Electrolytic bath pressure test platform and test method thereof

Abstract

The invention discloses an electrolytic bath pressure test platform and a test method thereof, belongs to the technical field of water electrolysis hydrogen production, and solves the problem of how to design a universal pressure test platform meeting different types of water electrolysis hydrogen production equipment. The electrolytic bath pressure test platform adopts the electrolyte circulation unit, the oxygen pressure control unit and the hydrogen pressure control unit to perform pressure control and electrolyte circulation on the electrolytic bath, is suitable for pressure regulation requirements of different types of electrolytic baths, and can be matched with corresponding pressure test methods according to characteristics of the electrolytic bath; an oxygen / hydrogen side loop is independently arranged, different types of electrolytic bath anode or cathode isobaric and differential pressure control is achieved through a back pressure valve, oxygen / hydrogen is discharged after passing through a separator after being output through the electrolytic bath, the pressure test platform system is high in integration degree, and the comprehensive test capacity is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and relates to an electrolytic cell pressure testing platform and a testing method thereof. Background Art

[0002] At present, the technologies for preparing elemental hydrogen mainly include hydrogen production from fossil energy reforming, hydrogen production from industrial by-product gas, and hydrogen production from water electrolysis. With the continuous development of related technologies such as catalyst preparation, plate surface treatment, and electrolytic cell structure optimization, hydrogen production from water electrolysis will surely become the development direction of the future energy industry. According to the different materials of the electrolytic cell diaphragm, hydrogen production from water electrolysis at room temperature is usually divided into alkaline water hydrogen production (ALK), proton exchange membrane hydrogen production (PEM), and anion exchange membrane hydrogen production (AEM).

[0003] At present, the production of hydrogen by electrolysis of water is developing in the direction of higher temperature and higher pressure. As the system pressure increases, higher requirements are placed on the pressure control on both sides of the anode and cathode of the electrolyzer. Alkaline electrolyzers are difficult to shut down or start quickly, and the hydrogen production rate is difficult to adjust quickly, because the pressure on the anode and cathode sides of the electrolyzer must be kept balanced at all times to prevent hydrogen and oxygen gases from mixing through the porous diaphragm and causing an explosion. Proton exchange membranes and anion exchange membranes are currently developing in the direction of high pressure difference, but the pressure equalization and differential pressure control on both sides of the anode and cathode are achieved, which is more demanding for the pressure control of the electrolyzer test system. At present, the domestic focus is mainly on the hydrogen production energy consumption and gas production efficiency of the electrolyzer, and there is little research on the anode and cathode pressure control strategy of the electrolyzer under complex working conditions.

[0004] In the prior art, the Chinese invention patent document "A water electrolysis hydrogen production equipment and its control method" with application publication number CN117248220A adopts a dual circulation liquid supply method of anode and cathode to provide electrolyte to the electrolyzer, thereby realizing independent temperature and flow control of anode and cathode. The above document mainly builds an AEM hydrogen production system based on water electrolysis hydrogen production technology, realizing independent circulation liquid supply and pressure balance control of anode and cathode, but it is not compatible with the operating conditions and pressure control requirements of ALK or PEM electrolyzers. Therefore, meeting the pressure control requirements of different types of water electrolysis hydrogen production equipment (including PEM, AEM, ALK electrolyzers) and being applicable to the testing requirements under various complex working conditions are currently urgent problems to be solved. Summary of the invention

[0005] The technical solution of the present invention is used to solve the problem of how to design a universal pressure testing platform that meets the needs of different types of water electrolysis hydrogen production equipment.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides an electrolytic cell pressure test platform, comprising: an electrolytic cell (1), a first separator (2), a second separator (3), a first washer (4), a second washer (5), a first circulating pump (6), a second circulating pump (7), a first flow meter (8), a second flow meter (9), a first diaphragm back pressure valve (10), a second diaphragm back pressure valve (11), a first pressure sensor (12), a second pressure sensor (13), a third pressure sensor (14), a fourth pressure sensor (15), a fifth pressure sensor (16), a sixth pressure sensor (17), a first three-way air-controlled valve (22), a second three-way air-controlled valve (23), a pneumatic switch valve (24), a first manual valve (25), a second manual valve (26), a third manual valve (27), a fourth manual valve (28), and a fifth manual valve (29);

