PEM water electrolysis hydrogen production test system

Abstract

The utility model discloses a PEM water electrolysis hydrogen production test system which comprises n groups of membrane electrodes, a hydrogen passage, an oxygen passage, a make-up water passage and a hydrogen-in-oxygen test passage, n is an integer greater than 1; wherein each group of membrane electrodes can comprise m membrane electrodes, and m is an integer greater than or equal to 1; the membrane electrode is controllably communicated with the hydrogen passage, the oxygen passage, the water supply passage and the hydrogen-in-oxygen test passage through electromagnetic valves respectively; the n groups of membrane electrodes are separately communicated to the oxygen-in-hydrogen test channel in turn; and the hydrogen-in-oxygen test channel comprises an oxygen side gas-liquid separator, a back pressure valve, a gas flowmeter and a hydrogen-in-oxygen analyzer which are connected in sequence. The hydrogen-in-oxygen test paths of the multiple groups of membrane electrodes in the system are independently controlled, so that the detection in an isobaric mode and a differential pressure mode can be realized.

Description

Technical Field

[0001] The invention relates to the field of hydrogen production by water electrolysis, and in particular to the field of PEM water electrolysis hydrogen production testing. Background Art

[0002] With the rapid development of renewable energy such as wind power and photovoltaics, water electrolysis to produce hydrogen has received increasing attention as one of the long-term, large-scale energy storage methods.

[0003] Considering the advantages of high working current density, small size and high efficiency, PEM (proton exchange membrane) water electrolysis to produce hydrogen has broad development prospects.

[0004] The core component of water electrolysis equipment is the electrolyzer, and the place where the water electrolysis reaction occurs is the membrane electrode. The performance of the membrane electrode has a crucial impact on the performance of the electrolyzer. After the development and production of the membrane electrode, relevant performance tests need to be carried out. The current common performance test method is to connect the membrane electrode to the power supply, pass pure water from the anode, and electrolyze the water into hydrogen and oxygen under the action of the current, and measure and record the relevant data to obtain the performance of the membrane electrode.

[0005] Due to the rapid development of technology, many scenarios require simultaneous testing of multiple groups of membrane electrodes. When multiple groups of membrane electrodes need to be tested simultaneously, the existing testing methods cannot achieve simultaneous testing of multiple groups of membrane electrodes, because the existing testing methods have disadvantages such as long cycle, high labor intensity, and low reliability. More importantly, only one group of membrane electrodes can be tested at a time, and more than two groups of membrane electrodes cannot be tested at the same time, which reduces the development and testing efficiency of membrane electrodes. Therefore, it is necessary to develop a system for simultaneous testing of multiple groups of membrane electrodes. During the test process, sometimes the performance of the membrane electrode will be tested in different modes, such as isobaric mode and differential pressure mode, as needed; sometimes the test work will continue for several days or months as needed to determine the durability of the membrane electrode. Therefore, the industry needs a multi-mode, safe, and automatic testing system. Summary of the invention

[0006] The purpose of the present invention is to provide a PEM water electrolysis hydrogen production test system. The system of the present invention can realize the test of multiple groups of membrane electrodes, with high test efficiency. The test of each membrane electrode is independently controllable, which can meet the industry's demand for the test system.

[0007] The PEM water electrolysis hydrogen production test system of the present invention comprises n groups of membrane electrodes, a hydrogen passage, an oxygen passage, a supply water passage, and a hydrogen in oxygen test passage; n is an integer greater than 1; each group of membrane electrodes may include m membrane electrodes, and m is an integer greater than or equal to 1;

[0008] The membrane electrodes are controllably connected to the hydrogen passage, the oxygen passage, the feed water passage, and the oxygen-hydrogen test passage respectively through electromagnetic valves; n groups of membrane electrodes are individually connected to the oxygen-hydrogen test passage in turn;

[0009] The hydrogen-in-oxygen test passage comprises an oxygen-side gas-liquid separator, a pressure valve, a gas flow meter and a hydrogen-in-oxygen analyzer which are connected in sequence.

[0010] In one embodiment, the oxygen passage includes a pure water tank, a water replenishment pump and a water storage tank which are connected in sequence; wherein the oxygen outlet of the membrane electrode is connected to the oxygen inlet of the pure water tank, and the oxygen in the pure water tank is discharged through the oxygen outlet of the pure water tank; wherein the water replenishment pump can pump water in the water storage tank to the pure water tank; and a heater is provided in the pure water tank for heating water to the water replenishment temperature.

