Device and method for detecting sealing performance of electrolytic cell

Abstract

The embodiment of the invention provides a device and a method for detecting the sealing performance of an electrolytic cell. The device comprises an air source, a first air delivery pipe, a second air delivery pipe, a first on-off valve, a second on-off valve, a pressure release valve and an air pressure meter, the first gas conveying pipe and the second gas conveying pipe are communicated with a gas source in parallel, the first gas conveying pipe is used for conveying gas to the electrolytic cell anode, and the second gas conveying pipe is used for conveying gas to the electrolytic cell cathode; the first on-off valve is arranged on the first gas conveying pipe, the second on-off valve is arranged on the second gas conveying pipe, at least one of the first gas conveying pipe and the second gas conveying pipe is provided with a pressure release valve, and at least the other one of the first gas conveying pipe and the second gas conveying pipe is provided with a gas pressure meter; the liquid conveying assembly communicates with the cathode side and / or the anode side of the electrolytic cell and conveys detection liquid to the cathode side and / or the anode side of the electrolytic cell. The detection device provided by the embodiment of the invention not only can measure the internal sealing leakage rate of the electrolytic bath, but also can measure the external sealing leakage rate, enriches the testing function, and is particularly suitable for measuring the internal sealing leakage rate of the alkaline water electrolytic bath.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytic hydrogen production, and in particular to a device and method for detecting the sealing performance of an electrolytic cell. Background Art

[0002] Hydrogen production by water electrolysis is currently the simplest and most effective way to obtain high-purity hydrogen. It has the advantages of being environmentally friendly and highly economical, and has a good development prospect. Among them, the sealing of the electrolyzer is a key indicator of the reliability of hydrogen production by water electrolysis.

[0003] At present, the main methods for sealing detection include water inspection method, direct pressure test method, element tracking method and soap smearing method. Among them, the water inspection method is to put the electrolytic cell into water in a sealed manner, and judge the leakage by observing the bubbles generated in the sealed container. The direct pressure test method is to inflate the electrolytic cell, and judge whether the equipment is leaking by measuring the pressure change in the equipment over a period of time. The element tracking method is to fill a certain amount of medium gas into the electrolytic cell, and use a mass spectrometer to detect the amount of medium gas elements in the space outside the equipment to judge whether there is a leak. The soap smearing method is to apply soapy water to the gaps in the electrolytic cell to see if there are soap bubbles and judge the leakage.

[0004] The diaphragm in the electrolytic cell isolates the cathode and the anode, and can isolate the generated oxygen and hydrogen. The sealing inside the electrolytic cell mainly depends on the sealing of the diaphragm. However, the above detection methods cannot measure the sealing leakage rate inside the electrolytic cell and the external sealing leakage rate at the same time. Summary of the invention

[0005] The embodiments of the present application provide an electrolytic cell sealing detection device and a detection method to solve the problem that related detection technologies cannot measure both the internal and external sealing leakage rates of the electrolytic cell.

[0006] In order to solve the above problems, this application is implemented as follows:

[0007] The embodiment of the present application provides an electrolytic cell sealing detection device, comprising: a gas source, a first gas pipeline, a second gas pipeline, a first on-off valve, a second on-off valve, a pressure relief valve and a pressure gauge;

[0008] The first gas supply pipe and the second gas supply pipe are connected in parallel to the gas source, the first gas supply pipe is used to supply gas to the anode of the electrolytic cell, and the second gas supply pipe is used to supply gas to the cathode of the electrolytic cell;

[0009] The first on-off valve is disposed on the first gas pipeline, the second on-off valve is disposed on the second gas pipeline, the pressure relief valve is disposed on at least one of the first gas pipeline and the second gas pipeline, and the pressure gauge is disposed on at least the other of the first gas pipeline and the second gas pipeline;

[0010] A liquid delivery component is connected to the cathode side and / or the anode side of the electrolytic cell and is used to deliver the detection liquid to the cathode side and / or the anode side of the electrolytic cell.

[0011] Optionally, the first gas pipeline and the second gas pipeline are each provided with a pressure relief valve and a pressure gauge, and the pressure relief valve is closer to the gas source than the pressure gauge.

