CN119554112A - A coupled power cycle system and method capable of storing and releasing energy - Google Patents
A coupled power cycle system and method capable of storing and releasing energy Download PDFInfo
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Abstract
The invention relates to the technical field of physical energy storage and thermal power generation, in particular to a coupling power circulation system and method capable of storing and releasing energy, wherein the circulation system comprises a CO 2 Brayton/Brayton-Rankine cycle subsystem, a CO 2 energy storage subsystem and a CO 2 absorption refrigeration system, CO 2 is transmitted between the CO 2 energy storage subsystem and the CO 2 Brayton/Brayton-Rankine cycle subsystem, the CO 2 Brayton/Brayton-Rankine cycle subsystem generates power through CO 2, and the LiBr absorption refrigeration system refrigerates CO 2 of the CO 2 energy storage subsystem according to waste heat of the CO 2 Brayton/Brayton-Rankine cycle subsystem. When the coupling power circulation system is used for storing energy, different systems can be used for running according to different seasons, seasonal renewable energy sources such as surplus electric energy or surplus solar energy of a power grid are stored in the CO 2 energy storage subsystem, and electric energy input into the power grid is reduced.
Description
Technical Field
The invention relates to the technical field of physical energy storage and thermal power generation, in particular to a coupling power circulation system and method capable of storing and releasing energy.
Background
With the rapid development of new energy power generation such as wind power and solar power generation, after the new energy power generation such as wind power and solar power generation is introduced into a power grid power supply system to supply power, the new energy power generation such as wind power and solar power generation depends on an external environment and has randomness and clearance, so that the balance of the power supply system is easily destroyed after the new energy power generation such as wind power and solar power generation is introduced into the power supply system. In addition, the power requirements of different periods and different seasons in the same day are also different, and the difficulty of keeping the power supply system in dynamic balance is further increased. Therefore, after new energy sources such as wind power, solar power generation and the like are introduced to generate power, the power generation peak and the power consumption peak of the power supply system are difficult to align, the power supply system is difficult to maintain dynamic balance, and the purpose of stable power supply is difficult to achieve.
Disclosure of Invention
The invention aims to overcome the defect that the dynamic balance of a power supply system is difficult to maintain after new energy sources such as wind power, solar power generation and the like are introduced into the prior art to generate power, and provides a coupling power circulation system and a coupling power circulation method capable of storing and releasing energy.
In order to solve the technical problems, the invention adopts the following technical scheme:
The coupling power circulation system capable of storing and releasing energy comprises a CO 2 Brayton/Brayton-Rankine circulation subsystem, a CO 2 energy storage subsystem and a LiBr absorption refrigeration system, wherein the CO 2 energy storage subsystem is used for inputting working media into the CO 2 Brayton/Brayton-Rankine circulation subsystem or receiving working media from the CO 2 Brayton/Brayton-Rankine circulation subsystem, the CO 2 Brayton/Brayton-Rankine circulation subsystem is connected with the CO 2 energy storage subsystem and the LiBr absorption refrigeration system to generate electricity according to the working media provided by the CO 2 energy storage subsystem, and the LiBr absorption refrigeration system is used for refrigerating the working media of the CO 2 energy storage subsystem according to waste heat of the CO 2 Brayton/Brayton-Rankine circulation subsystem.
When the environment temperature is higher and the power grid load is smaller, the CO 2 Brayton/Brayton-Rankine cycle subsystem is coupled with the LiBr absorption refrigeration system, the LiBr absorption refrigeration system utilizes the waste heat of the CO 2 Brayton/Brayton-Rankine cycle subsystem to cool CO 2 and store the waste heat in the CO 2 energy storage subsystem to finish energy storage, when the environment temperature is lower and the power grid load is smaller, the CO 2 can be cooled and stored in the CO 2 energy storage subsystem through an external low-temperature environment, and the LiBr absorption refrigeration system and the CO 2 energy storage subsystem can be coupled, and the LiBr absorption refrigeration system can be used for cooling CO 2 and storing the waste heat in the CO 2 energy storage subsystem. When the power grid load is large, the waste heat of the CO 2 Brayton/Brayton-Rankine cycle subsystem is used for evaporating CO 2 in the CO 2 energy storage subsystem, and the CO 2 entering the CO 2 Brayton/Brayton-Rankine cycle subsystem performs power generation and releases energy.
