A testing device and testing method for a fuel cell hydrogen circulation pump

Abstract

This invention discloses a test apparatus for a fuel cell hydrogen circulation pump, comprising a hydrogen source, a resistance simulator, a humidifier, and a hydrogen circulation pump. A pressure regulating valve and a shut-off valve are sequentially arranged between the hydrogen source and the resistance simulator. The output end of the resistance simulator is connected to the input end of the humidifier, and the output end of the humidifier is connected to the hydrogen circulation pump. A hygrometer, a pressure gauge, and a three-way valve are sequentially arranged along the airflow direction. A one-way shut-off valve is provided at the output end of the hydrogen circulation pump. This invention also discloses a test method for the fuel cell hydrogen circulation pump, which can test the test results of the hydrogen circulation pump under different operating conditions. The apparatus is simple and can directly test the output value of the hydrogen circulation pump under steady-state and dynamic conditions, examining the working capacity and response value of the hydrogen circulation pump under gas fluctuation conditions in the actual application environment of the fuel cell system.

Description

Technical Field

[0001] This invention relates to the field of hydrogen circulation pumps, and more particularly to a testing method and apparatus for a fuel cell hydrogen circulation pump. Background Technology

[0002] Pressure has a significant impact on fuel cell performance during operation. Increased fuel gas pressure increases the partial pressure of the reactant gas, gas solubility, and mass transfer rate, thereby improving cell performance. However, pressure fluctuations can also significantly affect fuel cell performance, most directly resulting in poor uniformity of individual fuel cell cells.

[0003] During the operation of a fuel cell engine system, a hydrogen recirculation pump is commonly used to transport hydrogen from the stack outlet to the stack inlet, thereby improving hydrogen utilization. However, in actual system operation, the high-speed operation of the recirculation pump causes fluctuations in its outlet pressure. These fluctuations affect the stability of the fuel cell stack inlet pressure, causing it to operate within an unstable range and impacting fuel cell performance. Summary of the Invention

[0004] The purpose of this invention is to provide a testing method and apparatus for a hydrogen circulation pump for a fuel cell, to accurately test various performance characteristics of the hydrogen circulation pump, and to determine whether the hydrogen circulation pump is consistent with the actual use of the fuel cell system.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A test device for a fuel cell hydrogen circulation pump includes a hydrogen source, a resistance simulator, a humidifier, and a hydrogen circulation pump. The hydrogen source is connected to the input of the resistance simulator via pipe I, and a pressure regulating valve and a shut-off valve I are sequentially installed on pipe I along the gas flow direction. The output of the resistance simulator is connected to the input of the humidifier. The output of the humidifier is connected to the input of the hydrogen circulation pump via pipe II, and a hygrometer I, a pressure gauge I, a three-way valve I, and a shut-off valve VI are sequentially installed on pipe II along the gas flow direction.

[0007] Along the gas flow direction, the output end of the hydrogen circulation pump is sequentially equipped with a one-way shut-off valve I, a mass flow meter, a pressure gauge II, a hygrometer II, and a shut-off valve IV;

[0008] The three-way valve I is connected to pressure gauge I at port a, and the three-way valve I is connected to shut-off valve VI at port b; port c of the three-way valve I is connected to the input end of the mass flow meter through a branch pipeline, and shut-off valve II and check valve II are sequentially installed on the branch pipeline along the gas flow direction.

[0009] The present invention is further configured such that: a three-way valve II is provided between the hygrometer II and the shut-off valve IV, the three-way valve II is connected to the hygrometer II at port a and the three-way valve II is connected to the shut-off valve IV at port b; the three-way valve II at port c is connected to the input end of the resistance simulator through pipeline III, and along the gas flow direction, the pipeline III is provided with a shut-off valve V, a pressure buffer tank and a one-way valve III in sequence.

[0010] A test method for a fuel cell hydrogen circulation pump includes the following steps:

[0011] Step 1: Open shut-off valve VI, close shut-off valves II, IV, and V, turn on the hydrogen source, adjust the pressure regulating valve, and open shut-off valve I to maintain pressure.

[0012] Step 2: Based on Step 1, adjust the hydrogen circulation pump to its maximum speed, record the values ​​of the mass flow meter, pressure gauge I, pressure gauge II, hygrometer I, and hygrometer II, and measure the maximum output gas pressure of the hydrogen circulation pump.

[0013] Step 3: Based on Step 2, open shut-off valve IV and record the values ​​of mass flow meter, pressure gauge I, pressure gauge II, hygrometer I, and hygrometer II as data 1;

[0014] Step 4: Based on Step 3, close shut-off valve VI, open shut-off valve II, keep the other valves in the same state as in Step 3, and after stabilization, record the values ​​of mass flow meter, pressure gauge I, pressure gauge II, hygrometer I, and hygrometer II as data 2.

[0015] Step 5: Compare data 1 and data 2 to measure the circulation efficiency of the hydrogen circulation pump.