[0011] In one embodiment, the water outlet of the oxygen-side gas-liquid separator is connected to a pure water tank via a two-way valve.

[0012] In one embodiment, the oxygen outlets of the n groups of membrane electrodes are simultaneously connected to an oxygen main pipeline, and the oxygen main pipeline is connected to an oxygen-side gas-liquid separator.

[0013] In one embodiment, the hydrogen outlets of the n groups of membrane electrodes are connected to the hydrogen-side gas-liquid separator.

[0014] In one embodiment, the water inlets of the n groups of membrane electrodes are connected to the pure water tank at the same time.

[0015] In one embodiment, the water outlet at the bottom of the pure water tank is connected to the water inlet of the membrane electrode via a water flow meter and a deionizer in sequence, so that the water in the pure water tank can be pumped to supply the membrane electrode.

[0016] In one embodiment, the hydrogen passage includes hydrogen-side gas-liquid separators connected in sequence, and the gas-liquid inlet of the hydrogen-side gas-liquid separator is connected to the hydrogen outlet of the membrane electrode; optionally, it also includes a back-pressure valve, which is connected to the hydrogen outlet of the hydrogen-side gas-liquid separator and is used to regulate the pressure of the hydrogen outlet.

[0017] In one embodiment, the water outlet of the hydrogen-side gas-liquid separator is connected to a pure water tank via a two-way valve.

[0018] The system of the present invention has the following beneficial effects:

[0019] 1. The system of the present invention can realize the testing functions of both equal pressure and differential pressure modes;

[0020] 2. The system of the present invention can test multiple groups of membrane electrodes at the same time and realize individual control;

[0021] 3. When testing multiple groups of membrane electrodes, the system of the present invention can switch in turn to measure the hydrogen content in the oxygen produced by each group of membrane electrodes to ensure the safety of long-term and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a specific embodiment of the system of the present invention. DETAILED DESCRIPTION

[0023] The system of the present invention is further described below in conjunction with embodiments and drawings.

[0024] A specific embodiment of the system of the present invention is as follows Figure 1 The system includes 3 sets of membrane electrodes, a hydrogen passage, an oxygen passage, a water supply passage, and a hydrogen in oxygen test passage;

[0025] The hydrogen passage includes a hydrogen side gas-liquid separator and a back pressure valve BV-03; the hydrogen outlet of the membrane electrode is connected to the gas inlet of the hydrogen side gas-liquid separator. The hydrogen side gas-liquid separator is connected to the pure water tank through a two-way valve SV-04. A pressure sensor PI-03 is provided on the top of the hydrogen side gas-liquid separator to monitor the gas pressure in the hydrogen side gas-liquid separator; a high liquid level valve LV-04 and a low liquid level valve LV-03 are provided on the side wall of the hydrogen side gas-liquid separator. When the middle liquid level of the hydrogen side gas-liquid separator is higher than the high liquid level valve LV-04, the liquid in the hydrogen side gas-liquid separator is discharged to the pure water tank through the two-way valve SV-04. The hydrogen in the hydrogen side gas-liquid separator is discharged through the hydrogen outlet, and the gas pressure on the discharge pipeline is monitored by the back pressure valve BV-03.

[0026] The oxygen passage includes an oxygen-side gas-liquid separator, a back pressure valve BV-02, a gas flow meter MFM-02 and an oxygen-hydrogen analyzer which are connected in sequence. The back pressure valve BV-02 is used to monitor the gas pressure in the exhaust pipeline; the gas flow meter MFM-02 is used to monitor the gas flow in the exhaust pipeline; and the oxygen-hydrogen analyzer is used to detect the content of hydrogen in oxygen.

[0027] Among them, the oxygen outlets of the three groups of membrane electrodes are switchably connected to the oxygen main pipeline 1 and the oxygen main pipeline 2 through three-way solenoid valves (TV-11, TV-21, TV-N1), the oxygen main pipeline 2 is connected to the gas inlet of the oxygen side gas-liquid separator, and the gas outlet of the oxygen side gas-liquid separator is connected to the back pressure valve BV-02. A pressure sensor PI-02 is provided on the top of the oxygen side gas-liquid separator to monitor the gas pressure in the oxygen side gas-liquid separator. The liquid outlet of the oxygen side gas-liquid separator is connected to the pure water tank via a two-way valve SV-03, so that the liquid in the oxygen side gas-liquid separator can be discharged into the pure water tank. The oxygen outlet of the membrane electrode is provided with a temperature sensor (TI-11, TI-21, TI-N1) to monitor the oxygen temperature, which can be regarded as the working temperature of the membrane electrode.

