CN115234333A - Thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam - Google Patents
Thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam Download PDFInfo
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- CN115234333A CN115234333A CN202210730181.8A CN202210730181A CN115234333A CN 115234333 A CN115234333 A CN 115234333A CN 202210730181 A CN202210730181 A CN 202210730181A CN 115234333 A CN115234333 A CN 115234333A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000010248 power generation Methods 0.000 title claims abstract description 81
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 65
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 65
- 230000004087 circulation Effects 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003245 coal Substances 0.000 claims description 11
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 39
- 238000003303 reheating Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
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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
- F01K13/00—General layout or general methods of operation of complete plants
-
- 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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam comprises a steam power generation system, a boiler and a supercritical carbon dioxide power generation system; the water outlet of a high-pressure heater of the steam power generation system is connected with the inlet of an economizer of a boiler, and the outlet of a superheater of the boiler is connected with the inlet of a high-pressure cylinder of a steam turbine of the steam power generation system; a primary gas outlet of a final superheater of the boiler is connected with an inlet of a high-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas outlet of a final reheater of the boiler is connected with an inlet of a low-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas inlet of a low-temperature reheater of the boiler is connected with a primary gas outlet of the high-pressure turbine, and a gas supply outlet of a high-temperature reheater of the supercritical carbon dioxide is connected with a gas inlet of a low-temperature superheater of the boiler. The invention improves the energy utilization efficiency and can realize the gradient utilization of the heat generated by fuel combustion.
Description
Technical Field
The invention relates to a power generation system, in particular to a thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam.
Background
The traditional thermal power generation system based on the steam Rankine cycle is mature and stable, the boiler has high utilization rate of heat released by fuel combustion, but the steam power generation efficiency is difficult to further break through due to the limitation of the Rankine cycle configuration under the existing parameter and material technical level. The novel power cycle using supercritical carbon dioxide as a working medium has the advantages that the physical properties and the cycle characteristics of the working medium are well matched, higher power generation efficiency can be realized under the condition that the same working medium parameters as steam cycle are kept, but the problems of difficult utilization of waste heat of a boiler, low utilization rate of heat released by fuel combustion and the like exist.
In summary, the above systems are used alone as power generation systems, and have disadvantages that the energy utilization efficiency is low, and the heat generated by fuel combustion cannot be effectively utilized.
Disclosure of Invention
The invention provides a thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam for overcoming the defects of the prior art.
A thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam comprises a steam power generation system, a boiler and a supercritical carbon dioxide power generation system; the water outlet of a high-pressure heater of the steam power generation system is connected with the inlet of an economizer of a boiler, and the outlet of a superheater of the boiler is connected with the inlet of a high-pressure cylinder of a steam turbine of the steam power generation system; a primary gas outlet of a final superheater of the boiler is connected with an inlet of a high-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas outlet of a final reheater of the boiler is connected with an inlet of a low-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas inlet of a low-temperature reheater of the boiler is connected with a primary gas outlet of the high-pressure turbine, and a gas supply outlet of a high-temperature reheater of the supercritical carbon dioxide is connected with a gas inlet of a low-temperature superheater of the boiler.
Compared with the prior art, the invention has the beneficial effects that:
the supercritical carbon dioxide and steam double-working-medium circulation power generation system established by the invention shares one boiler as a heat source, is suitable for simultaneously arranging water working medium and supercritical carbon dioxide heating surfaces on the design of a double-working-medium circulation boiler, and the two working media are heated to rated parameters and then enter respective power generation systems to generate power. The invention can realize the gradient utilization of the heat generated by fuel combustion, and further improve the energy utilization efficiency by utilizing the respective characteristics of two cycles. The system can be newly built and can also be used for directly saving the equipment investment of water treatment equipment and a steam turbine generator unit by utilizing the equipment and facility transformation of the existing unit from the perspective of saving the equipment investment.
The technical scheme of the invention is further explained by combining the drawings and the embodiment:
drawings
FIG. 1 is a schematic view of a thermal power generation system according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a thermal power generation system according to embodiment 2 of the present invention.
