Alkaline electrolytic cell pressure test detection device and pressure test method

Abstract

The invention discloses a pressure test detection device and a pressure test method for an alkaline electrolytic bath, the device comprises a packaging grid gas group, a busbar group, a secondary pressure reducing valve and an electrolytic bath, the packaging grid gas group is provided with a plurality of gas cylinders, the gas cylinders are connected with primary pressure reducing valves, and the primary pressure reducing valves perform primary pressure reduction on gas ejected from the gas cylinders; the busbar set is connected with the first-stage pressure reducing valve, and a main pipeline is arranged at the end, away from the first-stage pressure reducing valve, of the busbar set. The secondary pressure reducing valve is used for performing secondary pressure reduction on the gas on the main pipeline; the electrolytic cell is arranged on the main pipeline and communicates with the main pipeline, so that gas in the main pipeline enters the electrolytic cell, the electrolytic cell is inflated in a step-by-step pressurization mode through the two-stage pressure reducing valve, and the situation that weak parts of the electrolytic cell are damaged due to large flow and large pressure fluctuation of the electrolytic cell can be avoided; the safety valve is arranged in the busbar set, and the safety valve is arranged on the main pipeline, so that the safety risk caused by sudden pressure increase after the pressure reducing valve is abnormal is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of water electrolysis hydrogen production equipment, and in particular to an alkaline electrolytic cell pressure test detection device and a pressure test method. Background Art

[0002] Against the backdrop of global energy security and carbon neutrality, the demand for hydrogen energy has exploded and the electrolyzer market has taken off. Due to its cost advantage, alkaline electrolyzers have become the dominant force in the hydrogen production market by electrolyzing water.

[0003] For the production of alkaline electrolyzers, after the alkaline electrolyzers are assembled, they must be subjected to pressure tests to ensure that the pressure resistance, air tightness, and leakage of the electrolyzers are qualified, so as to ensure that hydrogen, oxygen, and alkali liquid do not leak out during the operation of the electrolyzers, avoiding safety hazards and environmental pollution. Since the internal volume of alkaline electrolyzers is relatively large, the amount of gas required for pressure tests is relatively large, which leads to the insufficiency of ordinary gas supply facilities. Generally, an air compressor, a storage tank, and a pipeline system are required to provide gas sources for the electrolyzer pressure test. Such a set of equipment generally costs more than 100,000 yuan. Compared with gas cylinders, the cost of alkaline electrolyzer pressure test equipment is greatly increased, and the equipment utilization rate is also relatively low. Because in the electrolyzer industry, most manufacturers ship less than ten sets a year, and most of the time the electrolyzer pressure test equipment is in a shutdown state. Through the optimization of the electrolyzer pressure test process method, a set of systems and methods for alkaline electrolyzer pressure test has been specially developed to reduce the equipment investment cost of enterprises.

[0004] Among them, a PEM electrolyzer air tightness detection device (application number 202410393702.4) is disclosed, which solves the problem of failing to accurately and intuitively quantify tiny leaks.

[0005] Disclosed are an airtight testing device for an electrolytic cell and an electrolytic device (application number: 202323209989.0), which are used to solve the problem of possible leakage of the electrolytic cell.

[0006] A method for detecting the air tightness of a PEM electrolyzer is disclosed (application number 202311620617.9), which mainly prevents the excessive intake speed of the detection gas source from damaging the electrolyzer diaphragm and relieves the pressure in time.

[0007] The above are all solutions to some shortcomings of the electrolytic cell airtightness test, but do not involve the solution of the cost problem. Summary of the invention

[0008] In order to solve the problems existing in the prior art, the present invention provides an alkaline electrolytic cell pressure test detection device and a pressure test method, wherein an alkaline electrolytic cell pressure test detection device includes:

[0009] A container gas group, wherein the container gas group is provided with a plurality of gas cylinders, each of which is connected to a primary pressure reducing valve, and the primary pressure reducing valve performs primary pressure reduction on the gas ejected from the gas cylinder;

[0010] A busbar group is connected to the first-stage pressure reducing valve, and a main pipeline is arranged at one end of the busbar group away from the first-stage pressure reducing valve;

[0011] A secondary pressure reducing valve is arranged on the main pipe, and the secondary pressure reducing valve performs secondary pressure reduction on the gas on the main pipe;

[0012] The electrolytic cell is arranged on the main pipe, and the electrolytic cell is connected to the main pipe so that the gas in the main pipe enters the electrolytic cell.

