PEM membrane electrode testing system capable of realizing online purification and conductivity monitoring

Abstract

The invention belongs to the technical field of electrochemistry, and discloses a PEM membrane electrode testing system capable of realizing online purification and conductivity monitoring. The structure is as follows: a test fixture is provided with three lines which are respectively connected with a water storage tank, an oxygen-water separation tank and a hydrogen-water separation tank, the water storage tank is additionally provided with a circulating line, the circulating line is sequentially provided with a conductivity meter, a circulating pump a and a deionization filter, and a PEM electrolytic bath is clamped in the test fixture. Through the design of the circulating water path control flow, online purification and real-time monitoring of the conductivity of the circulating water are realized, so that the conductivity of the circulating water is ensured to meet the test requirements of the PEM membrane electrode.

Description

Technical Field

[0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a PEM membrane electrode testing system capable of online purification and conductivity monitoring. Background Art

[0002] PEM membrane electrode is the core component of water electrolysis hydrogen production technology. The testing of PEM membrane electrode is extremely important for the research and development, performance evaluation and improvement of membrane electrode. However, PEM membrane electrode has extremely high requirements for water purity. How to ensure the conductivity value of circulating water in the process of circulating hydrogen production is the key to accurately evaluate the performance of membrane electrode. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a PEM membrane electrode testing system that can perform online purification and conductivity monitoring. Through the design of the circulating water circuit control process, online purification of circulating water and real-time conductivity monitoring are achieved, thereby ensuring that the conductivity of the circulating water meets the testing requirements of the PEM membrane electrode, avoiding the influence of water quality factors on the test results of the membrane electrode, and ensuring that the test results are objective, correct and accurate.

[0004] The above-mentioned object of the present invention is achieved through the following technical scheme: a PEM membrane electrode test system capable of online purification and conductivity monitoring, the structure of which is as follows: three lines are provided on the test fixture, which are respectively connected to a water storage tank, an oxygen-water separation tank, and a hydrogen-water separation tank. A circulation line is also provided on the water storage tank, and a conductivity meter, a circulation pump a, and a deionizing filter are sequentially provided on the circulation line. A PEM electrolyzer is clamped in the test fixture.

[0005] The water storage tank is used to store the water required for electrolysis, the oxygen-water separation tank and the hydrogen-water separation tank are used to decompose the hydrogen and oxygen produced by ionization, the test fixture is used to fix and connect the PEM electrolyzer, the PEM electrolyzer is a container for the PEM membrane electrode and the catalyst to carry out the electrolysis reaction, the conductivity meter is used to monitor the conductivity, the deionization filter is used to purify the water used for electrolysis, and the circulation pump a is used to provide power for the line circulation.

[0006] Furthermore, the line between the water storage tank and the test fixture is provided with valve a, circulation pump b, flow meter, pipeline electric heater, and temperature controller in sequence, wherein valve a is used to control the line switch, the circulation pump is used to provide power for the line circulation, the flow meter is used to monitor the water flow, the pipeline electric heater is used to heat the temperature of the water flow, and the temperature controller is used to control the temperature of the water flow.

[0007] Furthermore, the oxygen-water separation tank is also provided with an oxygen outlet, an upper liquid level gauge a, and a lower liquid level gauge a, and a pressure gauge a and a valve b are sequentially provided between the oxygen-water separation tank and the oxygen outlet. The valve b is used to control the circuit switch, the oxygen outlet is used to discharge the separated oxygen, the pressure gauge a is used to monitor the discharge pressure, and the upper liquid level gauge a and the lower liquid level gauge a are used to monitor the liquid level in the oxygen-water separation tank.

[0008] Furthermore, the hydrogen-water separation tank is also provided with a hydrogen outlet, an upper liquid level gauge b, and a lower liquid level gauge b, and a pressure gauge b and a valve c are sequentially provided between the hydrogen-water separation tank and the hydrogen outlet. The valve c is used to control the circuit switch, the hydrogen outlet is used to discharge the separated hydrogen, the pressure gauge b is used to monitor the discharge pressure, and the upper liquid level gauge b and the lower liquid level gauge b are used to monitor the liquid level in the oxygen-water separation tank.