[0008] The output end of the second manual valve (26), one end of the third manual valve (27), the other end of the third manual valve (27), and the output end of the fourth manual valve (28) are connected in series and sealed in sequence; a pipe is led out between the output end of the second manual valve (26) and one end of the third manual valve (27) and is sealedly connected to the anode inlet of the electrolytic cell (1); a pipe is led out between the other end of the third manual valve (27) and the output end of the fourth manual valve (28) and is sealedly connected to the cathode inlet of the electrolytic cell (1); one end of the pneumatic switch valve (24) is sealedly connected to one end of the first manual valve (25); the other end of the first manual valve (25) is sealedly connected to the input end of the first circulation pump (6); the output end of the first circulation pump (6) is sealedly connected to the input end of the first flow meter (8). The output end of the first flow meter (8) is sealedly connected to the input end of the second manual valve (26); the other end of the pneumatic switch valve (24) is sealedly connected to one end of the fifth manual valve (29), the other end of the fifth manual valve (29) is sealedly connected to the input end of the second circulation pump (7), the output end of the second circulation pump (7) is sealedly connected to the input end of the second flow meter (9), and the output end of the second flow meter (9) is sealedly connected to the input end of the fourth manual valve (28); the first pressure sensor (12) is sealedly installed on the pipeline between the output end of the first flow meter (8) and the input end of the second manual valve (26); the second pressure sensor (13) is sealedly installed on the pipeline between the output end of the second flow meter (9) and the input end of the fourth manual valve (28);

[0009] The anode outlet of the electrolytic cell (1) is sealedly connected to the inlet of the first separator (2); the third pressure sensor (14) is sealedly installed on the pipeline between the anode outlet of the electrolytic cell (1) and the inlet of the first separator (2); the first outlet of the first separator (2) is sealedly connected to the pipeline between the pneumatic switch valve (24) and the first manual valve (25); the second outlet of the first separator (2) is sealedly connected to the inlet of the first three-way air-controlled valve (22); the first outlet of the first three-way air-controlled valve (22) is sealedly connected to one end of the first diaphragm back-pressure valve (10); the other end of the first diaphragm back-pressure valve (10) serves as an oxygen venting end; the second outlet of the first three-way air-controlled valve (22) is sealedly connected to the inlet of the first scrubber (4); the outlet of the first scrubber (4) is sealedly connected to the pipeline between the first diaphragm back-pressure valve (10) and the first outlet of the first three-way air-controlled valve (22); and the fifth pressure sensor (16) is sealedly installed on the upper part of the first separator (2);

[0010] The cathode outlet of the electrolytic cell (1) is sealedly connected to the inlet of the second separator (3); the fourth pressure sensor (15) is sealedly installed on the pipeline between the cathode outlet of the electrolytic cell (1) and the inlet of the second separator (3); the first outlet of the second separator (3) is sealedly connected to the pipeline between the pneumatic switch valve (24) and the fifth manual valve (29); the second outlet of the second separator (3) is sealedly connected to the inlet of the second three-way air-controlled valve (23); the first outlet of the second three-way air-controlled valve (23) is sealedly connected to one end of the second diaphragm back-pressure valve (11); the other end of the second diaphragm back-pressure valve (11) serves as a hydrogen venting end; the second outlet of the second three-way air-controlled valve (23) is sealedly connected to the inlet of the second scrubber (5); the outlet of the second scrubber (5) is sealedly connected to the pipeline between the second diaphragm back-pressure valve (11) and the first outlet of the second three-way air-controlled valve (23); and the sixth pressure sensor (17) is sealedly installed on the upper part of the second separator (3).

[0011] Furthermore, the electrolytic cell pressure testing platform further comprises: a seventh pressure sensor (18) and an eighth pressure sensor (19); the seventh pressure sensor (18) is sealed and installed on the upper part of the first washer (4); and the eighth pressure sensor (19) is sealed and installed on the upper part of the second washer (5).

[0012] Furthermore, the electrolytic cell pressure test platform further comprises: a first liquid level sensor (20) and a second liquid level sensor (21); one end of the first liquid level sensor (20) is sealed and installed in the middle of the first separator (2), and the other end of the first liquid level sensor (20) is sealed and installed at the bottom of the first separator (2); one end of the second liquid level sensor (21) is sealed and installed in the middle of the second separator (3), and the other end of the second liquid level sensor (21) is sealed and installed at the bottom of the second separator (3).

[0013] Preferably, the electrolyzer (1) is any one of a proton exchange membrane (PEM) electrolyzer, an alkaline (ALK) electrolyzer or an anion exchange membrane (AEM).