When the coupling power circulation system is used for storing energy, different systems can be used for running according to different seasons, seasonal renewable energy sources such as surplus electric energy or surplus solar energy of a power grid are stored in the CO 2 energy storage subsystem, electric energy input into the power grid is reduced, and when the energy is released, the energy storage system is connected into a power generation cycle to release the energy, the power generation cycle output work is increased, and the electric energy input into the power grid is increased. The energy storage system can fully utilize the existing equipment of the power plant, reduce the cost, and the power generation system can adapt to various heat source scenes and realize flexible peak shaving. Proved by inspection, the round trip efficiency of the compressed CO 2 exceeds 100% and can reach 150%, which means that the extra electric energy generated by the energy release mode exceeds the electric energy consumed by the energy storage mode, and the round trip efficiency of a general compressed gas energy storage system is about 50% -70%, which is obviously improved compared with the prior art.
Preferably, the CO 2 energy storage subsystem comprises a main compressor, a turbine and a low-pressure CO 2 storage tank, a first pump, a first cooler, a second pump, a second cooler and a high-pressure CO 2 storage tank which are sequentially connected, wherein the low-pressure CO 2 storage tank is connected with the main compressor and the turbine through the CO 2 Brayton/Brayton-Rankine cycle subsystem. After being cooled by the low-temperature environment, the low-pressure liquid CO 2 is pressurized and cooled by a two-stage pump and two intercoolers and stored in a high-pressure CO 2 storage tank.
Preferably, the LiBr absorption refrigeration system comprises a generator, a condenser, an evaporator and an absorber which are sequentially connected, wherein a heat regenerator, a pump III and a first throttle valve are arranged between the generator and the absorber, working medium in the absorber sequentially passes through the pump III and the heat regenerator to enter the generator, working medium in the generator sequentially passes through the heat regenerator and the first throttle valve to enter the absorber, and a second throttle valve is arranged between the condenser and the evaporator. Firstly, a circulating flow with the waste heat of the power cycle evaporates LiBr solution through a generator, the flow is divided into two sections, namely, the first section of LiBr concentrated solution is expanded and cooled through a first throttle valve after heat release, and then enters an absorber. Mixing with saturated water flowing out of the evaporator to become LiBr dilute solution again, pressurizing in a pump III, heating in a regenerator, and then entering the generator to complete solution circulation, wherein the second section of superheated steam flows into a condenser to be cooled to become low-temperature superheated steam or saturated steam, then flows into a second throttle valve to be expanded and cooled to about 6 ℃. The CO 2 flows or stores cold energy after entering the evaporator Eva, absorbs heat and enters the absorber.
Preferably, the CO 2 Brayton/Brayton-Rankine cycle subsystem comprises a Brayton-Rankine hybrid power cycle system, the Brayton-Rankine hybrid power cycle system comprises a heat source heater, a high-temperature heat regenerator, a medium-temperature heat regenerator, a low-temperature heat regenerator, a recompressor, a cooler and a pump IV, working media in the turbine sequentially pass through the high-temperature heat regenerator, the medium-temperature heat regenerator and the low-temperature heat regenerator to enter the cooler IV, working media in the cooler sequentially pass through the pump IV, the low-temperature heat regenerator, the medium-temperature heat regenerator, the high-temperature heat regenerator and the heat source heater to enter the turbine IV, working media flowing out of the medium-temperature heat regenerator also flow into the high-temperature heat regenerator through the recompression, and working media flowing out of the low-temperature heat regenerator also flow into the medium-temperature heat regenerator through the main compressor.
