Medium-voltage small-power PEM hydrogen production electrolyzed water testing device
By designing a test device for hydrogen electrolyzing of medium-voltage low-power PEM, using a pressure-resistant deionizer, a pressure-resistant water supply system and a fast backpressure system, the problem that existing equipment cannot meet the medium-voltage testing needs is solved, and the medium-voltage testing and durability testing of low-power PEM electrolyzers are realized.
Patent Information
- Application Number
- CN202510196292.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-05-23
AI Technical Summary
The existing low-power PEM hydrogen production test equipment cannot meet the needs of medium-voltage testing, and it is difficult to achieve pressure withstand voltage testing, durability testing in medium-voltage states and quickly establish back pressure states.
A test device for hydrogen electrolyzing water production in medium-voltage low-power PEM is designed, and a self-developed pressure-resistant deionizer, pressure-resistant water supply system and nitrogen-assisted charging fast backpressure system is adopted to ensure the accurate control of the water supply flow of the electrolytic cell under medium-voltage state and the rapid establishment of the backpressure state.
The medium-voltage testing requirement for a small-power PEM electrolytic cell is realized, and the test pressure can be adjusted quickly and accurately, the hydrogen production amount in the pressure-bar state is accurately tested, and the conductivity of deionized water is ensured in the medium-voltage state, which meets long-term durability testing.
Smart Images
Figure CN120028488A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of PEM hydrogen production, and in particular relates to a testing device for medium-pressure and low-power PEM hydrogen production and water electrolysis. Background Art
[0002] Hydrogen energy has the characteristics of abundant resources, renewable, storable, clean and environmentally friendly. The exploration and research in the field of hydrogen energy are becoming more and more important. Among the hydrogen production in the field of hydrogen energy, the most popular and widespread technology is the electrolysis of water. Proton exchange membrane (PEM) hydrogen production and electrolysis of water technology is a clean and environmentally friendly hydrogen production technology. Domestic and foreign research on PEM hydrogen production is becoming more and more important. More and more hydrogen refueling stations are preparing to use PEM hydrogen production technology. Therefore, the development and testing of PEM hydrogen production is particularly important.
[0003] At present, most of the testing equipment for small-power PEM hydrogen production at home and abroad is still at the low-pressure test stage. With the development of the PEM hydrogen production industry, more and more manufacturers are increasing their demand for electrolyzers. Currently, manufacturers of PEM hydrogen production electrolyzers are in urgent need of small-power PEM hydrogen production testing equipment for the research and development of electrolyzers. However, the pressure resistance test of medium-pressure small-power PEM hydrogen production testing equipment, the endurance test under medium-pressure state and the rapid establishment of back-pressure state are the difficulties of most PEM hydrogen production testing equipment. Summary of the invention
[0004] In order to overcome the shortcomings of the prior art, the present invention provides a testing device for medium-pressure and low-power PEM hydrogen production and electrolysis of water, which adopts a independently developed pressure-resistant deionizer to ensure that the conductivity of deionized water in a medium-pressure state meets the durability test of a medium-pressure and low-power electrolyzer, and forms a pressure-resistant water supply system by selecting pressure-resistant devices to ensure precise control of the water supply flow rate of the electrolyzer under pressure, and adopts a fast back pressure system with nitrogen-assisted pressurization to achieve fast back compression and short back pressure waiting time, so as to meet the test of medium-pressure and low-power PEM hydrogen production.
[0005] The above object of the present invention is achieved through the following technical scheme: a medium-pressure low-power PEM hydrogen production and water electrolysis test device, comprising:
[0006] The hydrogen water separator, the deionized water supply tank, and the medium-pressure PEM electrolyzer of the object to be measured are connected in a loop. The deionized water supply tank is connected to the oxygen water separator. A branch is also provided between the deionized water supply tank and the medium-pressure PEM electrolyzer of the object to be measured. The branch is provided with a pressure-resistant water supply pump, a pressure-resistant rapid heater, a non-contact water flow meter, and an electrolyzer water supply valve in sequence. The hydrogen water separator is provided with a H 2 Enter the pipeline, H 2 The inlet pipeline is equipped with an online analyzer of oxygen in hydrogen and an O 2 Enter the pipeline, O 2 The inlet pipeline is equipped with an online analyzer of hydrogen in oxygen;2 The inlet pipelines are respectively connected to the pipeline between the hydrogen water separation tank and the medium-pressure PEM electrolyzer of the object to be measured, and the pipeline between the deionized water supply tank and the medium-pressure PEM electrolyzer of the object to be measured.
