CN109372600B - Backheating coal-based supercritical CO 2 Secondary reheating power generation system - Google Patents
Backheating coal-based supercritical CO 2 Secondary reheating power generation system Download PDFInfo
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- CN109372600B CN109372600B CN201811229872.XA CN201811229872A CN109372600B CN 109372600 B CN109372600 B CN 109372600B CN 201811229872 A CN201811229872 A CN 201811229872A CN 109372600 B CN109372600 B CN 109372600B
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- flue gas
- carbon dioxide
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- heat exchanger
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- 238000010248 power generation Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 title claims abstract description 15
- 238000003303 reheating Methods 0.000 title claims abstract description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 238
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000003546 flue gas Substances 0.000 claims abstract description 130
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 121
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 121
- 230000001172 regenerating effect Effects 0.000 claims abstract description 79
- 239000000779 smoke Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims 2
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000002427 irreversible effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- 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
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/40—Combinations of exhaust-steam and smoke-gas preheaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to an improved efficient regenerative coal-based supercritical CO 2 The secondary reheating power generation system comprises a carbon dioxide high-pressure turbine, a carbon dioxide medium-pressure turbine, a carbon dioxide low-pressure turbine, a high-temperature regenerative heater, a low-temperature regenerative heater, a recompressor, a main compressor, a condenser, a coal-fired boiler air preheater, an air preheater flue gas bypass high-temperature heat exchanger, an air preheater flue gas bypass low-temperature heat exchanger, a boiler primary reheater, a boiler secondary reheater and a flue gas heat exchanger cold side bypass. According to the invention, the secondary reheating carbon dioxide power generation system is arranged, so that the cyclic thermal efficiency can be improved by 0.3%; the regenerative heating system for heating carbon dioxide by the flue gas reduces the smoke discharging loss, improves the boiler efficiency by 0.5%, reduces the irreversible heat exchange loss of the regenerative heater for heat transfer, and improves the heat efficiency of the cyclic power generation by about 0.15%. The invention can integrally improve the cycle efficiency of the existing coal-based supercritical carbon dioxide power generation system by more than 1 percent.
Description
Technical Field
The invention is thatBelongs to the technical field of supercritical carbon dioxide power generation, and in particular relates to a regenerative coal-based supercritical CO 2 A secondary reheat power generation system.
Background
The supercritical carbon dioxide power generation system is characterized by stable chemical property, high density, simple circulation system, compact structure, high efficiency and the like, so that the supercritical carbon dioxide power generation system becomes a key point for research at home and abroad in recent years.
From the research results and test systems of supercritical carbon dioxide power generation reported and published in the prior art, the high-efficiency advanced system for generating power by utilizing carbon dioxide in combination with a coal-fired boiler is not more. Firstly, the regenerative system is subject to the high-efficiency heat exchanger, and because the regenerative heater has high pressure and high temperature in the carbon dioxide power generation system, the design difficulty is high, and the improvement of the heat exchange efficiency is also a difficult problem.
And secondly, the current research is not combined with the cascade utilization of the heat of the boiler flue gas, and the high temperature of the boiler flue gas is caused, so that the improvement of the heat efficiency of the whole power generation cycle is influenced.
Therefore, how to simultaneously reduce the exhaust gas temperature of the boiler and improve the efficiency of the boiler under the conditions of ensuring the selection of the regenerative heater and improving the temperature of carbon dioxide medium entering the boiler as much as possible, and then improve the heat efficiency of the whole power generation cycle is a problem to be solved in the research of coal-based supercritical carbon dioxide power generation.
Disclosure of Invention
The invention aims to provide a regenerative coal-based supercritical CO 2 The secondary reheating power generation system is used for wholly or partially heating the carbon dioxide medium entering the regenerative heater by arranging the boiler flue gas high-temperature heat exchanger and the flue gas low-temperature heat exchanger, so that on one hand, irreversible loss of heat exchange temperature difference of the regenerative heater is reduced, and on the other hand, heat loss of boiler flue gas is reduced, and therefore, the cycle thermal efficiency of the whole supercritical carbon dioxide power generation is improved.
