Alkaline electrolytic water hydrogen production system resistant to high pressure difference and fluctuation operation and implementation method

Abstract

The invention discloses an alkaline electrolytic water hydrogen production system resistant to high pressure difference and fluctuation operation. The alkaline electrolytic water hydrogen production system comprises a hydrogen separator and an oxygen separator, and an electrolytic bath is arranged between the hydrogen separator and the oxygen separator; the alkaline water electrolysis hydrogen production system further comprises an alkaline liquor circulation unit, the alkaline liquor circulation unit comprises a hydrogen side circulation loop and an oxygen side circulation loop which are independent of each other, the hydrogen side circulation loop is connected with the hydrogen separator and the electrolytic cell, and the oxygen side circulation loop is connected with the oxygen separator and the electrolytic cell. The method has the following advantages that the problems that a traditional system is low in differential pressure tolerance and insufficient in load response capacity are solved, and the operation stability and safety of the system under the fluctuation working condition are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production by water electrolysis, and in particular to an alkaline water electrolysis hydrogen production system capable of stable operation at a relatively high hydrogen-oxygen pressure difference and having the ability to quickly respond to load fluctuations, and a control method thereof. BACKGROUND

[0002] Alkaline water electrolysis hydrogen production is a mature large-scale hydrogen production technology, but during operation, the hydrogen-oxygen pressure difference on both sides is required to be strictly controlled within a relatively low range (usually not higher than 0.01 bar). If the pressure difference is too large, the liquid level difference between the hydrogen and oxygen separators will significantly increase, causing the system to interlock and shut down, seriously affecting the operation continuity and hydrogen production efficiency. Especially in application scenarios where the renewable energy supply fluctuates greatly, the system needs to frequently respond to load changes, and the real-time and reliability of pressure balance control are extremely high requirements.

[0003] In the prior art, as shown in Figure 1 There is a communication pipe between the oxygen separator and the hydrogen separator, and the gas pressure difference on both sides of hydrogen and oxygen needs to be strictly controlled (<0.1 bar) to ensure that the liquid level difference on both sides of hydrogen and oxygen is less than 100 mm. If the liquid level difference on both sides of hydrogen and oxygen is greater than 100 mm, the system will interlock and shut down, and the electrolytic cell will no longer be maintained. The oxygen separator and the hydrogen separator are each connected to a regulating valve, and the pressure difference on both sides of hydrogen and oxygen is controlled entirely by the regulating valves on both sides of hydrogen and oxygen. The regulating valve requires more adjustment time and higher adjustment accuracy. As long as the electrolytic cell load changes too much, the regulating valve is prone to cause a large pressure difference due to untimely adjustment, leading to system interlocking and shutdown, making it difficult to adapt to wide load fluctuation operation, poor anti-interference ability, frequent system start and stop, and restricting its large-scale coupling application with fluctuating power sources. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a high-pressure-difference-resistant and anti-fluctuation alkaline water electrolysis hydrogen production system and method to solve the problems of low pressure difference tolerance and insufficient load response capability of traditional systems, and to significantly improve the operation stability and safety of the system under fluctuating conditions.

[0005] To solve the above technical problems, the following technical solutions are adopted: A high-pressure-difference-resistant and anti-fluctuation alkaline water electrolysis hydrogen production system, comprising a hydrogen separator and an oxygen separator, and an electrolytic cell arranged between the hydrogen separator and the oxygen separator; The alkaline water electrolysis hydrogen production system further comprises an alkali solution circulation unit, which comprises a hydrogen-side circulation loop and an oxygen-side circulation loop that are independent of each other, the hydrogen-side circulation loop is connected to the hydrogen separator and the electrolytic cell, and the oxygen-side circulation loop is connected to the oxygen separator and the electrolytic cell; The alkaline water electrolysis hydrogen production system further comprises a PLC control center, the PLC control center is connected with an execution unit, a liquid level detection unit and a pressure detection unit, receives pressure and liquid level detection signals, controls the opening degree of the hydrogen side pressure regulating valve to adjust the hydrogen side pressure, and controls the fluid transfer between the buffer tank and the hydrogen separator and the oxygen separator to balance the liquid level and the alkali concentration.

