A temperature control system for a fuel cell test bench

Abstract

The present invention relates to the field of fuel cell technology, and in particular to a fuel cell test bench temperature control system. The fuel cell has a cooling water inlet and a cooling water outlet. The system includes a heat exchanger connected to the cooling water inlet and the cooling water outlet. The heat exchanger has a cold side water path. A regulating valve is connected to the cold side water path. A proportional valve is connected in parallel to the regulating valve. The adjustable range of the Kv value of the flow coefficient of the regulating valve and the proportional valve in parallel is 0.08m 3 / h‑28m 3 / h; The present invention adds a proportional valve, which has higher control accuracy. Under low power conditions, the refrigerant flow is controlled to stabilize the water temperature, and the steady-state control accuracy can be achieved to ±1°C, and the adjustable range of Kv value is 0.08m 3 / h, which can control the power to a minimum of 30kW; and through the regulating valve, the adjustment ratio can be larger, thereby controlling the refrigerant flow under high-power conditions, and then controlling the heat exchange of the heat exchanger to meet high-power regulation.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, and in particular to a temperature control system for a fuel cell test bench. Background Art

[0002] As a new energy technology, proton exchange membrane fuel cells are increasingly widely used, and fuel cell engines are developing towards high power and high power density. At present, the test power of the fuel cell system test bench used for supporting engine testing is around 200kW, and the test power compatibility range is mostly between 50kW-200kW. There are few or even no test benches outside this range, which poses great obstacles and uncertainties to the future development of high-power fuel cells. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fuel cell test bench temperature control system which can be applied to test fuel cells with a power between 30kW and 350kW.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A fuel cell test bench temperature control system, the fuel cell has a cooling water inlet and a cooling water outlet, the system includes a heat exchanger connected to the cooling water inlet and the cooling water outlet, the heat exchanger has a cold side water path, the cold side water path is connected to a regulating valve, the regulating valve is connected in parallel with a proportional valve; the Kv value of the flow coefficient of the regulating valve and the proportional valve after being connected in parallel is adjustable within a range of 0.08m 3 / h-28m 3 / h.

[0006] The beneficial effect of the present invention is that by adding a proportional valve, the proportional valve has higher control accuracy, and the refrigerant flow is controlled under low power conditions, thereby controlling the heat exchange of the heat exchanger, and then stabilizing the water temperature entering the fuel cell engine. The steady-state control accuracy of the cooling water temperature entering the fuel cell engine can be achieved to ±1°C, and the adjustable range of the Kv value is 0.08m 3 / h, which can control the engine power to a minimum of 30kW; and through the regulating valve, the adjustment ratio can be larger, thereby controlling the refrigerant flow rate under high-power conditions, and then controlling the heat exchange of the heat exchanger to meet high-power regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of a temperature control system for a fuel cell test bench according to a specific embodiment of the present invention;

[0008] Explanation of reference numerals: 1. fuel cell; 2. first angle seat valve; 3. filter; 4. conductivity sensor; 5. heat exchanger; 6. water level sensor; 7. second angle seat valve; 8. proportional valve; 9. regulating valve; 10. first water discharge solenoid valve; 11. second water discharge solenoid valve; T1. first temperature sensor; T2. second temperature sensor; T3. third temperature sensor; P1. first pressure sensor; P2. second pressure sensor. DETAILED DESCRIPTION

[0009] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0010] Please refer to Figure 1 A temperature control system for a fuel cell 1 test bench, wherein the fuel cell 1 has a cooling water inlet and a cooling water outlet, wherein the system comprises a heat exchanger 5 connected to the cooling water inlet and the cooling water outlet, wherein the heat exchanger 5 has a cold side water path, wherein a regulating valve 9 is connected to the cold side water path, wherein a proportional valve 8 is connected in parallel to the regulating valve 9; wherein the adjustable range of the flow coefficient Kv of the regulating valve 9 and the proportional valve 8 after being connected in parallel is 0.08m 3 / h-28m 3 / h.

[0011] From the above description, it can be seen that by adding a proportional valve 8, due to the higher control accuracy of the proportional valve 8, the refrigerant flow rate is controlled under low power conditions, and then the heat exchange of the heat exchanger 5 is controlled, and then the water temperature entering the fuel cell 1 engine is stabilized. The steady-state control accuracy of the cooling water temperature entering the fuel cell 1 engine can be achieved to ±1°C, and the adjustable range of the Kv value is 0.08m 3 / h, the engine power can be controlled to a minimum of 30kW; and through the regulating valve 9, a larger adjustment ratio can be achieved, thereby controlling the refrigerant flow rate under high-power conditions, and then controlling the heat exchange capacity of the heat exchanger 5 to meet high-power regulation.

