A rapid detection device and detection method applicable to hydrogen-oxygen gas leakage

Abstract

The present invention discloses a rapid detection device and detection method applicable to hydrogen-oxygen gas leakage, including a hydrogen mass flow controller, a nitrogen mass flow controller, an air mass flow controller, a gas mixing tank, a CVM inspection device, a stop valve, and an electric stack to be tested. It is characterized in that: the electric stack to be tested is connected to the air mass flow controller through a pipeline, and the air mass flow controller is connected to an air gas source through a pipeline. A baffle is arranged inside the gas mixing tank. A gas mixing tank air inlet is arranged on the right side of the gas mixing tank, and a gas mixing tank air outlet is arranged on the left side of the gas mixing tank. The gas mixing tank air outlet is connected to a nitrogen gas source and a hydrogen gas source respectively through pipelines. The electric stack to be tested is connected to the gas mixing tank air outlet through a pipeline, and the electric stack to be tested is connected with an inspection wire harness; the present invention simplifies the detection process, can instantaneously perform hydrogen-oxygen gas leakage detection, improves the efficiency, and enhances the safety and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of stack gas penetration detection, and specifically to a rapid detection device and method applicable to hydrogen-oxygen gas penetration. Background Technique

[0002] The anode of a fuel cell stack uses hydrogen fuel, and the cathode oxidant is mostly air. If the proton exchange membrane in the stack is damaged or the stack sealing component fails, it will cause hydrogen-oxygen gas penetration in the stack. During operation, when the hydrogen-oxygen gas penetration reaches the explosion limit, safety accidents are likely to occur. Since the stack is composed of multiple single cells, during the assembly and operation stages of the stack, defects in raw materials or incorrect operating methods will cause hydrogen-oxygen gas penetration in the single cells, thus affecting the normal operation of the entire stack.

[0003] To eliminate this safety hazard, in the prior art, the gas penetration detection method for a fuel cell stack needs to be detected with the help of a test platform. The fuel cell stack is relatively large in volume and weight, and it is very difficult to connect to the test platform. There are many preparatory works before detection, and it takes a long time. The anode detection gas uses a mixture of hydrogen and inert gas, and the cathode detection gas often uses compressed air. During the detection process, a lower concentration of hydrogen is used, which can more quickly detect and locate the position of the single cell with hydrogen-oxygen gas penetration, and can reduce costs. However, hydrogen is accompanied by certain dangers when mixed with other gases, and it will cause relatively large interference to the detection results when the gas mixing effect is not ideal. Therefore, we propose a safe and efficient rapid detection device. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects, provide a rapid detection device and method applicable to hydrogen-oxygen gas penetration, simplify the detection process, can immediately detect hydrogen-oxygen gas penetration, improve the efficiency, enhance the safety and reliability, eliminate the interference caused by uneven gas mixing, accurately control the gas flow rate, improve the accuracy of the gas mixing composition, and can qualitatively analyze the severity of hydrogen-oxygen gas penetration in a single cell, and can effectively solve the problems in the background technique.

[0005] To achieve the above object, the present invention provides the following technical solutions: A rapid detection device and detection method for hydrogen-oxygen gas leakage, including a hydrogen mass flow controller, a nitrogen mass flow controller, an air mass flow controller, a gas mixing tank, a CVM inspection device, a stop valve, and a fuel cell stack to be tested, characterized in that: the fuel cell stack to be tested is connected to the air mass flow controller through a pipeline, and the air mass flow controller is connected to an air source through a pipeline. A baffle is arranged inside the gas mixing tank. A gas mixing tank air inlet is arranged on the right side of the gas mixing tank, and a gas mixing tank air outlet is arranged on the left side of the gas mixing tank. The gas mixing tank air outlet is connected to a nitrogen source and a hydrogen source through pipelines respectively. The fuel cell stack to be tested is connected to the gas mixing tank air outlet through a pipeline. The fuel cell stack to be tested is connected with an inspection wire harness, and the fuel cell stack to be tested is connected to the CVM inspection device through the inspection wire harness. The stop valve is connected to the fuel cell stack to be tested through a pipeline, and the fuel cell stack to be tested is provided with a hydrogen outlet.

[0006] Further, the baffle is arranged up and down inside the gas mixing tank, and there is gas flow between the baffles. Through the baffle inside the gas mixing tank, the uniformity of hydrogen mixing is ensured, and the interference caused by uneven mixing is eliminated.