[0014] The present invention also provides a method for performing isobaric testing of a PEM electrolyzer using the electrolyzer pressure testing platform, comprising the following steps:

[0015] 1) Anode electrolyte circulation: switch the electrolytic cell pressure test platform to the PEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to the outlet 1, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the anode inlet of the electrolytic cell (1) form an electrolyte circulation loop;

[0016] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2);

[0017] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3);

[0018] 4) Isobaric regulation: Regulate the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0019] The present invention also provides a method for performing a PEM electrolyzer differential pressure test using the electrolyzer pressure test platform, comprising the following steps:

[0020] 1) Anode electrolyte circulation: switch the electrolytic cell pressure test platform to the PEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to the outlet 1, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the anode inlet of the electrolytic cell (1) form an electrolyte circulation loop;

[0021] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2);

[0022] 3) Cathode back pressure control: The hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0023] The present invention also provides a method for performing an isobaric test of an AEM electrolytic cell using the above electrolytic cell pressure test platform, comprising the following steps:

[0024] 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, open the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 5)→first circulation pump (6)→first flow meter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; the fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are also in an open state, at which time the cathode outlet of electrolytic cell (1)→the fourth pressure sensor (15)→the second separator (3)→the fifth manual valve (29)→the second circulation pump (7)→the second flow meter (9)→the second pressure sensor (13)→the fourth manual valve (28)→the cathode inlet of electrolytic cell (1) to form another electrolyte circulation loop;

[0025] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2);

[0026] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3);

[0027] 4) Isobaric regulation: The first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) are regulated so that the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0028] The present invention also provides a method for performing differential pressure testing of an AEM electrolytic cell using the electrolytic cell pressure testing platform, comprising the following steps:

[0029] 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 5)→first circulation pump (6)→first flow meter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; the fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are also in an open state, at which time the cathode outlet of electrolytic cell (1)→the fourth pressure sensor (15)→the second separator (3)→the fifth manual valve (29)→the second circulation pump (7)→the second flow meter (9)→the second pressure sensor (13)→the fourth manual valve (28)→the cathode inlet of electrolytic cell (1) to form another electrolyte circulation loop;

[0030] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2);

[0031] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0032] The present invention also provides a method for performing an isobaric test of an ALK electrolytic cell using the electrolytic cell pressure test platform, comprising the following steps:

[0033] 1) Anode electrolyte mixing circulation: switch the electrolytic cell pressure test platform to ALK test mode, open the pneumatic switch valve (24), open the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air control valve (22) and the second three-way air control valve (23) to outlet 2, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) )→first separator (2)→first manual valve (25)→first circulation pump (6)→first flowmeter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; in the ALK test mode, the alkali concentration of the electrolyte is high, the third manual valve (27) is opened, and the circulating electrolyte flowing out of the first circulation pump (6) is divided into two paths, one path enters the anode inlet of the electrolytic cell (1), and the other path enters the cathode inlet of the electrolytic cell (1), so that the electrolyte concentrations of the anode and cathode of the electrolytic cell (1) can be consistent;

[0034] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2);

[0035] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3);

[0036] 4) Isobaric regulation: The first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) are regulated so that the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0037] The advantages of the present invention are:

[0038] 1) The present invention builds a comprehensive electrolyzer pressure testing platform to meet the pressure regulation test requirements of different types of electrolyzers (PEM, AEM, ALK);

[0039] 2) The present invention can realize automatic independent back pressure control of hydrogen / oxygen, and meet the requirements of equal pressure and differential pressure control of anode and cathode in the range of normal pressure to high pressure;

[0040] 3) The present invention adopts different pressure testing methods according to the characteristics of the electrolytic cell, and adopts multi-stage pressure regulation for the electrolytic cell that is sensitive to pressure difference, thereby ensuring the pressure regulation accuracy;

[0041] 4) The pressure testing platform of the present invention has high system integration and greatly improved comprehensive testing capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of an electrolytic cell pressure testing platform according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0045] Embodiment 1