[0013] Optionally, in some embodiments of the present application, the multiple gas cylinders in the container gas group are arranged in parallel, the volumes of the multiple gas cylinders are equal, and the first-level pressure reducing valves connected to the multiple gas cylinders are provided with pressure gauges.

[0014] Optionally, in some embodiments of the present application, a ball valve is further provided on the main pipe, and the ball valve opens and closes the main pipe.

[0015] Optionally, in some embodiments of the present application, a calibrated pressure gauge, an air intake pressure gauge and a temperature gauge are further provided on the main pipe, and the air intake pressure gauge is provided between the ball valve and the electrolytic cell;

[0016] The calibration pressure gauge is arranged on one side of the electrolytic cell relative to the air intake pressure gauge, so that the electrolytic cell is located between the air intake pressure gauge and the calibration pressure gauge;

[0017] The temperature gauge is located at a position of the electrolytic cell relative to the intake pressure gauge.

[0018] Optionally, in some embodiments of the present application, a safety valve is further provided on the main line, and the safety valve is provided between the electrolytic cell and the secondary pressure reducing valve.

[0019] The present application also provides a pressure test method, including:

[0020] The pressure test method includes an electrolytic cell pressure test detection;

[0021] Among them, the electrolytic cell pressure test includes:

[0022] The gas is supplied through multiple gas cylinders in the container gas group. The gas ejected from the container gas group is reduced in pressure by the first-level pressure reducing valve, enters the bus group, enters the main line through the second-level pressure reducing valve, and then passes through the ball valve on the main line to allow the gas to enter one end of the electrolytic cell. The other end of the electrolytic cell is sealed by a pipeline system with a discharge valve and a calibrated pressure gauge and temperature gauge. During the pressure test, the pressure of the electrolytic cell is adjusted through the above valve and pressure gauge data for pressure testing.

[0023] Optionally, in some embodiments of the present application, the pressure test method includes an electrolytic cell pressure test;

[0024] Step 1: Check that all valves, pipelines, and instrument connections are in place, open the ball valve, and close the discharge valve; open the gas supply valve of the container, adjust the value of the first-level pressure reducing valve to the strength test pressure value of the electrolytic cell, open the second-level pressure reducing valve to the initial value of the electrolytic cell, and adjust the second-level pressure reducing valve step by step to the strength test pressure value of the electrolytic cell according to the pressure of the electrolytic cell. First adjust the second-level pressure reducing valve to a very small pressure, observe the air inlet pressure gauge and the calibration pressure gauge. When the values ​​of the two are close to the pressure of the second-level pressure reducing valve, continue to adjust the second-level pressure reducing valve to increase the pressure a little, and so on, until the pressure reaches the strength test pressure value, close the ball valve, close the nitrogen container, and perform the electrolytic cell strength pressure resistance and pressure maintenance, and record the initial pressure value P1 and the pressure value P2 after the pressure maintenance ends;

[0025] Step 2: Exhaust gas to reduce pressure, open the exhaust valve, pay attention to the values ​​of the calibrated pressure gauge and the intake pressure gauge. When the values ​​of both are close to the airtight pressure requirements, close the exhaust valve, conduct an electrolytic cell airtightness test, conduct a pressure holding test, and record the initial pressure P3 and the pressure value P4 after the pressure holding ends;

[0026] Step 3: Exhaust gas to reduce pressure, open the exhaust valve, pay attention to the values ​​of the calibrated pressure gauge and the air intake pressure gauge. When the values ​​of the two are close to the leakage detection pressure requirements, close the exhaust valve, conduct an electrolytic cell leakage test, and perform a pressure holding test. Record the initial pressure P5, temperature T1 and the pressure value P6 after the pressure holding is completed, temperature T2, and pressure holding time t to calculate the gas leakage.

[0027] Optionally, in some embodiments of the present application, the calculation process of the gas leakage amount is:

[0028]

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. The pipelines, valves, instruments, gas supply boxes and busbars used in the test system are all industry standard components, which are inexpensive, easy to replace and have low overall production costs;

[0031] 2. This system is universally applicable. For large-sized electrolyzers, during the pressure test, it is only necessary to add gas supply boxes and busbar branches without major changes. It also meets the air tightness test requirements of all PEM electrolyzers.

