Temperature control system and method for hydrogen energy power station with waste heat comprehensive utilization

Abstract

The application relates to a hydrogen energy storage power station temperature control system and method for comprehensive utilization of waste heat, comprising a first constant-pressure water supplementing subsystem and a first heat exchange loop and a second heat exchange loop connected with the first constant-pressure water supplementing subsystem, and providing an overall water cooling system and a temperature control method suitable for a multi-path hydrogen-electric coupling system of a hydrogen energy storage power station. A plurality of devices with different regions and different functions share one set of water cooling systems, waste heat of the devices in multiple links of the system is uniformly recycled, centralized control is realized, system efficiency is improved, and the cost of the cooling system is reduced.

Description

Technical Field

[0001] This invention relates to the fields of cooling systems and new energy utilization technology, and in particular to a temperature control system and method for a hydrogen energy storage power station that comprehensively utilizes waste heat. Background Technology

[0002] A hydrogen energy storage power station is an energy storage station that uses an "electricity-hydrogen-electricity" conversion method. It utilizes renewable energy to convert electrical energy into hydrogen energy for storage, and then generates electricity through hydrogen fuel cells when needed. This energy storage method enables large-scale, long-term, and wide-area electricity storage, helping to solve the power balance problem in the power system. Simultaneously, hydrogen energy storage power stations can also play a role in peak shaving and frequency regulation at key grid nodes, supporting the safe and stable operation of the power system.

[0003] A conventional hydrogen energy storage power station consists of a combination of several interconnected functional systems, including: a hydrogen production system (water electrolysis system), which splits water into hydrogen and oxygen and is the foundation of the hydrogen energy storage power station. This system requires electricity to operate and is typically powered by renewable energy sources or the power grid; a hydrogen storage system, where the hydrogen produced by the water electrolysis system is collected and stored to supply the fuel cell system when needed. The hydrogen is usually compressed or liquefied to increase storage density and stored in specialized storage devices; a fuel cell system, which uses the reaction of hydrogen and oxygen to produce electricity and water, achieving the output of electrical energy. This process is reversible and does not produce harmful gas emissions; and a power generation system, where, when higher power and energy output are required, the power station can also use generators and other equipment to burn hydrogen into hydrocarbon fuels, generating mechanical energy to drive the generator to produce electricity.

[0004] Corresponding to the above functional systems, a typical hydrogen energy storage power station often includes electrical equipment such as DC converters and transformers, as well as hydrogen energy equipment such as electrolyzers and fuel cells. These specific devices will generate heat during operation, and targeted heat dissipation designs are required to ensure the normal operation of the equipment.

[0005] In the current technology, because different types of equipment generate different amounts of heat and temperatures during operation, different cooling methods are usually used for specific equipment to ensure normal operation and optimal performance. For example, equipment such as converters and transformers typically use separate air-cooling or liquid-cooling systems for heat dissipation; while hydrogen energy equipment such as electrolyzers and fuel cells require additional independent water-cooling systems for heat dissipation. Correspondingly, the cooling systems equipped with the aforementioned specific functional equipment all require independent temperature control to ensure that the temperature of each functional device is within the optimal temperature range during operation.

[0006] However, the decentralized and independent cooling systems for each electrical and hydrogen energy device inevitably require necessary redundancy configurations for operational safety. This results in excessive cooling redundancy in the overall hydrogen energy storage power station, leading to poor economic efficiency and high energy consumption. Consequently, the operating load of the cooling system has a significant negative impact on the overall operating efficiency of the hydrogen energy storage power station. At the same time, due to the decentralized and independent nature of the cooling systems, the waste heat generated during the operation of each functional device is released in a dispersed manner, failing to form a centralized and effective utilization, resulting in significant waste of system waste heat and hindering further improvement in the overall operating efficiency of the hydrogen energy storage power station. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention proposes a temperature control system and method for hydrogen energy storage power stations that comprehensively utilizes waste heat. It provides an integrated water cooling system and temperature control method suitable for multi-path hydrogen-electric coupling systems in hydrogen energy storage power stations. Multiple devices with different areas and functions share a single water cooling system, which unifies and utilizes waste heat from multiple components of the system, centrally controls it, improves system efficiency, and reduces cooling system costs.