[0012] Furthermore, the cold side water circuit uses a cold side external coolant with a temperature of 10°C-20°C and a pressure of 0.25 barg-0.45 barg as a refrigerant for heat exchange.

[0013] From the above description, it can be seen that by using the cold side external coolant with a temperature of 10℃-20℃ and a pressure of 0.25barg-0.45barg as the refrigerant for heat exchange, it is possible to ensure that the heat exchange capacity of 30kW-350kW is adjusted. The design of the regulating valve 9 in parallel with the proportional valve 8 is adopted, and the large-scale circulation system on the cold side ensures the heat exchange capacity of 30kW-350kW.

[0014] Furthermore, the system also includes a first angle seat valve 2, a filter 3, a conductivity sensor 4, a water level sensor 6 and a second angle seat valve 7. The first angle seat valve 2 is connected to the cooling water outlet and is sequentially connected to the filter 3, the conductivity sensor 4, the heat exchanger 5, the water level sensor 6, the second angle seat valve 7 and the cooling water inlet.

[0015] From the above description, it can be seen that the water flow sensor is used to detect the flow value of cooling water entering the fuel cell 1 engine in the temperature control system; the conductivity sensor 4 is used to detect the conductivity value of cooling water entering the fuel cell 1 engine in the temperature control system; and the filter 3 is used to filter solid particles and other impurities in the cooling water entering the fuel cell 1 engine in the temperature control system.

[0016] Furthermore, the filter 3 is a Y-type filter 3 .

[0017] Furthermore, a first drain solenoid valve 10 is provided between the cooling water outlet and the first angle seat valve 2 , and a second drain solenoid valve 11 is provided between the cooling water inlet and the second angle seat valve 7 .

[0018] It can be seen from the above description that the first water discharge solenoid valve 10 and the second water discharge solenoid valve 11 can be used to conveniently discharge water and realize temperature control.

[0019] Furthermore, a first temperature sensor T1 and a first pressure sensor P1 are provided at the cooling water inlet, a second temperature sensor T2 and a second pressure sensor P2 are provided at the cooling water outlet, and a third temperature sensor T3 is provided between the heat exchanger 5 and the conductivity sensor 4 .

[0020] Furthermore, the temperature control system also includes an electronic control system, and the first temperature sensor T1, the first pressure sensor P1, the second temperature sensor T2, the second pressure sensor P2, the third temperature sensor T3, the first water drain solenoid valve 10, the second water drain solenoid valve 11, the first angle seat valve 2, the filter 3, the conductivity sensor 4, the water volume sensor 6, the second angle seat valve 7, the regulating valve 9, and the proportional valve 8 are electrically connected to the electronic control system, and the electronic control system controls the operation of the temperature control system of the fuel cell 1 test bench.

[0021] Furthermore, the heat exchanger 5 is a plate-fin heat exchanger 5 using a vacuum brazing process.

[0022] From the above description, it can be known that by adopting the plate-fin heat exchanger 5 using the vacuum brazing process, it is possible to ensure that the requirement of low ion precipitation of the cooling water after entering the plate heat exchanger is ≤5us / cm.

[0023] Furthermore, the regulating valve 9 is a pneumatic regulating valve 9 , and the proportional valve 8 is an electric proportional valve 8 .

[0024] Furthermore, the flow coefficient Kv value of the regulating valve 9 is 0.56m 3 / h-28m 3 / h, the Kv value of the circulation system of the proportional valve 8 is 0.08m 3 / h-8m 3 / h.

[0025] Embodiment 1

[0026] A fuel cell test bench temperature control system, the fuel cell has a cooling water inlet and a cooling water outlet, characterized in that the system includes a heat exchanger connected to the cooling water inlet and the cooling water outlet, the heat exchanger has a cold side water path, the cold side water path is connected with a regulating valve, the regulating valve is connected in parallel with a proportional valve; the adjustable range of the flow coefficient of the regulating valve and the proportional valve after parallel connection is 0.08m 3 / h-28m 3 / h.