[0046] like Figure 1 As shown, an electrolytic cell pressure test platform provided by an embodiment of the present invention comprises: an electrolytic cell (1), an electrolyte circulation unit, an oxygen pressure control unit, and a hydrogen pressure control unit; the electrolyte circulation unit provides electrolyte for the electrolytic cell, including an anolyte circulation and a cathode electrolyte circulation; the anolyte circulation is the electrolyte flowing out of the anode separator being circulated by the anolyte circulation pump; the cathode electrolyte circulation is the electrolyte flowing out of the cathode separator being circulated by the cathode electrolyte circulation pump; the oxygen pressure control unit is used to produce oxygen from the anode outlet and entrain the electrolyte during the operation of the electrolytic cell, and enter the anode separator. The separator is used for dehydration, and then the anode side pressure is adjusted by the back pressure valve, and finally the oxygen is discharged; if it is the AEM test mode or the ALK test mode, the oxygen is separated from the steam and water, and then enters the gas scrubber to clean the trace alkaline solution carried; the hydrogen pressure control unit produces oxygen and entrains electrolyte from the cathode outlet during the operation of the electrolyzer, and enters the cathode separator for dehydration, and the hydrogen out of the separator is adjusted by the back pressure valve on the cathode side, and finally the hydrogen is discharged; if it is the AEM test mode or the ALK test mode, the hydrogen is separated from the steam and water, and then enters the gas scrubber to clean the trace alkaline solution carried.

[0047] The electrolyzer (1) can be any one of a proton exchange membrane (PEM) electrolyzer, an alkaline (ALK) electrolyzer or an anion exchange membrane (AEM).

[0048] The electrolyte circulation unit comprises: a first circulation pump (6), a second circulation pump (7), a first flow meter (8), a second flow meter (9), a first pressure sensor (12), a second pressure sensor (13), a pneumatic switch valve (24), a first manual valve (25), a second manual valve (26), a third manual valve (27), a fourth manual valve (28), and a fifth manual valve (29); the pneumatic switch valve (24) is used to balance the pressure on both sides of the cathode and anode and the electrolyte concentration in the AEM test mode or the ALK isobaric test mode.

[0049] The oxygen pressure control unit comprises: a first separator (2), a first scrubber (4), a first diaphragm back pressure valve (10), a third pressure sensor (14), a fifth pressure sensor (16), a seventh pressure sensor (18), a first liquid level sensor (20), and a first three-way air control valve (22).

[0050] The hydrogen pressure control unit comprises: a second separator (3), a second scrubber (5), a second diaphragm back pressure valve (11), a fourth pressure sensor (15), a sixth pressure sensor (17), an eighth pressure sensor (19), a second liquid level sensor (21), and a second three-way gas control valve (23).

[0051] The output end of the second manual valve (26), one end of the third manual valve (27), the other end of the third manual valve (27), and the output end of the fourth manual valve (28) are connected in series and sealed via pipelines in sequence; a pipeline is led out between the output end of the second manual valve (26) and one end of the third manual valve (27) and is sealedly connected to the anode inlet of the electrolytic cell (1); a pipeline is led out between the other end of the third manual valve (27) and the output end of the fourth manual valve (28) and is sealedly connected to the cathode inlet of the electrolytic cell (1); one end of the pneumatic switch valve (24) is sealedly connected to one end of the first manual valve (25) via a pipeline; the other end of the first manual valve (25) is sealedly connected to the input end of the first circulation pump (6) via a pipeline; the output end of the first circulation pump (6) is sealedly connected to the input end of the first flow meter (8) via a pipeline. The output end of the first flow meter (8) is sealedly connected to the input end of the second manual valve (26) through a pipeline; the other end of the pneumatic switch valve (24) is sealedly connected to one end of the fifth manual valve (29) through a pipeline; the other end of the fifth manual valve (29) is sealedly connected to the input end of the second circulation pump (7) through a pipeline; the output end of the second circulation pump (7) is sealedly connected to the input end of the second flow meter (9) through a pipeline; the output end of the second flow meter (9) is sealedly connected to the input end of the fourth manual valve (28) through a pipeline; the first pressure sensor (12) is sealedly installed on the pipeline between the output end of the first flow meter (8) and the input end of the second manual valve (26); the second pressure sensor (13) is sealedly installed on the pipeline between the output end of the second flow meter (9) and the input end of the fourth manual valve (28).

[0052] The anode outlet of the electrolytic cell (1) is sealedly connected to the inlet of the first separator (2) via a pipeline, the third pressure sensor (14) is sealedly installed on the pipeline between the anode outlet of the electrolytic cell (1) and the inlet of the first separator (2), the first outlet of the first separator (2) is sealedly connected to the pipeline between the pneumatic switch valve (24) and the first manual valve (25) via a pipeline, the second outlet of the first separator (2) is sealedly connected to the inlet of the first three-way air-controlled valve (22) via a pipeline, the first outlet of the first three-way air-controlled valve (22) is sealedly connected to one end of the first diaphragm back-pressure valve (10) via a pipeline, and the other end of the first diaphragm back-pressure valve (10) is sealed to the inlet of the first three-way air-controlled valve (22). The end is used as an oxygen venting end, the second outlet of the first three-way air control valve (22) is sealed and connected to the inlet of the first scrubber (4) through a pipeline, the outlet of the first scrubber (4) is sealed and connected to the pipeline between the first diaphragm back pressure valve (10) and the first outlet of the first three-way air control valve (22) through a pipeline, the fifth pressure sensor (16) is sealed and installed on the upper part of the first separator (2), one end of the first liquid level sensor (20) is sealed and installed in the middle part of the first separator (2), the other end of the first liquid level sensor (20) is sealed and installed at the bottom of the first separator (2), and the seventh pressure sensor (18) is sealed and installed on the upper part of the first scrubber (4).