[0008] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0009] A temperature control system for a hydrogen energy storage power station that comprehensively utilizes waste heat is characterized in that it includes a first constant-pressure water supply subsystem and a first heat exchange loop and a second heat exchange loop respectively connected to the first constant-pressure water supply subsystem.

[0010] The first constant pressure water supply subsystem includes a demineralized water tank, a first water supply pump group, a first constant pressure tank assembly, and a second constant pressure tank assembly. The demineralized water tank is connected to the pure water system and receives and stores pure water. The first water supply pump group includes at least a first water supply pump and a second water supply pump connected in parallel. The first water supply pump is connected to the first constant pressure tank assembly, and the second water supply pump is connected to the second constant pressure tank assembly. The outlets of the first water supply pump and the second water supply pump are connected through at least one closable control valve.

[0011] The first heat exchange circuit includes a first plate heat exchanger, a first cooling tower and a first regulating water pump group connected in sequence, and also includes a first hot water storage tank connected in parallel with the first cooling tower. The first plate heat exchanger is connected to the hydrogen production system and the DC converter through the first cooling circuit and performs temperature control on the hydrogen production system and the DC converter by exchanging heat with the first cooling circuit through the first heat exchange circuit.

[0012] The second heat exchange circuit includes a second plate heat exchanger, a second cooling tower, and a second regulating water pump group connected in sequence, and also includes a second hot water storage tank connected in parallel with the second cooling tower. The second plate heat exchanger is connected to the fuel cell system through the second cooling circuit and exchanges heat with the second cooling circuit to control the temperature of the fuel cell system.

[0013] The first hot water storage tank and the second hot water storage tank are connected in parallel to the first waste heat utilization circuit and exchange heat with the first waste heat utilization circuit through the first heat exchange circuit and the second heat exchange circuit to provide heat to the heating system;

[0014] The first pressure tank assembly is connected to the first cooling circuit, and the second pressure tank assembly is connected to the second cooling circuit.

[0015] Furthermore, the first water replenishment pump group also includes a third water replenishment pump, which is connected in parallel with the first and second water replenishment pumps. The outlets of the third water replenishment pump, the first water replenishment pump, and the second water replenishment pump are respectively connected through at least one closable control valve.

[0016] Furthermore, the first heat exchange circuit also includes a cooling branch circuit connected in parallel to the first plate heat exchanger, the cooling branch circuit being connected to and cooling the hydrogen storage system.

[0017] Furthermore, it also includes a second constant-pressure water supply subsystem connected to the first waste heat utilization circuit, and the second constant-pressure water supply subsystem is connected to the tap water system.

[0018] Furthermore, the first regulating water pump group and the second regulating water pump group each include two regulating water pumps connected in parallel.

[0019] The present invention also relates to a temperature control method for a hydrogen energy storage power station, characterized in that the temperature control system described above is used to control the temperature of the hydrogen energy storage power station.

[0020] Furthermore, this includes performing one or more of the following steps synchronously or asynchronously:

[0021] A1. Determine whether the outlet temperature of the first plate heat exchanger connected to the first cooling circuit exceeds the first preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger connected to the first cooling circuit exceeds the first preset threshold range, increase or decrease the flow rate of the first regulating water pump group accordingly.

[0022] A2. Determine whether the outlet temperature of the second plate heat exchanger connected to the second cooling circuit exceeds the second preset threshold range. When it is determined that the outlet temperature of the second plate heat exchanger connected to the second cooling circuit exceeds the second preset threshold range, increase or decrease the flow rate of the second regulating water pump group accordingly.

[0023] A3. Determine whether the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the third preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the third preset threshold range, open the electric valve of the first cooling tower.

