Energy-saving cooling system of nuclear power large-scale energy storage station

Abstract

An energy-saving cooling system of a large nuclear power energy storage station comprises a water-cooling water chilling unit, a closed cooling tower, a cooling water pump, a heat storage water tank, a heat recovery pump, a constant-pressure water supplementing water tank, a cold / hot water pump and a battery module which are connected through pipelines and provided with an electric two-way regulating valve, an electric two-way opening and closing valve and a temperature sensor to form five functional systems. The three systems include a tail end pipeline system, a water-cooling water chilling unit water chilling system, a hot water system, a natural cooling system and a cooling water system. The water chilling unit has the heat recovery function, condensation heat of the water chilling unit can be effectively recovered, and the annual energy utilization rate is increased; the heat storage water tank is used for storing heat, heat recycled by the water chilling unit is stored, and the heat is released when a heat source is needed at the tail end, so that the utilization of the heat source is improved, and the use of other heat sources is reduced; the cooling tower can be directly used for cooling when the outdoor temperature is low, the service time of the water chilling unit is shortened, and the refrigeration energy efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to an air-conditioning energy-saving cooling system for a large-scale nuclear power energy storage station, especially for a liquid-cooled battery energy storage station. Background Technique

[0002] With the development of society, the gap between the peak and valley of electricity consumption on the load side is increasing day by day, and the operation pressure of the power grid is getting greater and greater, posing new requirements and challenges for the stable supply and balance of electric power. Peak shaving and valley filling are important means for the power grid to regulate the peak and valley of electricity consumption.

[0003] At the same time, in order to strengthen the stable operation of the power system, it is particularly important to overall plan the scale and layout of various power sources.

[0004] With the development of technology, new energy storage has entered the stage of large-scale development from the initial stage of commercialization and has the conditions for large-scale commercial application. The innovation ability of new energy storage technology has been significantly improved, the independent control level of core technology equipment has been greatly enhanced, the standard system has been basically improved, the industrial system has become increasingly complete, and the market environment and business model have been basically mature.

[0005] New energy storage is an important technology and basic equipment for building a new power system, an important support for achieving the goals of carbon peak and carbon neutrality, and also an important field for giving birth to new domestic energy business forms and seizing new international strategic high points.

[0006] At present, battery energy storage plays a leading role in new energy storage. In particular, liquid-cooled battery energy storage can precisely manage the temperature of each battery cell, meet the increasingly high thermal management requirements under large system capacities, and is one of the main temperature control forms for large-scale energy storage power stations.

[0007] The best working temperature range of the battery is 20~30 °C, and it is generally relatively comfortable within 0~45 °C. Too high or too low temperature will have a certain impact on the charge and discharge performance, capacity characteristics and cycle life of the battery. When the temperature of the storage battery is below 0 °C, it is easy to have problems such as charging lithium deposition, discharging power decline and cycle life shortening, and an air-conditioning system is usually required to maintain the working temperature of the battery. Content of the Utility Model

[0008] In order to solve the cold and heat source problems of overcooling and overheating of liquid-cooled batteries, the utility model proposes an energy-saving cooling system for a large-scale nuclear power energy storage station.

[0009] The technical solution of this application is as follows:

[0010] A large-scale energy-saving cooling system for a nuclear power energy storage station, the equipment of which includes a water-cooled chiller 1, a closed cooling tower 2, a cooling water pump, a hot water storage tank 4, a heat recovery pump, a constant pressure make-up water tank 6, a cold / hot water pump, and a battery module 8. The water-cooled chiller 1 includes a heat recovery device 1-1, a condenser 1-2, and an evaporator 1-3. The above-mentioned equipment is connected by pipelines and is equipped with electric two-way regulating valves, electric two-way opening and closing valves, and temperature sensors, forming five functional systems, namely the terminal pipeline system, the water-cooled chiller cold water system, the hot water system, the natural cooling system, and the cooling water system;

[0011] The pipelines include a cooling water supply pipeline 10, a cooling water return pipeline 11, a heat recovery supply pipeline 12, a heat recovery return pipeline 13, a hot water supply pipeline 14, a hot water return pipeline 15, a chiller supply pipeline 16, a chiller return pipeline 17, a terminal supply pipeline 18, a terminal return pipeline 19, a natural cooling supply pipeline 20, and a natural cooling return pipeline 21.