[0053] The cathode outlet of the electrolytic cell (1) is sealed and connected to the inlet of the second separator (3) via a pipeline; the fourth pressure sensor (15) is sealed and installed on the pipeline between the cathode outlet of the electrolytic cell (1) and the inlet of the second separator (3); the first outlet of the second separator (3) is sealed and connected to the pipeline between the pneumatic switch valve (24) and the fifth manual valve (29) via a pipeline; the second outlet of the second separator (3) is sealed and connected to the inlet of the second three-way air-controlled valve (23) via a pipeline; the first outlet of the second three-way air-controlled valve (23) is sealed and connected to one end of the second diaphragm back-pressure valve (11) via a pipeline; the other end of the second diaphragm back-pressure valve (11) is sealed and connected to the inlet of the second three-way air-controlled valve (23); The end is used as a hydrogen venting end, the second outlet of the second three-way gas control valve (23) is sealed and connected to the inlet of the second scrubber (5) through a pipeline, the outlet of the second scrubber (5) is sealed and connected to the pipeline between the second diaphragm back pressure valve (11) and the first outlet of the second three-way gas control valve (23) through a pipeline, the sixth pressure sensor (17) is sealed and installed on the upper part of the second separator (3), one end of the second liquid level sensor (21) is sealed and installed in the middle part of the second separator (3), the other end of the second liquid level sensor (21) is sealed and installed at the bottom of the second separator (3), and the eighth pressure sensor (19) is sealed and installed on the upper part of the second scrubber (5).

[0054] Embodiment 2

[0055] The method for performing a PEM electrolyzer pressure regulation test using the electrolyzer pressure test platform in Example 1 is as follows:

[0056] 1. PEM electrolyzer isobaric test

[0057] During the isobaric test of the PEM electrolyzer, the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range; the specific control method is as follows:

[0058] 1) Anode electrolyte circulation: the electrolytic cell pressure test platform is switched to the PEM test mode, the pneumatic switch valve (24) is closed, the third manual valve (27) is closed, the first manual valve (25) and the second manual valve (26) are opened, the fourth manual valve (28) and the fifth manual valve (29) are closed, the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) are switched to the outlet 1, the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state, and at this time, the electrolytic cell (1) anode outlet → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the electrolytic cell (1) anode inlet forms an electrolyte circulation loop.

[0059] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2).

[0060] 3) Cathode back pressure control: The hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0061] 4) Isobaric regulation: Regulate the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P inside the first separator (2) is 1Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0062] 2. PEM electrolyzer differential pressure test

[0063] During the differential pressure test of the PEM electrolyzer, the pressure P inside the first separator (2) 1 It does not need to be equal to the pressure P inside the second separator (3) 2 ; The specific control methods are as follows:

[0064] 1) Anode electrolyte circulation: the electrolytic cell pressure test platform is switched to the PEM test mode, the pneumatic switch valve (24) is closed, the third manual valve (27) is closed, the first manual valve (25) and the second manual valve (26) are opened, the fourth manual valve (28) and the fifth manual valve (29) are closed, the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) are switched to the outlet 1, the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state, and at this time, the electrolytic cell (1) anode outlet → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the electrolytic cell (1) anode inlet forms an electrolyte circulation loop.

[0065] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2).

[0066] 3) Cathode back pressure control: The hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0067] Embodiment 3

[0068] The method for performing the AEM electrolytic cell pressure regulation test using the electrolytic cell pressure test platform in Example 1 is as follows:

[0069] 1. AEM electrolyzer isobaric test

[0070] During the isobaric test of the AEM electrolyzer, the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range; the specific control method is as follows:

[0071] 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, open the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 The fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are all in an open state. At this time, the cathode outlet of the electrolytic cell (1) → the fourth pressure sensor (15) → the second separator (3) → the fifth manual valve (29) → the second circulation pump (7) → the second flow meter (9) → the second pressure sensor (13) → the fourth manual valve (28) → the cathode inlet of the electrolytic cell (1) forms another electrolyte circulation loop.