[0024] A4. Determine whether the outlet temperature of the second plate heat exchanger in the second heat exchange circuit exceeds the fourth preset threshold range. When it is determined that the outlet temperature of the second plate heat exchanger in the second heat exchange circuit exceeds the fourth preset threshold range, open the electric valve of the second cooling tower.

[0025] A5. Determine whether the pressure after the water pump in the first cooling circuit exceeds the fifth preset threshold range. When the pressure after the water pump in the first cooling circuit exceeds the fifth preset threshold range, increase or decrease the water pump flow rate of the first cooling circuit accordingly.

[0026] Furthermore, it also includes performing one or more of the following steps synchronously or asynchronously:

[0027] B1. Determine whether the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the sixth preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger in the first heat exchange circuit does not exceed the sixth preset threshold range, open the valve of the first hot water storage tank.

[0028] B2. Determine whether the temperature of the second hot water storage tank in the second heat exchange circuit exceeds the seventh preset threshold range. When it is determined that the temperature of the second hot water storage tank in the second heat exchange circuit does not exceed the seventh preset threshold range, open the valve of the second hot water storage tank.

[0029] Furthermore, step A3 also includes determining whether the valve of the first hot water storage tank is open; when it is determined that the valve of the first hot water storage tank is not open, the electric valve of the first cooling tower is opened; when it is determined that the valve of the first hot water storage tank is open, it is further determined whether the outlet temperature of the first plate heat exchanger of the first heat exchange circuit exceeds the third preset threshold range.

[0030] Step A4 further includes determining whether the valve of the second hot water storage tank is open. If the valve of the second hot water storage tank is not open, the electric valve of the second cooling tower is opened. If the valve of the second hot water storage tank is open, the outlet temperature of the second plate heat exchanger of the second heat exchange circuit is further determined to be within the range of the fourth preset threshold.

[0031] The beneficial effects of this invention are as follows:

[0032] The present invention provides a temperature control system and method for hydrogen energy storage power stations that utilizes waste heat. This system provides an integrated water cooling system and temperature control method suitable for multi-path hydrogen-electric coupling systems in hydrogen energy storage power stations. Multiple devices with different areas and functions share a single water cooling system. This system unifies and centrally controls the waste heat from multiple components of the system, improves system efficiency, reduces cooling system costs, and solves problems such as dispersed cooling systems, high costs, high energy consumption, waste of system waste heat, and low system efficiency in existing hydrogen energy storage power stations. Attached Figure Description

[0033] Figure 1This is a schematic diagram of the temperature control system for a hydrogen energy storage power station that utilizes waste heat according to the present invention.

[0034] Figure 2 This is a schematic diagram of the constant pressure water supply subsystem, a preferred embodiment of the temperature control system of the present invention.

[0035] Figure 3 This is a schematic diagram of the first heat exchange loop structure of a preferred embodiment of the temperature control system of the present invention.

[0036] Figure 4 This is a schematic diagram of the second heat exchange loop structure of a preferred embodiment of the temperature control system of the present invention.

[0037] Explanation of the attached figures: 1-First constant pressure water supply subsystem, 11-Demineralized water tank, 12-First water supply pump group, 121-First water supply pump, 122-Second water supply pump, 123-Third water supply pump, 13-First constant pressure tank assembly, 14-Second constant pressure tank assembly, 2-First heat exchange loop, 21-First plate heat exchanger, 22-First cooling tower, 23-First regulating water pump group, 24-First hot water storage tank, 25-Cooling branch loop, 3-Second heat exchange loop, 31-Second plate heat exchanger, 32-Second cooling tower, 33-Second regulating water pump group, 34-Second hot water storage tank, 4-First cooling loop, 5-Second cooling loop, 6-First waste heat utilization loop, 61-Second constant pressure water supply subsystem, 71-Hydrogen production system, 72-DC converter, 73-Fuel cell system, 74-Hydrogen storage system, 81-Heating system. Detailed Implementation

[0038] To better understand the content of this invention, a detailed description will be provided in conjunction with the accompanying drawings and embodiments.