[0012] Optionally, the electrolytic cell sealing detection device further includes an ultrasonic detector disposed at the periphery of the electrolytic cell, for detecting a gas leakage position of the electrolytic cell.

[0013] Optionally, the electrolytic cell sealing detection device further includes a pressure stabilizing container;

[0014] The inlet of the pressure-stabilizing container is communicated with the gas source, and the outlet of the pressure-stabilizing container is communicated with the first gas pipeline and the second gas pipeline.

[0015] Optionally, the electrolytic cell sealing detection device further comprises a third gas pipeline and a third on-off valve, wherein the third gas pipeline is arranged between the inlet of the pressure-stabilizing container and the gas source, and the third on-off valve is arranged on the third gas pipeline;

[0016] And / or, the electrolytic cell sealing detection device also includes a fourth gas pipe and a fourth on-off valve, the fourth gas pipe is arranged between the outlet of the pressure-stabilizing container and the first gas pipe and the second gas pipe, and the fourth on-off valve is arranged on the fourth gas pipe.

[0017] The present application also provides a method for detecting the sealing performance of an electrolytic cell, using any of the detection devices described above, the method comprising:

[0018] Filling the electrolytic cell with the detection liquid through the liquid delivery assembly;

[0019] After standing for a period of time, the electrolytic cell is inspected for liquid leakage and the location of the leakage.

[0020] Optionally, the method is used to detect the internal seal leakage rate of the electrolytic cell,

[0021] The step of detecting whether the electrolytic cell has liquid seepage and the location of the liquid seepage comprises:

[0022] Discharging part of the liquid to a preset position, which is higher than the alkali solution distribution hole on the electrolytic cell plate;

[0023] Open the gas source, and open the first on-off valve or the second on-off valve;

[0024] When the gas enters the electrolytic cell and reaches a stable gas pressure state, the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell are recorded, and the first on-off valve or the second on-off valve is closed;

[0025] Open the pressure relief valve on the second gas pipeline or the first gas pipeline and keep it open for a certain time. Record the absolute gas pressure p2 and the gas thermodynamic temperature T2 in the electrolytic cell at the end of the test. The time between the end of the test and the initial state is t. Calculate the leakage rate A according to the following formula:

[0026]

[0027] Optionally, the method is used to detect the leakage rate of the outer seal of the electrolytic cell,

[0028] The step of detecting whether the electrolytic cell has liquid seepage and the location of the liquid seepage comprises:

[0029] draining at least some of the fluid;

[0030] Open the gas source, and open the first on-off valve and / or the second on-off valve;

[0031] When the gas enters the electrolytic cell and reaches a stable gas pressure state, the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell are recorded, and the first on-off valve and / or the second on-off valve are closed;

[0032] Keep it for a certain time, record the absolute pressure p2 and gas thermodynamic temperature T2 in the electrolytic cell at the end of the test, the time between the end of the test and the initial state is t, calculate the leakage rate A, according to the following formula:

[0033]

[0034] Optionally, the step of detecting whether liquid seepage occurs in the electrolytic cell and the location of the liquid seepage includes:

[0035] draining at least some of the fluid;

[0036] Open the gas source, and open the first on-off valve and / or the second on-off valve, so that the gas enters the electrolytic cell through the gas pipe;

[0037] An ultrasonic detector is used to detect gas leakage and determine the location of the gas leakage.

[0038] Optionally, discharging at least part of the liquid is to lower the liquid level in the electrolytic cell to below the alkali solution distribution holes on the electrolytic cell plates.

[0039] The electrolytic cell sealing detection device and detection method provided in the present embodiment, when the pressure relief valve is arranged on the first gas pipeline, the pressure gauge is arranged on the second gas pipeline, and this device can be used to measure the inner seal leakage rate and the outer seal leakage rate on the cathode side. When the pressure relief valve is arranged on the second gas pipeline, the pressure gauge is arranged on the first gas pipeline, and this device can be used to measure the inner seal leakage rate and the outer seal leakage rate on the anode side. When the first gas pipeline and the second gas pipeline are each provided with a said pressure relief valve and a said pressure gauge, it is possible to flexibly choose to measure the inner seal leakage rate or the outer seal leakage rate on either the anode side or the cathode side. The inner seal leakage rate in the present application refers to the leakage rate between the cathode side and the anode side of the electrolytic cell, and the outer seal leakage rate refers to the leakage rate between the cathode side and / or the anode side of the electrolytic cell and the external environment of the electrolytic cell. Therefore, the detection device and method provided in the present embodiment can measure both the inner seal leakage rate and the outer seal leakage rate of the electrolytic cell, thereby enriching the test function. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A schematic diagram showing the structure of an electrolytic cell sealing detection device provided in an embodiment of the present application;