[0009] Furthermore, the water tank is provided with an upper liquid level gauge c and a lower liquid level gauge c, which are used to monitor the liquid level in the water tank.

[0010] Furthermore, the oxygen-water separation tank is further provided with a line with a valve d connecting the line between the valve a and the circulation pump b.

[0011] Furthermore, the circulation line on the water tank is provided with valve e, one-way valve a, conductivity meter, one-way valve b, valve f, circulation pump a, deionization filter, and valve g in sequence. There is a branch on the middle line of the one-way valve a and the conductivity meter and the middle line of the deionization filter and valve g, on which is provided a valve h. The valves and one-way valves are used to control the switches of each line.

[0012] Furthermore, the hydrogen-water separation tank is connected in parallel at both ends of valve f, and valve i, hydrogen-water separation tank, and valve j are arranged at both ends of valve f in sequence. Valves are used to control switches of various circuits. Furthermore, the water tank is also provided with a line connected to a drain port, and a valve k is provided on the line. The drain port is used to discharge excess water from the water tank, and the valve k is used to control the line switch.

[0013] Another object of the present invention is to protect the above-mentioned PEM membrane electrode test system capable of online purification and conductivity monitoring, the steps comprising: Water inlet process: water is injected into the water tank, and the water flows through the flow meter and the pipeline electric heater, and enters the test fixture at a certain temperature and flow rate under the temperature control of the temperature controller; Electrolysis process: Electrolysis reaction is carried out in the electrolytic cell under the action of PEM membrane electrode and catalyst to produce hydrogen and oxygen, wherein the oxygen liquid mixed water enters the oxygen water separation tank; the hydrogen liquid mixed water enters the hydrogen water separation tank; Gas-liquid separation: The hydrogen-water separation tank and the oxygen-water separation tank separate hydrogen and oxygen respectively, hydrogen is discharged from the hydrogen outlet, and oxygen is discharged from the oxygen outlet; Water electrolysis circulation mode: When the liquid level of the oxygen-water separation tank is lower than the highest level of the upper liquid level gauge a, the separated water is temporarily stored in the oxygen-water separation tank. When the liquid level of the oxygen-water separation tank is higher than the highest level of the upper liquid level gauge a, the electrolyzed water is circulated between the test fixture and the oxygen-water separation tank.

[0014] Water purification circulation mode 1: When the liquid level of the hydrogen-water separation tank is lower than the highest level of the upper liquid level gauge b, the separated water is temporarily stored in the hydrogen-water separation tank, and circulates through the deionization filter and the conductivity meter under the power of the circulation pump b to achieve online circulation purification of electrolyzed water. When the liquid level of the hydrogen-water separation tank is higher than the highest level of the upper liquid level gauge b, the electrolyzed water flows out of the hydrogen-water separation tank through the ion filter and flows back to the water storage tank.

[0015] Water purification circulation mode 2: When the liquid level of the hydrogen-water separation tank is lower than the highest level of the upper liquid level gauge b, the electrolyzed water flows out of the water storage tank, flows through the conductivity meter and under the power of the circulation pump b, flows through the deionization filter and flows back to the water storage tank, realizing the online circulation purification of the electrolyzed water.

[0016] Water purification circulation mode 3: When the liquid level of the hydrogen-water separation tank is higher than the highest level of the upper liquid level gauge b, the electrolyzed water flows out from the water storage tank and the hydrogen-water separation tank respectively, flows through the conductivity meter and under the power of the circulation pump b, flows through the deionization filter and flows back to the water storage tank, realizing the online circulation purification of the electrolyzed water.

[0017] Conductivity detection: The conductivity meter detects the conductivity of water in real time to ensure that it meets the requirements.

[0018] Flow and pressure monitoring: Monitor the flow and pressure in the system through flow meters and pressure gauges to ensure stable operation of the system.

[0019] Drainage process: When the water in the system needs to be drained, drain the water out of the system through the drain port.

