CN113914952A - Power generation peak regulation system of transcritical carbon dioxide energy storage coupling steam turbine and operation method - Google Patents
Power generation peak regulation system of transcritical carbon dioxide energy storage coupling steam turbine and operation method Download PDFInfo
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- CN113914952A CN113914952A CN202111205677.5A CN202111205677A CN113914952A CN 113914952 A CN113914952 A CN 113914952A CN 202111205677 A CN202111205677 A CN 202111205677A CN 113914952 A CN113914952 A CN 113914952A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 288
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 144
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 144
- 238000004146 energy storage Methods 0.000 title claims abstract description 56
- 238000010248 power generation Methods 0.000 title claims abstract description 40
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000000605 extraction Methods 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 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
- 230000006855 networking Effects 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
- 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
Abstract
The invention discloses a transcritical carbon dioxide energy storage coupling steam turbine power generation peak shaving system and an operation method, the system comprises a steam turbine steam cycle power generation system and a transcritical carbon dioxide energy storage system, energy storage compression heat in the transcritical carbon dioxide energy storage system is used for heating condensed water, high-temperature high-pressure steam is used for heating high-pressure low-temperature carbon dioxide in an energy release stage, a heat accumulator is prevented from being used for collecting the compression heat to heat the carbon dioxide in the energy release stage, and the economical efficiency 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 liquefaction difficulty is greatly reduced, meanwhile, the density of the supercritical carbon dioxide is close to liquid, the viscosity is close to 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 power generation peak regulation system of a transcritical carbon dioxide energy storage coupling steam turbine and an operation method.
Background
With the continuous utilization of energy, the large-scale application of new energy and the large-scale networking of intermittent renewable energy, many energy application problems also appear, 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 a traditional power generation system, and helps renewable energy sources to peak clipping, valley filling and tracking planned output. At present, the large-scale energy storage technology which can be applied in the world in a mature mode only comprises pumped storage and compressed air energy storage, the pumped storage is limited by geographical positions and needs specific geological conditions and long-term sufficient water sources, and the compressed air energy storage depends on a steam turbine technology, supplementary combustion of fossil fuel and a cave suitable for storage. Liquid air storage is a main development direction of a compressed air energy storage system, but the critical temperature of air is-140.62 ℃, and certain difficulties exist in the aspects of 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 state storage is difficult to realize in an air energy storage system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a power generation peak regulation system of a transcritical carbon dioxide energy storage coupling steam turbine comprises a boiler and a carbon dioxide compressor;
the steam output end of the boiler is connected to a steam turbine, a waste steam outlet of the steam turbine is connected to a condenser, a condensed water outlet of the condenser is connected to a cold side inlet of a first heat exchanger, a cold side outlet of the first heat exchanger is connected to a water side inlet of a heat regenerator, and a water side outlet of the heat regenerator is connected with the boiler;
an outlet of the carbon dioxide compressor is connected with a hot side inlet of the first heat exchanger, a hot side outlet of the first heat exchanger is connected to an inlet of the supercritical carbon dioxide storage tank, an outlet of the supercritical carbon dioxide storage tank is connected to a cold side inlet of the second heat exchanger, a cold side outlet of the second heat exchanger is connected to the turbine, and an outlet of the turbine is connected to the cold accumulator; a first output pipeline of the cold accumulator is connected to a liquid carbon dioxide storage tank, an outlet of the liquid carbon dioxide storage tank is connected with a second input pipeline of the cold accumulator, and a second output pipeline of the cold accumulator is connected with an inlet of a 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 steam turbine is connected with a first generator, and the power output end of the steam turbine is connected with a second generator.
The invention is further improved in that:
preferably, a condensed water pump is arranged on a condensed water outlet of the condenser and a cold side inlet connecting pipeline of the first heat exchanger.
Preferably, a feed water pump is arranged on a connecting pipeline between the cold side outlet of the first heat exchanger and the water side inlet of the regenerator.
Preferably, a first electric stop valve is arranged on the second steam extraction pipeline.
