Pressure storage power station heat storage system of public heat storage medium circulating pump

Abstract

The utility model discloses a pressure storage power station heat storage system of a public heat storage medium circulating pump, and relates to the technical field of non-afterburning type compressed air energy storage power station heat storage systems. The device comprises a high-temperature storage tank, a low-temperature storage tank and a public circulating pump, the high-temperature storage tank is connected with the circulating pump inlet mother pipe, the low-temperature storage tank is connected with the circulating pump inlet mother pipe, and the circulating pump inlet mother pipe is connected with the public circulating pump; the public circulating pump is connected with the circulating pump outlet main pipe, and the circulating pump outlet main pipe is connected with the high-temperature storage tank through the high-temperature main pipe and connected with the low-temperature storage tank through the low-temperature main pipe. According to the utility model, the public circulating pump is adopted, so that the configuration number of heat storage medium circulating pumps in the heat storage system can be obviously reduced, the system configuration is optimized, and the occupied area of a pump room is reduced, thereby effectively reducing the construction cost of a power station.

Description

Technical Field

[0001] This utility model relates to the technical field of non-combustion-type compressed air energy storage power station thermal storage system, and more specifically, it is a compressed air energy storage power station thermal storage system with a common thermal storage medium circulation pump. Background Technology

[0002] Compressed air energy storage has gradually begun to be demonstrated and applied in engineering projects in China due to its excellent performance in terms of technological maturity, design life, design scale, and energy storage duration. Non-combustion type compressed air energy storage system, also known as advanced compressed air energy storage system, stores the heat generated by the compressor's compressed air in the heat storage device through water, heat transfer oil, molten salt or other heat storage media. Then, during the energy release stage, the stored heat is transferred to the turbine inlet air through a heat exchanger, thereby improving the turbine's output power.

[0003] Non-combustion-based compressed air energy storage systems typically employ multi-stage compression and expansion. Compared to traditional combustion-based compressed air energy storage systems, advanced adiabatic compressed air energy storage systems require no fuel consumption and have no combustion stage. They offer advantages such as environmental friendliness and zero pollution, better aligning with current green, environmentally friendly, and low-carbon development requirements. Consequently, they have gained significant attention and rapid development in China. Non-combustion-based compressed air energy storage power stations using water, heat transfer oil, or molten salt as the heat storage medium generally store the high-temperature heat storage medium after heat absorption in a high-temperature tank, while the low-temperature heat storage medium after heat release is stored in a low-temperature tank. This system utilizes a heat exchanger to extract and store the heat of compression, using it to replace fuel for heating the turbine intake air instead of dissipating it through a cooler, which can significantly improve system efficiency.

[0004] Currently, the thermal storage system of non-combustion compressed air energy storage power stations generally adopts the following scheme: During the energy storage phase, the low-temperature thermal storage medium in the low-temperature tank is pressurized by the low-temperature circulating pump and flows through the compressor-side heat exchanger to absorb heat from the compressor outlet air. The high-temperature thermal storage medium, after being heated, flows into the high-temperature tank. During the energy release phase, the high-temperature thermal storage medium in the high-temperature tank is pressurized by the high-temperature circulating pump and flows through the expansion-side heat exchanger to heat the turbine inlet air. The low-temperature thermal storage medium, after being cooled, flows into the low-temperature tank. At the same time, in order to ensure that the outlet flow rate of the circulating pump is above the minimum allowable flow rate during startup and low-load phases, the high-temperature circulating pump and the low-temperature circulating pump are each equipped with a minimum flow recirculation bypass pipeline.

[0005] The conventional non-combustion compressed air energy storage power station thermal storage system scheme mentioned above requires the separate configuration of high-temperature circulating pumps, low-temperature circulating pumps, and their corresponding minimum flow recirculation bypasses. Considering that the circulating pumps are key equipment to ensure the stable operation of the power station, a certain degree of redundancy needs to be considered. Depending on the unit capacity, the conventional configuration scheme can select 3 circulating pumps at 50% capacity or 2 at 100% capacity. Therefore, when adopting the conventional thermal storage system scheme, the number of high-temperature and low-temperature circulating pumps is large, the system is complex, resulting in a large footprint, high cost, and complex operation of the thermal storage system pump room.