[0012] Furthermore, the terminal pipeline system includes: a constant pressure make-up water tank 6, a temperature sensor T2, two cold / hot water pumps, a terminal supply pipeline 18, a battery module 8, a terminal return pipeline 19, and a temperature sensor T3, where:

[0013] The constant pressure make-up water tank 6 is connected to the terminal supply pipeline 18 through a pipeline; the terminal supply pipeline 18 is connected to the water supply port of the battery module 8, and the terminal return pipeline 19 is connected to the water return port of the battery module 8;

[0014] The two cold / hot water pumps are respectively a first cold / hot water pump 7-1 and a second cold / hot water pump 7-2, one for use and one for standby, and are arranged in parallel on the terminal supply pipeline 18;

[0015] The temperature sensor T2 is arranged on the terminal supply pipeline 18;

[0016] The temperature sensor T3 is arranged on the terminal return pipeline 19.

[0017] Furthermore, the water-cooled chiller cold water system, which is used to cool the battery module 8, includes: the evaporator 1-3 of the water-cooled chiller 1, a chiller supply pipeline 16, an electric two-way opening and closing valve V3, a chiller return pipeline 17, and an electric regulating valve V4, where:

[0018] The water outlet of the evaporator 1-3 of the water-cooled chiller 1 is connected to the chiller supply pipeline 16, and the chiller supply pipeline 16 is connected to the terminal supply pipeline 18;

[0019] The water inlet of the evaporator 1-3 of the water-cooled chiller 1 is connected to the chiller return pipeline 17, and the chiller return pipeline 17 is connected to the terminal return pipeline 19;

[0020] The electric control valve V3 is arranged on the water supply pipeline 16 of the chiller, and the electric control valve V4 is arranged on the water return pipeline 17 of the chiller.

[0021] Furthermore, the hot water system includes: an electric control valve V1, a hot water return pipeline 15, a heat storage water tank 4, a hot water supply pipeline 14, an electric two-way on-off valve V2, a heat recovery return pipeline 13, two heat recovery pumps, a heat recovery device 1-1 of the water-cooled chiller 1, a heat recovery supply pipeline 12, an electric two-way on-off valve V5, and a temperature sensor T1;

[0022] The working modes of the hot water system are divided into a heat storage mode and a heat release mode. Correspondingly, one side of the heat storage water tank 4 is the heat storage side, and the other side is the heat release side, where:

[0023] The lower part of the heat storage side is provided with a water outlet, and the upper part is provided with a water inlet. The lower water outlet of the heat storage side is connected to the water inlet of the heat recovery device 1-1 of the water-cooled chiller 1 through the heat recovery return pipeline 13, and the water outlet of the heat recovery device 1-1 of the water-cooled chiller 1 is connected to the upper water inlet of the heat storage side through the heat recovery supply pipeline 12; the two heat recovery pumps are respectively a first heat recovery pump 5-1 and a second heat recovery pump 5-2, one for use and one for standby, and are arranged in parallel on the heat recovery return pipeline 13; the electric two-way on-off valve V5 is arranged on the heat recovery supply pipeline 12; the temperature sensor T1 is arranged on the heat storage water tank 4;

[0024] The upper part of the heat release side is provided with a water outlet, which is connected to the hot water supply pipeline 14, and the hot water supply pipeline 14 is connected to the terminal water supply pipeline 18; the lower part of the heat release side is provided with a water inlet, which is connected to the hot water return pipeline 15, and the hot water return pipeline 15 is connected to the terminal water return pipeline 19; the electric control valve V1 is arranged on the hot water return pipeline 15, and the electric two-way on-off valve V2 is arranged on the hot water supply pipeline 14.

[0025] Furthermore, the natural cooling system includes: a natural cooling return pipeline 21, a closed cooling tower 2, a natural cooling supply pipeline 20, an electric two-way on-off valve V6, and an electric two-way on-off valve V7; where:

[0026] One end of the natural cooling return pipeline 21 is connected to the closed cooling tower 2, and the other end is connected to the terminal water return pipeline 19;

[0027] One end of the natural cooling supply pipeline 20 is connected to the closed cooling tower 2, and the other end is connected to the terminal water supply pipeline 18;

[0028] The electric two-way on-off valve V6 is arranged on the natural cooling supply pipeline 20, and the electric two-way on-off valve V7 is arranged on the natural cooling return pipeline 21.