The invention provides a regenerative coal-based supercritical CO 2 The secondary reheating power generation system comprises a carbon dioxide high-pressure turbine, a carbon dioxide medium-pressure turbine, a carbon dioxide low-pressure turbine, a high-temperature regenerative heater, a low-temperature regenerative heater and a repressThe system comprises a compressor, a main compressor, a condenser, a coal-fired boiler air preheater, an air preheater flue gas bypass high-temperature heat exchanger, an air preheater flue gas bypass low-temperature heat exchanger, a boiler primary reheater, a boiler secondary reheater and a flue gas heat exchanger cold side bypass;
the carbon dioxide high-pressure turbine, the carbon dioxide medium-pressure turbine and the carbon dioxide low-pressure turbine are connected in sequence, a boiler primary reheater is connected between the carbon dioxide high-pressure turbine and the carbon dioxide medium-pressure turbine, and a boiler secondary reheater is connected between the carbon dioxide medium-pressure turbine and the carbon dioxide low-pressure turbine; the carbon dioxide low-pressure turbine is connected with a first inlet of the high-temperature regenerative heater, and a first outlet of the high-temperature regenerative heater is connected with a first inlet of the low-temperature regenerative heater; the inlet of the air preheater of the coal-fired boiler is connected with a main flue gas pipeline, the first inlet of the flue gas bypass high-temperature heat exchanger of the air preheater is connected with the flue gas bypass, the first outlet of the flue gas bypass high-temperature heat exchanger of the air preheater is connected with the first inlet of the flue gas bypass low-temperature heat exchanger of the air preheater, and the first outlet of the flue gas bypass low-temperature heat exchanger of the air preheater and the outlet of the air preheater of the coal-fired boiler are connected with a boiler smoke exhaust pipeline;
the first outlet of the low-temperature regenerative heater is connected with the second inlet of the air preheater flue gas bypass low-temperature heat exchanger through a first pipeline, the first pipeline is provided with a main compressor and a condenser, and the condenser is closer to the first outlet of the low-temperature regenerative heater than the main compressor; the second outlet of the air preheater flue gas bypass low-temperature heat exchanger is connected with the second inlet of the low-temperature regenerative heater through a second pipeline, and the second outlet of the low-temperature regenerative heater is connected with the second inlet of the air preheater flue gas bypass high-temperature heat exchanger through a third pipeline; the second outlet of the air preheater flue gas bypass high-temperature heat exchanger is connected with the second inlet of the high-temperature regenerative heater through a fourth pipeline, and the second outlet of the high-temperature regenerative heater is used for being connected with a boiler economizer; the first outlet of the low-temperature regenerative heater is also connected with a third pipeline through a fifth pipeline, and the fifth pipeline is provided with a recompressor;
the new carbon dioxide steam from the boiler enters a carbon dioxide high-pressure turbine to apply work, the exhaust steam enters a primary reheater of the boiler to be continuously heated, then returns to the carbon dioxide medium-pressure turbine to continuously apply work, the exhaust steam enters a secondary reheater of the boiler to be continuously heated, then returns to enter a carbon dioxide low-pressure turbine to continuously apply work, carbon dioxide discharged after doing work in the carbon dioxide low-pressure turbine enters a high-temperature regenerative heater as a hot side medium to be cooled, carbon dioxide in a flue gas bypass high-temperature heat exchanger of the air preheater is heated by flue gas and enters the high-temperature regenerative heater as a cold side medium to be continuously heated by the exhaust steam of the carbon dioxide low-pressure turbine, the heated carbon dioxide medium enters a boiler economizer to continuously absorb heat to finally become the new carbon dioxide steam to enter the carbon dioxide high-pressure turbine, the first cooled carbon dioxide low-pressure turbine in the high-temperature regenerative heater is exhausted, the cooled carbon dioxide in the low-temperature regenerative heater is taken as a hot side medium to enter a condenser to be continuously cooled, the hot side medium in the low-temperature regenerative heater is taken as a hot side medium to enter an inlet of a recompressor to be compressed, the cold side medium in the low-temperature regenerative heater is mixed with an outlet medium of the recompressor to be taken as a cold side medium to jointly enter an air preheater flue gas bypass high-temperature heat