[0039] like Figure 1 The diagram shows the structure of the temperature control system for the hydrogen energy storage power station utilizing waste heat according to the present invention. It integrates water cooling for the main cooling components in the hydrogen energy storage power station, including the hydrogen production system 71, DC converter 72, fuel cell system 73, and hydrogen storage system 74. A first heat exchange loop 2 is provided for the hydrogen production system 71, DC converter 72, and optional hydrogen storage system 74; a second heat exchange loop 3 is provided for the fuel cell system 73.

[0040] Specifically, such as Figure 3The diagram shows a schematic of the first heat exchange loop 2 in a preferred embodiment. The first heat exchange loop 2 uses a first plate heat exchanger 21 as the main heat exchange component, and exchanges heat with the first cooling loop 4 (connecting the hydrogen production system 71 and the DC-DC converter 72) to achieve cooling of the hydrogen production system 71 and the DC-DC converter 72. The first heat exchange loop 2 dissipates heat to the outside atmosphere through the first cooling tower 22, and the flow rate in the loop is regulated and controlled by the first regulating water pump group 23. Specifically, the first heat exchange loop 2 also includes a first hot water storage tank 24 connected in parallel to the first cooling tower 22, used to store the higher-temperature cooling water after the first plate heat exchanger 21 has exchanged heat with the first cooling loop 4. The first hot water storage tank 24 forms an additional heat exchange path independent of the first heat exchange loop 2 and the first plate heat exchanger 21 by connecting to the first waste heat utilization loop 6, allowing the heat from the higher-temperature cooling water in the first hot water storage tank 24 to be transferred through the first waste heat utilization loop 6. Preferably, the first heat exchange circuit 2 further includes a cooling branch circuit 25 connected in parallel to the first plate heat exchanger 21. The cooling branch circuit 25 connects to and cools the hydrogen storage system 74. That is, the hydrogen storage system 74 is cooled by the lower temperature cooling water after being cooled by the first cooling tower 22, and the higher temperature cooling water after heat exchange is combined with the cooling water at the outlet of the first plate heat exchanger 21 and then enters the first cooling tower 22 together, forming a branch circulation outside the main cooling water circulation in the first heat exchange circuit 2.

[0041] like Figure 4 The diagram shows a schematic of the second heat exchange loop 3 in a preferred embodiment. The second heat exchange loop 3 uses a second plate heat exchanger 31 as the main heat exchange component, exchanging heat between the second cooling loop 5 (connected to the fuel cell system 73) and the second heat exchange loop 3 to cool the fuel cell system 73. The second heat exchange loop 3 dissipates heat to the outside atmosphere through the second cooling tower 32, and the flow rate in the loop is regulated and controlled by the second regulating water pump group 33. Specifically, the second heat exchange loop 3 also includes a second hot water storage tank 34 connected in parallel to the second cooling tower 32, used to store the higher-temperature cooling water after the second plate heat exchanger 31 has exchanged heat with the second cooling loop 5. The second hot water storage tank 34 is also connected to the first waste heat utilization loop 6 in parallel with the first hot water storage tank 24, forming an additional heat exchange path independent of the second heat exchange loop 3 and the second plate heat exchanger 31, allowing the heat from the higher-temperature cooling water in the second hot water storage tank 34 to be transferred through the first waste heat utilization loop 6.

[0042] Preferably, the first regulating pump group 23 and the second regulating pump group 33 each include two regulating pumps connected in parallel to provide additional control flux range and backup redundancy.

[0043] Preferably, two circulating water pumps are installed in the first cooling circuit 4 and the second cooling circuit 5 respectively, and one is used and the other is on standby to ensure the cooling water for critical equipment.

[0044] Preferably, the first waste heat utilization circuit 6 provides heat to the heating system 81 or other waste heat utilization systems as needed. That is, by applying the cooling system of the present invention, the waste heat generated by heat-generating components such as the hydrogen production system 71, DC converter 72, and fuel cell system 73 can be uniformly recovered and reused.