[0032] 3. The electrolytic cell is inflated by step-by-step pressurization through the secondary pressure reducing valve, which can prevent the weak parts of the electrolytic cell from being damaged due to large flow and large pressure fluctuations; the busbar group has a built-in safety valve, and the main line is equipped with a safety valve to reduce the safety risk caused by the sudden increase in pressure after the pressure reducing valve is abnormal;

[0033] 4. A pressure gauge and a temperature gauge are set at the other end of the electrolytic cell to better correct the pressure error; a discharge valve is added to the piping system to allow the electrolytic cell to be pressed into place once and for all without the need to inflate again for different stages of testing, and to facilitate gas discharge after the subsequent pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the electrolytic cell pressure test system flow chart provided in an embodiment of the present application;

[0036] Figure 2 A schematic flow chart of an electrolytic cell pressure testing system provided in the second embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1. Container gas group; 2. First-stage pressure reducing valve; 3. Busbar group; 4. Second-stage pressure reducing valve; 5. Ball valve; 6. Safety valve; 7. Inlet pressure gauge; 8. Calibration pressure gauge; 9. Thermometer; 10. Discharge valve; 11. Electrolyzer; 12. Gas storage tank; 13. Pressure regulating device; 14. Boosting valve; 15. Pressure reducing valve; 16. Pressure detection controller; 17. Connecting pipe; 18. Control valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understandable that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0040] like Figure 1-2 As shown, the improved alkaline electrolytic cell 11 pressure test detection device in the embodiment of the present application is mainly composed of a container gas group 1, a first-level pressure reducing valve 2, a bus group 3, a second-level pressure reducing valve 4, a ball valve 5, a safety valve 6, an air inlet pressure gauge 7, a calibration pressure gauge 8, a thermometer 9 and a discharge valve 10.

[0041] Preferably, a gas storage tank 12 and a pressure regulating device 13 are also provided in the embodiment of the present application.

[0042] Based on the above structure, when the system performs pressure test on the electrolytic cell 11, the gas is supplied through multiple gas cylinders in the container gas group 1. After the gas ejected from the container gas group 1 is reduced in pressure by the first-level pressure reducing valve 2, it enters the bus group 3, and then enters the main line through the second-level pressure reducing valve 4, and then passes through the ball valve 5 on the main line, so that the gas enters one end of the electrolytic cell 11. The other end of the electrolytic cell 11 is blocked by a pipeline system with a discharge valve 10, a calibrated pressure gauge 8 and a thermometer 9. During the pressure test, the pressure of the electrolytic cell 11 is adjusted by the data of the first-level pressure reducing valve 2, the second-level pressure reducing valve 4, the ball valve 5, the discharge valve 10 and the calibrated pressure gauge 8 for pressure test.

[0043] In the above, the container gas group 1 is provided with a plurality of container compartments according to the volume size of the electrolytic cell 11, each container compartment is provided with a gas cylinder, and each container compartment gas cylinder is connected in parallel, and multiple gas cylinders are connected in parallel to meet the gas consumption of the electrolytic cell 11 pressure test in the industry;

[0044] A corresponding first-stage pressure reducing valve 2 is connected to the gas end of each container to reduce the gas pressure to meet the gas pressure requirement of the pressure used for the pressure test of the electrolytic cell 11. A pressure gauge is provided on the first-stage pressure reducing valve 2. The digital display of the pressure gauge can detect whether the pressure of the released gas meets the requirements of the electrolytic cell 11;

[0045] In the embodiment of the present application, preferably, a boost valve 14 may be further provided on the first-stage pressure reducing valve 2, and the boost valve 14 may prevent the pressure of the gas from being too low during the first-stage pressure reducing process.

[0046] At the same time, the decompressed gas is connected to the main pipeline through the bus group 3. A safety valve 6 is arranged in the bus group 3 to prevent the pressure of the gas in the pipeline of the bus group 3 from being too high and causing safety risks.

[0047] A secondary pressure reducing valve 4 is also connected to the main pipeline. The secondary pressure reducing valve 4 is located on the side of the gas storage tank 12 away from the container gas group 1. The secondary pressure reducing valve 4 is mainly used for reducing pressure and regulating pressure so as to prevent the electrolytic cell 11 from being inflated too quickly when the electrolytic cell 11 is supplied with gas, resulting in large pressure changes and damage to the diaphragm components inside the electrolytic cell 11.