[0006] Further, the hydrogen side circulation loop comprises a hydrogen side circulation pump installed on the pipeline between the electrolytic cell and the hydrogen separator, and the oxygen side circulation loop comprises an oxygen side circulation pump installed on the pipeline between the electrolytic cell and the oxygen separator, and the oxygen side circulation pump and the hydrogen side circulation pump are connected with the PLC control center.

[0007] Further, the hydrogen separator is connected with a buffer tank, a hydrogen side liquid discharge ball valve is installed on the pipeline between the hydrogen separator and the buffer tank, and the oxygen separator is connected with a buffer tank, an oxygen side liquid discharge ball valve is installed on the pipeline between the oxygen separator and the buffer tank.

[0008] Further, the alkaline water electrolysis hydrogen production system further comprises a liquid supplementing unit, the liquid supplementing unit comprises a buffer tank, the buffer tank is connected with a water tank through a pipeline, the buffer tank is connected with a 1# differential pressure transmitter, and the 1# differential pressure transmitter monitors the liquid level height of the buffer tank.

[0009] Further, a liquid supplementing pump, an oxygen side liquid supplementing ball valve and a hydrogen side liquid supplementing ball valve are installed on the pipeline connecting the buffer tank with the top of the hydrogen separator and the oxygen separator, the oxygen side liquid supplementing ball valve is arranged on the pipeline connecting the top of the oxygen separator, and the hydrogen side liquid supplementing ball valve is arranged on the pipeline connecting the top of the hydrogen separator.

[0010] Further, the alkaline water electrolysis hydrogen production system further comprises a pressure detection unit, the pressure detection unit comprises a pressure sensor, a pressure transmitter and a differential pressure transmitter, the pressure sensor is arranged at the top of the hydrogen separator and the oxygen separator, the pressure transmitter is installed on the oxygen separator, and the hydrogen separator and the oxygen separator are both connected with a differential pressure transmitter for detecting the pressure difference between the hydrogen separator and the oxygen separator.

[0011] Further, the alkaline water electrolysis hydrogen production system further comprises a liquid level detection unit, the liquid level detection unit comprises an oxygen side differential pressure transmitter and a hydrogen side differential pressure transmitter, the oxygen side differential pressure transmitter and the hydrogen side differential pressure transmitter are arranged on the oxygen separator and the hydrogen separator respectively, the oxygen side differential pressure transmitter is used for monitoring the oxygen side liquid level, and the hydrogen side differential pressure transmitter is used for monitoring the hydrogen side liquid level.

[0012] Further, the alkaline water electrolysis hydrogen production system further comprises an execution unit, the execution unit comprises a hydrogen side pressure regulating valve arranged on the hydrogen gas output pipeline and an oxygen side pressure regulating valve arranged on the oxygen gas output pipeline.

[0013] Further, the diaphragm of the electrolytic cell is a composite reinforced porous diaphragm.