Detailed Description
The first embodiment is as follows: with reference to fig. 1 to 2, a thermal power generation system with dual cycle of supercritical carbon dioxide and steam according to the present embodiment includes a steam power generation system C, a boiler E, and a supercritical carbon dioxide power generation system D; the water outlet of the high-pressure heater 18 of the steam power generation system C is connected with the coal economizer inlet of the boiler E, and the outlet of the superheater of the boiler is connected with the inlet of the steam turbine high-pressure cylinder 13 of the steam power generation system; a primary gas outlet of a final superheater of the boiler E is connected with an inlet of a high-pressure turbine 20 of the supercritical carbon dioxide power generation system D, a secondary gas outlet of a final reheater of the boiler E is connected with an inlet of a low-pressure turbine 21 of the supercritical carbon dioxide power generation system D, a secondary gas inlet of a low-temperature reheater of the boiler E is connected with a primary gas outlet of the high-pressure turbine 20, and a gas supply outlet of a high-temperature reheater 25 of the supercritical carbon dioxide power generation system D is connected with a gas inlet of a low-temperature superheater of the boiler E.
Further, as shown in fig. 1-2, the generator 27 of the supercritical carbon dioxide power generation system D is connected to the high pressure turbine 20, the high pressure turbine 20 is connected to the low pressure turbine 21, the low pressure turbine 21 is connected to the recompressor 22, the recompressor 22 is connected to the main compressor 24, the main compressor 24 is connected to the cooler 23, the low pressure turbine 21 is connected to the high temperature regenerator 25, and the cooler 23 is connected to the low temperature regenerator 26.
The embodiment combines the characteristics of high supercritical carbon dioxide efficiency in a high-parameter area and high steam power generation efficiency in a low-parameter area, designs a supercritical carbon dioxide and steam dual-medium cycle power generation scheme, and realizes the coupling of Rankine cycle and Brayton cycle of steam power generation. On one hand, the problem that a large-capacity supercritical carbon dioxide boiler is difficult to design under the prior art is solved, the consumption of expensive metal materials by the boiler is reduced, and meanwhile, the heating resistance loss of the supercritical carbon dioxide is greatly reduced and the Brayton cycle efficiency is improved by selectively arranging the efficient heat transfer heating surface of the supercritical carbon dioxide in the boiler. On the other hand, the waste heat of the exhaust gas can still be effectively utilized by the steam boiler, and the defects of the supercritical carbon dioxide power generation system are overcome.
Generally, a generator C19 of the steam power generation system C is connected to a low pressure cylinder 14, the turbine low pressure cylinder 14 is connected to a turbine high pressure cylinder 13, the turbine high pressure cylinder 13 is connected to a high pressure heater 18, the high pressure heater 18 is connected to a deaerator 17, the deaerator 17 is connected to the high pressure heater 18 through a feed water pump 28, the deaerator 17 is connected to the low pressure heater 16, the condenser 15 is connected to the low pressure heater 16, and the condenser 15 is connected to the low pressure heater 16 through a condensate water pump 29.
Based on the above, the technical solution of the present invention is further described below by embodiments:
example 1: the supercritical carbon dioxide power generation system D is a single reheating system, the steam power generation system C of the water working medium is a non-reheating system, and the two systems share a pi-shaped arrangement boiler as shown in figure 1.
The boiler comprises a front flue economizer A1, a rear flue economizer A2, a front flue superheater A3, a rear flue superheater A4, a hearth inner wall superheater A5, a low-temperature reheater A7, a low-temperature superheater A6, a separating screen superheater A8, a screen superheater A9, a final reheater A10 and a final superheater A11;
the water outlet of a high-pressure heater 18 of the steam power generation system is respectively connected with the inlets of a front flue coal economizer A1 and a rear flue coal economizer A2 of the boiler, the outlets of the front flue coal economizer A1 and the rear flue coal economizer A2 are respectively connected with a front flue superheater A3 and a rear flue superheater A4 through a boiler hearth water-cooled wall, the steam outlets of the front flue superheater A3 and the rear flue superheater A4 are respectively connected with a steam turbine high-pressure cylinder 13 of the steam power generation system through a hearth inner wall superheater A5, the outlets of a low-temperature reheater A6 and a low-temperature reheater A7 are respectively connected with a final reheater A10 and a partition screen superheater A8, the partition screen superheater A8 is connected with a screen superheater A9, the screen superheater A9 is connected with a final superheater A11, the primary gas outlet of the final superheater A11 is connected with the inlet of a high-pressure turbine 20 of the supercritical carbon dioxide power generation system, the secondary gas outlet of the reheater A10 is connected with the inlet of a low-pressure turbine 21 of the supercritical carbon dioxide power generation system, the high-temperature gas outlet of the supercritical carbon dioxide system 25 is connected with the secondary gas inlet of the boiler A7, and the secondary gas inlet of the secondary reheater A7 is connected with the secondary gas inlet of the secondary superheater 20.