[0072] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2).

[0073] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0074] 4) Isobaric regulation: Regulate the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0075] 2. AEM electrolyzer differential pressure test

[0076] During the differential pressure test of the AEM electrolyzer, the pressure P inside the first separator (2) 1 It does not need to be equal to the pressure P inside the second separator (3) 2 ; The specific control methods are as follows:

[0077] 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 The fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are all in an open state. At this time, the cathode outlet of the electrolytic cell (1) → the fourth pressure sensor (15) → the second separator (3) → the fifth manual valve (29) → the second circulation pump (7) → the second flow meter (9) → the second pressure sensor (13) → the fourth manual valve (28) → the cathode inlet of the electrolytic cell (1) forms another electrolyte circulation loop.

[0078] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2).

[0079] 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0080] Embodiment 4

[0081] The method for performing the ALK electrolytic cell pressure regulation test using the electrolytic cell pressure test platform in Example 1 is as follows:

[0082] 1. ALK electrolyzer isobaric test

[0083] During the isobaric test of the ALK electrolyzer, the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range; the specific control method is as follows:

[0084] 1) Anode electrolyte mixing circulation: switch the electrolytic cell pressure test platform to ALK test mode, open the pneumatic switch valve (24), open the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air control valve (22) and the second three-way air control valve (23) to outlet 2, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) )→first separator (2)→first manual valve (25)→first circulation pump (6)→first flow meter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; in the ALK test mode, the alkali concentration of the electrolyte is high, the third manual valve (27) is opened, and the circulating electrolyte flowing out of the first circulation pump (6) is divided into two paths, one path enters the anode inlet of the electrolytic cell (1), and the other path enters the cathode inlet of the electrolytic cell (1), so that the electrolyte concentrations of the anode and cathode of the electrolytic cell (1) can be consistent.

[0085] 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2).

[0086] 3) Cathode back pressure control: The hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

[0087] 4) Isobaric regulation: Regulate the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P inside the first separator (2) is 1 Equal to the pressure P inside the second separator (3) 2 , or the pressure P inside the first separator (2) 1 The pressure P inside the second separator (3) 2 The difference between them is within the threshold range.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolytic cell pressure testing platform, characterized in that: include: Electrolyzer (1), a first separator (2), a second separator (3), a first washer (4), a second washer (5), a first circulation pump (6), a second circulation pump (7), a first flow meter (8), a second flow meter (9), a first diaphragm back pressure valve (10), a second diaphragm back pressure valve (11), a first pressure sensor (12), a second pressure sensor (13), a third pressure sensor (14), a fourth pressure sensor (15), a fifth pressure sensor (16), a sixth pressure sensor (17), a first three-way air-controlled valve (22), a second three-way air-controlled valve (23), a pneumatic switch valve (24), a first manual valve (25), a second manual valve (26), a third manual valve (27), a fourth manual valve (28), and a fifth manual valve (29); The output end of the second manual valve (26), one end of the third manual valve (27), the other end of the third manual valve (27), and the output end of the fourth manual valve (28) are connected in series and sealed in sequence; a pipe is led out between the output end of the second manual valve (26) and one end of the third manual valve (27) and is sealedly connected to the anode inlet of the electrolytic cell (1); a pipe is led out between the other end of the third manual valve (27) and the output end of the fourth manual valve (28) and is sealedly connected to the cathode inlet of the electrolytic cell (1); one end of the pneumatic switch valve (24) is sealedly connected to one end of the first manual valve (25); the other end of the first manual valve (25) is sealedly connected to the input end of the first circulation pump (6); the output end of the first circulation pump (6) is sealedly connected to the input end of the first flow meter (8). The output end of the first flow meter (8) is sealedly connected to the input end of the second manual valve (26); the other end of the pneumatic switch valve (24) is sealedly connected to one end of the fifth manual valve (29), the other end of the fifth manual valve (29) is sealedly connected to the input end of the second circulation pump (7), the output end of the second circulation pump (7) is sealedly connected to the input end of the second flow meter (9), and the output end of the second flow meter (9) is sealedly connected to the input end of the fourth manual valve (28); the first pressure sensor (12) is sealedly installed on the pipeline between the output end of the first flow meter (8) and the input end of the second manual valve (26); the second pressure sensor (13) is sealedly installed on the pipeline between the output end of the second flow meter (9) and the input end of the fourth manual valve (28); The anode outlet of the electrolytic cell (1) is sealedly connected to the inlet of the first separator (2); the third pressure sensor (14) is sealedly installed on the pipeline between the anode outlet of the electrolytic cell (1) and the inlet of the first separator (2); the first outlet of the first separator (2) is sealedly connected to the pipeline between the pneumatic switch valve (24) and the first manual valve (25); the second outlet of the first separator (2) is sealedly connected to the inlet of the first three-way air-controlled valve (22); the first outlet of the first three-way air-controlled valve (22) is sealedly connected to one end of the first diaphragm back-pressure valve (10); the other end of the first diaphragm back-pressure valve (10) serves as an oxygen venting end; the second outlet of the first three-way air-controlled valve (22) is sealedly connected to the inlet of the first scrubber (4); the outlet of the first scrubber (4) is sealedly connected to the pipeline between the first diaphragm back-pressure valve (10) and the first outlet of the first three-way air-controlled valve (22); and the fifth pressure sensor (16) is sealedly installed on the upper part of the first separator (2); The cathode outlet of the electrolytic cell (1) is sealedly connected to the inlet of the second separator (3); the fourth pressure sensor (15) is sealedly installed on the pipeline between the cathode outlet of the electrolytic cell (1) and the inlet of the second separator (3); the first outlet of the second separator (3) is sealedly connected to the pipeline between the pneumatic switch valve (24) and the fifth manual valve (29); the second outlet of the second separator (3) is sealedly connected to the inlet of the second three-way air-controlled valve (23); the first outlet of the second three-way air-controlled valve (23) is sealedly connected to one end of the second diaphragm back-pressure valve (11); the other end of the second diaphragm back-pressure valve (11) serves as a hydrogen venting end; the second outlet of the second three-way air-controlled valve (23) is sealedly connected to the inlet of the second scrubber (5); the outlet of the second scrubber (5) is sealedly connected to the pipeline between the second diaphragm back-pressure valve (11) and the first outlet of the second three-way air-controlled valve (23); and the sixth pressure sensor (17) is sealedly installed on the upper part of the second separator (3).