[0029] Furthermore, the cooling water system includes: the condenser 1-2 of the water-cooled chiller 1, the closed cooling tower 2, the cooling water supply pipeline 10, two cooling water pumps, and the cooling water return pipeline 11; among which:

[0030] The water outlet of the condenser 1-2 of the water-cooled chiller 1 is connected to the water inlet of the closed cooling tower 2 through the cooling water return pipeline 11, and the water inlet of the condenser of the water-cooled chiller 1 is connected to the water outlet of the closed cooling tower 2 through the cooling water supply pipeline 10;

[0031] The two cooling water pumps are respectively the first cooling water pump 3-1 and the second cooling water pump 3-2, one in use and one in reserve, and are arranged in parallel on the cooling water supply pipeline 10.

[0032] Advantages and beneficial effects of the present utility model:

[0033] 1. The chiller adopts an efficient water-cooled chiller, and the chiller has a heat recovery function, which can effectively recover the condensation heat of the chiller and improve the annual energy utilization rate.

[0034] 2. The system uses a heat storage water tank for heat storage, stores the heat recovered by the chiller, and releases the heat when the terminal needs heat source, which improves the utilization of the heat source and reduces the use of other heat sources.

[0035] 3. The cooling water source adopts a closed cooling tower, which can directly supply cooling with the cooling tower when the outdoor temperature is low, reduces the use time of the chiller, improves the refrigeration energy efficiency of the system, and the cooling tower is a closed system, avoiding the water quality impact caused by the direct entry of cooling water into the terminal battery pack. Description of the drawings

[0036] Figure 1 It is the system structure diagram of this application;

[0037] Figure 2 It is the operation principle diagram of the water-cooled chiller cooling water system;

[0038] Figure 3 It is the operation principle diagram of the heat storage mode of the hot water system;

[0039] Figure 4 It is the operation principle diagram of the heat release mode of the hot water system;

[0040] Figure 5 It is the operation principle diagram of the natural cooling system;

[0041] Figure 6 It is the operation principle diagram of the cooling water system.

[0042] Reference numerals:

[0043] 1 Water-cooled chiller, 1-1 Heat recovery unit, 1-2 Condenser, 1-3 Evaporator, 2 Closed cooling tower, 3-1 First cooling water pump, 3-2 Second cooling water pump, 4 Hot water storage tank, 5-1 First heat recovery pump, 5-2 Second heat recovery pump, 6 Pressure stabilizing and makeup water tank, 7-1 First cold / hot water pump, 7-2 Second cold / hot water pump, 8 Battery module, 9 Maintenance manual valve, 10 Cooling water supply pipeline, 11 Cooling water return pipeline, 12 Heat recovery supply pipeline, 13 Heat recovery return pipeline, 14 Hot water supply pipeline, 15 Hot water return pipeline, 16 Chiller supply pipeline, 17 Chiller return pipeline, 18 Terminal supply pipeline, 19 Terminal return pipeline, 20 Natural cooling supply pipeline, 21 Natural cooling return pipeline, V1, V4 Electric two-way regulating valves, V2, V3, V5, V6, V7 Electric two-way on-off valves, T1, T2, T3 Temperature sensors. Detailed implementation manners

[0044] The technical solutions provided by the present application will be further described below in conjunction with specific embodiments and their accompanying drawings. In combination with the following description, the advantages and features of the present application will be clearer.

[0045] Embodiment:

[0046] As Figure 1 shown, a nuclear power large-scale energy storage station energy-saving cooling system, the equipment of which includes a water-cooled chiller 1, a closed cooling tower 2, a cooling water pump, a hot water storage tank 4, a heat recovery pump, a pressure stabilizing and makeup water tank 6, a cold / hot water pump, a battery module 8, wherein the water-cooled chiller 1 includes a heat recovery unit 1-1, a condenser 1-2, and an evaporator 1-3; the above-mentioned equipment is connected by pipelines and is equipped with electric two-way regulating valves (V1, V4), electric two-way on-off valves (V2, V3, V5, V6, V7), and temperature sensors (T1, T2, T3), forming five functional systems, namely the terminal pipeline system, the water-cooled chiller cold water system, the hot water system, the natural cooling system, and the cooling water system;

[0047] The pipelines include a cooling water supply pipeline 10, a cooling water return pipeline 11, a heat recovery supply pipeline 12, a heat recovery return pipeline 13, a hot water supply pipeline 14, a hot water return pipeline 15, a chiller supply pipeline 16, a chiller return pipeline 17, a terminal supply pipeline 18, a terminal return pipeline 19, a natural cooling supply pipeline 20, and a natural cooling return pipeline 21.