[0014] The implementation method of the high-pressure difference and anti-fluctuation operation resistant alkaline electrolytic water hydrogen production system comprises the following steps: Step 1, the pressure on the oxygen side is monitored through a pressure transmitter, and then the pressure signal is transmitted to the PLC control center, then the PLC control center compares with the set pressure, and then controls the oxygen side regulating valve to control the system pressure; Step 2, the hydrogen-oxygen pressure balance is monitored by a differential pressure transmitter, and then the pressure difference signal is transmitted to the PLC control center, then the PLC control center compares with the set pressure difference, and then controls the hydrogen side regulating valve to control the hydrogen-oxygen pressure balance; Step 3, the pressure balance and the liquid level balance are separated, and since the electrolytic cell reduces the permeation of the electrolyte solution, the liquid level height balance adjustment in the hydrogen-oxygen separator needs to be balanced by the buffer tank. First, the oxygen side liquid level height is monitored by an oxygen side differential pressure transmitter, the hydrogen side liquid level height is monitored by a hydrogen side differential pressure transmitter, the hydrogen-oxygen liquid level height signal is transmitted to the PLC control center and compared with the set liquid level difference, and then the PLC control center controls the hydrogen side liquid discharge ball valve or the oxygen side liquid discharge ball valve to open, whichever side the separator liquid level is high, the corresponding pneumatic ball valve is controlled to open the liquid discharge, and the liquid is discharged to the liquid level lower than the set difference liquid level; Step 4, the PLC control center compares the sum of the hydrogen-oxygen separator liquid level heights transmitted in real time with the designed water replenishment liquid level, controls the liquid replenishment pump to replenish liquid, and when the liquid replenishment pump is opened, the differential pressure transmitter of the buffer tank monitors the real-time liquid level height, when the liquid level height is higher than the set liquid level height in the PLC control center, the buffer tank bottom outlet ball valve is opened, the water tank outlet ball valve is closed, and the oxygen side liquid replenishment ball valve or the hydrogen side liquid replenishment ball valve is controlled respectively to replenish the hydrogen-oxygen separator liquid level to the set liquid level height, when the liquid level height of the buffer tank is lower than the set liquid level height in the PLC control center, the buffer tank bottom outlet ball valve is closed, the water tank outlet ball valve is opened, and the separator is respectively replenished with water; Step 5, a part of the liquid in the hydrogen-oxygen separator is discharged into the buffer tank in the form of setting periodical, this step controls the hydrogen side liquid discharge ball valve or the oxygen side liquid discharge ball valve at the bottom of the hydrogen-oxygen separator to be opened respectively through the PLC control center, the set liquid in the hydrogen-oxygen separator is discharged into the buffer tank for mixing, and then through the same step as step 4, the mixed electrolyte solution in the buffer tank is replenished into the hydrogen-oxygen separator again, so that the electrolyte solution concentration can be controlled within a suitable concentration range.

[0015] Compared with the prior art, the above technical scheme has the following technical effects: By enhancing the diaphragm pressure resistance and the double-loop independent circulation design, the system can withstand higher pressure difference, and the adaptability to input power fluctuation is significantly improved; The introduction of an external buffer tank and a liquid level balancing mechanism effectively solves the problems of liquid level imbalance caused by pressure difference and performance instability caused by concentration difference. Decoupled control of pressure and liquid level, combined with differential pressure and oxygen-side pressure feedback, improves pressure regulation accuracy and system dynamic response speed; The system boasts high safety, significantly reduces the risk of hydrogen-oxygen mixing, and is suitable for hydrogen production scenarios involving highly volatile renewable energy sources. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the structure of the water electrolysis hydrogen production system in the background art of the present invention; Figure 2 This is a schematic diagram of the structure of the water electrolysis hydrogen production system in an embodiment of the present invention. Detailed Implementation

[0018] Examples, such as Figure 2 As shown, an alkaline water electrolysis hydrogen production system that is resistant to high pressure differential and fluctuation operation includes a hydrogen separator 2, an oxygen separator 1, and an electrolysis cell 3 between the hydrogen separator 2 and the oxygen separator 1.

[0019] The alkaline water electrolysis hydrogen production system also includes an alkaline solution circulation unit, which comprises independent hydrogen-side circulation loops and oxygen-side circulation loops. The hydrogen-side circulation loop connects the hydrogen separator 2 and the electrolyzer 3, and the oxygen-side circulation loop connects the oxygen separator 1 and the electrolyzer 3. The hydrogen-side circulation loop includes a hydrogen-side circulation pump 6, which is installed on the pipeline between the electrolyzer 3 and the hydrogen separator 2. The hydrogen separator 2 is connected to a buffer tank 4, and a hydrogen-side drain ball valve 18 is installed on the pipeline between the hydrogen separator 2 and the buffer tank 4. The oxygen-side circulation loop includes an oxygen-side circulation pump 5, which is installed on the pipeline between the electrolyzer 3 and the oxygen separator 1. The oxygen separator 1 is connected to the buffer tank 4, and an oxygen-side drain ball valve 17 is installed on the pipeline between the oxygen separator 1 and the buffer tank 4. The oxygen flow goes from the oxygen separator 1 to the oxygen-side circulation pump 5, then to the electrolyzer 3, and then back to the oxygen separator 1; the hydrogen flow goes from the hydrogen separator 2 to the hydrogen-side circulation pump 6, then to the electrolyzer 3, and finally back to the hydrogen separator 2.