[0007] Further, a detection method for a rapid detection device for hydrogen-oxygen gas leakage is characterized in that: it includes the following specific detection steps:

[0008] Step 1: Connect the fuel cell stack to be tested to the rapid detection device. The air source is connected to the air inlet of the fuel cell stack to be tested through the air mass flow controller. The nitrogen source and the hydrogen source are connected to the hydrogen inlet of the fuel cell stack to be tested through the gas mixing tank. The air outlet of the fuel cell stack to be tested is externally connected to a stop valve, and the hydrogen outlet of the fuel cell stack to be tested is externally connected to the outdoor atmosphere;

[0009] Step 2: Connect the CVM inspection device to the fuel cell stack to be tested through the inspection wire harness. Inspect one section at a time. Open the inspection detection page on the computer and record the data;

[0010] Step 3: Continuously introduce nitrogen and hydrogen at a flow ratio of 9:1. The gauge pressure at the hydrogen outlet of the fuel cell stack to be tested is 4 - 6 kPa, and air is continuously introduced at a flow rate of 100 L / min;

[0011] Step 4: When the open circuit voltage of each section of the fuel cell stack to be tested reaches above 0.9 V, stop introducing air and close the stop valve at the air outlet of the fuel cell stack to be tested, and record the voltage change of each section of the fuel cell stack to be tested within 1 minute;

[0012] Step 5: The position of the single cell with a rapid voltage drop in the fuel cell stack to be tested is the position of hydrogen-oxygen gas leakage.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The rapid detection device and detection method for hydrogen-oxygen gas leakage of the present invention have the following advantages:

[0014] 1. A gas mixing tank is provided in the present invention. Through the baffle inside the gas mixing tank, the uniformity of hydrogen gas mixing is ensured, and the interference caused by uneven gas mixing is eliminated.

[0015] 2. A hydrogen mass flow controller and a nitrogen mass flow controller are provided in the present invention. Through the hydrogen mass flow controller and the nitrogen mass flow controller, the gas flow can be accurately controlled, the accuracy of the gas mixing components is improved, and the severity of hydrogen-oxygen cross-leakage in a single cell can be qualitatively analyzed.

[0016] 3. The present invention simplifies the detection process, can perform hydrogen-oxygen cross-leakage detection immediately, improves the efficiency, and enhances the safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of the gas mixing tank of the present invention;

[0019] Figure 3 is a voltage detection diagram of a 30-cell fuel cell stack of the present invention;

[0020] Figure 4 is a voltage detection diagram of a 220-cell fuel cell stack of the present invention.

[0021] In the figure: 1 air gas source, 2 nitrogen gas source, 3 hydrogen gas source, 4 hydrogen mass flow controller, 5 nitrogen mass flow controller, 6 gas mixing tank, 7 hydrogen outlet, 8 cut-off valve, 9 fuel cell stack to be tested, 10 inspection harness, 11 CVM inspection equipment, 12 air mass flow controller, 13 gas mixing tank inlet, 14 baffle, 15 gas mixing tank outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1

[0024] Please refer to Figures 1-4, the present invention provides a technical solution: a rapid detection device and detection method applicable to hydrogen-oxygen gas leakage, including a hydrogen mass flow controller 4, a nitrogen mass flow controller 5, an air mass flow controller 12, a gas mixing tank 6, a CVM inspection device 11, a stop valve 8, and a fuel cell stack under test 9, characterized in that: the fuel cell stack under test 9 is connected to the air mass flow controller 12 through a pipeline, the air mass flow controller 12 is connected to an air source 1 through a pipeline, a baffle 14 is arranged inside the gas mixing tank 6, the baffle 14 is arranged vertically inside the gas mixing tank 6, and there is gas flow between the baffles 14. Through the baffle 14 inside the gas mixing tank 6, the uniformity of hydrogen gas mixing is ensured, and the interference caused by uneven gas mixing is eliminated. An air inlet of the gas mixing tank 13 is arranged on the right side of the gas mixing tank 6, and an air outlet of the gas mixing tank 15 is arranged on the left side of the gas mixing tank 6. The air outlet 15 of the gas mixing tank is connected to a nitrogen source 2 and a hydrogen source 3 through pipelines respectively. The fuel cell stack under test 9 is connected to the air outlet 15 of the gas mixing tank through a pipeline. The fuel cell stack under test 9 is connected with an inspection wire harness 10, and the fuel cell stack under test 9 is connected to the CVM inspection device 11 through the inspection wire harness 10. The stop valve 8 is connected to the fuel cell stack under test 9 through a pipeline, and a hydrogen outlet 7 is arranged on the fuel cell stack under test 9.