[0006] Therefore, it is necessary to develop a compressed air energy storage power station thermal storage system that can effectively reduce the number of thermal storage medium circulation pumps, reduce investment in circulation pumps and their auxiliary facilities, simplify system operation, optimize pipeline system, and have good economic benefits, while ensuring the stable operation of the compressed air energy storage power station. Utility Model Content

[0007] The purpose of this invention is to solve the problems of equipment redundancy, low system integration, large investment, large pump room footprint, and complex operation caused by the independent setting of high and low temperature circulating pumps in existing compressed air energy storage power station thermal storage systems. Instead, it provides a compressed air energy storage power station thermal storage system that optimizes the configuration of circulating pumps in the compressed air energy storage power station thermal storage system, improves the utilization rate of circulating pumps, reduces power station investment, simplifies operation, and optimizes the pipeline system by providing a common thermal storage medium circulating pump.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: a pressure storage power station thermal storage system with a common thermal storage medium circulation pump, characterized in that it includes a high-temperature storage tank, a low-temperature storage tank, and a common circulation pump;

[0009] The high-temperature storage tank is connected to the circulation pump inlet header via the high-temperature side circulation pump inlet header, the low-temperature storage tank is connected to the circulation pump inlet header via the low-temperature side circulation pump inlet header, and the circulation pump inlet header is connected to the common circulation pump.

[0010] The common circulation pump is connected to the circulation pump outlet header, and the circulation pump outlet header is connected to the high-temperature storage tank through the high-temperature header and to the low-temperature storage tank through the low-temperature header.

[0011] The high-temperature header is connected to a compression-side heat exchanger, and the low-temperature header is connected to an expansion-side heat exchanger.

[0012] In the above technical solution, the high-temperature storage tank is connected to the inlet header of the high-temperature side circulation pump through the inlet and outlet shut-off valves of the high-temperature storage tank, and the inlet header of the high-temperature side circulation pump is equipped with a shut-off valve for the inlet header of the high-temperature side circulation pump.

[0013] The cryogenic storage tank is connected to the inlet header of the cryogenic side circulation pump via a cryogenic storage tank inlet / outlet shut-off valve, and a cryogenic side circulation pump inlet header shut-off valve is provided on the cryogenic side circulation pump inlet header.

[0014] A circulation pump inlet shut-off valve is installed on the circulation pump inlet header, and a circulation pump outlet shut-off valve is installed on the circulation pump outlet header.

[0015] A high-temperature main pipe inlet shut-off valve is provided at the inlet of the high-temperature main pipe, and a high-temperature main pipe outlet shut-off valve is provided at the outlet of the high-temperature main pipe. A low-temperature main pipe inlet shut-off valve is provided at the inlet of the low-temperature main pipe, and a low-temperature main pipe outlet shut-off valve is provided at the outlet of the low-temperature main pipe.

[0016] The above technical solution also includes a minimum flow recirculation pipeline for the circulating pump; the inlet of the minimum flow recirculation pipeline is connected to the outlet main pipe of the circulating pump, and the outlet is connected to the inlet main pipe of the circulating pump. The minimum flow recirculation pipeline for the circulating pump is provided with an inlet shut-off valve, a regulating valve, and an outlet shut-off valve in sequence from the inlet to the outlet.

[0017] The above technical solution also includes a compression-side start-up recirculation pipeline; the inlet of the compression-side start-up recirculation pipeline is connected to the high-temperature main pipe, the connection is located between the high-temperature main pipe outlet shut-off valve and the compression-side heat exchanger, and the outlet of the compression-side start-up recirculation pipeline is connected to the cryogenic storage tank.

[0018] In the above technical solution, a compression-side start-up recirculation pipeline inlet shut-off valve is provided at the inlet of the compression-side start-up recirculation pipeline, and a compression-side start-up recirculation pipeline outlet shut-off valve is provided at the outlet.

[0019] The above technical solution also includes an expansion-side start-up recirculation pipeline; the inlet of the expansion-side start-up recirculation pipeline is connected to the cryogenic main pipe, the connection is located between the cryogenic main pipe outlet shut-off valve and the expansion-side heat exchanger, and the outlet of the expansion-side start-up recirculation pipeline is connected to the circulating pump inlet main pipe.

[0020] In the above technical solution, an expansion-side start-up recirculation pipeline shut-off valve is provided on the expansion-side start-up recirculation pipeline.