2. The electrolytic cell pressure testing platform according to claim 1, characterized in that: Also includes: A seventh pressure sensor (18) and an eighth pressure sensor (19); the seventh pressure sensor (18) is sealed and installed on the upper part of the first washer (4); and the eighth pressure sensor (19) is sealed and installed on the upper part of the second washer (5).

3. The electrolytic cell pressure testing platform according to claim 1, characterized in that: Also includes: A first liquid level sensor (20) and a second liquid level sensor (21); one end of the first liquid level sensor (20) is sealed and installed in the middle of the first separator (2), and the other end of the first liquid level sensor (20) is sealed and installed at the bottom of the first separator (2); one end of the second liquid level sensor (21) is sealed and installed in the middle of the second separator (3), and the other end of the second liquid level sensor (21) is sealed and installed at the bottom of the second separator (3).

4. The electrolytic cell pressure testing platform according to claim 1, characterized in that: The electrolyzer (1) is any one of a proton exchange membrane (PEM) electrolyzer, an alkaline (ALK) electrolyzer or an anion exchange membrane (AEM).

5. A method for performing isobaric testing of a PEM electrolyzer using the electrolyzer pressure testing platform according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Anode electrolyte circulation: switch the electrolytic cell pressure test platform to the PEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to the outlet 1, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the anode inlet of the electrolytic cell (1) form an electrolyte circulation loop; 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2); 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3); 4) Isobaric regulation: adjusting the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P1 inside the first separator (2) is equal to the pressure P2 inside the second separator (3), or the difference between the pressure P1 inside the first separator (2) and the pressure P2 inside the second separator (3) is within a threshold range.

6. A method for performing a PEM electrolyzer differential pressure test using the electrolyzer pressure test platform according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Anode electrolyte circulation: switch the electrolytic cell pressure test platform to the PEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to the outlet 1, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (25) → the first circulation pump (6) → the first flow meter (8) → the first pressure sensor (12) → the second manual valve (26) → the anode inlet of the electrolytic cell (1) form an electrolyte circulation loop; 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2); 3) Cathode back pressure control: The hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

7. A method for performing isobaric testing of an AEM electrolytic cell using the electrolytic cell pressure testing platform according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, open the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 5)→first circulation pump (6)→first flow meter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; the fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are also in an open state, at which time the cathode outlet of electrolytic cell (1)→the fourth pressure sensor (15)→the second separator (3)→the fifth manual valve (29)→the second circulation pump (7)→the second flow meter (9)→the second pressure sensor (13)→the fourth manual valve (28)→the cathode inlet of electrolytic cell (1) to form another electrolyte circulation loop; 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2); 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3); 4) Isobaric regulation: adjusting the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P1 inside the first separator (2) is equal to the pressure P2 inside the second separator (3), or the difference between the pressure P1 inside the first separator (2) and the pressure P2 inside the second separator (3) is within a threshold range.