[0020] The alkaline electrolytic water hydrogen production system further comprises a liquid supplementing unit, the liquid supplementing unit comprises a buffer tank 4, the buffer tank 4 is communicated with a water tank 19 through a pipeline, the water tank 19 is connected with a 2# differential pressure transmitter 20, the 2# differential pressure transmitter 20 monitors the liquid level of the water tank 19, the buffer tank 4 is connected with a 1# differential pressure transmitter 13, the 1# differential pressure transmitter 13 monitors the liquid level of the buffer tank 4, the inlet of the buffer tank 4 is communicated with the bottom of the hydrogen separator and the oxygen separator through a pipeline, the outlet of the buffer tank 4 is communicated with the top of the hydrogen separator and the oxygen separator through a pipeline, a liquid supplementing pump 7, an oxygen side liquid supplementing ball valve 15 and a hydrogen side liquid supplementing ball valve 16 are installed on the pipeline communicating the buffer tank 4 with the top of the hydrogen separator and the oxygen separator, the oxygen side liquid supplementing ball valve 15 is arranged on the pipeline communicating the top of the oxygen separator, and the hydrogen side liquid supplementing ball valve 16 is arranged on the pipeline communicating the top of the hydrogen separator.

[0021] The alkaline electrolytic water hydrogen production system further comprises a pressure detection unit, the pressure detection unit comprises a pressure sensor, a pressure transmitter 14 and a differential pressure transmitter 10, the pressure sensor is arranged at the top of the hydrogen separator 2 and the oxygen separator 1, the pressure transmitter 14 is installed on the oxygen separator 1, and the hydrogen separator 2 and the oxygen separator 1 are both connected with the differential pressure transmitter 10, which is used for detecting the pressure difference of the hydrogen separator 2 and the oxygen separator 1.

[0022] The alkaline electrolytic water hydrogen production system further comprises a liquid level detection unit, the liquid level detection unit comprises an oxygen side differential pressure transmitter 11 and a hydrogen side differential pressure transmitter 12, the oxygen side differential pressure transmitter 11 and the hydrogen side differential pressure transmitter 12 are arranged in the oxygen separator and the hydrogen separator respectively, the oxygen side differential pressure transmitter 11 is used for monitoring the oxygen side liquid level, and the hydrogen side differential pressure transmitter 12 is used for monitoring the hydrogen side liquid level.

[0023] The alkaline electrolytic water hydrogen production system further comprises an execution unit, the execution unit comprises a hydrogen side pressure regulating valve 9 arranged on the hydrogen gas output pipeline and an oxygen side pressure regulating valve 8 arranged on the oxygen gas output pipeline.

[0024] The alkaline electrolytic water hydrogen production system further comprises a PLC control center, the PLC control center is connected with the execution unit, the liquid level detection unit, the pressure detection unit, a hydrogen side circulating pump 6, an oxygen side circulating pump 5 and a liquid supplementing pump 7, receives pressure and liquid level detection signals, controls the opening degree of the hydrogen side pressure regulating valve to adjust the hydrogen side pressure, and controls the fluid transfer between the buffer tank and the hydrogen separator 2 and the oxygen separator 1 to balance the liquid level and the alkali concentration.