[0021] In the above technical solution, both the high-temperature main pipe and the low-temperature main pipe are equipped with check valves and regulating valves.

[0022] In the above technical solution, when the duration of the compression energy storage stage and the duration of the expansion power generation stage are equal, the common circulation pump is configured with 2×100% capacity or 3×50% capacity. In both the compression energy storage stage and the expansion power generation stage, the common circulation pump operates in a 1-operation-1-standby or 2-operation-1-standby mode.

[0023] When the ratio of the duration of the compression energy storage phase to the duration of the expansion power generation phase is 2:1, the common circulation pump adopts a 3×50% capacity configuration. During the compression energy storage phase, the common circulation pump operates in a 1-operation 2-standby mode, and during the expansion power generation phase, the common circulation pump operates in a 2-operation 1-standby mode.

[0024] When the ratio of the duration of the compression energy storage phase to the duration of the expansion power generation phase is 3:2, the common circulation pump adopts a 4×33% capacity configuration. During the compression energy storage phase, the common circulation pump operates in a 2-operation, 2-standby mode, and during the expansion power generation phase, the common circulation pump operates in a 3-operation, 1-standby mode.

[0025] Compared with the prior art, this utility model has the following advantages:

[0026] 1) This utility model adopts a common circulation pump, which can significantly reduce the number of circulation pumps for the thermal storage medium in the thermal storage system, optimize the system configuration, reduce the pump room footprint, and thus effectively reduce the construction cost of the power plant.

[0027] 2) This utility model adopts a common circulating pump, which can significantly improve the system integration and the utilization rate of the circulating pump. At the same time, through the pump configuration scheme, it ensures that the circulating pump always works near the optimal efficiency point during the compression energy storage stage and the expansion power generation stage, thereby reducing plant power consumption and improving the economic efficiency of the power station.

[0028] 3) This utility model effectively reduces the time required for startup and shutdown. To mitigate losses, a compression-side start-up recirculation pipeline and an expansion-side start-up recirculation pipeline were installed.

[0029] 4) This utility model uses a common circulating pump, requiring only a minimum flow recirculation bypass pipeline, reducing investment in circulating pump auxiliary facilities, simplifying system operation, optimizing the pipeline system, and resulting in good economic benefits. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Among them, 100-high temperature storage tank, 110-high temperature storage tank inlet and outlet shut-off valve, 200-low temperature storage tank, 210-low temperature storage tank inlet and outlet shut-off valve, 300-common circulation pump, 410-circulation pump inlet header, 411-circulation pump inlet shut-off valve, 420-high temperature side circulation pump inlet header, 421-high temperature side circulation pump inlet header shut-off valve, 430-low temperature side circulation pump inlet header, 431-low temperature side circulation pump inlet header shut-off valve, 440-circulation pump outlet header, 441-circulation pump outlet shut-off valve, 450-high temperature header, 451-high temperature header inlet shut-off valve, 452-high temperature header outlet shut-off valve, 460-low temperature header, 461-low temperature header inlet shut-off valve, 462- Cryogenic header outlet shut-off valve, 470-Check valve, 480-Regulating valve, 510-Compression side heat exchanger, 520-Expansion side heat exchanger, 530-Compressor, 540-Expander, 550-Air tank, 600-Minimum flow recirculation line of circulating pump, 610-Minimum flow recirculation line inlet shut-off valve of circulating pump, 620-Minimum flow recirculation line regulating valve of circulating pump, 630-Minimum flow recirculation line outlet shut-off valve of circulating pump, 700-Compression side start-up recirculation line, 710-Compression side start-up recirculation line inlet shut-off valve, 720-Compression side start-up recirculation line outlet shut-off valve, 800-Expansion side start-up recirculation line, 810-Expansion side start-up recirculation line shut-off valve. Detailed Implementation

[0032] The following detailed description, in conjunction with the accompanying drawings, illustrates the implementation of this utility model. However, these descriptions do not constitute a limitation of the present utility model and are merely illustrative. Furthermore, the advantages of this utility model will become clearer and easier to understand through this description.

[0033] Referring to the accompanying drawings: A pressure storage power station thermal storage system with a common thermal storage medium circulation pump is characterized by including a high-temperature storage tank 100, a low-temperature storage tank 200, and a common circulation pump 300.