[0042] Figure 2 The flowchart of the electrolytic cell sealing detection method provided in the embodiment of the present application is shown.

[0043] Description of reference numerals:

[0044] 1-gas source, 21-first gas pipeline, 22-second gas pipeline, 23-third gas pipeline, 24-fourth gas pipeline, 31-first on-off valve, 32-second on-off valve, 33-third on-off valve, 34-fourth on-off valve, 35-fifth on-off valve, 41-first pressure relief valve, 42-second pressure relief valve, 51-first pressure gauge, 52-second pressure gauge, 53-third pressure gauge, 61-drain valve, 62-liquid storage tank, 63-liquid infusion pipe, 64-alkali solution inlet and outlet valves, 7-ultrasonic detector, 8-pressure stabilizing container, 9-electrolyzer. DETAILED DESCRIPTION

[0045] 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0047] Reference Figure 1 The embodiment of the present application provides an electrolytic cell sealing detection device, comprising: a gas source 1, a first gas pipe 21, a second gas pipe 22, a first on-off valve 31, a second on-off valve 32, a pressure relief valve and a pressure gauge; the first gas pipe 21 and the second gas pipe 22 are connected in parallel to the gas source 1, the first gas pipe 21 is used to supply gas to the anode of the electrolytic cell 9, and the second gas pipe 22 is used to supply gas to the cathode of the electrolytic cell 9; the first on-off valve 31 is arranged on the first gas pipe 21, the second on-off valve 32 is arranged on the second gas pipe 22, at least one of the first gas pipe 21 and the second gas pipe 22 is provided with the pressure relief valve, and at least the other one of the first gas pipe 21 and the second gas pipe 22 is provided with the pressure gauge; a liquid delivery component, the liquid delivery component is connected to the cathode side and / or the anode side of the electrolytic cell 9, and is used to deliver the detection liquid to the cathode side and / or the anode side of the electrolytic cell 9.

[0048] Specifically, if Figure 1As shown, the electrolytic cell 9 is the place where the electrolytic reaction occurs. When the power is turned on, an oxidation reaction occurs at the interface between the anode and the solution to generate oxygen, and a reduction reaction occurs at the interface between the cathode and the solution to generate hydrogen. The electrolytic cell 9 in the present application can be a proton exchange membrane electrolyzer (PEM) or an alkaline water electrolyzer (ALK). In this embodiment, the alkaline water electrolyzer (ALK) is used as an example for illustration. The inner seal leakage rate in the present application refers to the leakage rate between the cathode side and the anode side of the electrolytic cell, and the outer seal leakage rate refers to the leakage rate between the cathode side and / or the anode side of the electrolytic cell and the external environment of the electrolytic cell. The gas source 1 is used to provide a medium gas for detecting air tightness, and an air pump or a pressure gas tank can be used. One end of the first gas supply pipe 21 is connected to the gas source 1, and the other end is connected to the anode of the electrolytic cell 9. One end of the second gas supply pipe 22 is connected to the gas source 1, and the other end is connected to the cathode of the electrolytic cell 9. And the first gas pipe 21 and the second gas pipe 22 are connected in parallel to the gas source 1, that is, the gas generated by the gas source 1 can enter the anode from the first gas pipe 21, and can also enter the cathode from the second gas pipe 22. The first on-off valve 31 is arranged on the first gas pipe 21, and the second on-off valve 32 is arranged on the second gas pipe 22. The on-off valve can be in the form of a reverse flow valve, a check valve, a one-way valve or a stop valve. The present embodiment adopts a check valve, which is a valve that automatically opens and closes the valve flap by relying on the flow of the medium itself, so as to prevent the medium from flowing back. The liquid delivery assembly includes a liquid storage tank 62, a liquid delivery tube 63 and a fifth on-off valve 35; one end of the liquid delivery tube 63 is connected to the liquid storage tank 62, and the other end is used to deliver the detection liquid to the cathode side and / or anode side of the electrolytic cell 9. The fifth on-off valve 35 is arranged on the liquid delivery tube 63. As shown Figure 1 As shown, one end of the infusion tube 63 is connected to the liquid storage tank 62, and the other end is connected to the cathode and anode chambers in the electrolytic cell 9 through the alkali solution distribution hole on the electrolytic cell plate. The fifth on-off valve 35 is arranged on the infusion tube 63 to control the on-off of the infusion tube 63. At the same time, a drain valve 61 is arranged on the electrolytic cell 9. The detection liquid can be pure water or alkali solution, and the present embodiment uses alkali solution.