For the water working medium flow: boiler feed water is preheated by a front flue coal economizer A1 and a rear flue coal economizer A2 which are connected in parallel, undersaturated water enters a water-cooled wall of the boiler to be subjected to phase change and becomes micro superheated steam, then the undersaturated water enters a front flue superheater A3 and a rear flue superheater A4 which are connected in parallel to be heated into superheated steam, the superheated steam further enters a high-pressure steam cylinder 13 to do work after the superheat degree is further improved by a hearth inner wall type superheater A5, a part of steam is pumped out from the middle of a cylinder body of the high-pressure steam cylinder 13 by an air pumping hole and enters the shell side of a high-pressure heater 18 to be heated for feed water, and a small part of rest exhaust steam flow enters a deaerator 17 and a large part of steam flow enters a low-pressure steam cylinder 14 of the steam turbine to continue to do work. The steam entering the turbine low pressure cylinder 14 has part of extracted air entering the shell side of the low pressure heater 16 to heat the condensed water before leaving, and the rest enters the condenser 15 to condense into water. The condensed water is pressurized by a condensed water pump 29, then sequentially passes through the low-pressure heater 16 pipe side and the deaerator 17, is further pressurized by a water feeding pump 28, and is heated by the high-pressure heater 18 pipe side to return to the boiler.
For a supercritical carbon dioxide flow scheme: the boiler feed gas is primarily heated by a low-temperature superheater A6, then further heated by a separating screen type superheater A8 and a screen type superheater A9, and finally heated to the rated temperature of a primary gas outlet in a final superheater A11; the primary gas outlet air flow is acted by the high-pressure turbine 20, the exhaust gas enters the reheating process, the cold reheated gas is primarily heated by the low-temperature reheater A7, then is heated to the required rated secondary gas flow temperature by the final-stage reheater A10 and enters the low-pressure turbine 21 to act, and the exhaust gas of the low-pressure turbine 21 is divided into two air flows after being heated and fed by the high-temperature reheater 25 and the low-temperature reheater 26 in sequence. One air flow is directly boosted by the recompressor 22 and then merged into the middle air supply of the two-stage heat regenerator, the other air flow enters the main compressor 24 for boosting after passing through the cooler 23, and the boosted air supply is returned to the boiler after being heated by the two-stage heat regenerator.
Example 2: the supercritical carbon dioxide power generation system D is a single reheating system, the steam power generation system C of the water working medium is a non-reheating system, and the two systems share one tower-type boiler, as shown in the attached figure 2.
The boiler comprises a secondary superheater B1, a final reheater B2, a final superheater B3, a low-temperature superheater B4, a low-temperature reheater B5, a front flue superheater B6, a rear flue superheater B7, a front flue economizer B8 and a rear flue economizer B9;
an outlet of the secondary superheater B1 is connected with an inlet of a final superheater B3, an outlet of the low-temperature superheater B4 is connected with an inlet of the secondary superheater B1, an inlet of the final reheater B2 is connected with an outlet of the low-temperature reheater B5, outlets of the front flue superheater B6 and the rear flue superheater B7 are respectively connected with inlets of a high-pressure steam turbine cylinder 13 of the steam power generation system, a water outlet of a high-pressure heater 18 of the steam power generation system is respectively connected with inlets of a front flue economizer B8 and a rear flue economizer B9 of the boiler, outlets of the front flue economizer B8 and the rear flue economizer B9 are connected with a cold water wall of a boiler furnace, a gas supply outlet of a high-temperature reheater 25 of supercritical carbon dioxide is connected with an air inlet of the low-temperature superheater B4 of the boiler, a primary gas outlet of the final superheater B3 is connected with an inlet of a high-pressure turbine 20 of the supercritical carbon dioxide power generation system, a secondary gas outlet of the reheater B2 is connected with an inlet of a low-temperature turbine 21 of the supercritical carbon dioxide power generation system, and a secondary gas inlet of a low-temperature reheater B5 of the boiler is connected with a secondary gas outlet of a high-pressure turbine 20.
For the water working medium flow: boiler feed water is preheated by a front flue coal economizer B8 and a rear flue coal economizer B9 which are connected in parallel, undersaturated water enters a water-cooled wall of the boiler to be subjected to phase change and becomes micro superheated steam, then the micro superheated steam enters a front flue superheater B6 and a rear flue superheater B7 which are connected in parallel to be heated into superheated steam and is output to a high-pressure turbine cylinder 13, an air suction opening is arranged in the middle of the high-pressure turbine cylinder 13 to suck partial steam to enter a shell side of a high-pressure heater 18 to heat feed water, a small part of rest exhaust steam enters a deaerator 17, a large part of steam enters a low-pressure turbine cylinder 14 to continue acting, part of steam entering a low-pressure turbine cylinder 15 is sucked before leaving and enters a shell side of a low-pressure heater 16 to heat condensed water, and the rest steam enters a condenser 15 to be condensed into water. The condensed water is boosted by a condensed water pump 29 and then sequentially passes through the pipe side of the low-pressure heater 16 and the deaerator 17, and is further boosted by a feed pump 28 and heated by the pipe side of the high-pressure heater 18 to return to the boiler.