Preferably, the CO 2 Brayton/Brayton-Rankine cycle subsystem comprises a recompression Brayton power cycle system, the recompression Brayton power cycle system comprises a heat source heater, a high-temperature regenerator, a low-temperature regenerator, a recompression machine and a cooler, working media in a turbine sequentially pass through the high-temperature regenerator and the low-temperature regenerator to enter the cooler, working media in the cooler sequentially pass through the main compressor, the low-temperature regenerator, the high-temperature regenerator and the heat source heater to enter the turbine, and working media flowing out of the low-temperature regenerator also pass through the recompression machine to flow into the high-temperature regenerator.
The energy storage cycle comprises a high-temperature energy storage cycle and a low-temperature energy storage cycle, wherein before the coupling power cycle is carried out, the work load of a power grid is firstly judged, if the work load of the power grid is large, the energy storage cycle is started, if the work load of the power grid is small, the work environment of the power grid is continuously judged, if the work environment of the power grid is in a low-temperature environment, the low-temperature energy storage cycle is started, and if the work environment of the power grid is in a high-temperature environment, the high-temperature energy storage cycle is started.
The coupling power circulation method capable of storing and releasing energy has various operation modes in the energy storage stage, can fully utilize the cold source in the low-temperature environment, can increase the energy storage power under the condition of sufficient cold energy, is only strongly coupled with the pump or the main compressor of the power circulation, and has strong flexibility and almost no influence on other equipment of the power circulation.
Preferably, the coupling power circulation system under the energy release circulation is the coupling power circulation system, and comprises the following working steps that firstly, high-pressure liquid CO 2 flows out of a high-pressure CO 2 storage tank, the pressure and the temperature of the high-pressure liquid CO 2 are 25MPa and 25 ℃, and the high-pressure liquid CO flows into a heat regenerator to evaporate until the temperature of CO 2 flowing out of the heat regenerator is the same as the temperature of CO 2 at an outlet of a main compressor. The temperature of CO 2 flowing out of the heat regenerator and CO 2 at the outlet of the main compressor are mixed and then flow to a low-pressure CO 2 storage tank through a flow divider, the mixture is condensed to 25 ℃ through a cold accumulator and then stored in the low-pressure CO 2 storage tank, and the storage pressure of the low-pressure CO 2 storage tank is 8.5MPa and is the same as the pressure of CO 2 at the inlet of the main compressor.
Preferably, the coupling power circulation system under the high-temperature energy storage circulation is the coupling power circulation system, and comprises the following working steps that low-temperature low-pressure CO 2 flowing out of a low-pressure CO 2 storage tank is absorbed by a heat regenerator to waste heat of high-temperature high-pressure CO 2 entering the high-temperature heat regenerator, and is mixed with a main circulating flow to enter a main compressor inlet after being heated to a preset temperature, and the main compressor consumes additional electric energy or compresses CO 2 in a power mode. The CO 2 flowing out of the main compressor is split, one strand of liquid CO 2 which is condensed into 25MPa and 25 ℃ by an evaporator and stored in a high-pressure CO 2 storage tank, the other strand of liquid CO 2 continuously flows into the medium-temperature heat regenerator as a circulating main flow, the outlet of the medium-temperature heat regenerator is mixed with the flow CO 2 from the recompressor, the mixed CO 2 sequentially flows through the high-temperature heat regenerator, the heat source heater and the turbine, and electric energy is output by acting on the turbine and can be input into a power grid or supplied to the main compressor for energy storage. After the CO 2 at the turbine outlet flows through the high-temperature heat regenerator and the medium-temperature heat regenerator to release waste heat, the waste heat flows into the cooler to exchange heat with the environment to raise the temperature to 35 ℃ so as to complete one cycle.
Preferably, the coupling power circulation system under the low-temperature energy storage circulation is the coupling power circulation system, and comprises the following working steps that low-pressure liquid CO 2 flowing out of a low-pressure CO 2 storage tank is cooled by a low-temperature environment and then is pressurized and cooled by a two-stage pump and two coolers to be stored in a high-pressure CO 2 storage tank. The pump may be driven by a turbine T.