[0048] In the second embodiment, the present application preferably has a gas storage tank 12 on the bus group 3, and both ends of the gas storage tank 12 are provided with openings, one end opening is connected to the container gas group 1, so that the gas in the container gas group 1 is transported to the gas storage tank 12; the other end opening is connected to the main pipeline, so that the gas in the gas storage tank 12 can be transported to the main pipeline.

[0049] In the above structure, a pressure control device is provided on the gas storage tank 12. In the embodiment of the present application, the pressure control device is configured as a pressure valve, which is preset with a predetermined pressure value. The predetermined pressure value is the pressure value required in the electrolytic cell 11, and the pressure valve controls the switch of the gas storage tank 12 and controls the gas pressure inside the gas storage tank 12 according to the predetermined pressure value.

[0050] In the embodiment of the present application, the gas pressure in the gas storage tank 12 can be controlled by controlling the pressure valve. At the same time, the gas storage tank 12 is provided to collect and store the gas from multiple gas cylinders in the container gas group 1 to avoid uneven gas pressure in the main pipeline.

[0051] In the second embodiment of the present application, a pressure regulating device 13 is preferably provided on the main pipe, and the pressure regulating device 13 may include the above-mentioned secondary pressure reducing valve 4.

[0052] In the second embodiment of the present application, the pressure regulating device 13 includes a boosting valve 14, a pressure reducing valve 15 and a pressure detection controller 16. The boosting valve 14 and the pressure reducing valve 15 are sequentially arranged on the main line. The boosting valve 14 and the pressure reducing valve 15 respectively boost and reduce the pressure of the gas on the main line, and the boosting and reducing are controlled and processed by the pressure detection controller 16. The pressure detection controller 16 is preset with a predetermined pressure value. When the pressure detection controller 16 detects that the pressure in the main line is less than the predetermined pressure value, the pressure detection controller 16 controls the boosting valve 14 to boost the gas in the main line so that the gas pressure value in the main line is equal to the predetermined pressure value; when the pressure detection controller 16 detects that the pressure in the main line is greater than the predetermined pressure value, the pressure detection controller 16 controls the pressure reducing valve 15 to reduce the pressure of the gas in the main line so that the gas pressure value in the main line is equal to the predetermined pressure value.

[0053] In the above description, the predetermined pressure value is the pressure value required for the pressure test of the electrolytic cell 11 .

[0054] A ball valve 5 is also provided on the main pipeline. The ball valve 5 is mainly used to cut off the rear-end circuit when the pressure test of the electrolytic cell 11 reaches the required pressure, reduce the fluctuation influence of the gas in the front-end pipeline, and maintain the pressure of the electrolytic cell 11;

[0055] The function of the safety valve 6 provided on the main pipeline is to prevent the gas pressure from exceeding the pressure required by the electrolytic cell 11 when the secondary pressure reducing valve 4 is manually adjusted, thereby damaging the electrolytic cell 11 and the pipeline;

[0056] The air inlet pressure gauge arranged behind the safety valve 6 is mainly used to detect the gas pressure of the gas entering the alkaline electrolytic cell 11, and cooperates with the secondary pressure reducing valve 4 to adjust the gas pressure to ensure the pressure of the electrolytic cell 11 is maintained;

[0057] The pressure gauge and temperature gauge 9 provided at the other end of the electrolytic cell 11 are mainly used to correct the influence of uneven gas and temperature change in the electrolytic cell 11 on the pressure in the electrolytic cell 11;

[0058] The discharge valve 10 is mainly used to exhaust the main pipeline in different stages of the alkaline electrolytic cell 11 such as pressure strength test, air tightness test, leakage test, etc., so as to adjust the pressure in the electrolytic cell 11.

[0059] In the second embodiment of the present application, a connecting pipe 17 is further provided on the electrolytic cell 11, and both ends of the connecting pipe 17 are connected to both ends of the electrolytic cell 11. A control valve 18 is provided on the connecting pipe 17, and the control valve 18 is used to disconnect and connect the connecting pipe 17 on the electrolytic cell 11.

