CN113914952B - Transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and operation method - Google Patents
Transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and operation method Download PDFInfo
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- CN113914952B CN113914952B CN202111205677.5A CN202111205677A CN113914952B CN 113914952 B CN113914952 B CN 113914952B CN 202111205677 A CN202111205677 A CN 202111205677A CN 113914952 B CN113914952 B CN 113914952B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 278
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 139
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 139
- 238000004146 energy storage Methods 0.000 title claims abstract description 54
- 238000010248 power generation Methods 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 19
- 238000010168 coupling process Methods 0.000 title claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000000605 extraction Methods 0.000 claims description 23
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000002699 waste material 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
- 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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and an operation method thereof. The system replaces air with carbon dioxide, the critical temperature of the carbon dioxide is 31.1 ℃, liquid storage can be realized at normal temperature, the liquefying difficulty is greatly reduced, meanwhile, the density of the supercritical carbon dioxide is close to that of liquid, the viscosity is close to that of gas, the system has good fluidity and transmission characteristics, the supercritical carbon dioxide is used for replacing air as an energy storage medium, the energy storage density is greatly improved, the scale of the storage system is obviously reduced, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of physical energy storage, and particularly relates to a trans-critical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and an operation method.
Background
With the continuous utilization of energy, the large-scale application of new energy and the large-scale network access of intermittent renewable energy, many energy application problems also occur, and the application of energy storage technology is an effective way for solving the problems. The energy storage technology can assist the dynamic operation of the traditional power generation system, and helps renewable energy to cut peaks and fill valleys and track planned output. At present, the world can mature and apply large-scale energy storage technology only has two types of pumped storage and compressed air energy storage, the pumped storage is limited by geographical positions, specific geological conditions and long-term enough water sources are needed, and the compressed air energy storage depends on steam turbine technology, the supplementary combustion of fossil fuel and a suitable storage cave. Liquid air storage is a major development direction of compressed air energy storage systems, but the air critical temperature is-140.62 ℃, and certain difficulty exists in realizing low-temperature liquid storage and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a power generation peak regulation system of a transcritical carbon dioxide energy storage coupling steam turbine and an operation method thereof, so as to solve the problem that low-temperature liquid storage is difficult to realize in an air energy storage system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system comprises a boiler and a carbon dioxide compressor;
the steam output end of the boiler is connected to the steam turbine, the exhaust steam outlet of the steam turbine is connected to the condenser, the condensed water outlet of the condenser is connected to the cold side inlet of the first heat exchanger, the cold side outlet of the first heat exchanger is connected to the water side inlet of the heat regenerator, and the water side outlet of the heat regenerator is connected with the boiler;
the outlet of the carbon dioxide compressor is connected with the hot side inlet of the first heat exchanger, the hot side outlet of the first heat exchanger is connected with the inlet of the supercritical carbon dioxide storage tank, the outlet of the supercritical carbon dioxide storage tank is connected with the cold side inlet of the second heat exchanger, the cold side outlet of the second heat exchanger is connected with the turbine, and the outlet of the turbine is connected with the cold accumulator; the first output pipeline of the regenerator is connected to a liquid carbon dioxide storage tank, the outlet of the liquid carbon dioxide storage tank is connected with the second input pipeline of the regenerator, and the second output pipeline of the regenerator is connected with the inlet of the carbon dioxide compressor;
the steam extraction output by the steam turbine is divided into a first steam extraction pipeline and a second steam extraction pipeline, the first steam extraction pipeline is connected with the heat regenerator, and the second steam extraction pipeline is connected with a hot side inlet of the second heat exchanger; the hot side outlet of the second heat exchanger is connected with the steam side inlet of the heat regenerator;
the power output end of the turbine is connected with a first generator, and the power output end of the turbine is connected with a second generator.
The invention further improves that:
preferably, a condensate pump is arranged on the condensate outlet of the condenser and the cold side inlet connecting pipeline of the first heat exchanger.
Preferably, a water feeding pump is arranged on the cold side outlet of the first heat exchanger and the water side inlet connecting pipeline of the heat regenerator.