[0048] The end pipeline system includes: a constant pressure make-up water tank 6, a temperature sensor T2, two cold / hot water pumps, an end water supply pipeline 18, a battery module 8, an end water return pipeline 19, and a temperature sensor T3. The constant pressure make-up water tank 6 is connected to the end water supply pipeline 18 through a pipeline; the end water supply pipeline 18 is connected to the water supply port of the battery module 8, and the end water return pipeline 19 is connected to the water return port of the battery module 8; the two cold / hot water pumps are respectively a first cold / hot water pump 7-1 and a second cold / hot water pump 7-2, one in use and one in standby, and are arranged in parallel on the end water supply pipeline 18; the temperature sensor T2 is arranged on the end water supply pipeline 18 for detecting the water supply temperature; the temperature sensor T3 is arranged on the end water return pipeline 19 for detecting the water return temperature.

[0049] Cold / hot water is supplied to the battery module 8 through the cold / hot water pump (the first cold / hot water pump 7-1 or the second cold / hot water pump 7-2) and the end water supply pipeline 18 for battery cooling / heating. After heat exchange, the water that has been heated / cooled flows out through the end water return pipeline 19. Among them, the constant pressure make-up water tank 6 is for system constant pressure and make-up water, and the liquid level height after installation is flush with the liquid level height of the hot water storage tank 4.

[0050] The water-cooled chiller cold water system for cooling the battery module 8 includes: the evaporator 1-3 of the water-cooled chiller 1, the chiller water supply pipeline 16, the electric two-way on-off valve V3, the chiller water return pipeline 17, and the electric control valve V4. Among them: the water outlet of the evaporator 1-3 of the water-cooled chiller 1 is connected to the chiller water supply pipeline 16, and the chiller water supply pipeline 16 is connected to the end water supply pipeline 18 of the end pipeline system; the water inlet of the evaporator 1-3 of the water-cooled chiller 1 is connected to the chiller water return pipeline 17, and the chiller water return pipeline 17 is connected to the end water return pipeline 19 of the end pipeline system; the electric control valve V3 is arranged on the chiller water supply pipeline 16, and the electric control valve V4 is arranged on the chiller water return pipeline 17.

[0051] The operating principle of the water-cooled chiller cold water system is:

[0052] As Figure 2 As shown within the dashed box, when operating in the cold water system mode of the water-cooled chiller, open the electric control valve V4 and the electric two-way on-off valve V3. The high-temperature cold water after heat exchange through the battery module 8 enters the evaporator 1-3 of the water-cooled chiller 1 through the end water return pipeline 19 and the chiller water return pipeline 17 for heat exchange and cooling to become low-temperature cold water, and then passes through the chiller water supply pipeline 16, the cold / hot water pump (the first cold / hot water pump 7-1 or the second cold / hot water pump 7-2), and the end water supply pipeline 18 and is supplied to the battery module 8 for heat exchange; the energy output of the water-cooled chiller 1 is adjusted and controlled according to the temperature sensor T2.

[0053] Hot water system, comprising: an electric control valve V1, a hot water return pipe 15, a hot water storage tank 4, a hot water supply pipe 14, an electric two-way on-off valve V2, a heat recovery return pipe 13, two heat recovery pumps, a heat recovery unit 1-1 of a water-cooled chiller 1, a heat recovery supply pipe 12, an electric two-way on-off valve V5, and a temperature sensor T1; the working mode of the hot water system is divided into a heat storage mode and a heat release mode. Correspondingly, one side of the hot water storage tank 4 is the heat storage side, and the other side is the heat release side, where:

[0054] At the lower part of the heat storage side, there is a water outlet, and at the upper part, there is a water inlet. The lower water outlet of the heat storage side is connected to the water inlet of the heat recovery unit 1-1 of the water-cooled chiller 1 through the heat recovery return pipe 13, and the water outlet of the heat recovery unit 1-1 of the water-cooled chiller 1 is connected to the upper water inlet of the heat storage side through the heat recovery supply pipe 12; the two heat recovery pumps are respectively a first heat recovery pump 5-1 and a second heat recovery pump 5-2, one for use and one as a standby, arranged in parallel on the heat recovery return pipe 13; the electric two-way on-off valve V5 is arranged on the heat recovery supply pipe 12; the temperature sensor T1 is arranged on the hot water storage tank 4;

[0055] At the upper part of the heat release side, there is a water outlet, which is connected to a hot water supply pipe 14, and the hot water supply pipe 14 is connected to a terminal water supply pipe 18; at the lower part of the heat release side, there is a water inlet, which is connected to a hot water return pipe 15, and the hot water return pipe 15 is connected to a terminal return pipe 19; the electric control valve V1 is arranged on the hot water return pipe 15, and the electric two-way on-off valve V2 is arranged on the hot water supply pipe 14.