[0049] Specifically, if Figure 1 As shown, when the first gas pipe 21 is provided with a first pressure relief valve 41 and the second gas pipe 22 is provided with a second pressure gauge 52, the device can measure the internal seal leakage rate and external leakage rate of the cathode side of the electrolytic cell; and when the first gas pipe 21 is provided with a first pressure gauge 51 and the second gas pipe 22 is provided with a second pressure relief valve 42, the device can measure the internal seal leakage rate and external leakage rate of the anode side of the electrolytic cell. For specific test steps, refer to the electrolytic cell sealing detection method described later.

[0050] The electrolytic cell sealing detection device provided in this embodiment can measure both the internal and external sealing leakage rates of the electrolytic cell, thereby enriching the testing functions and meeting the requirements of different testing scenarios.

[0051] Optionally, refer to Figure 1 The first gas pipeline 21 and the second gas pipeline 22 are each provided with a pressure relief valve and a pressure gauge, and the pressure relief valve is closer to the gas source than the pressure gauge.

[0052] Specifically, if Figure 1 As shown, when the first gas pipeline 21 is provided with a first pressure gauge 51 and a first pressure relief valve 41, and the second gas pipeline 22 is provided with a second pressure gauge 52 and a second pressure relief valve 42, the device can flexibly select to measure the inner seal leakage rate or the outer seal leakage rate on either the anode side or the cathode side. Taking the first gas pipeline 21 as an example, the first on-off valve 31 provided thereon is closer to the gas source than the first pressure gauge 51, and the first pressure relief valve 41 is located between the first on-off valve 31 and the first pressure gauge 51, so as to avoid the pressure gauge measuring data being affected by the pressure fluctuation and being inaccurate during the pressure relief process.

[0053] Optionally, refer to Figure 1 The electrolytic cell sealing detection device also includes an ultrasonic detector 7 arranged at the periphery of the electrolytic cell, which is used to detect the gas leakage position of the electrolytic cell 9.

[0054] Specifically, if Figure 1 As shown, the ultrasonic detectors 7 are arranged around the electrolytic cell 9, and the number is one, two, three or more, and they are evenly arranged. When the medium gas is introduced into the electrolytic cell 9, the gas will rush out from the leak hole, and the turbulent flow of the rushing gas will generate a certain ultrasonic frequency near the leak hole. The ultrasonic detector 7 accurately locates the leak position and flow rate according to the reflection of the gas ultrasonic wave at the leak.

[0055] Optionally, refer to Figure 1 The electrolytic cell sealing detection device also includes a pressure-stabilizing container 8; the inlet of the pressure-stabilizing container 8 is connected to the gas source 1, and the outlet of the pressure-stabilizing container 8 is connected to the first gas pipe 21 and the second gas pipe 22.

[0056] Specifically, if Figure 1 As shown, the pressure stabilizing container 8 adopts a pressure stabilizing tank, whose inlet is connected to the gas source 1, and the outlet of the pressure stabilizing container 8 is connected to the first gas pipeline 21 and the second gas pipeline 22. Since the gas pressure output by the air pump is relatively high, it passes through the pressure stabilizing container 8 to stabilize the gas pressure and prevent the gas from impacting the electrolytic cell and causing damage to the diaphragm. The pressure stabilizing container 8 is provided with a third barometer 53 to monitor the gas pressure and prevent abnormal fluctuations.