Preferably, the coupling power circulation system under the low-temperature energy storage circulation is the coupling power circulation system and comprises the following working steps that liquid CO 2 at the outlet of a low-pressure CO 2 storage tank flows into a cooler, is cooled by a low-temperature environment, flows into a mixer, is mixed with a main circulation flow, flows into a pump, is pressurized, and flows into a pressurized CO 2, and is split by a splitter, wherein one strand flows into a high-temperature heat regenerator after passing through the heat regenerator, and the other strand flows into a low-temperature heat regenerator in the main circulation. CO 2 flowing into the low-temperature heat regenerator is evaporated into supercritical CO 2 through the low-temperature heat regenerator and is mixed with CO 2 at the outlet of the main compressor in the mixer, the mixed CO 2 flows into the medium-temperature heat regenerator to absorb heat, CO 2 flowing out of the medium-temperature heat regenerator and CO 2 at the outlet of the recompressor are mixed and then sequentially flow into the high-temperature heat regenerator and the heat source heater to absorb heat, the absorbed CO 2 enters the turbine to expand to apply work, the CO 2 flowing out of the turbine flows through the high-temperature heat regenerator and the medium-temperature heat regenerator to release waste heat, CO 2 at the outlet of the medium-temperature heat regenerator is split in the splitter, one strand flows into the recompressor, the other strand flows into the low-temperature heat regenerator, one strand of CO 2 flowing out of the low-temperature heat regenerator enters the main compressor to be compressed, and the other strand is coupled with the energy storage system after being cooled into a liquid state by the environment, and one cycle is completed.
Compared with the prior art, the invention has the beneficial effects that:
the coupling power circulation system capable of storing and releasing energy can be operated by adopting different systems according to different seasons when storing energy, and can store surplus electric energy of a power grid or surplus solar energy and other seasonal renewable energy sources in the CO 2 energy storage subsystem to reduce the electric energy input into the power grid. The energy storage system can fully utilize the existing equipment of the power plant, reduce the cost, and the power generation system can adapt to various heat source scenes and realize flexible peak shaving.
The CO 2 Brayton/Brayton-Rankine cycle subsystem in the coupling power cycle system capable of storing and releasing energy comprises a Brayton-Rankine hybrid power cycle system and a recompression Brayton power cycle system, and after the CO 2 energy storage subsystem is coupled, the heat source utilization rate of the energy storage system is greatly improved compared with that of a conventional energy storage system, and the round trip efficiency of the energy storage system can be improved.
The coupling power circulation method capable of storing and releasing energy has various operation modes in the energy storage stage, can fully utilize the cold source in the low-temperature environment, can increase the energy storage power under the condition of sufficient cold energy, is only strongly coupled with the pump or the main compressor of the power circulation, and has strong flexibility and almost no influence on other equipment of the power circulation.
Drawings
FIG. 1 is a schematic diagram of a LiBr absorption refrigeration system of a coupling power cycle system capable of storing and releasing energy, wherein arrows in the diagram indicate the flow direction of CO 2;
FIG. 2 is a high Wen Shi energy cycle flow chart of a storable energy-releasing coupled power cycle method, where the arrows indicate the CO 2 flow direction;
FIG. 3 is a flow chart of a low temperature energy storage cycle of a method of energy storage and release coupled power cycle, wherein the arrows indicate the CO 2 flow direction;
FIG. 4 is a flow chart of another low temperature energy storage cycle of a method of energy storage and release coupled power cycle, wherein the arrows indicate the CO 2 flow direction;
FIG. 5 is a flow chart of a high temperature energy storage cycle of a method of energy storage and release coupled power cycle, where the arrows indicate the flow of CO 2.
In the drawing, 1, a low-pressure CO 2 storage tank, 2, a high-pressure CO 2 storage tank, 3, a first cooler, 4, a second cooler, 5, a first pump, 6, a second pump, 7, a generator, 8, a condenser, 9, an evaporator, 10, an absorber, 11, a regenerator, 12, a third pump, 13, a first throttle valve, 14, a heat source heater, 5, a turbine, 16, a high-temperature regenerator, 17, a medium-temperature regenerator, 18, a low-temperature regenerator, 19, a main compressor, 20, a recompression machine, 21, a cooler, 22 and a fourth pump are arranged.