For a supercritical carbon dioxide flow scheme: the boiler feed gas is primarily heated by a low-temperature superheater B4, then is further heated by a secondary superheater B1, and finally is heated to a primary gas rated temperature by a final superheater B3; the primary gas outlet air flow applies work through the high-pressure turbine 20, the exhaust gas enters a reheating process, the cold reheating gas is primarily heated through the low-temperature reheater B5, and then the cold reheating gas is heated to the required rated secondary gas parameters through the final-stage reheater B2. After the secondary air at the outlet of the boiler works at the low-pressure turbine 21, the exhaust gas is heated and fed by the high-temperature heat regenerator 25 and the low-temperature heat regenerator 26 in sequence and then is divided into two air flows. One air flow is directly boosted by the recompressor 22 and then merged into the middle air supply of the two-stage heat regenerator, the other air flow enters the main compressor 24 for boosting after flowing through the cooler 23, and the boosted air supply returns to the boiler after being heated by the two-stage heat regenerator.
Theoretical research shows that the supercritical carbon dioxide Brayton power generation cycle has higher efficiency advantage than a steam Rankine cycle under higher parameters under the condition that the temperature of the working medium is higher than 450 ℃. The supercritical carbon dioxide and steam double-working-medium circulation power generation system established in the embodiment shares one boiler as a heat source, is suitable for simultaneously arranging water working medium and supercritical carbon dioxide heating surfaces on the design of a double-working-medium circulation boiler, and the two working media are heated to rated parameters and then enter respective power generation systems to generate power. The fuel combustion heat gradient utilization device can realize gradient utilization of heat generated by fuel combustion, and further improves energy utilization efficiency by utilizing respective characteristics of two circulations. The system can be newly built and can also be used for directly saving the equipment investment of water treatment equipment and a steam turbine generator unit by utilizing the equipment and facility transformation of the existing unit from the perspective of saving the equipment investment.
The double-working-medium coupling power generation system provided by the embodiment takes a boiler which is a traditional thermal power generation core device as a common heat source. A water working medium and a supercritical carbon dioxide heating surface are arranged on a conventional boiler burning hydrocarbon fuel at the same time. The furnace adopts a water-cooled wall, can be directly applied to a mature steam boiler model selection guide rule (a conventional vertical tube ring membrane wall or a furnace vertical tube ring on a lower furnace spiral tube ring is adopted), and solves the problem of difficult furnace model selection. The boiler back flue also adopts steam cooling enveloping wall, which avoids the problem that the supercritical carbon dioxide is used as enveloping wall cooling working medium, the pressure loss is large, the temperature rise is small, and the influence on the Brayton cycle efficiency of the supercritical carbon dioxide is large. Supercritical carbon dioxide selectively uses the screen type heating surface above the hearth and the horizontal flue, and has the advantages of high heat transfer efficiency, low resistance and the like. The embodiment can realize the paralleling of the high-parameter steam power generation system and the supercritical carbon dioxide power generation system at the same time.
The present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the invention.
Claims (6)
1. A thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam comprises a steam power generation system (C) and a boiler (E), and is characterized in that: the system also comprises a supercritical carbon dioxide power generation system (D);
the water outlet of a high-pressure heater of the steam power generation system (C) is connected with the inlet of an economizer of a boiler (E), and the outlet of a superheater of the boiler (E) is connected with the inlet of a high-pressure cylinder of a steam turbine of the steam power generation system; a primary gas outlet of a final superheater of the boiler (E) is connected with an inlet of a high-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas outlet of a final reheater of the boiler (E) is connected with an inlet of a low-pressure turbine of the supercritical carbon dioxide power generation system, a secondary gas inlet of a low-temperature reheater (6) of the boiler (E) is connected with a primary gas outlet of a high-pressure turbine (20), and a gas supply outlet of a high-temperature reheater (25) of the supercritical carbon dioxide is connected with a gas inlet of a low-temperature superheater of the boiler (E).