[0056] The operating principle of the hot water system is as follows:

[0057] Heat storage mode: As Figure 3 shown within the dashed box, when the water-cooled chiller 1 is in refrigeration operation, it is judged whether heat storage is required according to the temperature sensor T1. When heat storage is required, the electric two-way on-off valve V5 is opened, and the heat recovery unit 1-1 of the water-cooled chiller 1 works. The cold water in the hot water storage tank 4 enters the heat recovery unit 1-1 of the water-cooled chiller 1 through the heat recovery return pipe 13 and the heat recovery pump (the first heat recovery pump 5-1 or the second heat recovery pump 5-2), is heated up through heat exchange in the heat recovery unit 1-1, and then returns to the hot water storage tank 4 through the heat recovery supply pipe 12. In this way, a cycle is completed. After continuous cycling, the water temperature in the hot water storage tank 4 finally reaches the set temperature.

[0058] Heat release mode: As Figure 4As shown within the dashed-line box, when the battery terminal 8 needs to be heated, the electric control valves V1 and V4 are adjusted according to the temperature sensor T2. The electric two-way on-off valve V5 is in the closed state, and the electric two-way on-off valves V2 and V3 are in the open state. The low-temperature hot water after heat exchange through the battery module 8 enters the bottom of the hot water storage tank 4 after passing through the terminal return water pipe 19 and the hot water return pipe 15. The hot water at the top of the hot water storage tank 4 passes through the hot water supply pipe 14, the cold / hot water pump (the first cold / hot water pump 7-1 or the second cold / hot water pump 7-2), and the terminal water supply pipe 18 and is then supplied to the battery module 8 for heat exchange.

[0059] The natural cooling system includes: a natural cooling return water pipe 21, a closed cooling tower 2, a natural cooling water supply pipe 20, an electric two-way on-off valve V6, and an electric two-way on-off valve V7. One end of the natural cooling return water pipe 21 is connected to the closed cooling tower 2, and the other end is connected to the terminal return water pipe 19 of the terminal pipe system. One end of the natural cooling water supply pipe 20 is connected to the closed cooling tower 2, and the other end is connected to the terminal water supply pipe 18 of the terminal pipe system. The electric two-way on-off valve V6 is arranged on the natural cooling water supply pipe 20, and the electric two-way on-off valve V7 is arranged on the natural cooling return water pipe 21.

[0060] The operating principle of the natural cooling system is as follows:

[0061] As Figure 5 As shown within the dashed-line box, when the battery module 8 needs cooling and the outdoor temperature is relatively low, the electric two-way on-off valves V6 and V7 are in the open state. The high-temperature hot water after heat exchange through the battery module 8 enters the closed cooling tower 2 after passing through the terminal return water pipe 19 and the natural cooling return water pipe 21. After heat exchange in the closed cooling tower 2, it is cooled down to low-temperature cold water, and then passes through the natural cooling water supply pipe 20 and the terminal water supply main pipe 18 and is supplied to the battery module 8 for heat exchange. The fan and spray water pump of the closed cooling tower 2 are regulated according to the temperature sensor T2.

[0062] The cooling water system includes: the condenser 1-2 of the water-cooled chiller 1, a closed cooling tower 2, a cooling water supply pipe 10, two cooling water pumps, and a cooling water return pipe 11. The outlet of the condenser 1-2 of the water-cooled chiller 1 is connected to the inlet of the closed cooling tower 2 through the cooling water return pipe 11, and the inlet of the condenser of the water-cooled chiller 1 is connected to the outlet of the closed cooling tower 2 through the cooling water supply pipe 10. The two cooling water pumps are respectively the first cooling water pump 3-1 and the second cooling water pump 3-2, one for use and one as a standby, and are arranged in parallel on the cooling water supply pipe 10.