[0034] The high-temperature storage tank 100 is connected to the circulation pump inlet header 410 via the high-temperature side circulation pump inlet header 420, and the low-temperature storage tank 200 is connected to the circulation pump inlet header 410 via the low-temperature side circulation pump inlet header 430. The circulation pump inlet header 410 is connected to the common circulation pump 300.

[0035] The common circulation pump 300 is connected to the circulation pump outlet header 440. The circulation pump outlet header 440 is connected to the high temperature storage tank 100 through the high temperature header 450 and to the low temperature storage tank 200 through the low temperature header 460.

[0036] The high-temperature header 450 is connected to a compression-side heat exchanger 510, and the low-temperature header 460 is connected to an expansion-side heat exchanger 520. The outlet of the compression-side heat exchanger 510 is connected to the high-temperature header 450, and the inlet of the compression-side heat exchanger 510 is connected to the circulating pump outlet header 440. The outlet of the expansion-side heat exchanger 520 is connected to the low-temperature header 460, and the inlet of the expansion-side heat exchanger 520 is connected to the circulating pump outlet header 440.

[0037] The high-temperature storage tank 100 is connected to the high-temperature side circulation pump inlet header 420 through the high-temperature storage tank inlet and outlet shut-off valve 110, and the high-temperature side circulation pump inlet header 421 is provided on the high-temperature side circulation pump inlet header 420.

[0038] The cryogenic storage tank 200 is connected to the inlet header of the cryogenic side circulation pump 430 via the cryogenic storage tank inlet / outlet shut-off valve 210, and the cryogenic side circulation pump inlet header 430 is provided with a cryogenic side circulation pump inlet header shut-off valve 431.

[0039] A circulation pump inlet shut-off valve 411 is provided on the circulation pump inlet header 410, and a circulation pump outlet shut-off valve 441 is provided on the circulation pump outlet header 440.

[0040] A high-temperature main pipe inlet shut-off valve 451 is provided at the inlet of the high-temperature main pipe 450, and a high-temperature main pipe outlet shut-off valve 452 is provided at the outlet. A low-temperature main pipe inlet shut-off valve 461 is provided at the inlet of the low-temperature main pipe 460, and a low-temperature main pipe outlet shut-off valve 462 is provided at the outlet.

[0041] It also includes a minimum flow recirculation pipeline 600 for the circulating pump; the inlet of the minimum flow recirculation pipeline 600 is connected to the outlet main pipe 440 of the circulating pump, and the outlet is connected to the inlet main pipe 410 of the circulating pump. The minimum flow recirculation pipeline 600 is provided with an inlet shut-off valve 610, a regulating valve 620, and an outlet shut-off valve 630 from the inlet to the outlet.

[0042] It also includes a compression-side start-up recirculation pipeline 700; the inlet of the compression-side start-up recirculation pipeline 700 is connected to the high-temperature main pipe 450, the connection is located between the high-temperature main pipe outlet shut-off valve 452 and the compression-side heat exchanger 510, and the outlet of the compression-side start-up recirculation pipeline 700 is connected to the low-temperature storage tank 200.

[0043] The compression-side start-up recirculation pipeline 700 is equipped with a compression-side start-up recirculation pipeline inlet shut-off valve 710 at the inlet and a compression-side start-up recirculation pipeline outlet shut-off valve 720 at the outlet.

[0044] It also includes an expansion-side start-up recirculation pipeline 800; the inlet of the expansion-side start-up recirculation pipeline 800 is connected to the cryogenic header 460, the connection is located between the cryogenic header outlet shut-off valve 462 and the expansion-side heat exchanger 520, and the outlet of the expansion-side start-up recirculation pipeline 800 is connected to the circulating pump inlet header 410.

[0045] An expansion-side start-up recirculation pipeline shut-off valve 810 is provided on the expansion-side start-up recirculation pipeline 800.

[0046] Both the high-temperature header 450 and the low-temperature header 460 are equipped with a check valve 470 and a regulating valve 480.