Preferably, a first electric stop valve is arranged on the second steam extraction pipeline.
Preferably, the carbon dioxide compressor is connected with an electric motor.
Preferably, a second electric stop valve is arranged on a connecting pipeline between the inlet of the supercritical carbon dioxide storage tank and the hot side outlet of the first heat exchanger.
Preferably, an electric throttle valve is arranged on a connecting pipeline between the outlet of the supercritical carbon dioxide storage tank and the cold side inlet of the second heat exchanger.
Preferably, a third electric stop valve is arranged on the first output pipeline of the cold accumulator.
Preferably, a first electric throttle valve is arranged on the second input pipeline of the cold accumulator.
An operation method of the power generation peak regulation system of the transcritical carbon dioxide energy storage coupling steam turbine,
when the steam turbine is in normal operation, the boiler inputs steam into the steam turbine, the steam turbine drives the first generator to generate power, and after exhaust steam exhausted by the steam turbine is cooled into condensate water through the condensate pump, the condensate water enters the first heat exchanger; the output steam extraction part of the steam turbine enters a heat regenerator, and condensed water output from the first heat exchanger returns to the boiler after the heat regenerator is heated;
when the generated energy of the first generator needs to be reduced, the steam turbine operates normally, and the redundant electric quantity output by the first generator drives the carbon dioxide compressor to work; the method comprises the steps that liquid carbon dioxide in a liquid carbon dioxide storage tank enters a cold accumulator to absorb heat and gasify to form gaseous carbon dioxide, the gaseous carbon dioxide enters a carbon dioxide compressor to be compressed to form high-pressure high-temperature carbon dioxide, and the high-pressure high-temperature carbon dioxide enters a first heat exchanger to be cooled by condensation water and is stored in a supercritical carbon dioxide storage tank;
when the generated energy of the first generator needs to be increased, the turbine operates normally, the supercritical carbon dioxide storage tank outputs gaseous carbon dioxide, the gaseous carbon dioxide enters the second heat exchanger to absorb heat, the absorbed gaseous carbon dioxide enters the turbine to apply work, and the turbine drives the second generator to generate power; the carbon dioxide after doing work is cooled to liquid state through a cold accumulator and then stored in a carbon dioxide liquid storage tank.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system, which comprises a steam turbine steam cycle power generation system and a transcritical carbon dioxide energy storage system, wherein energy storage compression heat in the transcritical carbon dioxide energy storage system is used for heating condensation water, high-temperature high-pressure steam is used for heating high-pressure low-temperature carbon dioxide in an energy release stage, the carbon dioxide in the energy release stage is prevented from being heated by collecting compression heat by a heat accumulator, and the economy of a unit is improved. The system replaces air with carbon dioxide, the critical temperature of the carbon dioxide is 31.1 ℃, liquid storage can be realized at normal temperature, the liquefying difficulty is greatly reduced, meanwhile, the density of the supercritical carbon dioxide is close to that of liquid, the viscosity is close to that of gas, the system has good fluidity and transmission characteristics, the supercritical carbon dioxide is used for replacing air as an energy storage medium, the energy storage density is greatly improved, the scale of the storage system is obviously reduced, and the cost is reduced. The invention adopts a transcritical carbon dioxide energy storage technology to store low-pressure carbon dioxide in a liquid state, increases the energy storage density, reduces the occupied area and improves the flexibility of the unit. Energy saving and environment protection, large energy storage density, small occupied area and high flexibility.