[0045] Preferably, the first waste heat utilization circuit 6 is also connected to a second constant pressure water supply subsystem 61, which uses tap water (not pure water) to perform constant pressure water supply operation on the first waste heat utilization circuit 6. Preferably, the second constant pressure water supply subsystem 61 can also use two or more water supply pumps to provide backup redundancy.

[0046] Another part of the temperature control system of the present invention includes a first constant-pressure water supply subsystem 1, used for constant-pressure water supply to the first cooling circuit 4 and the second cooling circuit 5. For example... Figure 2 The diagram shown is a schematic representation of the specific structure of the first constant-pressure water supply subsystem 1 in a preferred embodiment of the temperature control system of the present invention. It includes a demineralized water tank 11, a first water supply pump group 12, a first constant-pressure tank assembly 13, and a second constant-pressure tank assembly 14. To address the high water quality requirements of the cooling equipment, the demineralized water tank 11 is connected to a pure water system and receives and stores pure water (demineralized water). The first water supply pump group 12 includes at least a first water supply pump 121 and a second water supply pump 122 connected in parallel. Under normal operating conditions, the first water supply pump 121 and the second water supply pump 122 can be configured to connect to the first constant-pressure tank assembly 13 and the second constant-pressure tank assembly 14 respectively, and respectively perform constant-pressure water supply operations for the first cooling circuit 4 and the second cooling circuit 5. Meanwhile, the outlets of the first and second replenishment pumps 121 and 122, which are connected in parallel, can be connected by a closable control valve, thereby enabling a cross-standby operation of the first and second replenishment pumps 121 and 122. If either replenishment pump fails, the other replenishment pump can be activated by opening the control valve to perform constant pressure replenishment. Preferably, the first replenishment pump group 12 may also include a third replenishment pump 123 connected in parallel, and connected to the outlets of the first and second replenishment pumps 121 and 122 respectively through at least one closable control valve, so that even if either replenishment pump fails, constant pressure replenishment can still be performed on the first cooling circuit 4 and the second cooling circuit 5 respectively.

[0047] It is easy to understand that each node in the relevant loop of the above temperature control system can be equipped with valves, sensors, etc. as needed, and appropriate specifications of pipes can be selected to establish the loop. PLC control cabinets can be used to output control signals and supply power to the necessary functional operation components, and set the operating parameters of each component. All of these are configurations that can be made by those skilled in the art according to the actual application.

[0048] For example, taking a specific hydrogen energy storage power station A as an example, this power station A includes two 120kW fuel cell power generation devices, two 40Nm / h PEM water electrolysis hydrogen production devices, four electrical converters, and a hydrogen compressor as the main cooling equipment. For the waste heat temperature matching and equipment layout of this hydrogen energy storage power station, a first heat exchange loop 2 and a second heat exchange loop 3, along with corresponding first cooling loop 4 and second cooling loop 5, are used for cooling. The first cooling tower 22 can preferably be a mechanical ventilation cooling tower, with inlet / outlet temperatures preferably set at 40℃ / 32℃; the second cooling tower 32 can preferably be an industrial counter-flow cooling tower, with inlet / outlet temperatures preferably set at 60℃ / 35℃. The heating system is for recovering and utilizing the heat from the equipment cooling water. After passing through a water-to-water heat exchanger, the heat can be supplied to the office area or other heat users. The return water is sent back to the water-to-water heat exchanger via a heating circulation pump. The heating circulation system is equipped with two heating circulation pumps, operating in a one-in-use, one-on-standby mode.

[0049] Temperature sensors are installed at the inlet and outlet of the first plate heat exchanger 21, the inlet and outlet of the first hot water storage tank 24, the inlet of the first cooling tower 22, and the outlet of the first cooling tower 22. The alarm range of the temperature sensors is set on the host computer. The temperature of the external circulating water (first cooling circuit 4) of the hydrogen production system 71 and the DC converter 72 adopts feedforward + feedback control. The total power signal of the hydrogen production system 71 and the DC converter 72 is used as the input signal for feedforward control to adjust the frequency of the circulating pump. The delay time and frequency setpoint are determined through debugging. When the flow rate is higher than the upper limit or lower than the lower limit, the flow rate of the first regulating water pump group 23 is controlled by the PID dynamic adjustment program to achieve the purpose of temperature control. Temperature auxiliary adjustment is performed by controlling the inlet valve of the first hot water storage tank 24 and the circuit valve of the first cooling tower 22. The cooling water of the hydrogen production system 71 and the DC converter 72 is pressure controlled by the cooling water circulating pump.