[0060] In the above description, the main pipeline on one side of the electrolytic cell 11 is connected to the connecting pipe 17 , so that the gas in the main pipeline can enter the other side of the electrolytic cell 11 through the connecting pipe 17 .

[0061] By providing the connecting pipe 17 and the control valve 18 , the gas pressure at both ends of the electrolytic cell 11 can be controlled to always be equal, so as to facilitate experiments on the electrolytic cell 11 .

[0062] When the above system performs a pressure test on the alkaline electrolytic cell 11, the main pipeline is connected with a manual valve and an instrument to form a pipeline system, which is then connected to one end of the electrolytic cell 11. The other end of the electrolytic cell 11 is sealed and connected through the main pipeline, valve, and instrument to form a pipeline system. The pressure test of the electrolytic cell 11 mainly consists of pressure resistance, air tightness, and leakage tests of the electrolytic cell 11.

[0063] When conducting a pressure strength test on the alkaline electrolytic cell 11, first check that all valves, pipelines, and instrument connections are in place, open the ball valve 5, and close the discharge valve 10; then open the gas supply valve of the container, adjust the value of the first-level pressure reducing valve 2 to the strength test pressure value of the electrolytic cell 11 or check the strength value of the gas in the gas storage tank 12, and then open the second-level pressure reducing valve 4 to the initial value of the electrolytic cell 11. According to the pressure of the electrolytic cell 11, the second-level pressure reducing valve 4 can be adjusted step by step to the strength test pressure value of the electrolytic cell 11. First, adjust the second-level pressure reducing valve 4 to a very small pressure, observe the intake pressure gauge 7 and the calibration pressure gauge 8, and when the values ​​of the two are close to the pressure of the second-level pressure reducing valve 4, continue to adjust the second-level pressure reducing valve 4 to increase the pressure a little, and so on, until the pressure reaches the strength test pressure value, or in the second embodiment, adjust other pressures in the main pipeline through the pressure regulating device 13 until the pressure reaches the strength test pressure value, then close the ball valve 5, close the nitrogen container, and perform strength pressure resistance and pressure maintenance of the electrolytic cell 11, and record the initial pressure value P1 and the pressure value P2 after the pressure maintenance ends.

[0064] At the same time, it is also necessary to conduct an air tightness test on the alkaline electrolytic cell 11 after the strength pressure test. Since the strength pressure test pressure of the electrolytic cell 11 is greater than the air tightness test pressure, a part of the gas is discharged to reduce the pressure on the basis of the original pressure, and the discharge valve 10 is slowly opened. Pay attention to the values ​​of the calibrated pressure gauge 8 and the intake pressure gauge 7. When the values ​​of the two are close to the air tightness pressure requirement, close the discharge valve 10, and conduct an air tightness test on the electrolytic cell 11, that is, a pressure holding test, and record the initial pressure P3 and the pressure value P4 after the pressure holding is completed;

[0065] The strength pressure-resistant and pressure-maintaining process of the electrolytic cell 11 can also be controlled by the control valve 18 on the connecting pipe 17 to always keep the gas pressures on both sides of the electrolytic cell 11 at the same pressure value.

[0066] After the air tightness test of the alkaline electrolytic cell 11 is completed, a leakage test of the electrolytic cell 11 is performed. Since the air tightness test pressure of the electrolytic cell 11 is greater than the pressure during the leakage detection, a part of the gas is discharged to reduce the pressure on the basis of the original air tightness pressure, and the discharge valve 10 is slowly opened. The values ​​of the calibrated pressure gauge 8 and the intake pressure gauge 7 are noted. When the values ​​of the two are close to the leakage detection pressure requirement, the discharge valve 10 is closed and the leakage test of the electrolytic cell 11 is performed, that is, the same pressure holding test is performed, and the initial pressure P5, temperature T1 and the pressure value P6 after the pressure holding is completed, temperature T2, and pressure holding time t are recorded; the leakage A is calculated by the following formula:

[0067]

[0068] The air tightness experiment of the electrolytic cell 11 mentioned above can be simply obtained through its pressure maintenance test, but after calculating the leakage of the electrolytic cell 11, a multi-stage test can be performed through the connecting pipe 17 and the control valve 18 and the gas storage tank 12, and the pressure on both sides of the electrolytic cell 11 is adjusted step by step, and the air pressure on both sides of the electrolytic cell 11 is increased or decreased. After each adjustment of the air pressure of the electrolytic cell 11, it is tested step by step to detect its leakage and accurately determine the air tightness of the electrolytic cell 11.