[0057] Optionally, refer to Figure 1The electrolytic cell sealing detection device further includes a third gas pipeline 23 and a third on-off valve 33; the third gas pipeline 23 is arranged between the inlet of the pressure-stabilizing container 8 and the gas source 1; the third on-off valve 33 is arranged on the third gas pipeline 23;

[0058] In this embodiment, the electrolytic cell sealing detection device also includes a fourth gas pipe 24 and a fourth on-off valve 34. The fourth gas pipe 24 is arranged between the outlet of the pressure-stabilizing container 8 and the first gas pipe 21 and the second gas pipe 22. The fourth on-off valve 34 is arranged on the fourth gas pipe 24.

[0059] Specifically, if Figure 1 As shown, in this embodiment, a third gas pipeline 23 is connected between the inlet of the pressure-stabilizing container 8 and the gas source 1, and a fourth gas pipeline 24 is connected between the outlet of the pressure-stabilizing container 8 and the first gas pipeline 21 and the second gas pipeline 22. A third on-off valve 33 is provided on the third gas pipeline 23, and a fourth on-off valve 34 is provided on the fourth gas pipeline 24 to control the progress of the test process. The gas generated by the gas source 1 enters the pressure-stabilizing container 8 through the third gas pipeline 23, and after pressure stabilization, enters the first gas pipeline 21 and the second gas pipeline 22 respectively through the fourth gas pipeline 24. In some other embodiments, the first gas pipeline 21 and the second gas pipeline 22 can also be directly connected to the pressure-stabilizing container 8, thereby omitting the fourth gas pipeline 24 and the fourth on-off valve 34 provided thereon. In addition, the gas source 1 can also be directly connected to the pressure-stabilizing container 8, thereby omitting the third gas pipeline 23 and the third on-off valve 33 provided thereon.

[0060] The present application also provides a method for detecting the sealing performance of an electrolytic cell, using the electrolytic cell sealing performance detection device of any of the above embodiments, referring to Figure 1 and Figure 2 , the method comprising:

[0061] Step 100, filling the electrolytic cell 9 with the detection liquid through the liquid delivery assembly;

[0062] Specifically, in this embodiment, a liquid delivery assembly is used to fill the electrolytic cell 9 with the detection liquid, the fifth on-off valve 35 and the alkali solution inlet and outlet valve 64 are opened, and the detection liquid is filled into the electrolytic cell 9 through the infusion tube 63 until the liquid level indicator shows that the electrolytic cell is full, and the fifth on-off valve 35 and the alkali solution inlet and outlet valve 64 are closed. On the one hand, the detection liquid infiltrates the diaphragm in the electrolytic cell 9, and on the other hand, it is convenient for subsequent steps to detect whether there is leakage in the electrolytic cell.

[0063] Step 200, let it stand for a period of time to detect whether there is liquid seepage and the location of the seepage.

[0064] Specifically, in this embodiment, the electrolytic cell filled with water is left to stand for more than one hour to detect whether there is liquid leakage. Mainly detect all valves, flanges or threaded connections, welds, gaskets and other sealing points, and those without water stains and dripping are qualified. Especially for alkaline water electrolytic cells (ALK), this step is necessary. The diaphragm is infiltrated with alkali solution to prevent leakage of the diaphragm during subsequent inflation tests, which is difficult to reflect the leakage under the actual operating state. If there is no liquid leakage, it preliminarily indicates that the sealing of the electrolytic cell is good. If there is liquid leakage, it is necessary to judge the leakage position by the leakage position.

[0065] After step 200, when it is necessary to measure the internal seal leakage rate of the electrolytic cell, the steps are as follows:

[0066] Step 301 , discharge part of the liquid to a preset position, which is higher than the alkali solution distribution hole on the plate of the electrolytic cell; open the gas source 1 , and open the first on-off valve 31 or the second on-off valve 32 .

