, wherein being connected to recompression machine all the way
(7) entrance, another way are connected to the entrance of forecooler (8), the outlet working medium and the entrance phase of main compressor (1) of forecooler (8)
Connection；The outlet working medium of main compressor (1) is divided into two-way again, wherein it is connected to the cold side input port of cryogenic regenerator (2) all the way, it is another
Road is connected to the working medium entrances of the gas cooler (411) in supercritical CO 2 boiler (4), the cold side outlet port work of cryogenic regenerator (2)
Matter is connected to high temperature regenerator with after the outlet working medium of recompression machine (7) and the mixing of the outlet working medium of gas cooler (411) respectively
(3) cold side input port, the cold side outlet port working medium of high temperature regenerator (3) and the primary gas of supercritical CO 2 boiler (4) are gas-cooled wall (41)
Entrance be connected, the working medium entrances of outlet working medium connection low temperature superheater (42) of primary gas air cooling wall (41), cryogenic overheating
The working medium entrances of outlet working medium connection high temperature superheater (43) of device (42), the outlet working medium and high pressure of high temperature superheater (43) are saturating
The entrance of flat (5) is connected, and the secondary gas of outlet working medium connection supercritical CO 2 boiler (4) of high pressure turbine (5) is gas-cooled wall (44)
Entrance, the working medium entrances of outlet working medium connection low-temperature reheater (45) of secondary gas air cooling wall (44), low-temperature reheater (45)
Outlet working medium connection high temperature reheater (46) working medium entrances, the outlet working medium of high temperature reheater (46) and low pressure turbine (6)
Entrance be connected, the hot side entrance of the outlet working medium of low pressure turbine (6) connection high temperature regenerator (3), high temperature regenerator (3)
Hot side outlet is connected to the hot side entrance of cryogenic regenerator (2)；
Boiler First air 1k and Secondary Air 2k from pressure fan respectively with the First air of low-temperature air preheater (410) and secondary
Wind entrance is connected, the First air 1k outlet coal pulverizer inlet of low-temperature air preheater (410), low-temperature air preheater
(410) the outlet Secondary Air 2k is connected with the air intake of high-temperature air preheater (48), high-temperature air preheater (48)
Air intake is connected to boiler-burner bellows entrance.
2. a kind of coal base supercritical CO 2 Brayton cycle electricity generation system according to claim 1, which is characterized in that described
Low temperature superheater (42) and low-temperature reheater (45) are arranged side by side on boiler back end ductwork temperature tune in supercritical CO 2 boiler (4)
Section baffle (47) is located at low temperature superheater (42) and low-temperature reheater (45) bottom；Low-temperature air preheater (410) and flue gas are cold
But device (411) is arranged side by side on boiler back end ductwork, and flue gas waste heat recovery controllable register (412) is located at low-temperature air preheater
(410) with gas cooler (411) bottom.
3. a kind of coal base supercritical CO 2 Brayton cycle electricity generation system according to claim 1, which is characterized in that design
Under operating condition, the outlet smoke temperature of supercritical CO 2 boiler (4) the high temperature air preheater (48) is 320~390 DEG C.
4. a kind of described in any item electricity-generating methods of coal base supercritical CO 2 Brayton cycle electricity generation system of claims 1 to 3,
It is characterized in that,
The hot side outlet working medium of cryogenic regenerator (2) is divided into two-way, is boosted wherein entering recompression machine (7) all the way by compression, separately
The entrance for entering forecooler (8) all the way enters main compressor (1) entrance after being cooled to main compressor inlet temperature, and working medium exists
It is divided into two-way again after compression boosting in main compressor (1), wherein enter the cold side input port of cryogenic regenerator (2) all the way, it is another
Road enters the working medium entrances of the gas cooler (411) in supercritical CO 2 boiler (4), the cold side outlet port work of cryogenic regenerator (2)
Matter enters high temperature regenerator after mixing respectively with the outlet working medium of the outlet working medium of recompression machine (7) and gas cooler (411)
(3) cold side input port, the cold side outlet port working medium of high temperature regenerator (3) enter the primary gas air cooling wall of supercritical CO 2 boiler (4)
(41) it absorbs heat, subsequently enters low temperature superheater (42) heat absorption, the outlet working medium of last low temperature superheater (42) enters hyperthermia and superheating
Device (43) completes heat absorption, and high temperature superheater (43) the outlet working medium after the completion of absorbing heat enters high pressure turbine (5) expansion work and right
Outer output electric energy, high pressure turbine (5) the outlet working medium after completing acting are again introduced into the secondary gas gas of supercritical CO 2 boiler (4)
Cold wall (44) heat absorption, the outlet working medium of secondary gas air cooling wall (44) enter back into low-temperature reheater (45) heat absorption, last cold reheat
The outlet working medium of device (45) enters high temperature reheater (46) and completes heat absorption, the outlet work of the high temperature reheater (46) after completing heat absorption
Matter enters low pressure turbine (6) expansion work and externally exports electric energy, and low pressure turbine (6) the outlet working medium after completing acting enters height
The hot side entrance of warm regenerator (3), the hot side outlet working medium of high temperature regenerator (3) enter the hot side entrance of cryogenic regenerator (2)；
In supercritical CO 2 boiler (4), temperature controllable register (47) is used to adjust the secondary temperature degree into low pressure turbine (6), leads to
Overregulating temperature controllable register (47) changes the exhaust gas volumn in flue into low-temperature reheater (45) side, to play adjusting
The effect of secondary temperature degree；By adjusting flue gas waste heat recovery controllable register (412), so that into low-temperature air preheater
(410) flue gas flow of side and gas cooler (411) side changes, and improves boiler to play and reduce exhaust gas temperature
The purpose of the thermal efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583810.7A CN110230518B (en) | 2019-07-01 | 2019-07-01 | Coal-based supercritical CO 2 Brayton cycle power generation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583810.7A CN110230518B (en) | 2019-07-01 | 2019-07-01 | Coal-based supercritical CO 2 Brayton cycle power generation system and method |
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