[0025] An implementation method of an alkaline electrolytic water hydrogen production system resistant to high pressure difference and fluctuation operation, comprising the following steps: Step 1, pressure monitoring is performed on the oxygen side through the pressure transmitter 14, then the pressure signal is transmitted to the PLC control center, then the PLC control center compares with the set pressure, and then the oxygen side regulating valve 8 is controlled to control the system pressure.

[0026] Step 2, the pressure balance between hydrogen and oxygen is monitored by differential pressure transmitter 10, then the pressure difference signal is transmitted to PLC control center, then the PLC control center compares with the set pressure difference, then controls the hydrogen side regulating valve 9 to control the pressure balance between hydrogen and oxygen.

[0027] Step 3, the pressure balance and liquid level balance are separated, and since the electrolytic cell reduces the permeability of the electrolyte solution, the liquid level balance adjustment in the hydrogen and oxygen separator needs to be balanced by the buffer tank. First, the oxygen side liquid level is monitored by the oxygen side differential pressure transmitter 11, and the hydrogen side liquid level is monitored by the hydrogen side differential pressure transmitter 12. The hydrogen and oxygen liquid level signals are transmitted to the PLC control center and compared with the set liquid level difference. Then the PLC control center controls the hydrogen side liquid discharge ball valve 18 or the oxygen side liquid discharge ball valve 17 to open, whichever side the separator liquid level is high, the corresponding pneumatic ball valve is controlled to open the liquid discharge to the liquid level below the set difference liquid level.

[0028] Step 4, the PLC control center compares the sum of the real-time transmitted hydrogen and oxygen separator liquid level with the designed water replenishment liquid level, controls the liquid replenishment pump 7 to replenish liquid, and when the liquid replenishment pump is opened, the differential pressure transmitter 13 of the buffer tank 4 monitors the real-time liquid level, when the liquid level is higher than the set liquid level in the PLC control center, the buffer tank bottom outlet ball valve is opened, the water tank outlet ball valve is closed, and the oxygen side liquid replenishment ball valve 15 or the hydrogen side liquid replenishment ball valve 16 is controlled respectively to replenish the hydrogen and oxygen separator liquid level to the set liquid level. When the liquid level in the buffer tank 4 is lower than the set liquid level in the PLC control center, the buffer tank bottom outlet ball valve is closed, the water tank outlet ball valve is opened, and the separator is separately replenished with water.

[0029] Step 5, the communication pipe and the permeability of the electrolyte in the electrolytic cell are reduced, and during the long-term electrolysis process, the electrolyte concentration on the hydrogen and oxygen sides will change, resulting in inconsistent electrolyte concentration. By setting a regular liquid discharge from the hydrogen and oxygen separator to the buffer tank, this step controls the hydrogen side liquid discharge ball valve 18 or the oxygen side liquid discharge ball valve 17 at the bottom of the hydrogen and oxygen separator to be opened by the PLC control center, and the set liquid in the hydrogen and oxygen separator is discharged to the buffer tank for mixing. Then, through the same steps as step 4, the mixed electrolyte solution in the buffer tank is again replenished into the hydrogen and oxygen separator, so that the electrolyte solution concentration can be controlled within the appropriate concentration range.

[0030] The electrolytic cell diaphragm is a composite reinforced porous diaphragm, with a burst pressure not less than 1.0 bar and a gas cross permeability lower than that of traditional diaphragms.

[0031] The hydrogen side and the oxygen side alkali solution circulation loop are completely independent. The differential pressure transmitter 10 detects the pressure difference of the hydrogen separator 2 and the oxygen separator 1, and the signal is transmitted to the control system. The control system maintains the pressure balance by adjusting the opening degree of the hydrogen side pressure regulating valve, so that the hydrogen-oxygen pressure difference is maintained in the range of -0.5 bar to +0.5 bar. The hydrogen side differential pressure transmitter and the oxygen side differential pressure transmitter monitor the liquid level of the separator in real time. If the liquid level deviation exceeds the allowable value, the corresponding valve is opened, the alkali solution is introduced from the high liquid level side to the buffer tank, and then is pumped into the low liquid level side through the liquid supplementing pump.