[0025] Further, a detection method of a rapid detection device applicable to hydrogen-oxygen gas leakage is characterized in that: it includes the following specific detection steps:

[0026] Step 1: Connect 30 newly assembled fuel cell stacks under test 9 to the rapid detection device. The air source 1 is connected to the air inlet of the fuel cell stack under test 9 through the air mass flow controller 12. The nitrogen source 2 and the hydrogen source 3 are connected to the hydrogen inlet of the fuel cell stack under test 9 through the gas mixing tank 6. The air outlet of the fuel cell stack under test 9 is externally connected to the stop valve 8, and the hydrogen outlet 7 of the fuel cell stack under test 9 is externally connected to the outdoor atmosphere;

[0027] Step 2: Connect the CVM inspection device 11 to the fuel cell stack under test 9 through the inspection wire harness 10, inspect one by one, open the inspection detection page on the computer, and record the data;

[0028] Step 3: Continuously introduce nitrogen and hydrogen at a flow ratio of 9:1. The gauge pressure at the hydrogen outlet 7 of the fuel cell stack under test 9 is 5 kPa, and air is continuously introduced at a flow rate of 100 L / min;

[0029] Step 4: When the open-circuit voltage of each section of the fuel cell stack under test 9 reaches more than 0.9 V, stop introducing air, close the stop valve 8 at the air outlet of the fuel cell stack under test 9, and record the voltage change of each section of the fuel cell stack under test 9 within 1 minute;

[0030] Step 5: The position of the single cell with a rapid voltage drop in the fuel cell stack under test 9 is the position of hydrogen-oxygen gas leakage. Hydrogen-oxygen gas leakage exists in the 14th / 15th section, as Figure 3 shown.

[0031] Embodiment 2

[0032] Please refer to Figures 1-4 , the present invention provides a technical solution: a rapid detection device and detection method suitable for hydrogen-oxygen gas leakage, including a hydrogen mass flow controller 4, a nitrogen mass flow controller 5, an air mass flow controller 12, a gas mixing tank 6, a CVM inspection device 11, a stop valve 8, and a fuel cell stack to be tested 9, characterized in that: the fuel cell stack to be tested 9 is connected to the air mass flow controller 12 through a pipeline, the air mass flow controller 12 is connected to an air source 1 through a pipeline, a baffle 14 is arranged inside the gas mixing tank 6, the baffle 14 is arranged up and down inside the gas mixing tank 6, a gas flow is arranged between the baffles 14, and through the baffle 14 inside the gas mixing tank 6, the uniformity of hydrogen gas mixing is ensured, and the interference caused by uneven gas mixing is excluded. A gas mixing tank air inlet 13 is arranged on the right side of the gas mixing tank 6, a gas mixing tank air outlet 15 is arranged on the left side of the gas mixing tank 6, the gas mixing tank air outlet 15 is connected to a nitrogen gas source 2 and a hydrogen gas source 3 respectively through pipelines, the fuel cell stack to be tested 9 is connected to the gas mixing tank air outlet 15 through a pipeline, the fuel cell stack to be tested 9 is connected with an inspection wire harness 10, the fuel cell stack to be tested 9 is connected to the CVM inspection device 11 through the inspection wire harness 10, the stop valve 8 is connected to the fuel cell stack to be tested 9 through a pipeline, and a hydrogen gas outlet 7 is arranged on the fuel cell stack to be tested 9.