[0028] The oxygen main pipeline 1 is connected to the oxygen inlet of the pure water tank, and the oxygen outlet of the pure water tank is connected to the back pressure valve BV-01. The back pressure valve BV-01 is used to monitor the oxygen discharge pressure in the pure water tank.

[0029] A pressure sensor PI-01 is installed on the top of the pure water tank to monitor the air pressure in the pure water tank; a heating rod TT is installed on the bottom of the pure water tank to heat the water so that the water discharged from the pure water tank and supplied to the membrane electrode is kept at the supply water temperature, which is usually 70-80°C. A high level valve LV-02 and a low level valve LV-01 are installed on the side wall of the pure water tank. The supply water inlet of the pure water tank is connected to the water storage tank via the pump PUMP-01, and the water in the water storage tank is pumped to the pure water tank by the pump PUMP-01. A temperature sensor TI-01 and a conductivity sensor CI-01 are also installed inside the pure water tank to monitor the heating and conductivity of the water in the pure water tank. When the liquid level in the pure water tank is higher than the high liquid level valve LV-02, stop the pumping of PUMP-01 and open the drain valve SV-02; when the liquid level in the pure water tank is lower than the low liquid level valve LV-01, close the drain valve SV-02 and start the pumping of PUMP-01; during operation, keep the liquid level in the pure water tank between the high liquid level valve LV-02 and the low liquid level valve LV-01.

[0030] The water outlet of the pure water tank is connected to the drainage pipeline and the makeup water pipeline respectively; the makeup water pipeline includes the pump PUMP-02, flow meter MFM-01, deionizer and water main pipeline connected in sequence; the water inlet of the three groups of membrane electrodes is connected to the water main pipeline via flow meters (MFM-11, MFM-21, MFM-N1) and two-way solenoid valves (SV-11, SV-21, SV-N1,) respectively; the inlet and outlet of the pump PUMP-02 are connected with the two-way valve SV-01, which is used to adjust the supply stability of the makeup water. The flow meter MFM-01 is used to monitor the supply flow of the makeup water. When the minimum flow of the pump is still greater than the maximum flow required by the three groups of membrane electrodes, the two-way valve SV-01 is opened for adjustment. In the makeup water pipeline, a temperature sensor TI-02 is arranged between the deionizer and the water main pipeline to monitor the temperature of the makeup water. A two-way valve SV-02 is arranged on the drainage pipeline to control the liquid level of the pure water tank.

[0031] The multi-mode test that can be realized by the system of the present invention is generally described as follows: when it is necessary to measure in isobaric mode, adjust the opening of the back pressure valve (BV-01, BV-02, BV-03) so that the hydrogen side gas-liquid separator pressure (monitored by pressure sensor PI-03), the oxygen side gas-liquid separator pressure (monitored by pressure sensor PI-02), and the pure water tank pressure (monitored by pressure sensor PI-01) are consistent; when it is necessary to measure in differential pressure mode, adjust the opening of the back pressure valve (BV-01, BV-02) so that the oxygen side gas-liquid separator pressure (monitored by pressure sensor PI-02) and the pure water tank pressure (monitored by pressure sensor PI-01) are consistent and close to normal pressure; adjust the back pressure valve BV-03 so that the hydrogen side gas-liquid separator pressure (monitored by pressure sensor PI-03) is maintained at the target pressure value (for example, 1.6MPa, 3.0MPa, etc.).