[0067] Specifically, taking the determination of the internal seal leakage rate on the anode side of the electrolytic cell as an example, the drain valve 61 is opened to discharge part of the liquid to a preset position, which is higher than the alkali solution distribution hole on the electrolytic cell plate, to prevent the gas from entering the cathode through the alkali solution distribution hole when the gas is subsequently introduced to the anode side; the gas source 1 is opened, and the first on-off valve 31 is opened, so that the gas can flow from the pressure-stabilizing container 8 into the gas pipe.

[0068] Step 302 , when the gas enters the electrolytic cell and reaches a stable gas pressure state, the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell are recorded, and the first on-off valve 31 is closed.

[0069] Specifically, when the gas enters the electrolytic cell and reaches a stable gas pressure state, that is, the gas pressure is stable within the range of 2.5±0.1 kPa, all on-off valves are closed. When measuring the internal seal leakage rate on the anode side of the electrolytic cell, the gas pressure p1 on the anode side is measured by the first barometer 51, and the absolute temperature T1 on the anode side is measured by the temperature element inside the electrolytic cell. It should be noted that the principle for determining the above-mentioned stable pressure range is to be less than the bubble point pressure of the diaphragm.

[0070] Step 303, open the second pressure relief valve 42 or the first pressure relief valve 41, keep it open for a certain time, record the absolute pressure p2 and the thermodynamic temperature T2 of the gas in the electrolytic cell at the end of the test, the time between the end of the test and the initial state is t, calculate the leakage rate A, according to the following formula:

[0071]

[0072] Specifically, here, taking the determination of the internal seal leakage rate on the anode side of the electrolytic cell as an example, the second pressure relief valve 42 is opened and maintained for a certain period of time, the absolute air pressure p2 and the gas thermodynamic temperature T2 on the anode side of the electrolytic cell at the end of the test are recorded, and the leakage rate A is calculated. It should be noted that the leakage rate A is the leakage rate per hour, the unit is percentage "%", the unit of time t is hour "h", the unit of the air pressure p1 at the start of the test and the air pressure p2 at the end of the test is megapascal "MPa", and the unit of the thermodynamic temperature T1 at the start of the test and the thermodynamic temperature T2 at the end of the test is Kelvin "K". The above embodiment is described by taking the determination of the internal seal leakage rate on the anode side of the electrolytic cell as an example, and when it is necessary to determine the internal seal leakage rate on the cathode side of the electrolytic cell, it can be referred to.

[0073] After step 200, when it is necessary to measure the leakage rate of the outer seal of the electrolytic cell, the steps are as follows:

[0074] Step 311, drain at least part of the liquid, open the gas source 1, and open the first on-off valve 31 and / or the second on-off valve 32;

[0075] Specifically, the drain valve 61 is opened to discharge at least part of the liquid. At this time, the liquid level is not required to be higher than the alkali solution distribution hole. The liquid level in the electrolytic cell can also be lowered to below the alkali solution distribution hole on the electrolytic cell plate, for example, all the detection liquid is discharged. When the liquid level in the electrolytic cell is still above the alkali solution distribution hole on the electrolytic cell plate after at least part of the liquid is discharged, the first on-off valve 31 and the second on-off valve 32 are opened at the same time, and the first pressure relief valve 41 and the second pressure relief valve 42 are kept in a closed state; when discharging at least part of the liquid is to lower the liquid level in the electrolytic cell to below the alkali solution distribution hole on the electrolytic cell plate, since the cathode side and the anode side of the electrolytic cell are connected, the first on-off valve 31 or the second on-off valve 32 can be opened, or the first on-off valve 31 and the second on-off valve 32 can be opened at the same time.

[0076] Step 312, when the gas enters the electrolytic cell and reaches a stable gas pressure state, record the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell;

[0077] Specifically, the gas pressure and absolute temperature on the anode side or cathode side can be measured at this time.