[0020] The beneficial effect of the present invention compared with the prior art is that the present invention realizes online purification and real-time conductivity monitoring of circulating water through the circulating water circuit control process design, thereby ensuring that the conductivity of the circulating water meets the test requirements of the PEM membrane electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Figure 1 It is a schematic diagram of the PEM membrane electrode testing system capable of online purification and conductivity monitoring of the present invention.

[0022] In the figure, 1. test fixture; 2. water storage tank; 3. oxygen-water separation tank; 4. hydrogen-water separation tank; 5. conductivity meter; 6. circulation pump a; 7. deionization filter; 8. valve a; 9. circulation pump b; 10. flow meter; 11. pipeline electric heater; 12. temperature controller; 13. oxygen outlet; 14. upper level gauge a; 15. lower level gauge a; 16. pressure gauge a; 17. valve b; 18. hydrogen outlet; 19. upper level gauge b; 20. lower level gauge b; 21. pressure gauge b; 22. valve c; 23. upper level gauge c; 24. lower level gauge c; 25. valve d; 26. valve e; 27. one-way valve a; 28. one-way valve b; 29. ​​valve f; 30. valve g; 31. valve h; 32. valve i; 33. valve j; 34. valve k; 35. drain port. DETAILED DESCRIPTION

[0023] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels. Example 1

[0024] A PEM membrane electrode test system capable of online purification and conductivity monitoring, comprising the following components: 1. Water storage tank: used to store water required for electrolysis.

[0025] 2. Gas-liquid separation tank: used to separate hydrogen and oxygen produced by electrolysis.

[0026] 3. Conductivity meter: used to detect the conductivity of water to ensure water quality.

[0027] 4. Flow meter and pressure gauge: used to monitor the flow and pressure of water and gas in the system.

[0028] 5. Valve: used to control the flow path of water and gas in the system, including water inlet valve (ball valve), drain valve (ball valve), and gas outlet valve (needle valve).

[0029] 6. Test fixture: used to fix and connect PEM electrolyzer.

[0030] 7. Pump: Used to circulate water in the system.

[0031] 8. Pipeline heater: used to heat the fluid in the pipeline in real time.

[0032] 9. Deionization filter: used to purify electrolytic water and remove positive and negative ions produced in the water during the electrolysis process.

[0033] System structure Figure 1As shown, through the cooperation of various components, real-time purification and monitoring of water during PEM membrane electrode testing can be achieved. The working principle of the system is as follows: Water inlet process: inject water into the water storage tank 2 through the water inlet, open valve a8, and close valve d25 at the same time, so that the water flows through the flow meter 10 and the pipeline electric heater 11, and enters the test fixture 2 at a certain temperature and flow rate under the temperature control of the temperature controller 12.

[0034] Electrolysis process: Electrolysis reaction is carried out in the electrolytic cell under the action of PEM membrane electrode and catalyst to produce hydrogen and oxygen. Among them, oxygen liquid mixed water enters oxygen liquid separation tank 3; hydrogen liquid mixed water enters hydrogen liquid separation tank 4.

[0035] Gas-liquid separation: The gas-liquid separation tank separates hydrogen and oxygen, oxygen is discharged through valve b17, and hydrogen is discharged through valve c22.

[0036] Water electrolysis circulation mode: When the liquid level of the oxygen-water separation tank 3 is lower than the highest level of the upper liquid level gauge a14, keep valve a8 open, valve b17 closed, and the separated water is temporarily stored in the separation tank. When the liquid level of the oxygen-water separation tank 3 is higher than the highest level of the upper liquid level gauge a14, keep valve a8 closed, valve b17 open, and the electrolyzed water is circulated between the test fixture 1 and the oxygen-water separation tank 3.