The invention also discloses an operation method of the transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system, which utilizes the energy storage compression heat in the transcritical carbon dioxide energy storage system to heat the condensed water, adopts high-temperature high-pressure steam to heat high-pressure low-temperature carbon dioxide in the energy release stage, avoids adopting a heat accumulator to collect the compression heat to heat the carbon dioxide in the energy release stage, and improves the economy of the unit. The high-pressure high-temperature carbon dioxide at the outlet of the compressor in the transcritical carbon dioxide energy storage system enters the first heat exchanger to heat the condensed water, so that the temperature of the condensed water is increased, the heat exchange temperature difference in the heat regenerator is reduced, the irreversible loss in the heat exchange process is reduced, the energy efficiency of the unit is improved, and meanwhile, the compression heat in the process of compressing the carbon dioxide is recovered, so that the waste of heat is reduced. The high-pressure low-temperature carbon dioxide in the energy release stage of the transcritical carbon dioxide energy storage system is heated by utilizing the high pressure and the high pressure Wen Chouqi in the cylinder of the steam turbine, so that the working capacity of the carbon dioxide is improved, and the generating capacity of the unit is increased.
Drawings
FIG. 1 shows a power generation peak shaving system of a transcritical carbon dioxide energy storage coupling steam turbine.
In fig. 1: 1-a boiler; 2-a steam turbine; 3-a condenser; 4-a condensate pump; 5-a first heat exchanger; 6-a water supply pump; 7-a heat regenerator; 8-a first electric shut-off valve; 9-a carbon dioxide compressor; 10-a second electric shut-off valve; 11-a supercritical carbon dioxide storage tank; 12-a second electrically operated throttle valve; 13-a second heat exchanger; 14-turbine; 15-a cooler; 16-a regenerator; 17-a third electric shut-off valve; 18-a first electrically operated throttle valve; 19-a liquid carbon dioxide storage tank; 20-a first generator; 21-a second generator; 22-an electric motor; 23-a first steam extraction pipeline; 24-a second steam extraction pipeline.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention discloses a transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system which mainly comprises a steam turbine steam cycle power generation system and a transcritical carbon dioxide energy storage system.
As shown in fig. 1, the steam turbine steam cycle power generation system includes a boiler 1, a steam turbine 2, a condenser 3, condensate water 4, a first heat exchange 5, a feed pump 6, a regenerator 7, and a first generator 20.
Specifically, the outlet of the boiler 1 is communicated with the inlet of the steam turbine 2, the exhaust steam outlet of the steam turbine 2 is communicated with the hot side inlet of the condenser 3, and the power output shaft of the steam turbine 2 is connected with the first generator 20 to drive the first generator 20 to work. The exhaust steam is cooled in the condenser 3 to form condensate, a condensate outlet of the condenser 3 is communicated with an inlet of the condensate pump 4, an outlet of the condensate pump 4 is communicated with a cold side inlet of the first heat exchanger 5, a cold side outlet of the first heat exchanger 5 is communicated with an inlet of the water feeding pump 6, an outlet of the water feeding pump 6 is communicated with a water side of the heat regenerator 7, and a water side outlet of the heat regenerator 7 is connected with the boiler 1.
The extraction steam output from the steam turbine 2 cylinder is divided into two streams, namely a first extraction steam pipeline 23 and a second extraction steam pipeline 24, the first extraction steam pipeline 23 is communicated with the hot side inlet of the heat regenerator 7, and enters the heat regenerator 7 to heat water supply; the second steam extraction pipeline 24 is communicated with the hot side of the second heat exchanger 13, and a first electric stop valve 8 is arranged on the second steam extraction pipeline 24 and is used for heating high-pressure carbon dioxide in the energy release stage of the supercritical carbon dioxide energy storage system and then returning into the heat regenerator 7. The two extracted steam are collected into the heat regenerator 7, the extracted steam is cooled in the second heat exchanger 13, but still in a gaseous state, enters the heat regenerator 7 and is further cooled and condensed into water, and enters the boiler for heating through a drainage pipeline in the heat regenerator 7
As shown in fig. 1, the transcritical carbon dioxide energy storage system includes a carbon dioxide compressor 9, a supercritical carbon dioxide storage tank 11, a second heat exchanger 13, a turbine 14, a cooler 15, a regenerator 16, a liquid carbon dioxide storage tank 19, a second generator 21, and an electric motor 22.