[0007] Furthermore, a hydrogen back pressure valve, a hydrogen discharge solenoid valve and a hydrogen mass flow meter are provided in sequence between the hydrogen water separation tank and the hydrogen-oxygen online analyzer.
[0008] Furthermore, an oxygen back pressure valve, an oxygen discharge solenoid valve, and an oxygen mass flow meter are sequentially provided between the oxygen water separation tank and the oxygen-hydrogen online analyzer.
[0009] Furthermore, the N 2 The pipeline between the hydrogen water separator and the medium-pressure PEM electrolyzer of the object to be measured is equipped with a hydrogen and nitrogen auxiliary charging flow controller, a hydrogen and nitrogen auxiliary charging solenoid valve, and a N 2 An oxygen-nitrogen auxiliary pressure-charging flow controller and an oxygen-nitrogen auxiliary pressure-charging solenoid valve are arranged in sequence on the pipeline between the deionized water supply tank and the medium-pressure PEM electrolyzer of the object to be measured.
[0010] Furthermore, the pipeline from the hydrogen water separation tank to the deionized water supply tank is provided with three branches, namely a hydrogen drain outlet, a water replenishment outlet, and an oxygen drain outlet.
[0011] According to a further preferred embodiment of the present invention, a hydrogen main drainage solenoid valve, a hydrogen water separation tank medium-pressure drainage valve, and a hydrogen water separation tank medium-pressure drainage flow controller are sequentially provided between the hydrogen drainage outlet and the pipeline from the hydrogen water separation tank to the deionized water supply tank, and a branch is also provided between the hydrogen main drainage solenoid valve and the hydrogen water separation tank medium-pressure drainage valve to connect the pipeline from the hydrogen water separation tank to the deionized water supply tank, on which a hydrogen low-pressure drainage valve is provided.
[0012] Further preferred embodiment of the present invention is that two parallel branches are provided between the water replenishment port and the pipeline from the hydrogen water separation tank to the deionized water supply tank, one of which is provided with a low-pressure water replenishment pump, the pipeline leading to the hydrogen water separation tank is provided with a hydrogen low-pressure water replenishment valve, and the pipeline leading to the deionized water supply tank is provided with an oxygen low-pressure water replenishment valve; the other branch is provided with a plunger pump, the pipeline leading to the hydrogen water separation tank is provided with a hydrogen medium-pressure water replenishment valve, and the pipeline leading to the deionized water supply tank is provided with an oxygen medium-pressure water replenishment valve.
[0013] In a further preferred embodiment of the present invention, two parallel branches are provided between the oxygen drain outlet and the pipeline from the hydrogen water separation tank to the deionized water supply tank, and an oxygen medium-pressure drain valve and an oxygen low-pressure drain valve are provided on the two branches respectively.
[0014] In a further preferred embodiment of the present invention, the deionized water supply tank is further provided with a branch line connecting a pipeline between the pressure-resistant water supply pump and the pressure-resistant rapid heater, and a pressure-resistant deionizer is provided on the branch line.
[0015] The medium-pressure low-power PEM hydrogen production and electrolysis water test device is also provided with a monitoring system, which is electrically connected to the medium-pressure low-power PEM hydrogen production and electrolysis water test device PLC; the medium-pressure low-power PEM hydrogen production and electrolysis water test device and sensor values are controlled and monitored in real time.
[0016] The beneficial effects of the present invention compared with the prior art are:
[0017] The medium-pressure, low-power PEM hydrogen electrolysis water test device measures the current water flow rate online in real time through a contactless water flow meter, uses typical PID control to control the speed of the pressure-resistant water pump to accurately control the water supply flow rate, and designs a bypass at the water pump outlet to install a self-developed pressure-resistant deionizer to adjust the water quality in real time to ensure long-term durability testing; a fast heater is used at the water pump outlet to control the water supply temperature to meet the testing requirements of the high-temperature electrolyzer.