2. The thermal power generation system with dual supercritical carbon dioxide and steam cycle according to claim 1, wherein: a generator (27) of the supercritical carbon dioxide power generation system (D) is connected with a high-pressure turbine (20), the high-pressure turbine (20) is connected with a low-pressure turbine (21), the low-pressure turbine (21) is connected with a recompressor (22), the recompressor (22) is connected with a main compressor (24), the main compressor (24) is connected with a cooler (23), the low-pressure turbine (21) is connected with a high-temperature heat regenerator (25), and the cooler (23) is connected with a low-temperature heat regenerator (26).
3. The thermal power generation system with dual cycle of supercritical carbon dioxide and steam according to claim 1 or 2, wherein: the boiler is a pi-shaped boiler.
4. The thermal power generation system with dual supercritical carbon dioxide and steam cycle according to claim 3, wherein: the boiler comprises a front flue economizer A (1), a rear flue economizer A (2), a front flue superheater A (3), a rear flue superheater A (4), a hearth inner wall type superheater A (5), a low-temperature reheater A (6), a low-temperature superheater A (7), a separating screen type superheater A (8), a screen type superheater A (9), a final-stage reheater A (10) and a final-stage superheater A (11);
the water outlet of a high-pressure heater (18) of the steam power generation system is respectively connected with the inlets of a front flue coal economizer A (1) and a rear flue coal economizer A (2) of the boiler, the system comprises a front flue economizer A (1) and a rear flue economizer A (2), wherein outlets of the front flue economizer A (1) and the rear flue economizer A (2) are respectively connected with a front flue superheater A (3) and a rear flue superheater A (4) through a boiler hearth water-cooled wall, steam outlets of the front flue superheater A (3) and the rear flue superheater A (4) are respectively connected with a steam turbine high-pressure cylinder (13) of a steam power generation system through a hearth inner wall superheater A (5), outlets of a low-temperature reheater A (6) and a low-temperature superheater A (7) are respectively connected with a final reheater A (10) and a separating screen superheater A (8), the separating screen superheater A (8) is connected with a screen superheater A (9), the screen superheater A (9) is connected with a final superheater A (11), a primary gas outlet of the final superheater A (11) is connected with an inlet of a high-pressure turbine (20) of a supercritical carbon dioxide power generation system, a secondary gas outlet of the secondary gas superheater A (10) is connected with an inlet of a low-pressure turbine (21) of the supercritical carbon dioxide power generation system, a high-temperature reheater (25) is connected with a secondary gas inlet of a secondary gas supply outlet of a supercritical carbon dioxide power generation system, and a secondary reheater A (7) of a secondary gas supply inlet of a secondary superheater is connected with a secondary gas inlet of a secondary superheater.
5. The thermal power generation system with dual supercritical carbon dioxide and steam cycle according to claim 1 or 2, wherein: the boiler is a tower-type boiler.
6. The dual supercritical carbon dioxide and steam cycle thermal power generation system of claim 5, wherein: the boiler comprises a secondary superheater B (1), a final reheater B (2), a final superheater B (3), a low-temperature superheater B (4), a low-temperature reheater B (5), a front flue superheater B (6), a rear flue superheater B (7), a front flue economizer B (8) and a rear flue economizer B (9);
the outlet of the secondary superheater B (1) is connected with the inlet of the final superheater B (3), the outlet of the low-temperature superheater B (4) is connected with the inlet of the secondary superheater B (1), the inlet of the final reheater B (2) is connected with the outlet of the low-temperature reheater B (5), the outlets of the front flue superheater B (6) and the rear flue superheater B (7) are respectively connected with the inlets of a high-pressure steam cylinder (13) of a steam turbine of a steam power generation system, the water outlet of a high-pressure heater (18) of the steam power generation system is respectively connected with the inlets of a front flue economizer B (8) and a rear flue economizer B (9) of a boiler, the outlets of the front flue economizer B (8) and the rear flue economizer B (9) are connected with a water cooling wall of a boiler furnace, the gas outlet of a high-temperature supercritical carbon dioxide supply device (25) is connected with the gas inlet of the low-temperature superheater B (4) of the boiler, the primary gas outlet of the final superheater B (3) is connected with the inlet of a high-pressure turbine (20) of the supercritical carbon dioxide power generation system, the outlet of the secondary superheater B (2) is connected with the inlet of the supercritical carbon dioxide system, and the outlet of the secondary superheater B (5) of the low-temperature reheater system is connected with the inlet of the high-temperature reheater inlet of the supercritical carbon dioxide system (20).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115854327A (en) * | 2022-12-23 | 2023-03-28 | 天津大学 | Coal-fired reforming boiler for improving steam parameters of subcritical unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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