The outlet of the carbon dioxide compressor 9 is communicated with the hot side inlet of the first heat exchanger 5, the inlet of the supercritical carbon dioxide storage tank 11 is communicated with the hot side outlet of the first heat exchanger 5 through a pipeline, and a second electric stop valve 10 is arranged on the connecting pipeline; the outlet of the supercritical carbon dioxide storage tank 11 is communicated with the cold side inlet of the second heat exchanger 13 through a pipeline, and a second electric throttle valve 12 is arranged on the connecting pipeline; the hot side inlet of the second heat exchanger 13 is communicated with the second steam extraction pipeline 24, the hot side outlet of the second heat exchanger 13 is communicated with the steam side of the first heat exchanger 7, the cold side outlet of the second heat exchanger 13 is communicated with the inlet of the turbine 14, the outlet of the turbine 12 is communicated with the hot side inlet of the cooler 15, the power output shaft of the turbine 14 is connected with the second generator 21, and the second generator 21 is driven to generate electricity. The outlet of the cooler 15 is connected with a first input pipeline of the regenerator 16, a first output pipeline of the regenerator 16 is connected with the inlet of the liquid carbon dioxide storage tank 19, and a third electric stop valve 17 is arranged on the first output pipeline; the outlet of the liquid carbon dioxide storage tank 19 is connected with a second input pipeline of the cold accumulator 16, a first electric throttle valve 18 is arranged on the second input pipeline, and a second output pipeline of the cold accumulator 16 is communicated with a carbon dioxide inlet of the carbon dioxide compressor 9.
The working principle of the invention is as follows:
superheated steam at the outlet of a boiler 1 in a steam turbine steam cycle power generation system enters a steam turbine 2 to expand and do work to drive a first generator 20 to generate power, steam discharged by the steam turbine 2 enters a condenser 3 to be condensed, then enters the cold side of a first heat exchanger 5 through a condensate pump 4 to exchange heat with high-pressure and high-temperature carbon dioxide in a transcritical carbon dioxide energy storage system, heated condensate water enters a regenerator 7 to exchange heat with high-pressure and high-Wen Chouqi from a steam turbine after being pressurized by a feed pump 6, and then returns to the boiler 1 to complete the steam turbine steam power generation cycle.
The outlet pipeline of the condensate pump 4 is communicated with the cold side inlet of the first heat exchanger 5, and the outlet of the carbon dioxide compressor 9 in the transcritical carbon dioxide energy storage system is communicated with the hot side inlet of the first heat exchanger 5.
In the energy storage stage of the transcritical carbon dioxide energy storage system, after the pressure of liquid carbon dioxide is reduced by a first electric throttle valve 18, the liquid carbon dioxide enters a cold accumulator 16 to absorb heat and gasify, meanwhile cold energy is stored in the cold accumulator 16, gasified carbon dioxide enters a carbon dioxide compressor 9 to be compressed, then enters a first heat exchanger 5 to be cooled at the hot side, and then passes through a second electric stop valve 10 to be stored in a supercritical carbon dioxide storage tank 11; in the energy release stage, the carbon dioxide discharged from the supercritical carbon dioxide storage tank 11 enters the cold side of the second heat exchanger 13 after being throttled by the second electric throttle valve 12, is heated by high pressure and high pressure Wen Chouqi, enters the turbine 14 to expand and do work to drive the second generator 21 to generate electricity, and the supercritical carbon dioxide after energy release is cooled to room temperature through the cooler 15, is cooled to liquid state through the cold accumulator 16 and is stored in the carbon dioxide liquid storage tank 19.