[0063] Furthermore, a maintenance manual valve 9 is also arranged on the cooling water supply pipe 10 for equipment maintenance and is normally open.

[0064] The operating principle of the cooling water system is as follows:

[0065] As Figure 6 shown within the dashed box, when the water-cooled chiller 1 is in the working state, the cooling water that has been heated up after heat exchange in the condenser 1-2 enters the closed cooling tower 2 through the cooling water return pipe 11 for heat exchange and cooling, and the cooled cooling water returns to the condenser 1-2 through the cooling water supply pipe 10 and the cooling water pump (the first cooling water pump 3-1 or the second cooling water pump 3-2) to complete the cycle.

[0066] An energy-saving cooling system for a large nuclear power energy storage station proposed in this application can automatically switch between the cooling and heating modes according to the actual usage conditions to solve the cold and heat source problems of over-cooling and over-heating of liquid-cooled batteries. In summer, a highly efficient water-cooled chiller is used for refrigeration to provide a cold source. In winter, the heat recovery function of the water-cooled chiller is utilized to recover heat to the hot water storage tank. When the battery pack of the battery module needs to be heated, the heat in the hot water storage tank is released for the battery to use; thus, additional heat sources are avoided and energy is not wasted. In winter, the closed cooling tower is used for natural cooling to replace the chiller for direct cooling to achieve the purpose of energy conservation.

[0067] The cold and heat source control mode is as follows:

[0068] When the battery module 8 needs to be cooled and the temperature sensor T2 exceeds the set upper temperature limit, the water-cooled chiller cold water system and the cooling water system operate when the outdoor air temperature is relatively high, and the natural cooling system operates when the outdoor temperature is relatively low.

[0069] When the battery module 8 needs to be heated and the temperature sensor T2 is lower than the set lower temperature limit, the heat release mode of the hot water system operates. Among them, when the chiller 1 is in the working state, the system determines whether heat storage is required according to the temperature sensor T1, that is, whether the heat storage mode of the hot water system operates, and the heat storage mode is turned on when the temperature sensor T1 is lower than the set temperature.

[0070] The above description is only a description of the preferred embodiments of this application, and is not any limitation on the scope of this application. Any changes or modifications made by any ordinary technician familiar with the field according to the disclosed technical content should be regarded as equivalent effective embodiments and fall within the scope of protection of the technical solution of this application.

Claims

1. A nuclear power large energy storage station energy-saving cooling system, characterized in that: The equipment includes a water-cooled chiller (1), a closed cooling tower (2), a cooling water pump, a hot water storage tank (4), a heat recovery pump, a constant pressure water supply tank (6), a cold / hot water pump, and a battery module (8), wherein the water-cooled chiller (1) includes a heat recovery device (1-1), a condenser (1-2), and an evaporator (1-3); the above equipment is connected by pipelines and is equipped with an electric two-way regulating valve, an electric two-way on-off valve, and a temperature sensor, forming five functional systems, namely, a terminal pipeline system, a water-cooled chiller cold water system, a hot water system, a natural cooling system, and a cooling water system; The pipelines include a cooling water supply pipeline (10), a cooling water return pipeline (11), a heat recovery supply pipeline (12), a heat recovery return pipeline (13), a hot water supply pipeline (14), a hot water return pipeline (15), a chiller supply pipeline (16), a chiller return pipeline (17), a terminal supply pipeline (18), a terminal return pipeline (19), a natural cooling supply pipeline (20), and a natural cooling return pipeline (21).

2. The energy-saving cooling system for a large nuclear power energy storage station according to claim 1, characterized in that: The terminal pipeline system comprises: a constant pressure water supply tank (6), a temperature sensor T2, two cold / hot water pumps, a terminal water supply pipeline (18), a battery module (8), a terminal water return pipeline (19) and a temperature sensor T3, wherein: The constant pressure water replenishment tank (6) is connected to the terminal water supply pipeline (18) through a pipeline; the terminal water supply pipeline (18) is connected to the water supply port of the battery module (8), and the terminal water return pipeline (19) is connected to the water return port of the battery module (8); The two cold / hot water pumps are respectively a first cold / hot water pump (7-1) and a second cold / hot water pump (7-2), one for use and one for backup, and are arranged in parallel on the terminal water supply pipeline (18); The temperature sensor T2 is arranged on the terminal water supply pipe (18); The temperature sensor T3 is arranged on the terminal water return pipe (19).