[0016] The present invention is further configured as follows: Step 6: Based on step 3, close the shut-off valve IV, open the shut-off valve V, keep the other valve states of step 3 unchanged, record the values ​​of mass flow meter, pressure gauge I, pressure gauge II, hygrometer I, and hygrometer II, and measure the working performance of the hydrogen circulation pump.

[0017] The present invention is further configured such that the pressure value of the pressure regulating valve is 1-10 MPa.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. The present invention sets up a resistance simulator and a humidifier in the test device to simulate the operating environment of the fuel cell, simulate the pressure drop caused by the fuel cell reaction gas entering and leaving the fuel cell, and simulate the gas humidification. The device is simple and convenient, and the test is more scientific.

[0020] 2. This invention can more accurately determine the maximum working performance of the hydrogen circulation pump and its normal working effect when connected to a fuel cell by controlling and comparing the humidity and pressure values ​​of the gas output at the maximum speed of the hydrogen circulation pump, as well as the humidity and pressure values ​​of the gas output without the hydrogen circulation pump.

[0021] 3. By controlling and simulating gas fluctuations during fuel cell operation and normal loading, this invention can directly test the output value of the hydrogen circulation pump under steady-state and dynamic conditions, and examine the working capacity and response value of the hydrogen circulation pump under gas fluctuation conditions in the actual application environment of the fuel cell system.

[0022] 4. This invention adds a pressure buffer tank to the test system, connecting the gas output end of the hydrogen pump and the input end of the fuel cell, to accurately test the impact of fluctuating gas pressure caused by loading and unloading on the performance of the fuel cell during the actual application of the hydrogen circulation pump. Attached Figure Description

[0023] Figure 1 Schematic diagram of hydrogen circulation pump test device;

[0024] In the diagram: 1. Hydrogen source; 2. Pressure regulator; 3-1. Shut-off valve I; 3-2. Shut-off valve II; 3-3. Shut-off valve III; 3-4. Shut-off valve IV; 3-5. Shut-off valve V; 3-6. Shut-off valve VI; 4. Resistance simulator; 5. Humidifier; 6-1. Hygrometer I; 6-2. Hygrometer II; 7-1. Pressure gauge I; 7-2. Pressure gauge II; 8-1. Three-way valve I; 8-2. Three-way valve II; 9. Hydrogen circulation pump; 10-1. Check valve I; 10-2. Check valve II; 10-3. Check valve III; 11. Mass flow meter; 12. Pressure buffer tank; 13. Hydrogen circulation pump tailpipe. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Example

[0027] A test device for a hydrogen circulation pump for a fuel cell includes a hydrogen source 1, a resistance simulator 4, a humidifier 5, and a hydrogen circulation pump 9. The hydrogen source 1 is connected to the input end of the resistance simulator 4 through a pipeline I. Along the gas flow direction, a pressure regulating valve 2 and a shut-off valve I3-1 are sequentially installed on the pipeline I. The output end of the resistance simulator 4 is connected to the input end of the humidifier 5 to simulate the operating conditions of a fuel cell. The output of humidifier 5 is connected to the input of hydrogen circulation pump 9 via pipe II. Along the gas flow direction, pipe II is equipped with hygrometer I6-1, pressure gauge I7-1, three-way valve I8-1, and shut-off valve VI3-6 in sequence. Along the gas flow direction, the output of hydrogen circulation pump is equipped with check valve I10-1, mass flow meter 11, pressure gauge II7-2, hygrometer II6-2, three-way valve II8-2, and shut-off valve IV3-4 in sequence. Three-way valve I8-1 is connected to pressure gauge I7-1 at port a, and three-way valve I8-1 is connected to shut-off valve VI3-6 at port b. Port c of three-way valve I8-1 is connected to the input of mass flow meter 11 via a branch pipe. Along the gas flow direction, the branch pipe is equipped with shut-off valve II3-2 and check valve II10-2 in sequence.

[0028] Three-way valve II8-2 is connected to hygrometer II6-2 at port a, and three-way valve II8-2 is connected to shut-off valve IV3-4 at port b; port c of three-way valve II8-2 is connected to the input end of resistance simulator 4 through pipeline III. Along the gas flow direction, shut-off valve V3-5, pressure buffer tank 12, and one-way valve III10-3 are installed in sequence on pipeline III to realize the dry gas return of hydrogen circulation pump.

[0029] The test method for the above-mentioned fuel cell hydrogen circulation pump:

[0030] Step 1: Open shut-off valve VI3-6, close shut-off valves II3-2, IV3-4, and V3-5, open hydrogen source 1, adjust the pressure of pressure regulator valve 2 to 5MPa, and open shut-off valve I3-1 so that hydrogen can pass normally through hydrogen circulation pump 9. However, because shut-off valves II3-2, IV3-4, and V3-5 are closed, the hydrogen is pressure maintained after passing through hydrogen circulation pump 9.

[0031] Step 2: Based on Step 1, adjust the hydrogen circulation pump 9 to its maximum operating speed. After stabilizing for 10 minutes, the parameter values ​​of pressure gauge II7-2 and hygrometer II6-2 can be read, and the maximum output gas pressure of hydrogen circulation pump 9 can be measured.