[0032] The oxygen-hydrogen test that can be realized by the system of the present invention is generally described as follows: when testing multiple groups of membrane electrodes, adjust the three-way solenoid valve TV-11 so that the oxygen generated by the first group of membrane electrodes does not enter the oxygen main pipeline 1 with a large diameter, but enters the oxygen main pipeline 2 with a small diameter, and then enters the oxygen-hydrogen analyzer through the back pressure valve BV-02 and the gas flowmeter MFM-02 after gas-liquid separation, thereby measuring the hydrogen content of oxygen in the first group of membrane electrodes. If the measured value is higher than the upper limit value (which can be set, such as 2% V / V), the power of the first group of membrane electrodes is cut off (not shown in the figure), the solenoid valve SV-11 is closed, and the test of the first group of membrane electrodes is stopped to ensure the safety of the system. If the measured value is lower than the upper limit (which can be set, such as 2% V / V), the three-way solenoid valve TV-11 switches, so that the oxygen produced by the first group of membrane electrodes enters the oxygen main pipeline 1 with a larger diameter, but does not enter the oxygen main pipeline 2 with a smaller diameter (the diameter of oxygen main pipeline 1 is larger than that of oxygen main pipeline 2). At this time, the three-way solenoid valve TV-21 switches, so that the second group of membrane electrodes performs the same oxygen-hydrogen test. And so on.

[0033] In the hydrogen production system of the present application, the oxygen generated by multiple groups of membrane electrodes can be independently and controllably switched to the oxygen-hydrogen test path, thereby realizing simultaneous detection of multiple groups of membrane electrodes; in addition, since the oxygen-hydrogen test paths of the multiple groups of membrane electrodes are independently controlled, simultaneous detection of different isobaric modes and different differential pressure modes can be realized.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and variations. The above embodiments or implementations are merely illustrative of the present invention, and the present invention may also be implemented in other specific ways or other specific forms without departing from the gist or essential features of the present invention. Therefore, the described implementations should be considered illustrative rather than restrictive in any respect. The scope of the present invention should be described by the appended claims, and any changes equivalent to the intent and scope of the claims should also be included within the scope of the present invention.

Claims

1. A PEM water electrolysis hydrogen production test system, characterized in that: It includes n groups of membrane electrodes, a hydrogen passage, an oxygen passage, a feed water pipeline, and a hydrogen-in-oxygen test passage; n is an integer greater than 1; each group of membrane electrodes may include m membrane electrodes, and m is an integer greater than or equal to 1; Among them, each membrane electrode is connected to the hydrogen passage, the oxygen passage, the feed water passage, and the oxygen-hydrogen test passage respectively; n groups of membrane electrodes are connected to the oxygen-hydrogen test passage individually in turn; The hydrogen-in-oxygen test passage comprises an oxygen-side gas-liquid separator, a pressure valve, a gas flow meter and a hydrogen-in-oxygen analyzer which are connected in sequence.

2. The system according to claim 1, characterized in that The oxygen passage comprises a pure water tank, a water replenishment pump and a water storage tank which are connected in sequence; wherein the oxygen outlet of the membrane electrode is connected to the oxygen inlet of the pure water tank, and the oxygen in the pure water tank is discharged through the oxygen outlet of the pure water tank; wherein the water replenishment pump can pump the water in the water storage tank to the pure water tank; and a heater is provided in the pure water tank for heating the water to the water replenishment temperature.

3. The system according to claim 2, characterized in that The water outlet of the oxygen-side gas-liquid separator is connected to the pure water tank via a two-way valve.

4. The system according to claim 2, characterized in that The oxygen outlets of the n groups of membrane electrodes are simultaneously connected to an oxygen main pipeline, and the oxygen main pipeline is connected to an oxygen-side gas-liquid separator.

5. The system according to claim 1, characterized in that The hydrogen outlets of the n groups of membrane electrodes are connected to the hydrogen-side gas-liquid separator.

6. The system according to claim 1, characterized in that The water inlets of the n groups of membrane electrodes are connected to the pure water tank at the same time.

7. The system according to claim 6, characterized in that The water outlet at the bottom of the pure water tank is connected to the water inlet of the membrane electrode via a water flow meter and a deionizer in sequence, so that the water in the pure water tank can be pumped and supplied to the membrane electrode.

8. The system according to claim 1, characterized in that The hydrogen passage includes hydrogen-side gas-liquid separators connected in sequence, wherein the gas-liquid inlet of the hydrogen-side gas-liquid separator is connected to the hydrogen outlet of the membrane electrode; and optionally also includes a back-pressure valve, which is connected to the hydrogen outlet of the hydrogen-side gas-liquid separator and is used to regulate the pressure of the hydrogen outlet.

9. The system according to claim 8, characterized in that The water outlet of the hydrogen-side gas-liquid separator is connected to the pure water tank via a two-way valve.

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