exchanger, the cooled carbon dioxide medium in the condenser is taken as a cold side medium to enter a main compressor to be compressed, the carbon dioxide discharged by the main compressor is taken as a cold side medium to be fully or partially enter the air preheater flue gas bypass low-temperature heat exchanger to be continuously heated by flue gas, the carbon dioxide discharged by the recompressor is taken as a cold side medium to be fully or partially enter the air preheater flue gas bypass high-temperature heat exchanger to be heated by flue gas, carbon dioxide in the air preheater flue gas bypass low-temperature heat exchanger is heated, the carbon dioxide is used as a cold side medium to continuously enter the low-temperature regenerative heater to be heated, flue gas in the air preheater flue gas bypass high-temperature heat exchanger is cooled, the flue gas enters the air preheater flue gas bypass low-temperature heat exchanger to continuously be cooled, boiler flue gas enters the coal-fired boiler air preheater and the flue gas bypass in parallel, in the flue gas bypass, the flue gas is successively cooled by the air preheater flue gas bypass high-temperature heat exchanger and the air preheater flue gas bypass low-temperature heat exchanger, and after the flue gas at the outlet of the coal-fired boiler air preheater is mixed with the flue gas at the outlet of the air preheater flue gas bypass low-temperature heat exchanger, the flue gas is discharged together as boiler flue gas.
Further, a smoke heat exchanger cold side bypass is arranged between the first pipeline and the second pipeline and between the third pipeline and the fourth pipeline, carbon dioxide at the outlet of the compressor directly enters the cold side inlet of the high-temperature regenerative heater through the smoke heat exchanger cold side bypass, and carbon dioxide at the outlet of the main compressor directly enters the cold side inlet of the low-temperature regenerative heater through the smoke heat exchanger cold side bypass.
By the scheme, the coal-based supercritical CO is regenerated 2 The secondary reheating power generation system can be more beneficial to reducing the boiler smoke discharging temperature and smoke discharging loss while realizing high-efficiency regenerative heating, thereby improving the heat efficiency of the whole power generation cycle.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 shows the regenerative coal-based supercritical CO of the present invention 2 And a structural schematic diagram of the secondary reheat power generation system.
Reference numerals in the drawings:
1-a carbon dioxide high pressure turbine; 2-carbon dioxide medium pressure turbine; 3-carbon dioxide low pressure turbine; 4-a high-temperature regenerative heater; 5-a low-temperature regenerative heater; 6-a recompression machine; 7-a main compressor; 8-a condenser; 9-an air preheater of the coal-fired boiler; 10-a high-temperature heat exchanger of a flue gas bypass of the air preheater; 11-the flue gas bypass low-temperature heat exchanger of the air preheater; 12-boiler primary reheater; 13-boiler secondary reheater; 14-cold side bypass of the flue gas heat exchanger.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to FIG. 1, the embodiment provides a regenerative coal-based supercritical CO 2 The secondary reheating power generation system comprises a carbon dioxide high-pressure turbine 1, a carbon dioxide medium-pressure turbine 2, a carbon dioxide low-pressure turbine 3, a high-temperature regenerative heater 4, a low-temperature regenerative heater 5, a recompression 6, a main compressor 7, a condenser 8,The system comprises a coal-fired boiler air preheater 9, an air preheater flue gas bypass high-temperature heat exchanger 10, an air preheater flue gas bypass low-temperature heat exchanger 11, a boiler primary reheater 12, a boiler secondary reheater 13 and a flue gas heat exchanger cold side bypass 14;
the carbon dioxide high-pressure turbine 1, the carbon dioxide medium-pressure turbine 2 and the carbon dioxide low-pressure turbine 3 are connected in sequence, a boiler primary reheater 12 is connected between the carbon dioxide high-pressure turbine 1 and the carbon dioxide medium-pressure turbine 2, and a boiler secondary reheater 13 is connected between the carbon dioxide medium-pressure turbine 2 and the carbon dioxide low-pressure turbine 3; the carbon dioxide low-pressure turbine 3 is connected with a first inlet of the high-temperature regenerative heater 4, and a first outlet of the high-temperature regenerative heater 4 is connected with a first inlet of the low-temperature regenerative heater 5; the inlet of the air preheater 9 of the coal-fired boiler is connected with a main flue gas pipeline, the first inlet of the air preheater flue gas bypass high-temperature heat exchanger 10 is connected with a flue gas bypass, the first outlet of the air preheater flue gas bypass high-temperature heat exchanger 10 is connected with the first inlet of the air preheater flue gas bypass low-temperature heat exchanger 11, and the first outlet of the air preheater flue gas bypass low-temperature heat exchanger 11 and the outlet of the air preheater 9 of the coal-fired boiler are connected with a boiler smoke exhaust pipeline;