[0078] Step 313, keep for a certain time, record the absolute pressure p2 and gas thermodynamic temperature T2 in the electrolytic cell at the end of the test, the time between the end of the test and the initial state is t, calculate the leakage rate A, according to the following formula:

[0079]

[0080] Specifically, when measuring the external seal leakage rate, after maintaining the pressure for a period of time, the air pressure and absolute temperature on the anode side or the cathode side are recorded to calculate the leakage rate. It should be noted that, when the barometer is provided on only one of the first gas pipeline and the second gas pipeline, when at least part of the liquid is discharged to reduce the liquid level in the electrolytic cell to below the alkali solution distribution hole on the electrolytic cell plate, since the cathode side and the anode side of the electrolytic cell are connected, the external seal leakage rate measured at this time refers to the leakage rate between the cathode side and the anode side of the electrolytic cell and the external environment of the electrolytic cell; and when at least part of the liquid is discharged, the liquid level in the electrolytic cell is still above the alkali solution distribution hole on the electrolytic cell plate, the external seal leakage rate measured at this time refers to the leakage rate between the cathode side or the anode side of the electrolytic cell and the external environment of the electrolytic cell, that is, the leakage rate between the side where the barometer is provided and the external environment of the electrolytic cell.

[0081] Therefore, the electrolytic cell leakage rate determination method provided in this embodiment can determine both the internal and external seal leakage rates of the electrolytic cell.

[0082] After step 200, when it is necessary to further test the sealing of the electrolytic cell, the steps are as follows:

[0083] Step 321, drain at least part of the liquid.

[0084] Specifically, if further testing of the sealing and leakage location is required, the drain valve 61 is opened to discharge at least part of the liquid. At this time, the liquid level is not required to be higher than the alkali solution distribution hole. The liquid level in the electrolytic cell can also be lowered to below the alkali solution distribution hole on the electrolytic cell plate, for example, to discharge all the test liquid.

[0085] Step 322, opening the gas source 1, and opening the first on-off valve 31 and / or the second on-off valve 32, and the gas enters the electrolytic cell through the gas pipe;

[0086] Specifically, the third on-off valve 33 is opened to allow gas to flow into the pressure-stabilizing container 8. After a certain amount of gas is filled into the pressure-stabilizing container 8, the third on-off valve 33 is closed and the fourth on-off valve 34 is opened. When the liquid level in the electrolytic cell is still above the alkali solution distribution hole on the electrolytic cell plate after at least part of the liquid is discharged, the first on-off valve 31 and the second on-off valve 32 are opened at the same time, and the first pressure relief valve 41 and the second pressure relief valve 42 are kept in a closed state; when at least part of the liquid is discharged to lower the liquid level in the electrolytic cell to below the alkali solution distribution hole on the electrolytic cell plate, since the cathode side and the anode side of the electrolytic cell are connected, the first on-off valve 31 or the second on-off valve 32 can be opened, or the first on-off valve 31 and the second on-off valve 32 can be opened at the same time. Therefore, the gas entering the electrolytic cell fills the space outside the liquid in the electrolytic cell, and a certain pressure is applied to the liquid, so as to further detect the leakage position under pressure conditions, and the pressure can be not less than the working pressure of the electrolytic cell.

[0087] Step 323, using the ultrasonic detector 7 to detect whether there is gas leakage and determine the gas leakage location;

[0088] Specifically, the ultrasonic detector 7 is used to detect whether there is gas leakage at a position above the detection liquid level, and determine the specific leakage position.

[0089] The method may further include step 324, opening the pressure relief valve to exhaust the gas in the tank.

[0090] Specifically, the first pressure relief valve 41 and / or the second pressure relief valve 42 are opened to exhaust the gas in the electrolytic cell, and the experiment is terminated.

[0091] Therefore, the electrolytic cell sealing detection method provided in this embodiment injects a certain amount of alkaline solution, combines the liquid stain position and the ultrasonic detector to comprehensively judge the leakage position. If the leakage position is below the liquid level, it can be judged by the liquid stain position. If the leakage position is above the liquid level, it can be judged by the ultrasonic detector.

[0092] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0093] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A device for detecting the sealing performance of an electrolytic cell, characterized in that: include: Gas source, first gas pipeline, second gas pipeline, first on-off valve, second on-off valve, pressure relief valve and pressure gauge; The first gas supply pipe and the second gas supply pipe are connected in parallel to the gas source, the first gas supply pipe is used to supply gas to the anode of the electrolytic cell, and the second gas supply pipe is used to supply gas to the cathode of the electrolytic cell; The first on-off valve is disposed on the first gas pipeline, the second on-off valve is disposed on the second gas pipeline, the pressure relief valve is disposed on at least one of the first gas pipeline and the second gas pipeline, and the pressure gauge is disposed on at least the other of the first gas pipeline and the second gas pipeline; A liquid delivery component is connected to the cathode side and / or the anode side of the electrolytic cell and is used to deliver the detection liquid to the cathode side and / or the anode side of the electrolytic cell.