[0047] An operation method for a compression energy storage power station thermal storage system using a public thermal storage medium circulation pump, characterized by comprising an operation method for a compression energy storage stage and an operation method for an expansion power generation stage;

[0048] The operation method of the compressed energy storage stage includes the following steps:

[0049] Step 1: Open the inlet and outlet shut-off valves 210 of the cryogenic storage tank, the inlet main pipe shut-off valve 431 of the cryogenic side circulation pump, the inlet shut-off valve 411 of the circulation pump, and the outlet shut-off valve 441 of the circulation pump; close the inlet main pipe shut-off valve 421 of the high-temperature side circulation pump and the inlet shut-off valve 461 of the cryogenic main pipe.

[0050] Step 2: Open the inlet shut-off valve 610 of the minimum flow recirculation pipeline of the circulating pump, the regulating valve 620 of the minimum flow recirculation pipeline of the circulating pump, and the outlet shut-off valve 630 of the minimum flow recirculation pipeline of the circulating pump. Adjust the flow rate of the heat storage medium flowing through the common circulating pump 300 by adjusting the opening degree of the regulating valve 620 of the minimum flow recirculation pipeline of the circulating pump 600.

[0051] Step 3: The heat storage medium is pressurized by the common circulation pump 300 and enters the compression side heat exchanger 510; when the outlet temperature of the compression side heat exchanger 510 is not qualified, the heat storage medium returns to the low temperature storage tank 200 through the compression side start-up recirculation pipeline 700; when the outlet temperature of the compression side heat exchanger 510 is qualified, the compression side start-up recirculation pipeline 700 is closed, and the heat storage medium enters the high temperature storage tank 100 for storage through the high temperature header 450.

[0052] The operation method of the expansion power generation stage includes the following steps:

[0053] Step 1: Open the inlet and outlet shut-off valves 110 of the high temperature storage tank, the inlet main pipe shut-off valve 421 of the high temperature side circulation pump, the inlet shut-off valve 411 of the circulation pump, and the outlet shut-off valve 441 of the circulation pump; close the inlet main pipe shut-off valve 431 of the low temperature side circulation pump and the inlet shut-off valve 451 of the high temperature main pipe.

[0054] Step 2: Open the inlet shut-off valve 610 of the minimum flow recirculation pipeline of the circulating pump, the regulating valve 620 of the minimum flow recirculation pipeline of the circulating pump, and the outlet shut-off valve 630 of the minimum flow recirculation pipeline of the circulating pump. Adjust the flow rate of the heat storage medium flowing through the common circulating pump 300 by adjusting the opening degree of the regulating valve 620 of the minimum flow recirculation pipeline of the circulating pump 600.

[0055] Step 3: The heat storage medium is pressurized by the common circulation pump 300 and enters the expansion side heat exchanger 520; when the outlet temperature of the expansion side heat exchanger 520 is not qualified, the heat storage medium returns to the inlet of the common circulation pump 300 through the expansion side start-up recirculation pipeline 800; when the outlet temperature of the expansion side heat exchanger 520 is qualified, the expansion side start-up recirculation pipeline 800 is closed, and the heat storage medium enters the cryogenic storage tank 200 for storage through the cryogenic header 460.

[0056] To ensure that the efficiency of a single common circulation pump 300 does not deviate significantly from that of the high and low temperature circulation pumps when set up individually under different operating phases, the configuration scheme of the common circulation pump 300 can be determined based on the duration of the compression energy storage phase and the expansion power generation phase:

[0057] When the duration of the compression energy storage phase and the duration of the expansion power generation phase are equal, the common circulation pump 300 is configured with 2×100% capacity or 3×50% capacity. In both the compression energy storage phase and the expansion power generation phase, the common circulation pump 300 operates in a 1-operation-1-standby or 2-operation-1-standby mode.

[0058] When the ratio of the duration of the compression energy storage phase to the duration of the expansion power generation phase is 2:1, the common circulation pump 300 adopts a 3×50% capacity configuration. During the compression energy storage phase, the common circulation pump 300 operates in a 1-operation 2-standby mode, and during the expansion power generation phase, the common circulation pump 300 operates in a 2-operation 1-standby mode.

[0059] When the ratio of the duration of the compression energy storage phase to the duration of the expansion power generation phase is 3:2, the common circulation pump 300 adopts a 4×33% capacity configuration. During the compression energy storage phase, the common circulation pump 300 operates in a 2-operation 2-standby mode, and during the expansion power generation phase, the common circulation pump 300 operates in a 3-operation 1-standby mode.