[0027] The cold side water circuit uses a cold side external coolant with a temperature of 10°C-20°C and a pressure of 0.25 barg-0.45 barg as a refrigerant for heat exchange.

[0028] The system also includes a first (pneumatic) angle seat valve, a filter, a conductivity sensor, a water level sensor and a second (pneumatic) angle seat valve. The first angle seat valve is connected to the cooling water outlet and is sequentially connected to the filter, the conductivity sensor, the heat exchanger, the water level sensor, the second angle seat valve and the cooling water inlet.

[0029] The filter is a Y-type filter.

[0030] A first water discharge solenoid valve is arranged between the cooling water outlet and the first angle seat valve, and a second water discharge solenoid valve is arranged between the cooling water inlet and the second angle seat valve.

[0031] A first temperature sensor and a first pressure sensor are arranged at the cooling water inlet, a second temperature sensor and a second pressure sensor are arranged at the cooling water outlet, and a third temperature sensor is arranged between the heat exchanger and the conductivity sensor.

[0032] The temperature control system also includes an electronic control system, and the first temperature sensor, the first pressure sensor, the second temperature sensor, the second pressure sensor, the third temperature sensor, the first water drain solenoid valve, the second water drain solenoid valve, the first angle seat valve, the filter, the conductivity sensor, the water volume sensor, the second angle seat valve, the regulating valve, and the proportional valve are electrically connected to the electronic control system, and the electronic control system controls the operation of the temperature control system of the fuel cell test bench.

[0033] The heat exchanger is a plate-fin heat exchanger using a vacuum brazing process.

[0034] The regulating valve is a pneumatic regulating valve, and the proportional valve is an electric proportional valve.

[0035] The flow coefficient Kv value of the regulating valve is 0.56m 3 / h-28m 3 / h, the Kv value of the proportional valve circulation system is 0.08m 3 / h-8m 3 / h.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fuel cell test bench temperature control system, the fuel cell having a cooling water inlet and a cooling water outlet, characterized in that: The system includes a heat exchanger connected to a cooling water inlet and a cooling water outlet, the heat exchanger has a cold side water circuit, a regulating valve is connected to the cold side water circuit, and a proportional valve is connected in parallel to the regulating valve; in, The regulating valve is a pneumatic regulating valve, and the proportional valve is an electric proportional valve; The flow coefficient Kv value of the regulating valve is 0.56m 3 / h-28m 3 / h, the Kv value of the proportional valve circulation system is 0.08m 3 / h-8m 3 / h; The cold side water circuit uses the cold side external coolant with a temperature of 10°C-20°C and a pressure of 0.25barg-0.45barg as the refrigerant for heat exchange; Among them, the system also includes a first angle seat valve, a filter, a conductivity sensor, a water level sensor and a second angle seat valve. The first angle seat valve is connected to the cooling water outlet and is sequentially connected to the filter, the conductivity sensor, the heat exchanger, the water level sensor, the second angle seat valve and the cooling water inlet.

2. The fuel cell test bench temperature control system according to claim 1, characterized in that: The filter is a Y-type filter.

3. The fuel cell test bench temperature control system according to claim 2, characterized in that: A first water discharge solenoid valve is arranged between the cooling water outlet and the first angle seat valve, and a second water discharge solenoid valve is arranged between the cooling water inlet and the second angle seat valve.

4. The fuel cell test bench temperature control system according to claim 3, characterized in that: A first temperature sensor and a first pressure sensor are arranged at the cooling water inlet, a second temperature sensor and a second pressure sensor are arranged at the cooling water outlet, and a third temperature sensor is arranged between the heat exchanger and the conductivity sensor.

5. The fuel cell test bench temperature control system according to claim 4, characterized in that: The temperature control system also includes an electronic control system, and the first temperature sensor, the first pressure sensor, the second temperature sensor, the second pressure sensor, the third temperature sensor, the first water drain solenoid valve, the second water drain solenoid valve, the first angle seat valve, the filter, the conductivity sensor, the water volume sensor, the second angle seat valve, the regulating valve, and the proportional valve are electrically connected to the electronic control system, and the electronic control system controls the operation of the temperature control system of the fuel cell test bench.

6. The fuel cell test bench temperature control system according to any one of claims 1 to 5, characterized in that: The heat exchanger is a plate-fin heat exchanger using a vacuum brazing process.

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