[0050] Temperature sensors are installed at the inlet and outlet of the second plate heat exchanger 31 and the inlet and outlet of the second hot water storage tank 34. The alarm range of the temperature sensors is set on the host computer. The temperature of the external circulating water (second cooling circuit 5) of the fuel cell system 73 adopts feedforward + feedback control. The power signal of the fuel cell system 73 is used as the input signal for feedforward control to adjust the frequency of the circulating pump. The delay time and frequency setpoint are determined through debugging. When the temperature is higher than the upper limit or lower than the lower limit, the flow rate of the second regulating water pump group 33 is controlled by the PID dynamic adjustment program to achieve the purpose of temperature control. Temperature auxiliary adjustment is performed by adjusting the inlet valve of the second hot water storage tank 34 and the inlet valve of the second cooling tower 32.

[0051] When using the above-mentioned temperature control system to cool a hydrogen energy storage power station, the following steps may be performed independently or in combination:

[0052] A1. Determine whether the outlet temperature of the first plate heat exchanger 21 connected to the first cooling circuit 4 exceeds the first preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger 21 connected to the first cooling circuit 4 exceeds the first preset threshold range, increase or decrease the flow rate of the first regulating water pump group 23 accordingly.

[0053] A2. Determine whether the outlet temperature of the second plate heat exchanger 31 connected to the second cooling circuit 5 exceeds the second preset threshold range. When it is determined that the outlet temperature of the second plate heat exchanger 31 connected to the second cooling circuit 5 exceeds the second preset threshold range, increase or decrease the flow rate of the second regulating water pump group 33 accordingly.

[0054] A3. Determine whether the outlet temperature of the first plate heat exchanger 21 in the first heat exchange circuit 2 exceeds the third preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger 21 in the first heat exchange circuit 2 exceeds the third preset threshold range, open the electric valve of the first cooling tower 22.

[0055] A4. Determine whether the valve of the second hot water storage tank 34 is open. If it is determined that the valve of the second hot water storage tank 34 is not open, open the electric valve of the second cooling tower 32. If it is determined that the valve of the second hot water storage tank 34 is open, further determine whether the outlet temperature of the second plate heat exchanger 31 of the second heat exchange circuit 3 exceeds the fourth preset threshold range. If it is determined that the outlet temperature of the second plate heat exchanger 31 of the second heat exchange circuit 3 exceeds the fourth preset threshold range, open the electric valve of the second cooling tower 32.

[0056] A5. Determine whether the pressure after the water pump of the first cooling circuit 4 exceeds the fifth preset threshold range. When the pressure after the water pump of the first cooling circuit 4 exceeds the fifth preset threshold range, increase or decrease the water pump flow rate of the first cooling circuit 4 accordingly.

[0057] B1. Determine whether the outlet temperature of the first plate heat exchanger 21 in the first heat exchange circuit 2 exceeds the sixth preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger 21 in the first heat exchange circuit 2 does not exceed the sixth preset threshold range, open the valve of the first hot water storage tank 24.

[0058] B2. Determine whether the temperature of the second hot water storage tank 34 in the second heat exchange circuit 3 exceeds the seventh preset threshold range. When it is determined that the temperature of the second hot water storage tank 34 in the second heat exchange circuit 3 does not exceed the seventh preset threshold range, open the valve of the second hot water storage tank 34. Preferably, the temperature of the second hot water storage tank 34 corresponds to the feedback data from a temperature sensor installed inside the second hot water storage tank 34.