Preferably, the carbon dioxide compressor is connected with a 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 outlet of the hot side 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 normally operates, steam is input into the steam turbine by the boiler, the steam turbine drives the first generator to generate electricity, exhaust steam discharged by the steam turbine is cooled into condensed water by the condensed water pump, and the condensed 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 being heated by the heat regenerator;
when the power generation amount of the first generator needs to be reduced, the steam turbine normally operates, and redundant electric quantity output by the first generator drives the carbon dioxide compressor to work; liquid carbon dioxide in the 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 condensed water and then is stored in a supercritical carbon dioxide storage tank;
when the power generation capacity of the first generator needs to be increased, the steam turbine normally operates, the supercritical carbon dioxide storage tank outputs gaseous carbon dioxide, the gaseous carbon dioxide enters the second heat exchanger to absorb heat, the gaseous carbon dioxide after heat absorption enters the turbine to do work, and the turbine drives the second generator to generate power; the carbon dioxide after acting is cooled to liquid state by the cold accumulator and then stored in the 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 condensed water, high-temperature high-pressure steam is used for heating high-pressure low-temperature carbon dioxide in an energy release stage, a heat accumulator is used for collecting compression heat to heat the carbon dioxide in the energy release stage, and the economical efficiency 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 liquefaction difficulty is greatly reduced, meanwhile, the density of the supercritical carbon dioxide is close to liquid, the viscosity is close to 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 the transcritical carbon dioxide energy storage technology to store the low-pressure carbon dioxide in a liquid state, thereby increasing the energy storage density, reducing the occupied area and improving the flexibility of the unit. The energy-saving and environment-friendly energy-saving device has the advantages of energy conservation, environmental 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, the method utilizes the stored energy and compression heat in the transcritical carbon dioxide energy storage system to heat the condensed water, and the high-temperature and high-pressure steam is adopted to heat the high-pressure and low-temperature carbon dioxide in the energy release stage, so that the condition that a heat accumulator is adopted to collect the compression heat to heat the carbon dioxide in the energy release stage is avoided, and the economical efficiency of the unit is improved. The high-pressure high-temperature carbon dioxide at the outlet of the compressor in the trans-critical carbon dioxide energy storage system is used for entering 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 increased, and meanwhile, the compression heat in the process of compressing the carbon dioxide is recovered to reduce the waste of heat. High-pressure and low-temperature carbon dioxide in the energy release stage of the trans-critical carbon dioxide energy storage system is heated by high-pressure and high-temperature extraction steam in a steam turbine cylinder, 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 regulation 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 electrically powered stop valve; 9-a carbon dioxide compressor; 10-a second electrically powered stop 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 cold accumulator; 17-a third electrically powered stop 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 extraction duct; 24-a second extraction duct.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, 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 expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled 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, condensed water 4, first heat exchange 5, a feed water pump 6, a regenerator 7, and a first generator 20.
Specifically, an outlet of the boiler 1 is communicated with an inlet of a steam turbine 2, an exhaust steam outlet of the steam turbine 2 is communicated with a hot side inlet of a condenser 3, and a power output shaft of the steam turbine 2 is connected with a first generator 20 to drive the first generator 20 to work. The exhaust steam is cooled in the condenser 3 to form condensed water, a condensed water outlet of the condenser 3 is communicated with an inlet of a condensed water pump 4, an outlet of the condensed water 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 a water feeding pump 6, an outlet of the water feeding pump 6 is communicated with a water side of a 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 cylinder of the steam turbine 2 is divided into two parts, 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 the feed water; the second steam extraction pipeline 24 is communicated with the hot side of the second heat exchanger 13, and the first electric stop valve 8 is arranged on the second steam extraction pipeline 24 and used for heating the high-pressure carbon dioxide in the energy release stage of the supercritical carbon dioxide energy storage system and then returning the high-pressure carbon dioxide into the heat regenerator 7. The two extracted steam flows into the heat regenerator 7, the extracted steam is cooled in the second heat exchanger 13, but still in a gas state, and is further cooled and condensed into water after entering the heat regenerator 7, and the water enters the boiler to be heated 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 cold accumulator 16, a liquid carbon dioxide storage tank 19, a second generator 21, and an electric motor 22.
An outlet of the carbon dioxide compressor 9 is communicated with a hot side inlet of the first heat exchanger 5, an inlet of the supercritical carbon dioxide storage tank 11 is communicated with a 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 a 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, and the power output shaft of the turbine 14 is connected with the second generator 21 to drive the second generator 21 to generate electricity. The outlet of the cooler 15 is connected with a first input pipeline of the cold accumulator 16, a first output pipeline of the cold accumulator 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; an 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 perform expansion work to drive a first power generator 20 to generate power, exhaust steam of the steam turbine 2 enters a condenser 3 to be condensed, then enters a cold side of a first heat exchanger 5 through a condensate pump 4 to exchange heat with high-pressure high-temperature carbon dioxide in a transcritical carbon dioxide energy storage system, the heated condensate water is pressurized by a water feeding pump 6 and then enters a heat regenerator 7 to come from a steam turbine, high-pressure high-temperature steam in a cylinder 2 is extracted to exchange heat, and then the condensate water returns to the boiler 1 to complete steam turbine steam power generation cycle.