8. A method for performing differential pressure testing of an AEM electrolytic cell using the electrolytic cell pressure testing platform according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Anode and cathode electrolyte circulation: switch the electrolytic cell pressure test platform to the AEM test mode, close the pneumatic switch valve (24), close the third manual valve (27), open the first manual valve (25), the second manual valve (26), the fourth manual valve (28), and the fifth manual valve (29), and switch the first three-way air-controlled valve (22) and the second three-way air-controlled valve (23) to outlet 2; the first manual valve (25), the second manual valve (26), and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) → the first separator (2) → the first manual valve (2 5)→first circulation pump (6)→first flow meter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; the fourth manual valve (28), the fifth manual valve (29) and the second circulation pump (7) are also in an open state, at which time the cathode outlet of electrolytic cell (1)→the fourth pressure sensor (15)→the second separator (3)→the fifth manual valve (29)→the second circulation pump (7)→the second flow meter (9)→the second pressure sensor (13)→the fourth manual valve (28)→the cathode inlet of electrolytic cell (1) to form another electrolyte circulation loop; 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2); 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), and the electrolyte flowing out of the cathode outlet of the electrolytic cell (1) is circulated through the second circulation pump (7), and the flow rate of the second circulation pump (7) is adjusted according to the feedback signal of the second flow meter (9); the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), and the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3).

9. A method for performing an ALK electrolytic cell isobaric test using the electrolytic cell pressure test platform according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Anode electrolyte mixing circulation: switch the electrolytic cell pressure test platform to ALK test mode, open the pneumatic switch valve (24), open the third manual valve (27), open the first manual valve (25) and the second manual valve (26), close the fourth manual valve (28) and the fifth manual valve (29), switch the first three-way air control valve (22) and the second three-way air control valve (23) to outlet 2, and the first manual valve (25), the second manual valve (26) and the first circulation pump (6) are all in the open state. At this time, the anode outlet of the electrolytic cell (1) → the third pressure sensor (14) )→first separator (2)→first manual valve (25)→first circulation pump (6)→first flowmeter (8)→first pressure sensor (12)→second manual valve (26)→anode inlet of electrolytic cell (1) to form an electrolyte circulation loop; in the ALK test mode, the alkali concentration of the electrolyte is high, the third manual valve (27) is opened, and the circulating electrolyte flowing out of the first circulation pump (6) is divided into two paths, one path enters the anode inlet of the electrolytic cell (1), and the other path enters the cathode inlet of the electrolytic cell (1), so that the electrolyte concentrations of the anode and cathode of the electrolytic cell (1) can be consistent; 2) Anode back pressure control: oxygen generated at the anode outlet of the electrolytic cell (1) is charged into the first separator (2), and the electrolyte flowing out of the anode outlet of the electrolytic cell (1) is circulated through the first circulation pump (6), and the flow rate of the first circulation pump (6) is adjusted according to the feedback signal of the first flow meter (8); the third pressure sensor (14) monitors the gas pressure at the anode outlet of the electrolytic cell (1), and the fifth pressure sensor (16) monitors the pressure inside the first separator (2) in real time, and feeds back the pressure signal to the first diaphragm back pressure valve (10) in real time, and the first diaphragm back pressure valve (10) controls the pressure inside the first separator (2); 3) Cathode back pressure control: hydrogen generated at the cathode outlet of the electrolytic cell (1) is charged into the second separator (3), the fourth pressure sensor (15) monitors the gas pressure at the cathode outlet of the electrolytic cell (1), the sixth pressure sensor (17) monitors the pressure inside the second separator (3) in real time, and feeds back the pressure signal to the second diaphragm back pressure valve (11) in real time, and the second diaphragm back pressure valve (11) controls the pressure inside the second separator (3); 4) Isobaric regulation: adjusting the first diaphragm back pressure valve (10) and the second diaphragm back pressure valve (11) so that the pressure P1 inside the first separator (2) is equal to the pressure P2 inside the second separator (3), or the difference between the pressure P1 inside the first separator (2) and the pressure P2 inside the second separator (3) is within a threshold range.

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