[0059] The above preset threshold ranges can be preset according to actual needs and can be changed according to the equipment operation.

[0060] In the specific embodiment of the hydrogen energy storage power station A described above, the preferred first preset threshold range can be set to 30 to 34°C; the second preset threshold range can be set to 43 to 47°C; the third preset threshold range can be set to 35 to 40°C; the fourth preset threshold range can be set to 43 to 45°C; the fifth preset threshold range can be set to 0.35 to 0.4 MPa; the sixth preset threshold range can be set to 35 to 42°C; and the seventh preset threshold range can be set to 53 to 57°C.

[0061] In practical applications, a control cabinet containing a PLC and a computer can be configured as the control terminal. Specific software can be used to control startup and shutdown, modify all operating settings and alarm interlock settings, and view all alarm information, the operating status of all valves and pumps, and all sensor parameters. Communication between the human-machine interface software and the PLC can be achieved using Modbus TCP; and Modbus TCP communication can also be used for startup, shutdown, and setpoint signals (all data exchanges) with the hydrogen energy station control system.

[0062] Before the hydrogen production system 71, fuel cell power generation system, and DC converter 72 are started, the temperature control system must be turned on first. The temperature control system can be turned on when all of the following conditions are met:

[0063] a. The water level in tank 61 of the second constant pressure water supply subsystem is normal;

[0064] b. The variable frequency pump in the temperature control system has no fault alarm signal;

[0065] c. Temperature control system: The control system is in automatic operation mode;

[0066] d. The first constant pressure water supply subsystem 1 is in a fault-free operating state. When the temperature control system is in operation, the first constant pressure water supply subsystem 1 is turned on, the DC loop circulating pump is in operation, and the DC cooling loop pure water pump is in operation.

[0067] When the temperature control system receives a station-wide shutdown signal from the centralized control system, it executes the shutdown procedure. The centralized control SCADA system adds a start / stop point for the temperature control system.

[0068] When the temperature control system malfunctions, a fault alarm signal is sent to the hydrogen energy station control system. When a fault is received in the pure water machine or the closed-loop cooling water replenishment and constant pressure system, a fault alarm signal should be sent to the hydrogen energy station control system. When the DC converter deionization equipment malfunctions, a fault alarm signal is sent to the four DC heat exchangers, and the DC converter deionization equipment sends a conductivity monitoring alarm signal to the DC converter.

[0069] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A temperature control system for a hydrogen energy storage power station that comprehensively utilizes waste heat, characterized in that, It includes a first constant-pressure water supply subsystem and a first heat exchange loop and a second heat exchange loop respectively connected to the first constant-pressure water supply subsystem; The first constant pressure water supply subsystem includes a demineralized water tank, a first water supply pump group, a first constant pressure tank assembly, and a second constant pressure tank assembly. The demineralized water tank is connected to the pure water system and receives and stores pure water. The first water supply pump group includes at least a first water supply pump and a second water supply pump connected in parallel. The first water supply pump is connected to the first constant pressure tank assembly, and the second water supply pump is connected to the second constant pressure tank assembly. The outlets of the first water supply pump and the second water supply pump are connected through at least one closable control valve. The first heat exchange circuit includes a first plate heat exchanger, a first cooling tower and a first regulating water pump group connected in sequence, and also includes a first hot water storage tank connected in parallel with the first cooling tower. The first plate heat exchanger is connected to the hydrogen production system and the DC converter through the first cooling circuit and performs temperature control on the hydrogen production system and the DC converter by exchanging heat with the first cooling circuit through the first heat exchange circuit. The second heat exchange circuit includes a second plate heat exchanger, a second cooling tower, and a second regulating water pump group connected in sequence, and also includes a second hot water storage tank connected in parallel with the second cooling tower. The second plate heat exchanger is connected to the fuel cell system through the second cooling circuit and exchanges heat with the second cooling circuit to control the temperature of the fuel cell system. The first hot water storage tank and the second hot water storage tank are connected in parallel to the first waste heat utilization circuit and exchange heat with the first waste heat utilization circuit through the first heat exchange circuit and the second heat exchange circuit to provide heat to the heating system; The first pressure tank assembly is connected to the first cooling circuit, and the second pressure tank assembly is connected to the second cooling circuit.