[0018] The medium-pressure and low-power PEM hydrogen production and electrolysis water test device is equipped with a pressure-resistant plate heat exchanger to desorb the saturated water in the gas and flow it through the water separation tank for gas-water separation. The gas-water separation tank drainage uses a flow meter to accurately control the drainage volume, and then accurately controls the liquid level in the water separation tank to ensure the stability of the pressure and the stability of the tail end flow.
[0019] The medium-pressure low-power PEM hydrogen electrolysis water test device is equipped with a pressure-resistant nitrogen flow controller to achieve nitrogen-assisted pressurization, and the rapid back pressure and hydrogen-oxygen pressure difference control are achieved by controlling the nitrogen pressurization flow. This back pressure system is equipped with an adaptive back pressure controller, which directly controls the pressure at the upper end of the back pressure valve to quickly reach the target pressure, thereby ensuring that there is no obvious overshoot of pressure and the pressure is stable in the steady state.
[0020] The medium-pressure, low-power PEM hydrogen production and electrolysis water test device adopts two-stage drying to remove water molecules in the gas to the maximum extent to ensure the accuracy of the hydrogen flow test, and accurately measures the gas production flow through the purchased internationally renowned brand mass flow meter.
[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: currently, most of the low-power PEM hydrogen production test equipment at home and abroad are low-pressure low-power PEM hydrogen production equipment, which cannot meet the medium-pressure test of the low-power PEM electrolyzer, and the present invention is mainly developed for the medium-pressure electrolyzer test of the low-power PEM water electrolysis hydrogen production. Compared with other existing equipment, the present invention can meet the medium-pressure test requirements of the low-power PEM hydrogen production electrolyzer, can quickly and accurately adjust the test pressure from low pressure to medium pressure, and can accurately test the hydrogen production under pressure. It is difficult to accurately test the hydrogen flow rate of other PEM hydrogen production equipment; the present invention adopts the independently developed pressure-resistant deionizer, which can ensure the conductivity of deionized water under medium pressure to meet the long-term durability test of the electrolyzer. The high-pressure use environment of most domestic and foreign equipment does not have the deionized water purification function. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0023] Figure 1 It is a structural schematic diagram of the test device for medium-pressure and low-power PEM hydrogen production and water electrolysis.
[0024] In the figure, 1. Hydrogen water separator; 2. Hydrogen back pressure valve; 3. Hydrogen discharge solenoid valve; 4. Hydrogen mass flow meter; 5. Hydrogen oxygen online analyzer; 6. Hydrogen water separator medium pressure drainage flow controller; 7. Hydrogen water separator medium pressure drainage valve; 8. Hydrogen total drainage solenoid valve; 9. Hydrogen low pressure drainage valve; 10. Oxygen plate heat exchanger; 11. Oxygen back pressure valve; 12. Oxygen discharge solenoid valve; 13. Oxygen mass flow meter; 14. Oxygen hydrogen online analyzer; 15. Oxygen water separator; 16. Oxygen medium pressure drainage valve; 17. Hydrogen low pressure water supply valve; 18. Hydrogen medium pressure water supply valve; 19. Oxygen 1. Low-pressure water supply valve for oxygen; 20. Low-pressure water supply pump; 21. Medium-pressure water supply valve for oxygen; 22. Plunger pump; 23. Low-pressure drain valve for oxygen; 24. Deionized water supply tank; 25. Hydrogen plate heat exchanger; 26. Hydrogen and nitrogen auxiliary pressure charging flow controller; 27. Hydrogen and nitrogen auxiliary pressure charging solenoid valve; 28. Oxygen and nitrogen auxiliary pressure charging flow controller; 29. Oxygen and nitrogen auxiliary pressure charging solenoid valve; 30. Medium-pressure PEM electrolyzer of the object to be measured; 31. Pressure-resistant deionizer; 32. Pressure-resistant water supply pump; 33. Pressure-resistant fast heater; 34. Contactless water flow meter; 35. Electrolyzer water supply valve. DETAILED DESCRIPTION
[0025] 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.