Detailed Description
The invention is further described below in connection with the following detailed description. In which the drawings are for illustrative purposes only and are not intended to be construed as limiting the present patent, and in which certain elements of the drawings may be omitted, enlarged or reduced in order to better illustrate embodiments of the present invention, and not to represent actual product dimensions, it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that the specific meanings of the terms described above should be understood by those skilled in the art according to circumstances.
Example 1
The embodiment is a first embodiment of a coupling power cycle system capable of storing and releasing energy, comprising a CO 2 Brayton/Brayton-Rankine cycle subsystem, a CO 2 energy storage subsystem and a Br absorption refrigeration system, wherein the CO 2 energy storage subsystem is used for inputting working media into the CO 2 Brayton/Brayton-Rankine cycle subsystem or receiving working media from the CO 2 Brayton/Brayton-Rankine cycle subsystem, the CO 2 Brayton/Brayton-Rankine cycle subsystem is connected with the CO 2 energy storage subsystem and the LiBr absorption refrigeration system to generate power according to the working media provided by the CO 2 energy storage subsystem, and the LiBr absorption refrigeration system is used for refrigerating the working media of the CO 2 energy storage subsystem according to the waste heat of the CO 2 Brayton/Brayton-Rankine cycle subsystem.
Specifically, the CO 2 energy storage subsystem comprises a main compressor 19, a turbine 15, and a low-pressure CO 2 storage tank 1, a first pump 5, a first cooler 3, a second pump 6, a second cooler 4 and a high-pressure CO 2 storage tank 2 which are sequentially connected, wherein the low-pressure CO 2 storage tank 1 is connected with the main compressor 19 and the turbine 15 through a CO 2 Brayton/Brayton-Rankine cycle subsystem. After the low-pressure liquid CO 2 is cooled by the low-temperature environment, the low-pressure liquid CO 2 is pressurized and cooled by a two-stage pump and two intercoolers 21 and stored in a high-pressure CO 2 storage tank 2.
Specifically, as shown in fig. 1, the LiBr absorption refrigeration system comprises a generator 7, a condenser 8, an evaporator 9 and an absorber 10 which are sequentially connected, wherein a heat regenerator 11, a pump III 12 and a first throttle valve 13 are arranged between the generator 7 and the absorber 10, working media in the absorber 10 sequentially enter the generator 7 through the pump III 12 and the heat regenerator 11, working media in the generator 7 sequentially enter the absorber 10 through the heat regenerator 11 and the first throttle valve 13, and a second throttle valve is arranged between the condenser 8 and the evaporator 9.
Specifically, the CO 2 Brayton/Brayton-Rankine cycle subsystem comprises a recompression Brayton power cycle system, the recompression Brayton power cycle system comprises a heat source heater 14, a high-temperature heat regenerator 16, a low-temperature heat regenerator 18, a recompression 20 and a cooler 21, working media in the turbine 15 sequentially pass through the high-temperature heat regenerator 16 and the low-temperature heat regenerator 18 to enter the cooler 21, working media in the cooler 21 sequentially pass through a main compressor 19, the low-temperature heat regenerator 18, the high-temperature heat regenerator 16 and the heat source heater 14 to enter the turbine 15, and working media flowing out of the low-temperature heat regenerator 18 also pass through the recompression 20 to flow into the high-temperature heat regenerator 16.
The working principle of this embodiment is as follows:
When the environment temperature is low and the power grid load is low, CO 2 can be cooled and stored in the CO 2 energy storage subsystem through an external low-temperature environment, and also can be coupled with the CO 2 energy storage subsystem through the LiBr absorption refrigeration system, and CO 2 can be cooled and stored in the CO 2 energy storage subsystem through the LiBr absorption refrigeration system. When the power grid load is large, the waste heat of the CO 2 Brayton/Brayton-Rankine cycle subsystem is used for evaporating CO 2 in the CO 2 energy storage subsystem, and the CO 2 entering the CO 2 Brayton/Brayton-Rankine cycle subsystem performs power generation and releases energy.