[0037] Water purification circulation mode 1: When the liquid level of the hydrogen-water separation tank 4 is lower than the highest position of the upper liquid level gauge b19, keep valves f29, h31, i32, and j33 open, and valves e26 and g30 closed. The separated water is temporarily stored in the hydrogen-water separation tank 4, and circulates through the deionizing filter 7 and the conductivity meter 5 under the power of the purification circulation pump a6 to achieve online circulation purification of electrolyzed water. When the liquid level of the hydrogen-water separation tank 4 is higher than the highest position of the upper liquid level gauge b19, keep valves e26, f29, h31, and i32 closed, and valves g30 and j33 open, and the electrolyzed water flows out of the hydrogen-water separation tank and flows back to the water storage tank 2 through the deionizing filter 7.

[0038] Water purification circulation mode 2: When the liquid level of the hydrogen-water separation tank 4 is lower than the highest level of the upper liquid level gauge b19, keep valves e26, f29 and g30 open, and valves h31, i32 and j33 closed. The electrolyzed water flows out of the water storage tank 2, flows through the conductivity meter 5 and, under the power of the purification circulation pump a6, flows through the deionization filter 7 and flows back to the water storage tank 2, thereby realizing the online circulation purification of the electrolyzed water.

[0039] Water purification circulation mode 3: When the liquid level of the hydrogen-water separation tank 4 is higher than the highest level of the upper liquid level gauge b19, keep valves e26, f29, g30, and j33 open, and valves h31 and i32 closed. The electrolyzed water flows out from the water storage tank 2 and the hydrogen-water separation tank 4 respectively, flows through the conductivity meter 5, and under the power of the purification circulation pump a6, flows through the deionization filter 7 and flows back to the water tank, thereby realizing online circulation purification of the electrolyzed water.

[0040] Conductivity detection: The conductivity meter detects the conductivity of water in real time to ensure that it meets the requirements.

[0041] Flow and pressure monitoring: Monitor the flow and pressure in the system through flow meters and pressure gauges to ensure stable operation of the system.

[0042] Drainage process: When the water in the system needs to be drained, drain the water out of the system through the drain port.