[0026] Example 1
[0027] like Figure 1 The test method of the medium-pressure low-power PEM hydrogen electrolysis water test device is as follows:
[0028] Before starting, the low-pressure water supply pump 20 is used to replenish water, and the hydrogen low-pressure water supply valve 17 and the oxygen low-pressure water supply valve 19 are opened to replenish deionized water to the deionized water supply tank 24, the hydrogen water tank 1, and the oxygen water tank 15. After the liquid level of the water tank is controlled to be above 88%, the low-pressure water supply pump 20, the hydrogen low-pressure water supply valve 17, and the oxygen low-pressure water supply valve 19 are closed to switch to the precise water supply mode, and the plunger pump 22, the hydrogen medium-pressure water supply valve 18, and the oxygen medium-pressure water supply valve 21 are opened to accurately control the water supply amount, and the liquid level of the water tank is replenished to 95%, and the plunger pump 22, the hydrogen medium-pressure water supply valve 18, and the oxygen medium-pressure water supply valve 21 are closed. The electrolyzer water supply valve 35 is opened to set the flow rate to 300 ml / min. At this time, the speed of the pressure-resistant water supply pump 32 is controlled by the PID algorithm according to the flow feedback from the contactless water flow meter 34, so that the water supply flow rate is stabilized at 300 ml / min. Part of the deionized water flows into the medium-pressure PEM electrolyzer 30 of the object to be measured, and part of the deionized water flows through the pressure-resistant deionizer 31 through a bypass and returns to the deionized water supply tank 24 to purify the deionized water in the tank in real time.
[0029] The hydrogen produced by the electrolyzer is cooled and dehydrated through the hydrogen plate heat exchanger 25, and the gas-water mixture flows to the hydrogen water separation tank 1 through the connecting pipeline for gas-water separation. The separated hydrogen is back-pressurized through the hydrogen back-pressure valve 2, and the pressure is set to 3MPa. At this time, the pressure at the upper end of the back-pressure valve quickly reaches 3MPa, and the pressure at the lower end of the back-pressure valve is quickly back-pressurized by supplementing nitrogen. The hydrogen and nitrogen auxiliary charging solenoid valve 27 is opened, and the flow rate of the hydrogen and nitrogen auxiliary charging flow controller 26 is set to 3SLPM. The pressure at the lower end of the back-pressure valve quickly rises to 3MPa in conjunction with the actual hydrogen production, and there is no obvious overshoot when the pressure is balanced with the pressure at the upper end of the back-pressure valve.
[0030] The oxygen produced by the electrolyzer is cooled and dehydrated through the oxygen plate heat exchanger 10, and the gas-water mixture flows to the oxygen water separation tank 15 through the connecting pipeline for gas-water separation. The separated oxygen passes through the oxygen back pressure valve 11 for back pressure, and the pressure is set to 3MPa at the same time as the hydrogen. At this time, the pressure at the upper end of the back pressure valve quickly reaches 3MPa, and the pressure at the lower end of the back pressure valve is quickly back pressured by supplementing nitrogen. The oxygen and nitrogen auxiliary charging solenoid valve 29 is opened, and the flow rate of the oxygen and nitrogen auxiliary charging flow controller 28 is set to 5SLPM. The pressure at the lower end of the back pressure valve is quickly raised to 3MPa in accordance with the actual hydrogen production, and there is no obvious overshoot when the pressure is balanced with the pressure at the upper end of the back pressure valve. Since the oxygen production is small, the nitrogen filling amount of the oxygen circuit must be greater than the nitrogen filling amount of the hydrogen circuit, so as to achieve synchronous pressure increase of hydrogen and oxygen, which can effectively control the pressure difference between hydrogen and oxygen during the pressure increase process.
[0031] Since oxygen will permeate water molecules into hydrogen, this system sets a hydrogen water separation tank medium-pressure drainage flow controller 6 at the drainage position of the hydrogen water separation tank 1 to accurately control the liquid level of the hydrogen water separation tank so that the back pressure will not fluctuate greatly due to drainage, thereby achieving stability and accuracy of hydrogen flow measurement.