[0069] The above is a pressure test system and method for the alkaline electrolytic cell 11. The pipelines, valves, instruments, gas supply containers, and bus group 3 used in this pressure test system are all industry standard components, which are inexpensive, easy to replace, and have low overall production costs. In addition, this system has universal applicability. For large-sized square electrolytic cells 11, during the pressure test, only the gas supply container and bus group 3 branches need to be added without major changes. At the same time, it also meets all PEM electrolytic cell 11 air tightness tests.

[0070] The electrolytic cell 11 is inflated by the secondary pressure reducing valve 4 in a step-by-step pressurization manner, which can prevent the electrolytic cell 11 from being damaged due to large flow and large pressure fluctuations; the busbar group 3 has a built-in safety valve 6, and the main pipeline is provided with a safety valve 6 to reduce the safety risk caused by the sudden increase in pressure after the primary pressure reducing valve 2 is abnormal. The other end of the electrolytic cell 11 is provided with a calibrated pressure gauge 8 and a temperature gauge 9 to better correct the pressure error; the pipeline system is provided with a discharge valve 10 to make the electrolytic cell 11 punched in place once, without the need to re-inflate for different stages of testing, and at the same time facilitate the gas discharge after the subsequent pressure test.

[0071] In the above structure, a control terminal is also provided, which collects and processes data of the first-stage pressure reducing valve 2, the second-stage pressure reducing valve 4 and the air intake pressure gauge 7, wherein the control terminal also performs terminal control on the ball valve 5, so that when the pressure test of the electrolytic cell 11 reaches the required pressure, the control terminal controls the switch of the ball valve 5 to cut off the rear-end circuit, thereby reducing the fluctuation influence of the gas in the front-end pipeline.

[0072] At the same time, the control terminal in the present application can directly perform direct pressure control on the electrolytic cell 11. The control terminal has a preset pressure value of the electrolytic cell 11. According to the preset pressure value of the electrolytic cell 11, the pressure values ​​of the first-level pressure reducing valve 2 and the second-level pressure reducing valve 4 can be controlled to allow appropriate gas pressure to enter the electrolytic cell 11, thereby performing pressure detection on the electrolytic cell 11.

[0073] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An alkaline electrolytic cell pressure test detection device, characterized in that: include: A container gas group, wherein the container gas group is provided with a plurality of gas cylinders, each of which is connected to a primary pressure reducing valve, and the primary pressure reducing valve performs primary pressure reduction on the gas ejected from the gas cylinder; A busbar group is connected to the first-stage pressure reducing valve, and a main pipeline is arranged at one end of the busbar group away from the first-stage pressure reducing valve; A secondary pressure reducing valve is arranged on the main pipe, and the secondary pressure reducing valve performs secondary pressure reduction on the gas on the main pipe; The electrolytic cell is arranged on the main pipe, and the electrolytic cell is connected to the main pipe so that the gas in the main pipe enters the electrolytic cell.

2. The alkaline electrolytic cell pressure test detection device according to claim 1, characterized in that: The main pipe is also provided with a ball valve, which opens and closes the main pipe.

3. The alkaline electrolytic cell pressure test detection device according to claim 2, characterized in that: The main pipe is also provided with a calibrated pressure gauge, an air intake pressure gauge and a temperature gauge, and the air intake pressure gauge is arranged between the ball valve and the electrolytic cell; The calibration pressure gauge is arranged on one side of the electrolytic cell relative to the air intake pressure gauge, so that the electrolytic cell is located between the air intake pressure gauge and the calibration pressure gauge; The temperature gauge is located at a position of the electrolytic cell relative to the air intake pressure gauge; The main pipe is also provided with a safety valve, and the safety valve is arranged between the electrolytic cell and the secondary pressure reducing valve.

4. The alkaline electrolytic cell pressure test detection device according to claim 3, characterized in that: The busbar group is provided with a gas storage tank, the gas storage tank is connected to the container gas group, and the gas storage tank is provided with a pressure control device, the pressure control device controls the gas pressure inside the gas storage tank.