the first outlet of the low-temperature regenerative heater 5 is connected with the second inlet of the air preheater flue gas bypass low-temperature heat exchanger 11 through a first pipeline, the first pipeline is provided with a main compressor 7 and a condenser 8, and the condenser 8 is closer to the first outlet of the low-temperature regenerative heater 5 than the main compressor 7; the second outlet of the air preheater flue gas bypass low-temperature heat exchanger 11 is connected with the second inlet of the low-temperature regenerative heater 5 through a second pipeline, and the second outlet of the low-temperature regenerative heater 5 is connected with the second inlet of the air preheater flue gas bypass high-temperature heat exchanger 10 through a third pipeline; the second outlet of the air preheater flue gas bypass high-temperature heat exchanger 10 is connected with the second inlet of the high-temperature regenerative heater 4 through a fourth pipeline, and the second outlet of the high-temperature regenerative heater 4 is used for being connected with heat exchange surfaces such as a boiler economizer; the first outlet of the low-temperature regenerative heater 5 is also connected with a third pipeline through a fifth pipeline, and the fifth pipeline is provided with a recompression machine 6;
the new carbon dioxide steam from the boiler enters the carbon dioxide high-pressure turbine 1 to do work, the exhaust steam enters the primary reheater 12 of the boiler to continue to heat, then returns to the carbon dioxide medium-pressure turbine 2 to continue to do work, the exhaust steam enters the secondary reheater 13 of the boiler to continue to heat, then returns to enter the carbon dioxide low-pressure turbine 3 to continue to do work, the carbon dioxide discharged after doing work in the carbon dioxide low-pressure turbine 3 enters the high-temperature regenerative heater 4 as a hot side medium to be cooled, the carbon dioxide in the air preheater flue gas bypass high-temperature heat exchanger 10 is heated by the flue gas, then enters the high-temperature regenerative heater 4 as a cold side medium to continue to be heated by the exhaust steam of the carbon dioxide low-pressure turbine 3, the heated carbon dioxide medium enters the heat exchange surfaces such as the boiler economizer to continue to absorb heat, and finally becomes the new carbon dioxide steam to enter the carbon dioxide high-pressure turbine 1, the carbon dioxide low-pressure turbine 3 cooled for the first time in the high-temperature regenerative heater 4 discharges steam as a hot side medium, the carbon dioxide cooled in the low-temperature regenerative heater 5 continuously cools as a hot side medium, the hot side medium in the low-temperature regenerative heater 5 enters the condenser 8, the inlet of the recompressor 6 is compressed by the medium, the cold side medium in the low-temperature regenerative heater 5 is mixed with the outlet medium of the recompression 6, the mixture is taken as a cold side medium and jointly enters the air preheater flue gas bypass high-temperature heat exchanger 10, the cooled carbon dioxide medium in the condenser 8 enters the main compressor 7 to be compressed, the carbon dioxide discharged by the main compressor 7 is taken as a cold side medium, all or part of the carbon dioxide discharged by the recompression 6 enters the air preheater flue gas bypass low-temperature heat exchanger 11 to be continuously heated by flue gas and is taken as a cold side medium, all or part of the flue gas enters the air preheater flue gas bypass high-temperature heat exchanger 10 to be heated by flue gas, carbon dioxide in the air preheater flue gas bypass low-temperature heat exchanger 11 is heated, the flue gas continuously enters the low-temperature regenerative heater 5 to be heated as a cold side medium, the flue gas in the air preheater flue gas bypass high-temperature heat exchanger 10 is cooled, the flue gas continuously enters the air preheater flue gas bypass low-temperature heat exchanger 11 to be cooled, boiler flue gas enters the coal-fired boiler air preheater 9 and the flue gas bypass in parallel, in the flue gas bypass, the flue gas is successively cooled by the air preheater flue gas bypass high-temperature heat exchanger 10 and the air preheater flue gas bypass low-temperature heat exchanger 11, and the flue gas at the outlet of the coal-fired boiler air preheater 9 is mixed with the flue gas at the outlet of the air preheater flue gas bypass low-temperature heat exchanger 11 and then discharged together as boiler flue gas.