The operation method of the power generation peak shaving system of the transcritical carbon dioxide energy storage coupling steam turbine based on the invention comprises the following steps:
normally, the first electric shutoff valve 8, the second electric shutoff valve 10, the third electric shutoff valve 17, the first electric throttle valve 18, and the second electric throttle valve 12 are closed. The superheated steam from the boiler 1 enters a steam turbine 2 to expand and do work to drive a first generator 20 to generate power, part of steam is extracted from the cylinder of the steam turbine 2 and enters a heat regenerator 7 to be subjected to steam measurement and heating to supply water, the steam discharged by the steam turbine 2 enters a condenser 3 to be condensed into condensed water, and the condensed water sequentially passes through a condensed water pump 4, a first heat exchanger 5 and a water supply pump 6 and then enters the water side of the heat regenerator 7, and at the moment, the supercritical carbon dioxide energy storage system is in a closed state, so that the condensed water does not have heat exchange in the first heat exchanger 5; the feed water at the outlet of the heat regenerator 7 is returned to the boiler 1 to complete the steam cycle power generation of the steam turbine. The state enables the transcritical carbon dioxide energy storage system to be in a closed state, and only maintains the normal operation of the steam turbine steam cycle power generation system.
When the power generation amount of the first generator 20 needs to be reduced, the second electric shutoff valve 10 and the first electric throttle valve 18 are opened, and the remaining valves are maintained in a closed state. The steam turbine steam cycle power generation system normally operates, the redundant electric energy is used for driving the carbon dioxide compressor 9 to work through the motor 22 when the load meeting the power grid requirement is generated by the steam turbine steam cycle power generation system, liquid carbon dioxide is depressurized through the first electric throttle valve 18 and then enters the cold accumulator 16 to absorb heat and gasify, meanwhile cold energy is stored in the cold accumulator 16, gasified carbon dioxide enters the carbon dioxide compressor 9 to be compressed to a preset pressure, high-pressure high-temperature carbon dioxide enters the hot side of the first heat exchanger 5 to heat condensation water, cooled carbon dioxide is stored in the supercritical carbon dioxide storage tank 11 through the second electric stop valve 10, and after the energy storage is finished, the first electric throttle valve 18 is closed and then the second electric stop valve 10 is closed.
When the power generation amount of the first power generator 20 needs to be increased, the first electric shutoff valve 8, the second electric throttle valve 12, and the third electric shutoff valve 17 are opened, and the remaining valves are maintained in the closed state. The steam turbine steam cycle power generation system operates normally. The carbon dioxide from the supercritical carbon dioxide storage tank 11 enters the cold side of the second heat exchanger 13 after being throttled by the first electric throttle valve 12, exchanges heat with high-pressure high-temperature steam from the steam turbine cylinder, then enters the turbine 14 to expand and do work so as to drive the second generator 21 to generate electricity and increase the generated energy, the carbon dioxide from the turbine 14 is cooled to room temperature by the cooler 15, then is cooled to liquid state by the cold accumulator 16 and stored in the carbon dioxide liquid storage tank 19, and after energy release is finished, the first electric stop valve 18 and the second electric throttle valve 12 are closed, and then the third electric stop valve 17 is closed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The trans-critical carbon dioxide energy storage coupling steam turbine power generation peak shaving system is characterized by comprising a boiler (1) and a carbon dioxide compressor (9);
the steam output end of the boiler (1) is connected to the steam turbine (2), the exhaust steam outlet of the steam turbine (2) is connected to the condenser (3), the condensed water outlet of the condenser (3) is connected to the cold side inlet of the first heat exchanger (5), the cold side outlet of the first heat exchanger (5) is connected to the water side inlet of the heat regenerator (7), and the water side outlet of the heat regenerator (7) is connected with the boiler (1);
the outlet of the carbon dioxide compressor (9) is connected with the hot side inlet of the first heat exchanger (5), the hot side outlet of the first heat exchanger (5) is connected with the inlet of the supercritical carbon dioxide storage tank (11), the outlet of the supercritical carbon dioxide storage tank (11) is connected with the cold side inlet of the second heat exchanger (13), the cold side outlet of the second heat exchanger (13) is connected with the turbine (14), and the outlet of the turbine (14) is connected with the regenerator (16); the first output pipeline of the cold accumulator (16) is connected to a liquid carbon dioxide storage tank (19), the outlet of the liquid carbon dioxide storage tank (19) is connected with the second input pipeline of the cold accumulator (16), and the second output pipeline of the cold accumulator (16) is connected with the inlet of the carbon dioxide compressor (9);
the steam extraction output by the steam turbine (2) is divided into a first steam extraction pipeline (23) and a second steam extraction pipeline (24), the first steam extraction pipeline (23) is connected with the heat regenerator (7), and the second steam extraction pipeline (24) is connected with a hot side inlet of the second heat exchanger (13); the hot side outlet of the second heat exchanger (13) is connected with the steam side inlet of the heat regenerator (7);
the power output end of the steam turbine (2) is connected with a first generator (20), and the power output end of the turbine (14) is connected with a second generator (21).