[0033] Further, a detection method of a rapid detection device suitable for hydrogen-oxygen gas leakage is characterized in that: it includes the following specific detection steps:

[0034] Step 1: Connect 220 fuel cell stacks 9 to be tested newly assembled to the rapid detection device. The air source 1 is connected to the air inlet of the fuel cell stack to be tested 9 through the air mass flow controller 12. The nitrogen gas source 2 and the hydrogen gas source 3 are connected to the hydrogen inlet of the fuel cell stack to be tested 9 through the gas mixing tank 6. The air outlet of the fuel cell stack to be tested 9 is externally connected to the stop valve 8, and the hydrogen gas outlet 7 of the fuel cell stack to be tested 9 is externally connected to the outdoor atmosphere;

[0035] Step 2: Connect the CVM inspection device 11 to the fuel cell stack to be tested 9 through the inspection wire harness 10, inspect one by one, open the inspection detection page on the computer, and record the data;

[0036] Step 3: Continuously introduce nitrogen and hydrogen according to a flow ratio of 9:1. The gauge pressure at the hydrogen gas outlet 7 of the fuel cell stack to be tested 9 is 6 kPa, and air is continuously introduced at a flow rate of 700 L / min;

[0037] Step 4: When the open circuit voltage of each section of the fuel cell stack to be tested 9 reaches more than 0.9 V, stop introducing air, close the stop valve 8 at the air outlet of the fuel cell stack to be tested 9, and record the voltage change of each section of the fuel cell stack to be tested 9 within 1 minute;

[0038] Step 5: The position of the single cell where the voltage in the fuel cell stack 9 to be measured drops rapidly is the position of hydrogen-oxygen cross-leakage. Hydrogen-oxygen cross-leakage exists in the 9th / 13th / 167th section, as Figure 4 shown.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection method for a rapid detection device applicable to hydrogen-oxygen gas leakage, characterized in that, Including a rapid detection device applicable to hydrogen-oxygen cross-leakage, the rapid detection device includes a hydrogen mass flow controller (4), a nitrogen mass flow controller (5), an air mass flow controller (12), a gas mixing tank (6), a CVM inspection device (11), a stop valve (8), and a fuel cell stack under test (9), and is characterized in that: the fuel cell stack under test (9) is connected to the air mass flow controller (12) through a pipeline, the air mass flow controller (12) is connected to an air source (1) through a pipeline, a baffle (14) is arranged inside the gas mixing tank (6), a gas mixing tank inlet (13) is arranged on the right side of the gas mixing tank (6), a gas mixing tank outlet (15) is arranged on the left side of the gas mixing tank (6), the gas mixing tank outlet (15) is connected to a nitrogen source (2) and a hydrogen source (3) through pipelines respectively, the fuel cell stack under test (9) is connected to the gas mixing tank outlet (15) through a pipeline, the fuel cell stack under test (9) is connected to an inspection wire harness (10), and the fuel cell stack under test (9) is connected to the CVM inspection device (11) through the inspection wire harness (10), the stop valve (8) is connected to the fuel cell stack under test (9) through a pipeline, and the fuel cell stack under test (9) is provided with a hydrogen outlet (7). The detection method includes the following specific detection steps: Step 1: Connect the fuel cell stack under test (9) to the rapid detection device. The air source (1) is connected to the air inlet of the fuel cell stack under test (9) through the air mass flow controller (12), the nitrogen source (2) and the hydrogen source (3) are connected to the hydrogen inlet of the fuel cell stack under test (9) through the gas mixing tank (6), the air outlet of the fuel cell stack under test (9) is externally connected to the stop valve (8), and the hydrogen outlet (7) of the fuel cell stack under test (9) is externally connected to the outdoor atmosphere; Step 2: Connect the CVM inspection device (11) to the fuel cell stack under test (9) through the inspection wire harness (10), inspect one by one, open the inspection detection page on the computer, and record the data; Step 3: Continuously introduce nitrogen and hydrogen at a flow ratio of 9:

1. The gauge pressure at the hydrogen outlet (7) of the fuel cell stack under test (9) is 4-6 kPa, and air is continuously introduced at a flow rate of 100 L / min; Step 4: When the open-circuit voltage of each section of the fuel cell stack under test (9) reaches more than 0.9 V, stop introducing air, close the stop valve (8) at the air outlet of the fuel cell stack under test (9), and record the voltage change of each section of the fuel cell stack under test (9) within 1 minute; Step 5: The position of the single cell with a rapid voltage drop in the fuel cell stack under test (9) is the position of hydrogen-oxygen cross-leakage.

2. The detection method for a rapid detection device applicable to hydrogen-oxygen gas leakage according to claim 1, characterized in that: The baffle (14) is arranged up and down inside the gas mixing tank (6), and gas flow is provided between the baffles (14).

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