[0032] 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 medium-pressure, low-power PEM hydrogen electrolysis water test device, characterized in that: include: A hydrogen water separation tank (1), a deionized water supply tank (24), and a medium-pressure PEM electrolyzer (30) of the object to be measured are connected in a loop; an oxygen water separation tank (15) is connected to the deionized water supply tank (24); a branch line is provided between the deionized water supply tank (24) and the medium-pressure PEM electrolyzer (30) of the object to be measured; a pressure-resistant water supply pump (32), a pressure-resistant rapid heater (33), a contactless water flow meter (34), and an electrolyzer water supply valve (35) are provided on the branch line in sequence; The hydrogen water separation tank (1) is provided with an H2 inlet pipeline, on which an online analyzer (5) for oxygen in hydrogen is provided; the oxygen water separation tank (15) is provided with an O2 inlet pipeline, on which an online analyzer (14) for hydrogen in oxygen is provided; and the N2 inlet pipeline is respectively connected to the pipeline between the hydrogen water separation tank (1) and the medium-pressure PEM electrolyzer (30) of the object to be measured, and the pipeline between the deionized water supply tank (24) and the medium-pressure PEM electrolyzer (30) of the object to be measured.
2. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 1 is characterized in that: A hydrogen back pressure valve (2), a hydrogen discharge solenoid valve (3) and a hydrogen mass flow meter (4) are sequentially arranged between the hydrogen water separation tank (1) and the hydrogen-oxygen online analyzer (5).
3. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 1 is characterized in that: An oxygen back pressure valve (11), an oxygen discharge electromagnetic valve (12), and an oxygen mass flow meter (13) are sequentially arranged between the oxygen water separation tank (15) and the oxygen-hydrogen online analyzer (14).
4. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 1 is characterized in that: A pipeline between the N2 inlet pipeline connected to the hydrogen water separation tank (1) and the medium-pressure PEM electrolyzer (30) of the object to be measured is provided with a hydrogen and nitrogen auxiliary pressure flow controller (26) and a hydrogen and nitrogen auxiliary pressure solenoid valve (27) in sequence, and a pipeline between the N2 inlet pipeline connected to the deionized water supply tank (24) and the medium-pressure PEM electrolyzer (30) of the object to be measured is provided with an oxygen and nitrogen auxiliary pressure flow controller (28) and an oxygen and nitrogen auxiliary pressure solenoid valve (29) in sequence.
5. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 1 is characterized in that: The pipeline from the hydrogen water separation tank (1) to the deionized water supply tank (24) is provided with three branches, namely a hydrogen drainage port, a water replenishment port, and an oxygen drainage port.
6. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 5 is characterized in that: A hydrogen main drainage electromagnetic valve (8), a hydrogen water separation tank medium-pressure drainage valve (7), and a hydrogen water separation tank medium-pressure drainage flow controller (6) are sequentially arranged between the hydrogen drainage outlet and the pipeline from the hydrogen water separation tank (1) to the deionized water supply tank (24); a branch is also arranged between the hydrogen main drainage electromagnetic valve (8) and the hydrogen water separation tank medium-pressure drainage valve (7) to connect the pipeline from the hydrogen water separation tank (1) to the deionized water supply tank (24), and a hydrogen low-pressure drainage valve (9) is arranged on the pipeline.
7. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 5 is characterized in that: Two parallel branches are provided between the water replenishment port and the pipeline from the hydrogen water separation tank (1) to the deionized water supply tank (24), one of which is provided with a low-pressure water replenishment pump (20), the pipeline leading to the hydrogen water separation tank (1) is provided with a hydrogen low-pressure water replenishment valve (17), and the pipeline leading to the deionized water supply tank (24) is provided with an oxygen low-pressure water replenishment valve (19); the other branch is provided with a plunger pump (22), the pipeline leading to the hydrogen water separation tank (1) is provided with a hydrogen medium-pressure water replenishment valve (18), and the pipeline leading to the deionized water supply tank (24) is provided with an oxygen medium-pressure water replenishment valve (21).
8. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 5 is characterized in that: Two parallel branches are provided between the oxygen drainage port and the pipeline from the hydrogen water separation tank (1) to the deionized water supply tank (24), and the two branches are respectively provided with an oxygen medium-pressure drainage valve (16) and an oxygen low-pressure drainage valve (23).
9. The medium-pressure low-power PEM hydrogen production and water electrolysis test device according to claim 1 is characterized in that: The deionized water supply tank (24) is also provided with a branch line connected to a pipeline between a pressure-resistant water supply pump (32) and a pressure-resistant rapid heater (33), and a pressure-resistant deionizer (31) is provided on the branch line.