In this embodiment, a cold side bypass 14 of the flue gas heat exchanger is disposed between the first pipeline and the second pipeline, and between the third pipeline and the fourth pipeline, the cold sides of the high-temperature heat exchanger 10 and the low-temperature heat exchanger 11 of the flue gas bypass of the air preheater, namely, the carbon dioxide side, are in parallel connection with the cold side bypass 14 of the flue gas heat exchanger, the cold side carbon dioxide working medium can directly enter downstream equipment without passing through the high-temperature heat exchanger 10 of the flue gas bypass of the air preheater and the low-temperature heat exchanger 11 of the flue gas bypass of the air preheater, carbon dioxide at the outlet of the recompression 6 can directly enter the cold side inlet of the high-temperature regenerative heater 4 through the cold side bypass 14 of the flue gas heat exchanger, and carbon dioxide at the outlet of the main compressor 7 can directly enter the cold side inlet of the low-temperature regenerative heater 5 through the cold side bypass 14 of the flue gas heat exchanger.
The embodiment provides the regenerated coal-based supercritical CO 2 The secondary reheating power generation system is provided with at least three turbines, namely a carbon dioxide high-pressure turbine 1, a carbon dioxide medium-pressure turbine 2, a carbon dioxide low-pressure turbine 3 and the like, and the parameters of the secondary reheating new steam can reach the grade of 700-1200 ℃ and 35 MPa. Carbon dioxide is used as a medium of power generation circulation, compressed and warmed by the main compressor 7 and the recompressor 6, is not only heated step by carbon dioxide exhaust steam of the carbon dioxide low-pressure turbine 3, but also heated step by the flue gas of the coal-fired boiler in the air preheater flue gas bypass high-temperature heat exchanger 10 and the air preheater flue gas bypass low-temperature heat exchanger 11, and the temperature of the carbon dioxide entering the coal-fired boiler reaches approximately 520 ℃ or even higher by two different regenerative heating modes of the turbine side and the boiler side so as to improve the temperature of the initial carbon dioxide medium entering the boiler, and can improve the thermal efficiency of the circulating power generation by approximately 0.3 percent.