[0060] Other different duration ratio schemes should be configured in accordance with the above principles. According to the above configuration scheme, whether it is the compression energy storage stage or the expansion power generation stage, the operating point of a single public circulation pump 300 can be guaranteed to be in the highest efficiency range, ensuring applicability to high and low temperature conditions and improving the economic efficiency of power plant operation.

[0061] In practical use, the high-temperature storage tank 100 is used to store the high-temperature heat storage medium from the compression-side heat exchanger 510 during the compression energy storage process; the low-temperature storage tank 200 is used to store the low-temperature heat storage medium from the expansion-side heat exchanger 520 during the expansion power generation process; depending on the characteristics of the heat storage medium, the storage tanks can be in the form of spherical tanks, horizontal tanks, and vertical tanks; the number of storage tanks is determined according to the capacity of the heat storage system, and this utility model uses two high-temperature storage tanks 100 and two low-temperature storage tanks 200 as an example; the heat storage medium is suitable for water, heat transfer oil, etc.

[0062] The function of the common circulation pump 300 is to increase the pressure of the heat storage medium and overcome the flow resistance of the heat storage medium in the pipeline and heat exchanger equipment. In the compression energy storage stage, the low-temperature medium in the low-temperature storage tank 200 is pressurized and transported to the compression side heat exchanger 510 for heat absorption, and then pumped into the high-temperature storage tank 100 for storage. In the expansion power generation stage, the high-temperature medium in the high-temperature storage tank 100 is pressurized and transported to the expansion side heat exchanger 520 for heat release, and then pumped into the low-temperature storage tank 200 for storage. The common circulation pump 300 is generally a centrifugal pump. When the system flow is small, a screw pump can also be used. The selection of the common circulation pump 300 should be adapted to both high and low temperature media. According to the system capacity and the energy storage and release time, the common circulation pump 300 can be configured with 2×100% capacity, 3×50% capacity, or 4×33% capacity.

[0063] The function of the minimum flow recirculation line 600 of the circulating pump is to prevent cavitation in the common circulating pump 300 and ensure that the flow rate of the heat storage medium flowing through the common circulating pump 300 is above the minimum allowable flow rate of the common circulating pump 300 during startup and low load stages. The heat storage medium exceeding the flow rate required by the heat exchange system returns to the inlet of the common circulating pump 300 through the minimum flow recirculation line 600.

[0064] The function of the compressor-side start-up recirculation pipeline 700 is to transport the heat storage medium at the outlet of the compressor-side heat exchanger 510 back to the cryogenic storage tank 200 during the start-up phase of the compressor energy storage system, when the temperature of the heat storage medium at the outlet of the compressor-side heat exchanger 510 has not risen to the rated temperature; when the unit is running normally, the compressor-side start-up recirculation pipeline 700 is closed.

[0065] The function of the expansion-side start-up recirculation pipeline 800 is to transport the heat storage medium at the outlet of the expansion-side heat exchanger 520 back to the inlet of the common circulation pump 300 during the start-up and warm-up phases of the expansion power generation system, when the temperature of the heat storage medium at the outlet of the expansion-side heat exchanger 520 has not dropped to the rated temperature, so as to effectively utilize this part of the heat and at the same time prevent the high-temperature heat storage medium from entering the low-temperature storage tank 200, causing the temperature rise of the low-temperature storage tank 200 to be too large. When the unit is running normally, the expansion-side start-up recirculation pipeline 800 is closed.

[0066] All other unspecified parts belong to the prior art.

Claims

1. A pressure-storage power station thermal storage system with a public thermal storage medium circulation pump, characterized in that: Includes a high-temperature storage tank (100), a low-temperature storage tank (200), and a common circulation pump (300); The high-temperature storage tank (100) is connected to the circulation pump inlet header (410) via the high-temperature side circulation pump inlet header (420), the low-temperature storage tank (200) is connected to the circulation pump inlet header (410) via the low-temperature side circulation pump inlet header (430), and the circulation pump inlet header (410) is connected to the common circulation pump (300). The common circulation pump (300) is connected to the circulation pump outlet header (440), and the circulation pump outlet header (440) is connected to the high temperature storage tank (100) through the high temperature header (450) and to the low temperature storage tank (200) through the low temperature header (460). The high-temperature header (450) is connected to a compression-side heat exchanger (510), and the low-temperature header (460) is connected to an expansion-side heat exchanger (520).

2. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 1, characterized in that: The high-temperature storage tank (100) is connected to the high-temperature side circulation pump inlet header (420) through the high-temperature storage tank inlet and outlet shut-off valve (110), and the high-temperature side circulation pump inlet header (420) is provided with a high-temperature side circulation pump inlet header shut-off valve (421). The cryogenic storage tank (200) is connected to the inlet header (430) of the cryogenic storage tank through the inlet and outlet shut-off valve (210). The inlet header (430) of the cryogenic circulation pump is equipped with a shut-off valve (431). A circulating pump inlet shut-off valve (411) is provided on the circulating pump inlet header (410), and a circulating pump outlet shut-off valve (441) is provided on the circulating pump outlet header (440). A high-temperature main pipe inlet shut-off valve (451) is provided at the inlet of the high-temperature main pipe (450), and a high-temperature main pipe outlet shut-off valve (452) is provided at the outlet. A low-temperature main pipe inlet shut-off valve (461) is provided at the inlet of the low-temperature main pipe (460), and a low-temperature main pipe outlet shut-off valve (462) is provided at the outlet.

3. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 2, characterized in that: It also includes a minimum flow recirculation pipeline (600) for the circulating pump; the inlet of the minimum flow recirculation pipeline (600) is connected to the outlet main pipe (440) of the circulating pump, and the outlet is connected to the inlet main pipe (410) of the circulating pump. The minimum flow recirculation pipeline (600) is provided with an inlet shut-off valve (610), a regulating valve (620) and an outlet shut-off valve (630) for the minimum flow recirculation pipeline from the inlet to the outlet.

4. The thermal storage system of a pressure storage power station with a public thermal storage medium circulation pump according to claim 2, characterized in that: It also includes a compression-side start-up recirculation pipeline (700); the inlet of the compression-side start-up recirculation pipeline (700) is connected to the high-temperature main pipe (450), the connection is located between the high-temperature main pipe outlet shut-off valve (452) and the compression-side heat exchanger (510), and the outlet of the compression-side start-up recirculation pipeline (700) is connected to the low-temperature storage tank (200).

5. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 4, characterized in that: The compression-side start-up recirculation pipeline (700) is equipped with a compression-side start-up recirculation pipeline inlet shut-off valve (710) at the inlet and a compression-side start-up recirculation pipeline outlet shut-off valve (720) at the outlet.

6. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 2, characterized in that: It also includes an expansion-side start-up recirculation pipeline (800); the inlet of the expansion-side start-up recirculation pipeline (800) is connected to the cryogenic header (460), the connection is located between the cryogenic header outlet shut-off valve (462) and the expansion-side heat exchanger (520), and the outlet of the expansion-side start-up recirculation pipeline (800) is connected to the circulating pump inlet header (410).

7. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 6, characterized in that: An expansion-side start-up recirculation line shut-off valve (810) is provided on the expansion-side start-up recirculation line (800).

8. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 2, characterized in that: Both the high-temperature header (450) and the low-temperature header (460) are equipped with a check valve (470) and a regulating valve (480).

9. The thermal storage system of a pressure-storage power station with a public thermal storage medium circulation pump according to claim 1, characterized in that: When the duration of the compression energy storage phase and the duration of the expansion power generation phase are equal, the common circulation pump (300) is configured with 2×100% capacity or 3×50% capacity. In both the compression energy storage phase and the expansion power generation phase, the common circulation pump (300) operates in a 1-operation-1-standby or 2-operation-1-standby mode. When the ratio of the duration of the compression energy storage stage to the duration of the expansion power generation stage is 2:1, the common circulation pump (300) adopts a 3×50% capacity configuration. During the compression energy storage stage, the common circulation pump (300) operates in a 1-operation 2-standby mode, and during the expansion power generation stage, the common circulation pump (300) operates in a 2-operation 1-standby mode. When the ratio of the duration of the compression energy storage phase to the duration of the expansion power generation phase is 3:2, the common circulation pump (300) adopts a 4×33% capacity configuration. During the compression energy storage phase, the common circulation pump (300) operates in a 2-operation 2-standby mode, and during the expansion power generation phase, the common circulation pump (300) operates in a 3-operation 1-standby mode.

Images