[0043] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A PEM membrane electrode testing system capable of online purification and conductivity monitoring, characterized in that: The structure is as follows: a test fixture (1) is provided with three lines, which are respectively connected to a water storage tank (2), an oxygen-water separation tank (3), and a hydrogen-water separation tank (4); a circulation line is also provided on the water storage tank (2), and a conductivity meter (5), a circulation pump a (6), and a deionizing filter (7) are provided on the circulation line in sequence; a PEM electrolyzer is clamped in the test fixture (1); a valve a (8), a circulation pump b (9), a flow meter (10), a pipeline electric heater (11), and a temperature controller (12) are provided on the line between the water storage tank (2) and the test fixture (1); the oxygen-water separation tank (3) and the hydrogen-water separation tank (4) are respectively connected to the water storage tank (2), an oxygen-water separation tank (3), and a hydrogen-water separation tank (4); a circulation line is provided on the water storage tank (2), and a conductivity meter (5), a circulation pump a (6), and a deionizing filter (7) are provided on the circulation line in sequence; a PEM electrolyzer is clamped in the test fixture (1); a valve a (8), a circulation pump b (9), a flow meter (10), a pipeline electric heater (11), and a temperature controller (12) are provided on the line between the water storage tank (2) and the test fixture (1) in sequence; The tank (3) is also provided with an oxygen outlet (13), an upper liquid level gauge a (14), and a lower liquid level gauge a (15); a pressure gauge a (16) and a valve b (17) are provided in sequence between the oxygen-water separation tank (3) and the oxygen outlet (13); the hydrogen-water separation tank (4) is also provided with a hydrogen outlet (18), an upper liquid level gauge b (19), and a lower liquid level gauge b (20); a pressure gauge b (21) and a valve c (22) are provided in sequence between the hydrogen-water separation tank (4) and the hydrogen outlet (18); the water storage tank (2) is provided with an upper liquid level gauge c (23) and a lower liquid level gauge c (24); The test method of the above-mentioned PEM membrane electrode test system comprises the following steps: Water inlet process: water is injected into the water storage tank (2), and the water flows through the flow meter (10) and the pipeline electric heater (11), and enters the test fixture (1) at a certain temperature and flow rate under the temperature control of the temperature controller (12); Electrolysis process: Electrolysis reaction is carried out in the electrolytic cell under the action of the PEM membrane electrode and the catalyst to generate hydrogen and oxygen, wherein the oxygen-liquid mixed water enters the oxygen-water separation tank (3); the hydrogen-liquid mixed water enters the hydrogen-water separation tank (4); Gas-liquid separation: the hydrogen-water separation tank (4) and the oxygen-water separation tank (3) separate hydrogen and oxygen respectively, the hydrogen is discharged from the hydrogen discharge port (18), and the oxygen is discharged from the oxygen discharge port (13); Water electrolysis circulation mode: when the liquid level of the oxygen-water separation tank (3) is lower than the highest level of the upper liquid level gauge a (14), the separated water is temporarily stored in the oxygen-water separation tank (3); when the liquid level of the oxygen-water separation tank (3) is higher than the highest level of the upper liquid level gauge a (14), the electrolyzed water is circulated between the test fixture (1) and the oxygen-water separation tank (3); Water purification circulation mode 1: when the liquid level of the hydrogen-water separation tank (4) is lower than the highest level of the upper liquid level gauge b (19), the separated water is temporarily stored in the hydrogen-water separation tank (4), and circulates through the deionizing filter (7) and the conductivity meter (5) under the power of the circulation pump b (9), so as to realize the online circulation purification of the electrolyzed water. When the liquid level of the hydrogen-water separation tank (4) is higher than the highest level of the upper liquid level gauge b (19), the electrolyzed water flows out of the hydrogen-water separation tank (4) through the deionizing filter (7) and flows back to the water storage tank (2); Water purification circulation mode 2: When the liquid level of the hydrogen-water separation tank (4) is lower than the highest level of the upper liquid level gauge b (19), the electrolyzed water flows out of the water storage tank (2), flows through the conductivity meter (5), and under the power of the circulation pump b (9), flows through the deionization filter (7) and flows back to the water storage tank (2), thereby realizing online circulation purification of the electrolyzed water; Water purification circulation mode 3: When the liquid level of the hydrogen-water separation tank (4) is higher than the highest level of the upper liquid level gauge b (19), the electrolyzed water flows out from the water storage tank (2) and the hydrogen-water separation tank (4) respectively, flows through the conductivity meter (5) and, under the power of the circulation pump b (9), flows through the deionization filter (7) and flows back to the water storage tank (2), thereby realizing online circulation purification of the electrolyzed water; Conductivity test: Conductivity meter (5) tests the conductivity of water in real time to ensure that it meets the requirements; Flow and pressure monitoring: Monitor the flow and pressure in the system through flow meters and pressure gauges to ensure stable operation of the system; Drainage process: When the water in the system needs to be drained, drain the water out of the system through the drain port (35).

2. The PEM membrane electrode testing system capable of online purification and conductivity monitoring according to claim 1, characterized in that: The oxygen-water separation tank (3) is further provided with a line with a valve d (25) connecting the line between the valve a (8) and the circulation pump b (9).

3. The PEM membrane electrode testing system capable of online purification and conductivity monitoring according to claim 1, characterized in that: A valve e (26), a one-way valve a (27), a conductivity meter (5), a one-way valve b (28), a valve f (29), a circulation pump a (6), a deionizing filter (7), and a valve g (30) are sequentially arranged on the circulation line on the water storage tank (2). A branch line is arranged on the middle line between the one-way valve a (27) and the conductivity meter (5) and the middle line between the deionizing filter (7) and the valve g (30), and a valve h (31) is arranged on the branch line.

4. The PEM membrane electrode testing system capable of online purification and conductivity monitoring according to claim 1, characterized in that: The hydrogen-water separation tank (4) is connected in parallel to both ends of the valve f (29), and valve i (32), the hydrogen-water separation tank (4), and valve j (33) are sequentially arranged at both ends of the valve f (29).

5. The PEM membrane electrode testing system capable of online purification and conductivity monitoring according to claim 1, characterized in that: The water storage tank (2) is also provided with a line connected to the liquid discharge port (35), and a valve k (34) is provided on the line.

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