[0032] Step 3: Based on Step 2, open the shut-off valve IV3-4, keep the pressure regulating valve 2 unchanged, the pressure 5MPa, and the hydrogen circulation pump 9 at maximum speed. Read the values ​​of mass flow meter 11, pressure gauge I7-1, pressure gauge II7-2, hygrometer I6-1, and hygrometer II6-2 respectively. Directly measure the change in gas parameters after the action of hydrogen circulation pump 9, and use it as data 1.

[0033] Step 4: Based on Step 3, close shut-off valve VI3-6 and open shut-off valve II3-2. Keep the other valves in the same state as in Step 3. After stabilization, read the values ​​of mass flow meter 11, pressure gauge I7-1, pressure gauge II7-2, hygrometer I6-1, and hygrometer II6-2 as data 2. Compare data 1 and data 2 to measure the circulation efficiency of hydrogen circulation pump 9.

[0034] Step 5: Based on Step 3, close the shut-off valve IV3-4 and open the shut-off valve V3-5. Keep the other valves in the same state as in Step 3. After stabilization, read the values ​​of mass flow meter 11, pressure gauge I7-1, pressure gauge II7-2, hygrometer I6-1, and hygrometer II6-2. At this time, the working performance of the hydrogen circulation pump can be accurately tested during the actual operation of the fuel cell.

[0035] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A test device for a fuel cell hydrogen circulation pump, characterized by, The device includes a hydrogen source (1), a resistance simulator (4), a humidifier (5), and a hydrogen circulation pump (9); The hydrogen source (1) is connected to the input end of the resistance simulator (4) through pipe I. Along the gas flow direction, pipe I is provided with a pressure regulating valve (2) and a shut-off valve I (3-1) in sequence. The output end of the resistance simulator (4) is connected to the input end of the humidifier (5). The output end of the humidifier (5) is connected to the input end of the hydrogen circulation pump (9) through pipe II. Along the gas flow direction, pipe II is provided with a hygrometer I (6-1), a pressure gauge I (7-1), a three-way valve I (8-1), and a shut-off valve VI (3-6) in sequence. Along the gas flow direction, the output end of the hydrogen circulation pump is sequentially equipped with a one-way valve I (10-1), a mass flow meter (11), a pressure gauge II (7-2), a hygrometer II (6-2), and a shut-off valve IV (3-4); The three-way valve I (8-1) is connected to pressure gauge I (7-1) at port a, and the three-way valve I (8-1) is connected to shut-off valve VI (3-6) at port b; port c of the three-way valve I (8-1) is connected to the input end of mass flow meter (11) through a branch pipeline. Along the gas flow direction, shut-off valve II (3-2) and check valve II (10-2) are sequentially provided on the branch pipeline.

2. The test device for a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: A three-way valve II (8-2) is provided between the hygrometer II (6-2) and the shut-off valve IV (3-4). The three-way valve II (8-2) is connected to the hygrometer II (6-2) at port a and to the shut-off valve IV (3-4) at port b. The port c of the three-way valve II (8-2) is connected to the input end of the resistance simulator (4) through pipeline III. Along the gas flow direction, the pipeline III is provided with a shut-off valve V (3-5), a pressure buffer tank (12), and a one-way valve III (10-3) in sequence.

3. A test method for the test device of claim 2, characterized in that: The method includes the following steps: Step 1: Open shut-off valve VI (3-6), close shut-off valve II (3-2), shut-off valve IV (3-4), and shut-off valve V (3-5), open hydrogen source (1), adjust pressure regulating valve (2), and open shut-off valve I (3-1) to achieve pressure maintenance; Step 2: Based on Step 1, adjust the hydrogen circulation pump (9) to the maximum speed, record the values ​​of mass flow meter (11), pressure gauge I (7-1), pressure gauge II (7-2), hygrometer I (6-1), and hygrometer II (6-2), and measure the maximum output gas pressure of the hydrogen circulation pump (9). Step 3: Based on Step 2, open the shut-off valve IV (3-4) and record the values ​​of mass flow meter (11), pressure gauge I (7-1), pressure gauge II (7-2), hygrometer I (6-1), and hygrometer II (6-2) as data 1; Step 4: Based on Step 3, close shut-off valve VI (3-6), open shut-off valve II (3-2), keep the other valves in Step 3 unchanged, and after stabilization, record the values ​​of mass flow meter (11), pressure gauge I (7-1), pressure gauge II (7-2), hygrometer I (6-1), and hygrometer II (6-2) as data 2. Step 5: Compare data 1 and data 2 to measure the circulation efficiency of the hydrogen circulation pump (9).

4. The test method of claim 3, wherein: The method further includes the following steps: Step 6: Based on Step 3, close the shut-off valve IV (3-4), open the shut-off valve V (3-5), keep the other valves in Step 3 unchanged, record the values ​​of mass flow meter (11), pressure gauge I (7-1), pressure gauge II (7-2), hygrometer I (6-1), and hygrometer II (6-2), and measure the working performance of hydrogen circulation pump (9).

5. The test method of claim 3, wherein: The pressure value of the pressure regulating valve (2) is 1-10 MPa.

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