Meanwhile, the flue gas heat exchanger is arranged to heat the carbon dioxide medium, so that the flue gas temperature of the flue gas discharged by the coal-fired boiler is further reduced, the flue gas loss is reduced, the boiler efficiency is improved by 0.5%, the flue gas heat is further utilized to heat the carbon dioxide medium, the temperature of working media entering the regenerative heater is improved, the average heat exchange temperature difference in the high-temperature regenerative heater 4 and the low-temperature regenerative heater 5 can be reduced to be less than 3 ℃, the irreversible heat exchange loss is reduced, the effective efficiency of the whole power generation cycle is improved, and the cyclic power generation heat efficiency is also improved by about 0.15%. The system can integrally improve the cycle efficiency of the existing coal-based supercritical carbon dioxide power generation system by more than about 1 percent.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (2)
1. Backheating coal-based supercritical CO 2 The secondary reheating power generation system is characterized by comprising a carbon dioxide high-pressure turbine, a carbon dioxide medium-pressure turbine, a carbon dioxide low-pressure turbine, a high-temperature regenerative heater, a low-temperature regenerative heater, a recompressor, a main compressor, a condenser, a coal-fired boiler air preheater, an air preheater flue gas bypass high-temperature heat exchanger, an air preheater flue gas bypass low-temperature heat exchanger, a boiler primary reheater, a boiler secondary reheater and a flue gas heat exchanger cold side bypass;
the carbon dioxide high-pressure turbine, the carbon dioxide medium-pressure turbine and the carbon dioxide low-pressure turbine are connected in sequence, the boiler primary reheater is connected between the carbon dioxide high-pressure turbine and the carbon dioxide medium-pressure turbine, and the boiler secondary reheater is connected between the carbon dioxide medium-pressure turbine and the carbon dioxide low-pressure turbine; the carbon dioxide low-pressure turbine is connected with the first inlet of the high-temperature regenerative heater, and the first outlet of the high-temperature regenerative heater is connected with the first inlet of the low-temperature regenerative heater; the inlet of the air preheater of the coal-fired boiler is connected with a main flue gas pipeline, the first inlet of the air preheater flue gas bypass high-temperature heat exchanger is connected with a flue gas bypass, the first outlet of the air preheater flue gas bypass high-temperature heat exchanger is connected with the first inlet of the air preheater flue gas bypass low-temperature heat exchanger, and the first outlet of the air preheater flue gas bypass low-temperature heat exchanger and the outlet of the air preheater of the coal-fired boiler are connected with a boiler smoke exhaust pipeline;
the first outlet of the low-temperature regenerative heater is connected with the second inlet of the air preheater flue gas bypass low-temperature heat exchanger through a first pipeline, the first pipeline is provided with a main compressor and a condenser, and the condenser is closer to the first outlet of the low-temperature regenerative heater than the main compressor; the second outlet of the air preheater flue gas bypass low-temperature heat exchanger is connected with the second inlet of the low-temperature regenerative heater through a second pipeline, and the second outlet of the low-temperature regenerative heater is connected with the second inlet of the air preheater flue gas bypass high-temperature heat exchanger through a third pipeline; the second outlet of the air preheater flue gas bypass high-temperature heat exchanger is connected with the second inlet of the high-temperature regenerative heater through a fourth pipeline, and the second outlet of the high-temperature regenerative heater is used for being connected with a boiler economizer; the first outlet of the low-temperature regenerative heater is also connected with the third pipeline through a fifth pipeline, and the fifth pipeline is provided with a recompressor;
carbon dioxide new steam from a boiler enters a carbon dioxide high-pressure turbine to do work, exhaust steam enters a primary reheater of the boiler to continue heating, then returns to the carbon dioxide intermediate-pressure turbine to continue doing work, exhaust steam enters a secondary reheater of the boiler to continue heating, then returns to enter a carbon dioxide low-pressure turbine to continue doing work, carbon dioxide discharged after doing work in the carbon dioxide low-pressure turbine enters the high-temperature recuperator as a hot side medium to be cooled, carbon dioxide in the air preheater flue gas bypass high-temperature heat exchanger is heated by flue gas and enters the high-temperature recuperator as a cold side medium to continue being heated by the carbon dioxide low-pressure turbine exhaust steam, the heated carbon dioxide medium enters a boiler economizer to continue absorbing heat and finally becomes carbon dioxide new steam to enter the carbon dioxide high-pressure turbine, the carbon dioxide low-pressure turbine exhaust steam cooled for the first time in the high-temperature recuperator enters the low-temperature heater to continue cooling as a hot side medium, the cooled carbon dioxide in the low-temperature recuperator enters the condenser to continue cooling as a cold side medium, the low-temperature side medium enters the condenser to be cooled, the low-temperature preheater is compressed by the cold side medium to enter the air preheater, the cold side medium is compressed by the air compressor, and the air compressor is compressed by the medium in the air compressor and the medium is compressed by the air compressor and the medium, carbon dioxide exhausted by the recompression machine is used as a cold side medium and fully or partially enters the air preheater flue gas bypass high-temperature heat exchanger to be heated by flue gas, carbon dioxide in the air preheater flue gas bypass low-temperature heat exchanger is heated and then continuously enters the low-temperature regenerative heat heater as a cold side medium to be heated, flue gas in the air preheater flue gas bypass high-temperature heat exchanger is cooled and then enters the air preheater flue gas bypass low-temperature heat exchanger to be continuously cooled, boiler flue gas enters the coal-fired boiler air preheater and the flue gas bypass side by side, in the flue gas bypass, the flue gas is cooled by the air preheater flue gas bypass high-temperature heat exchanger and the air preheater flue gas bypass low-temperature heat exchanger in sequence, and the outlet flue gas of the coal-fired boiler air preheater and the outlet flue gas of the air preheater bypass low-temperature heat exchanger are mixed and then discharged together as boiler flue gas.