The beneficial effects of this embodiment are as follows:
When the coupling power circulation system is used for storing energy, different systems can be used for running according to different seasons, seasonal renewable energy sources such as surplus electric energy or surplus solar energy of a power grid are stored in the CO 2 energy storage subsystem, electric energy input into the power grid is reduced, and when the energy is released, the energy storage system is connected into a power generation cycle to release the energy, the power generation cycle output work is increased, and the electric energy input into the power grid is increased. The energy storage system can fully utilize the existing equipment of the power plant, reduce the cost, and the power generation system can adapt to various heat source scenes and realize flexible peak shaving.
Example two
This embodiment is a second embodiment of a coupled power cycle system that can store and release energy, similar to the embodiments, except that the CO 2 brayton/brayton-rankine cycle subsystem is structurally different.
Specifically, the sCO 2-CO2 Brayton-hybrid cycle system comprises a Brayton-Rankine hybrid cycle system, the Brayton-Rankine hybrid cycle system comprises a heat source heater 14, a high-temperature heat regenerator 16, a medium-temperature heat regenerator 17, a low-temperature heat regenerator 18, a recompressor 20, a cooler 21 and a pump IV 22, working media in the turbine 15 sequentially pass through the high-temperature heat regenerator 16, the medium-temperature heat regenerator 17 and the low-temperature heat regenerator 18 to enter the cooler 21, working media in the cooler 21 sequentially pass through the pump IV 22, the low-temperature heat regenerator 18, the medium-temperature heat regenerator 17, the high-temperature heat regenerator 16 and the heat source heater 14 to enter the turbine 15, working media flowing out of the medium-temperature heat regenerator 17 also flow into the high-temperature heat regenerator 16 through the recompression 20, and working media flowing out of the low-temperature heat regenerator 18 also flow into the medium-temperature heat regenerator 17 through the main compressor 19.
Other features and advantageous effects of the present embodiment are the same as those of the first embodiment.
Example III
The present embodiment is an embodiment of a coupling power circulation method capable of storing and releasing energy, and the present embodiment further defines the power circulation method of the coupling system on the basis of the first embodiment and the second embodiment.
The energy storage cycle comprises a high-temperature energy storage cycle and a low-temperature energy storage cycle, and before the coupling power cycle is carried out, the work load of a power grid is firstly judged, if the work load of the power grid is large, the energy storage cycle is started, if the work load of the power grid is small, the work environment of the power grid is continuously judged, if the work environment is in a low-temperature environment, the low-temperature energy storage cycle is started, and if the work environment is in a high-temperature environment, the high-temperature energy storage cycle is started.
Specifically, the coupled power cycle system under energy release cycle is the coupled power cycle system as shown in the embodiment 1, and as shown in fig. 2, the method comprises the following working steps that firstly, high-pressure liquid CO 2 flows out of a high-pressure CO 2 storage tank 2, the pressure and the temperature of the high-pressure liquid CO 2 are 25MPa and 25 ℃, the pressure and the temperature of the high-pressure liquid CO are 25 ℃ respectively, and the high-pressure liquid CO flows into a heat regenerator 11 to be evaporated until the temperature of CO 2 flowing out of the heat regenerator 11 is the same as the temperature of CO 2 at an outlet of a main compressor 19. The temperature of the CO 2 flowing out of the heat regenerator 11 and the CO 2 at the outlet of the main compressor 19 are mixed and then flow to the low-pressure CO 2 storage tank 1 through a flow divider, the mixture is condensed to 25 ℃ through a cold accumulator and then stored in the low-pressure CO 2 storage tank 1, and the storage pressure of the low-pressure CO 2 storage tank 1 is 8.5MPa and is the same as the pressure of the CO 2 at the inlet of the main compressor 19.