An outlet pipeline of the condensate pump 4 is communicated with a cold side inlet of the first heat exchanger 5, and an outlet of a carbon dioxide compressor 9 in the transcritical carbon dioxide energy storage system is communicated with a hot side inlet of the first heat exchanger 5.
In the energy storage stage of the trans-critical carbon dioxide energy storage system, after the pressure of liquid carbon dioxide is reduced by the first electric throttle valve 18, the liquid carbon dioxide enters the cold accumulator 16 to absorb heat and gasify, meanwhile, cold energy is stored in the cold accumulator 16, the gasified carbon dioxide enters the carbon dioxide compressor 9 to be compressed, then enters the hot side of the first heat exchanger 5 to be cooled, and then passes through the second electric stop valve 10 to be stored in the supercritical carbon dioxide storage tank 11; in the energy release stage, the carbon dioxide discharged from the supercritical carbon dioxide storage tank 11 flows through the second electric throttle valve 12, enters the cold side of the second heat exchanger 13, is heated by high-pressure high-temperature extracted steam, enters the turbine 14 to expand and do work, drives the second generator 21 to generate power, and the energy-released supercritical carbon dioxide is cooled to room temperature through the cooler 15, then is cooled to a liquid state through the regenerator 16, and is stored in the carbon dioxide liquid storage tank 19.
The invention is based on the operation method of the transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system, which 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. Superheated steam from a boiler 1 enters a steam turbine 2 to do work through expansion, a first generator 20 is driven to generate power, part of steam is extracted from a cylinder of the steam turbine 2 and enters a heat regenerator 7 to be subjected to steam measurement and heating for water supply, steam discharged by the steam turbine 2 enters a condenser 3 to be condensed into condensed water, 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, and the condensed water does not exchange heat in the first heat exchanger 5; the feed water at the outlet of the heat regenerator 7 returns to the boiler 1 to complete the steam cycle power generation of the steam turbine. The state enables the trans-critical carbon dioxide energy storage system to be in a closed state, and only the normal operation of the steam turbine steam cycle power generation system is maintained.
When the power generation amount of the first generator 20 needs to be reduced, the second electric stop valve 10 and the first electric throttle valve 18 are opened, and the remaining valves are maintained in a closed state. Steam turbine steam cycle power generation system normal operating, outside the load that steam turbine steam cycle power generation system's electricity generation was gone out and is satisfied the electric wire netting requirement, unnecessary electric energy passes through motor 22 drive carbon dioxide compressor 9 and carries out work, liquid carbon dioxide is after first electronic choke valve 18 step-down, get into regenerator 16 heat absorption gasification, store cold energy in regenerator 16 simultaneously, carbon dioxide after the gasification gets into in carbon dioxide compressor 9 and is compressed to default pressure, high pressure high temperature carbon dioxide gets into 5 hot side heating condensate water of first heat exchanger, carbon dioxide after the cooling is stored in super critical carbon dioxide storage tank 11 through second electric stop valve 10, after the energy storage, close first electronic choke valve 18 earlier and then close second electric stop valve 10.
When the power generation amount of the first generator 20 needs to be increased, the first electric stop valve 8, the second electric throttle valve 12, and the third electric stop valve 17 are opened, and the remaining valves are maintained in a closed state. And (5) normally operating the steam turbine steam cycle power generation system. 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 a 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 regenerator 16, and is stored in the carbon dioxide liquid storage tank 19, and after the energy release is finished, the first electric stop valve 18, the second electric throttle valve 12 are closed first, and then the third electric stop valve 17 is closed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A power generation peak regulation system of a transcritical carbon dioxide energy storage coupling steam turbine 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);
an outlet of the carbon dioxide compressor (9) is connected with a hot side inlet of the first heat exchanger (5), a hot side outlet of the first heat exchanger (5) is connected to an inlet of the supercritical carbon dioxide storage tank (11), an outlet of the supercritical carbon dioxide storage tank (11) is connected to a cold side inlet of the second heat exchanger (13), a cold side outlet of the second heat exchanger (13) is connected to a turbine (14), and an outlet of the turbine (14) is connected to a cold accumulator (16); a first output pipeline of the cold accumulator (16) is connected to a liquid carbon dioxide storage tank (19), an outlet of the liquid carbon dioxide storage tank (19) is connected with a second input pipeline of the cold accumulator (16), and a second output pipeline of the cold accumulator (16) is connected with an 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 regulation system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein a condensed water pump (4) is arranged on a condensed water outlet of the condenser (3) and a cold side inlet connecting pipeline of the first heat exchanger (5).