2. The recuperated coal-based supercritical CO of claim 1 2 The secondary reheating power generation system is characterized in that a smoke heat exchanger cold side bypass is arranged between the first pipeline and the second pipeline and between the third pipeline and the fourth pipeline, carbon dioxide at the outlet of the recompression is directly fed into the cold side inlet of the high-temperature regenerative heater through the smoke heat exchanger cold side bypass, and carbon dioxide at the outlet of the main compressor is directly fed into the cold side inlet of the low-temperature regenerative heater through the smoke heat exchanger cold side bypass.
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| CN113970111B (en) * | 2021-11-12 | 2023-10-31 | 湖南省湘电试验研究院有限公司 | Flue gas waste heat recovery system of thermal power plant |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526576A (en) * | 2016-01-20 | 2016-04-27 | 西安热工研究院有限公司 | Coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system |
| WO2016167445A1 (en) * | 2015-04-16 | 2016-10-20 | 두산중공업 주식회사 | Hybrid generation system using supercritical carbon dioxide cycle |
| CN107989667A (en) * | 2017-12-26 | 2018-05-04 | 华北电力大学 | Integrated supercritical CO2The coal-fired double reheat Turbo-generator Set of circulation |
| CN108661735A (en) * | 2018-04-26 | 2018-10-16 | 华北电力大学 | A kind of supercritical CO of cascade utilization smoke heat energy2Coal circulation burning electricity generation system |
| CN108678822A (en) * | 2018-04-26 | 2018-10-19 | 华北电力大学 | A kind of Novel supercritical CO suitable for coal-fired power generation field2Combined cycle system |
| CN209469462U (en) * | 2018-10-22 | 2019-10-08 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Improved high-efficiency backheat coal base supercritical CO 2 double reheat electricity generation system |
-
2018
- 2018-10-22 CN CN201811229872.XA patent/CN109372600B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016167445A1 (en) * | 2015-04-16 | 2016-10-20 | 두산중공업 주식회사 | Hybrid generation system using supercritical carbon dioxide cycle |
| CN105526576A (en) * | 2016-01-20 | 2016-04-27 | 西安热工研究院有限公司 | Coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system |
| CN107989667A (en) * | 2017-12-26 | 2018-05-04 | 华北电力大学 | Integrated supercritical CO2The coal-fired double reheat Turbo-generator Set of circulation |
| CN108661735A (en) * | 2018-04-26 | 2018-10-16 | 华北电力大学 | A kind of supercritical CO of cascade utilization smoke heat energy2Coal circulation burning electricity generation system |
| CN108678822A (en) * | 2018-04-26 | 2018-10-19 | 华北电力大学 | A kind of Novel supercritical CO suitable for coal-fired power generation field2Combined cycle system |
| CN209469462U (en) * | 2018-10-22 | 2019-10-08 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Improved high-efficiency backheat coal base supercritical CO 2 double reheat electricity generation system |
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