Specifically, the coupling power circulation system under the high-temperature energy storage circulation is the coupling power circulation system as shown in the first embodiment, and as shown in fig. 3, the coupling power circulation system comprises the following working steps that low-temperature low-pressure CO 2 flowing out of the low-pressure CO 2 storage tank 1 is absorbed by the heat regenerator 11 to waste heat of high-temperature high-pressure CO 2 entering the high-temperature heat regenerator 16, and after the temperature is raised to a preset temperature, the waste heat is mixed with a main circulation flow to enter an inlet of the main compressor 19, and the main compressor 19 consumes additional electric energy or compresses CO 2. The CO 2 flowing out of the main compressor 19 is split, one strand is condensed into 25MPa and 25 ℃ liquid CO 2 through the evaporator 9 and stored in the high-pressure CO 2 storage tank 2, the other strand continuously flows into the medium-temperature heat regenerator 17 as a circulating main flow, the outlet of the medium-temperature heat regenerator 17 is mixed with the flow CO 2 from the recompressor 20, the mixed CO 2 sequentially flows through the high-temperature heat regenerator 16, the heat source heater 14 and the turbine 15, and electric energy is output by acting on the turbine 15 and can be input into a power grid or supplied to the main compressor 19 for energy storage. After the CO 2 at the outlet of the turbine 15 flows through the high-temperature heat regenerator 16 and the medium-temperature heat regenerator 17 to release waste heat, the waste heat flows into the cooler 21 to exchange heat with the environment to raise the temperature to 35 ℃ so as to complete one cycle.
Specifically, the coupled power circulation system under the low-temperature energy storage circulation is the coupled power circulation system as shown in the first embodiment, and comprises the following working steps of cooling low-pressure liquid CO 2 flowing out of a low-pressure CO 2 storage tank 1 by a low-temperature environment, and then pressurizing and cooling the low-pressure liquid CO 2 by a two-stage pump and two coolers 21 to store the low-pressure liquid CO 2 in a high-pressure CO 2 storage tank 2. The pump may be driven by a turbine 15.
Specifically, the coupled power circulation system under the low-temperature energy storage circulation is a coupled power circulation system as shown in fig. 5, and comprises the following working steps that liquid CO 2 at the outlet of the low-pressure CO 2 storage tank 1 flows into the cooler 21, is cooled by a low-temperature environment, flows into the mixer to be mixed with a main circulation flow, flows into a pump to be pressurized, and flows into the pressurized CO 2, wherein one flow of the pressurized CO 2 is split by the splitter, flows into the high-temperature regenerator 16 after passing through the regenerator 11, and the other flow of the pressurized CO flows into the low-temperature regenerator 18 in the main circulation. CO 2 flowing into the low-temperature heat regenerator 18 is evaporated into supercritical CO 2 through the low-temperature heat regenerator 18 and is mixed with CO 2 at the outlet of the main compressor 19 in a mixer, the mixed CO 2 flows into the middle-temperature heat regenerator 17 to absorb heat, CO 2 flowing out of the middle-temperature heat regenerator 17 and CO 2 at the outlet of the recompressor 20 are mixed and then sequentially flow into the high-temperature heat regenerator 16 and the heat source heater 14 to absorb heat, the absorbed CO 2 enters the turbine 15 to expand and do work, the CO 2 flowing out of the turbine 15 flows through the high-temperature heat regenerator 16 and the middle-temperature heat regenerator 17 to release waste heat, the CO 2 at the outlet of the middle-temperature heat regenerator 17 is split in a splitter, one strand flows into the recompressor 20, the other strand flows into the low-temperature heat regenerator 18, one strand of CO 2 flowing out of the low-temperature heat regenerator 18 enters the main compressor 19 to be compressed, and the other strand is cooled into a liquid state by the environment and then is coupled with an energy storage system to complete a cycle.
The coupling power circulation method capable of storing and releasing energy has the advantages that in the energy storage stage, multiple operation modes exist, a low-temperature environment cold source can be fully utilized, energy storage power can be increased under the condition of sufficient cold energy, the coupling power circulation method is only strongly coupled with a pump or a main compressor 19 of the power circulation, flexibility is strong, and the coupling power circulation method has little influence on other equipment of the power circulation.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
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