2. The temperature control system as described in claim 1, characterized in that, The first water replenishment pump group also includes a third water replenishment pump, which is connected in parallel with the first and second water replenishment pumps. The outlets of the third water replenishment pump, the first water replenishment pump, and the second water replenishment pump are respectively connected through at least one closable control valve.

3. The temperature control system as described in claim 1, characterized in that, The first heat exchange circuit also includes a cooling branch circuit connected in parallel to the first plate heat exchanger, the cooling branch circuit being connected to and cooling the hydrogen storage system.

4. The temperature control system as described in claim 1, characterized in that, It also includes a second constant-pressure water supply subsystem connected to the first waste heat utilization circuit, and the second constant-pressure water supply subsystem is connected to the tap water system.

5. The temperature control system as described in claim 1, characterized in that, The first regulating water pump group and the second regulating water pump group each include two regulating water pumps connected in parallel.

6. A temperature control method for a hydrogen energy storage power station, characterized in that, Temperature control of a hydrogen energy storage power station is performed using the temperature control system described in any one of claims 1 to 5. This includes performing one or more of the following steps synchronously or asynchronously: A1. Determine whether the outlet temperature of the first plate heat exchanger connected to the first cooling circuit exceeds the first preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger connected to the first cooling circuit exceeds the first preset threshold range, increase or decrease the flow rate of the first regulating water pump group accordingly. A2. Determine whether the outlet temperature of the second plate heat exchanger connected to the second cooling circuit exceeds the second preset threshold range. When it is determined that the outlet temperature of the second plate heat exchanger connected to the second cooling circuit exceeds the second preset threshold range, increase or decrease the flow rate of the second regulating water pump group accordingly. A3. Determine whether the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the third preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the third preset threshold range, open the electric valve of the first cooling tower. A4. Determine whether the outlet temperature of the second plate heat exchanger in the second heat exchange circuit exceeds the fourth preset threshold range. When it is determined that the outlet temperature of the second plate heat exchanger in the second heat exchange circuit exceeds the fourth preset threshold range, open the electric valve of the second cooling tower. A5. Determine whether the pressure after the water pump in the first cooling circuit exceeds the fifth preset threshold range. When the pressure after the water pump in the first cooling circuit exceeds the fifth preset threshold range, increase or decrease the water pump flow rate of the first cooling circuit accordingly.

7. The temperature control method as described in claim 6, characterized in that, It also includes performing one or more of the following steps synchronously or asynchronously: B1. Determine whether the outlet temperature of the first plate heat exchanger in the first heat exchange circuit exceeds the sixth preset threshold range. When it is determined that the outlet temperature of the first plate heat exchanger in the first heat exchange circuit does not exceed the sixth preset threshold range, open the valve of the first hot water storage tank. B2. Determine whether the temperature of the second hot water storage tank in the second heat exchange circuit exceeds the seventh preset threshold range. When it is determined that the temperature of the second hot water storage tank in the second heat exchange circuit does not exceed the seventh preset threshold range, open the valve of the second hot water storage tank.

8. The temperature control method as described in claim 7, characterized in that, Step A3 further includes determining whether the valve of the first hot water storage tank is open. When it is determined that the valve of the first hot water storage tank is not open, the electric valve of the first cooling tower is opened. When it is determined that the valve of the first hot water storage tank is open, it is further determined whether the outlet temperature of the first plate heat exchanger of the first heat exchange circuit exceeds the third preset threshold range. Step A4 further includes determining whether the valve of the second hot water storage tank is open. If the valve of the second hot water storage tank is not open, the electric valve of the second cooling tower is opened. If the valve of the second hot water storage tank is open, the outlet temperature of the second plate heat exchanger of the second heat exchange circuit is further determined to be within the range of the fourth preset threshold.

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