5. The alkaline electrolytic cell pressure test detection device according to claim 4, characterized in that: A pressure regulating device is provided on the main pipe between the secondary pressure reducing valve and the electrolytic cell, and the pressure regulating device regulates the pressure value of the gas in the main pipe; Wherein, the pressure regulating device includes a boosting valve, a reducing valve and a pressure detection controller, the boosting valve and the reducing valve are sequentially arranged on the main line, the pressure detection controller is preset with a predetermined pressure value, when the pressure detection controller detects that the pressure in the main line is less than the predetermined pressure value, the pressure detection controller controls the boosting valve to boost the pressure of the gas in the main line so that the gas pressure value in the main line is equal to the predetermined pressure value; when the pressure detection controller detects that the pressure in the main line is greater than the predetermined pressure value, the pressure detection controller controls the reducing valve to reduce the pressure of the gas in the main line so that the gas pressure value in the main line is equal to the predetermined pressure value.

6. The alkaline electrolytic cell pressure test detection device according to claim 5, characterized in that: A connecting pipe is provided on the electrolytic cell, both ends of the connecting pipe are connected to the two ends of the electrolytic cell, and one end of the connecting pipe is connected to the main pipeline; The communicating pipe is provided with a control valve, and the control valve controls the gas pressure at both ends of the electrolytic cell.

7. A pressure test method, performed according to the alkaline electrolytic cell pressure test detection device according to any one of claims 1 to 6, characterized in that: The pressure test method includes an electrolytic cell pressure test detection; Among them, the electrolytic cell pressure test includes: The gas is supplied through multiple gas cylinders in the container gas group. After the gas ejected from the container gas group is reduced in pressure by the first-level pressure reducing valve, it enters the gas storage tank of the bus group, and enters the main line through the second-level pressure reducing valve, and then passes through the ball valve and pressure regulating device on the main line in turn, so that the gas enters one end of the electrolytic cell. The other end of the electrolytic cell is blocked by a pipeline system with a discharge valve, a calibrated pressure gauge and a temperature gauge. During the pressure test, the pressure of the electrolytic cell is adjusted through the data of the first-level pressure reducing valve, the second-level pressure reducing valve, the ball valve, the discharge valve and the calibrated pressure gauge as well as the control valve for pressure testing.

8. A pressure testing method according to claim 7, characterized in that: The pressure test method includes an electrolytic cell pressure test; Step 1: Check that all valves, pipelines, and instrument connections are in place, open the ball valve, and close the discharge valve; open the gas supply valve of the container, adjust the value of the first-level pressure reducing valve to the strength test pressure value of the electrolytic cell, open the second-level pressure reducing valve to the initial value of the electrolytic cell, and adjust the second-level pressure reducing valve step by step to the strength test pressure value of the electrolytic cell according to the pressure value of the electrolytic cell. First adjust the pressure of the second-level pressure reducing valve, observe the air inlet pressure gauge and the calibration pressure gauge. When the values ​​of the two are close to the pressure of the second-level pressure reducing valve, continue to adjust the second-level pressure reducing valve to increase the pressure a little, and so on, until the pressure reaches the strength test pressure value, close the ball valve, close the nitrogen container, and perform the strength pressure resistance and pressure maintenance of the electrolytic cell, and record the initial pressure value P1 and the pressure value P2 after the pressure maintenance ends; Step 2: Exhaust gas to reduce pressure, open the exhaust valve, pay attention to the values ​​of the calibrated pressure gauge and the intake pressure gauge. When the values ​​of both are close to the airtight pressure requirements, close the exhaust valve, conduct an electrolytic cell airtightness test, conduct a pressure holding test, and record the initial pressure P3 and the pressure value P4 after the pressure holding ends; Step 3: Exhaust gas to reduce pressure, open the exhaust valve, pay attention to the values ​​of the calibrated pressure gauge and the air intake pressure gauge. When the values ​​of the two are close to the leakage detection pressure requirements, close the exhaust valve, conduct an electrolytic cell leakage test, and perform a pressure holding test. Record the initial pressure P5, temperature T1 and the pressure value P6 after the pressure holding is completed, temperature T2, and pressure holding time t to calculate the gas leakage.

9. A pressure testing method according to claim 8, characterized in that: In the step 1, the pressure value of the electrolytic cell strength test is adjusted by the pressure regulating device.

10. A pressure testing method according to claim 8, characterized in that: The calculation formula of the gas leakage is:

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