3. The power generation peak-shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein a feed water pump (6) is arranged on a connecting pipeline between a cold side outlet of the first heat exchanger (5) and a water side inlet of the regenerator (7).
4. The power generation peak-shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein the second steam extraction pipeline (24) is provided with a first electric stop valve (8).
5. The power generation peak shaving system of the transcritical carbon dioxide energy storage coupled steam turbine according to claim 1, wherein an electric motor (22) is connected to the carbon dioxide compressor (9).
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 an outlet of the hot side of the first heat exchanger (5).
7. The power generation peak-shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to the claim 1, characterized in that an electric throttle valve (12) is arranged on a connecting pipeline of an outlet of the supercritical carbon dioxide storage tank (11) and a cold side inlet of the second heat exchanger (13).
8. The power generation peak-shaving system of the transcritical carbon dioxide energy storage coupling steam turbine according to claim 1, wherein a third electric stop valve (17) is arranged on the first output pipeline of the regenerator (16).
9. The power generation peak-shaving system of the transcritical carbon dioxide energy storage coupled steam turbine according to claim 1, wherein a first electric throttle valve (18) is arranged on the second input pipeline of the regenerator (16).
10. A method for operating the transcritical carbon dioxide energy storage coupled turbine power generation peak shaving system of claim 1,
when the steam turbine normally operates, steam is input into the steam turbine (2) by the boiler (1), the steam turbine (2) drives the first generator (20) to generate electricity, exhaust steam discharged by the steam turbine (2) is cooled into condensed water by the condensed water pump (4), and then the condensed 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) is heated in the heat regenerator (7) and then returns to the boiler (1);
when the power generation amount of the first generator (20) needs to be reduced, the steam turbine is normally operated, and redundant power output by the first generator (20) drives the carbon dioxide compressor (9) to work; 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 condensed water and then is stored in the supercritical carbon dioxide storage tank (11);
when the power generation amount of the first generator (20) needs to be increased, the steam turbine normally operates, 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 gaseous carbon dioxide after absorbing heat enters the turbine (14) to do work, and the turbine (14) drives the second generator (21) to generate power; the carbon dioxide after work is cooled to liquid state by a cold accumulator (16), and then stored in a carbon dioxide liquid storage tank (19).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114109549A (en) * | 2022-01-26 | 2022-03-01 | 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 |
| CN114622960A (en) * | 2022-03-09 | 2022-06-14 | 中国科学院理化技术研究所 | Transcritical carbon dioxide energy storage system |
| WO2023193486A1 (en) * | 2022-04-06 | 2023-10-12 | 西安热工研究院有限公司 | Normal-temperature liquid compressed carbon dioxide mixed working fluid energy storage system and method |
| CN114893267A (en) * | 2022-04-08 | 2022-08-12 | 东南大学 | Liquid carbon dioxide energy storage system for high back pressure-extraction condensation cogeneration system |
| CN114893267B (en) * | 2022-04-08 | 2024-04-09 | 东南大学 | Liquid carbon dioxide energy storage system for high back pressure-extraction condensation cogeneration system |
| CN114673571A (en) * | 2022-04-11 | 2022-06-28 | 中科南京未来能源系统研究院 | Coupling system for carbon capture, utilization, sealing and supercritical carbon dioxide energy storage technology |
| CN114592938B (en) * | 2022-04-11 | 2023-07-04 | 中国科学院工程热物理研究所 | Heat pump electricity storage coupling liquefied air energy storage integrated system and energy storage method |
| CN114673571B (en) * | 2022-04-11 | 2023-08-29 | 中科南京未来能源系统研究院 | Coupling system for carbon capture and utilization, sealing and supercritical carbon dioxide energy storage technology |
| CN114592938A (en) * | 2022-04-11 | 2022-06-07 | 中国科学院工程热物理研究所 | Heat pump electricity storage coupling liquefied air energy storage integrated system and energy storage method |
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| CN114776411A (en) * | 2022-05-27 | 2022-07-22 | 华能国际电力股份有限公司 | Heat-storage-integrated coal-fired power generation system and working method |
| CN115419484A (en) * | 2022-07-26 | 2022-12-02 | 合肥通用机械研究院有限公司 | Energy storage and carbon fixation system applied to test bed fuel gas cooling process |
| CN115419484B (en) * | 2022-07-26 | 2024-02-02 | 合肥通用机械研究院有限公司 | Energy storage and carbon fixation system applied to test bed gas cooling flow |
| CN115163229A (en) * | 2022-08-03 | 2022-10-11 | 哈尔滨工业大学 | Transcritical and supercritical coupled compressed CO 2 Energy storage system and method for operating same |
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