2. The electrolytic cell sealing detection device according to claim 1, characterized in that: The first gas pipeline and the second gas pipeline are each provided with a pressure relief valve and a pressure gauge, and the pressure relief valve is closer to the gas source than the pressure gauge.

3. The electrolytic cell sealing detection device according to claim 1, characterized in that: The electrolytic cell sealing detection device also includes an ultrasonic detector arranged at the periphery of the electrolytic cell, which is used to detect the gas leakage position of the electrolytic cell.

4. The electrolytic cell sealing detection device according to claim 1, characterized in that: The electrolytic cell sealing detection device also includes a pressure stabilizing container; The inlet of the pressure-stabilizing container is communicated with the gas source, and the outlet of the pressure-stabilizing container is communicated with the first gas pipeline and the second gas pipeline.

5. The electrolytic cell sealing detection device according to claim 4, characterized in that: The electrolytic cell sealing detection device further includes a third gas pipeline and a third on-off valve, wherein the third gas pipeline is arranged between the inlet of the pressure-stabilizing container and the gas source, and the third on-off valve is arranged on the third gas pipeline; And / or, the electrolytic cell sealing detection device also includes a fourth gas pipe and a fourth on-off valve, the fourth gas pipe is arranged between the outlet of the pressure-stabilizing container and the first gas pipe and the second gas pipe, and the fourth on-off valve is arranged on the fourth gas pipe.

6. A method for detecting the sealing performance of an electrolytic cell, characterized in that: Using the detection device according to any one of claims 1 to 5, the method comprises: Filling the electrolytic cell with the detection liquid through the liquid delivery assembly; After standing for a period of time, the electrolytic cell is inspected for liquid leakage and the location of the leakage.

7. The method according to claim 6, characterized in that The method is used to detect the internal seal leakage rate of the electrolytic cell. The step of detecting whether the electrolytic cell has liquid seepage and the location of the liquid seepage comprises: Discharging part of the liquid to a preset position, which is higher than the alkali solution distribution hole on the electrolytic cell plate; Open the gas source, and open the first on-off valve or the second on-off valve; When the gas enters the electrolytic cell and reaches a stable gas pressure state, the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell are recorded, and the first on-off valve or the second on-off valve is closed; Open the pressure relief valve on the second gas pipeline or the first gas pipeline and keep it open for a certain time. Record the absolute gas pressure p2 and the gas thermodynamic temperature T2 in the electrolytic cell at the end of the test. The time between the end of the test and the initial state is t. Calculate the leakage rate A according to the following formula:

8. The method according to claim 6, characterized in that The method is used to detect the leakage rate of the outer seal of the electrolytic cell. The step of detecting whether the electrolytic cell has liquid seepage and the location of the liquid seepage comprises: draining at least some of the fluid; Open the gas source, and open the first on-off valve and / or the second on-off valve; When the gas enters the electrolytic cell and reaches a stable gas pressure state, the initial absolute gas pressure p1 and the gas thermodynamic temperature T1 in the electrolytic cell are recorded, and the first on-off valve and / or the second on-off valve are closed; Keep it for a certain time, record the absolute pressure p2 and gas thermodynamic temperature T2 in the electrolytic cell at the end of the test, the time between the end of the test and the initial state is t, calculate the leakage rate A, according to the following formula:

9. The method according to claim 6, characterized in that The step of detecting whether the electrolytic cell has liquid seepage and the location of the liquid seepage comprises: draining at least some of the fluid; Open the gas source, and open the first on-off valve and / or the second on-off valve, so that the gas enters the electrolytic cell through the gas pipe; An ultrasonic detector is used to detect gas leakage and determine the location of the gas leakage.

10. The method according to claim 8 or 9, characterized in that: The discharge of at least part of the liquid is to lower the liquid level in the electrolytic cell to below the alkali solution distribution hole on the electrolytic cell plate.

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