3. The energy-saving cooling system for a large nuclear power energy storage station according to claim 1, characterized in that: The water-cooled chiller cold water system is used to cool the battery module (8), and comprises: an evaporator (1-3) of the water-cooled chiller (1), a chiller water supply pipeline (16), an electric two-way on-off valve V3, a chiller water return pipeline (17), and an electric regulating valve V4, wherein: The water outlet of the evaporator (1-3) of the water-cooled chiller (1) is connected to the chiller water supply pipeline (16), and the chiller water supply pipeline (16) is connected to the terminal water supply pipeline (18); The water inlet of the evaporator (1-3) of the water-cooled chiller (1) is connected to the chiller return pipe (17), and the chiller return pipe (17) is connected to the terminal return pipe (19); The electric regulating valve V3 is arranged on the water supply pipe (16) of the chiller, and the electric regulating valve V4 is arranged on the water return pipe (17) of the chiller.

4. The energy-saving cooling system for a large nuclear power energy storage station according to claim 1, characterized in that: The hot water system comprises: an electric regulating valve V1, a hot water return pipe (15), a hot water storage tank (4), a hot water supply pipe (14), an electric two-way on-off valve V2, a heat recovery return pipe (13), two heat recovery pumps, a heat recovery device (1-1) of a water-cooled chiller (1), a heat recovery supply pipe (12), an electric two-way on-off valve V5 and a temperature sensor T1; The hot water system working mode is divided into a heat storage mode and a heat release mode. Accordingly, one side of the hot water storage tank (4) is a heat storage side, and the other side is a heat release side, wherein: A water outlet is provided at the lower part of the heat storage side, and a water inlet is provided at the upper part. The lower water outlet of the heat storage side is connected to the water inlet of the heat recovery device (1-1) of the water-cooled chiller (1) through a heat recovery return pipe (13), and the water outlet of the heat recovery device (1-1) of the water-cooled chiller (1) is connected to the upper water inlet of the heat storage side through a heat recovery water supply pipe (12); the two heat recovery pumps are respectively a first heat recovery pump (5-1) and a second heat recovery pump (5-2), one for use and one for backup, and are arranged in parallel on the heat recovery return pipe (13); the electric two-way on-off valve V5 is arranged on the heat recovery water supply pipe (12); the temperature sensor T1 is arranged on the heat storage water tank (4); The upper portion of the heat release side is provided with a water outlet, and is connected to a hot water supply pipe (14), and the hot water supply pipe (14) is connected to a terminal water supply pipe (18); the lower portion of the heat release side is provided with a water inlet, and is connected to a hot water return pipe (15), and the hot water return pipe (15) is connected to a terminal water return pipe (19); the electric regulating valve V1 is arranged on the hot water return pipe (15), and the electric two-way on-off valve V2 is arranged on the hot water supply pipe (14).

5. The energy-saving cooling system for a large nuclear power energy storage station according to claim 1, characterized in that: The natural cooling system comprises: a natural cooling water return pipe (21), a closed cooling tower (2), a natural cooling water supply pipe (20), an electric two-way on-off valve V6, and an electric two-way on-off valve V7; wherein: One end of the natural cooling water return pipe (21) is connected to the closed cooling tower (2), and the other end is connected to the terminal water return pipe (19); One end of the natural cooling water supply pipeline (20) is connected to the closed cooling tower (2), and the other end is connected to the terminal water supply pipeline (18); The electric two-way on-off valve V6 is arranged on the natural cooling water supply pipe (20), and the electric two-way on-off valve V7 is arranged on the natural cooling water return pipe (21).

6. The energy-saving cooling system for a large nuclear power energy storage station according to claim 1, characterized in that: The cooling water system comprises: a condenser (1-2) of a water-cooled chiller (1), a closed cooling tower (2), a cooling water supply pipeline (10), two cooling water pumps, and a cooling water return pipeline (11); wherein: The water outlet of the condenser (1-2) of the water-cooled chiller (1) is connected to the water inlet of the closed cooling tower (2) via a cooling water return pipe (11), and the water inlet of the condenser of the water-cooled chiller (1) is connected to the water outlet of the closed cooling tower (2) via a cooling water supply pipe (10); The two cooling water pumps are respectively a first cooling water pump (3-1) and a second cooling water pump (3-2), one for use and one for backup, and are arranged in parallel on the cooling water supply pipeline (10).

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