2. The power generation peak shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein a condensate water pump (4) is arranged on a condensate water outlet of the condenser (3) and a cold side inlet connecting pipeline of the first heat exchanger (5).
3. The transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system according to claim 1, wherein a water feeding pump (6) is arranged on a water side inlet connecting pipeline of the cold side outlet of the first heat exchanger (5) and the heat regenerator (7).
4. The transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system according to claim 1, wherein a first electric stop valve (8) is arranged on the second steam extraction pipeline (24).
5. A transcritical carbon dioxide energy storage coupled steam turbine power generation peak shaving system according to claim 1, wherein the carbon dioxide compressor (9) is connected with an electric motor (22).
6. The power generation peak shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein a second electric stop valve (10) is arranged on a connecting pipeline between an inlet of the supercritical carbon dioxide storage tank (11) and a hot side outlet of the first heat exchanger (5).
7. The power generation peak shaving system of the transcritical carbon dioxide energy storage coupling turbine according to claim 1, wherein an electric throttle valve (12) is arranged on a connecting pipeline between an outlet of the supercritical carbon dioxide storage tank (11) and a cold side inlet of the second heat exchanger (13).
8. A transcritical carbon dioxide energy storage coupled steam turbine power generation peak shaving system according to claim 1, characterized in that a third electric shut-off valve (17) is arranged on the first output pipe of the regenerator (16).
9. A transcritical carbon dioxide energy storage coupled turbine power generation peak shaving system according to claim 1, wherein a first electrically operated throttle valve (18) is provided on the second input conduit of the regenerator (16).
10. A method for operating a power generation peak shaver system of a transcritical carbon dioxide energy storage coupling turbine according to claim 1, wherein,
when the steam turbine is in normal operation, the boiler (1) inputs steam into the steam turbine (2), the steam turbine (2) drives the first generator (20) to generate power, and after exhaust steam exhausted by the steam turbine (2) is cooled into condensate water through the condensate pump (4), the condensate water enters the first heat exchanger (5); the output steam extraction part of the steam turbine (2) enters a heat regenerator (7), and condensed water output from the first heat exchanger (5) returns to the boiler (1) after the heat regenerator (7) is heated;
when the generated energy of the first generator (20) needs to be reduced, the steam turbine operates normally, and the redundant electric quantity output by the first generator (20) drives the carbon dioxide compressor (9) to work; the liquid carbon dioxide in the liquid carbon dioxide storage tank (19) enters the cold accumulator (16) to absorb heat and gasify to form gaseous carbon dioxide, the gaseous carbon dioxide enters the carbon dioxide compressor (9) to be compressed to form high-pressure high-temperature carbon dioxide, and the high-pressure high-temperature carbon dioxide enters the first heat exchanger (5) to be cooled by condensation water and then is stored in the supercritical carbon dioxide storage tank (11);
when the generated energy of the first generator (20) needs to be increased, the turbine is operated normally, the supercritical carbon dioxide storage tank (11) outputs gaseous carbon dioxide, the gaseous carbon dioxide enters the second heat exchanger (13) to absorb heat, the absorbed gaseous carbon dioxide enters the turbine (14) to apply work, and the turbine (14) drives the second generator (21) to generate power; the carbon dioxide after doing work is cooled to a liquid state by a cold accumulator (16) and then stored in a liquid carbon dioxide storage tank (19).
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|---|---|---|---|---|
| CN114109549B (en) * | 2022-01-26 | 2022-04-26 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system with cold source and control method thereof |
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