[0032] The system can continuously and stably operate for more than 5 minutes under a pressure difference of 0.5 bar, and quickly responds to fluctuations of ±50% of the rated load. It is suitable for direct coupling hydrogen production of fluctuating power sources such as wind power and photovoltaic power.

[0033] The volume of the external buffer tank is not less than 20% of the effective volume of the separator, and the inlet and outlet of the external buffer tank are provided with control valves and are interlocked with the liquid level signal.

[0034] The description of the present application is given for the purpose of illustration and description, and is not exhaustive or limiting to the present application. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles and practical application of the present application, and to enable those of ordinary skill in the art to understand the present application in order to design various embodiments with various modifications for specific use.

Claims

1. An alkaline water electrolysis hydrogen production system resistant to high pressure differential and fluctuation operation, characterized in that: The hydrogen separator (2) and the oxygen separator (1) are connected by an electrolytic cell (3); The alkaline electrolytic water hydrogen production system further comprises an alkali solution circulating unit, the alkali solution circulating unit comprises a hydrogen side circulating loop and an oxygen side circulating loop which are independent of each other, the hydrogen side circulating loop is connected with the hydrogen separator (2) and the electrolytic cell (3), and the oxygen side circulating loop is connected with the oxygen separator (1) and the electrolytic cell (3). The alkaline electrolytic water hydrogen production system further comprises a PLC control center, the PLC control center is connected with an execution unit, a liquid level detection unit and a pressure detection unit, receives pressure and liquid level detection signals, controls the opening degree of the hydrogen side pressure regulating valve to adjust the hydrogen side pressure, and controls the fluid transfer between the buffer tank and the hydrogen separator (2) and the oxygen separator (1) to balance the liquid level and the alkali concentration.

2. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The hydrogen side circulating loop comprises a hydrogen side circulating pump (6), the hydrogen side circulating pump (6) is installed on a pipeline between the electrolytic cell (3) and the hydrogen separator (2), the oxygen side circulating loop comprises an oxygen side circulating pump (5), the oxygen side circulating pump (5) is installed on a pipeline between the electrolytic cell (3) and the oxygen separator (1), and the oxygen side circulating pump (5) and the hydrogen side circulating pump (6) are connected with the PLC control center.

3. The alkaline water electrolysis hydrogen production system with high pressure differential resistance and fluctuation resistance as described in claim 1, characterized in that: The hydrogen separator (2) is connected with the buffer tank (4), a hydrogen side liquid discharge ball valve (18) is installed on a pipeline between the hydrogen separator (2) and the buffer tank (4), the oxygen separator (1) is connected with the buffer tank (4), and an oxygen side liquid discharge ball valve (17) is installed on a pipeline between the oxygen separator (1) and the buffer tank (4).

4. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The alkaline electrolytic water hydrogen production system further comprises a liquid supplementing unit, the liquid supplementing unit comprises the buffer tank (4), the buffer tank (4) is connected with a water tank (19) through a pipeline, the buffer tank (4) is connected with a 1# differential pressure transmitter (13), and the 1# differential pressure transmitter (13) monitors the liquid level height of the buffer tank (4).

5. The hydrogen production system of claim 4, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The buffer tank (4) is connected with the hydrogen separator and the oxygen separator through pipelines, and a liquid supplementing pump (7), an oxygen side liquid supplementing ball valve (15) and a hydrogen side liquid supplementing ball valve (16) are installed on the pipelines, the oxygen side liquid supplementing ball valve (15) is arranged on a pipeline connected with the top of the oxygen separator, and the hydrogen side liquid supplementing ball valve (16) is arranged on a pipeline connected with the top of the hydrogen separator.

6. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The alkaline electrolytic water hydrogen production system further comprises a pressure detection unit, the pressure detection unit comprises a pressure sensor, a pressure transmitter (14) and a differential pressure transmitter (10), the pressure sensor is arranged at the top of the hydrogen separator (2) and the oxygen separator (1), the pressure transmitter (14) is installed on the oxygen separator (1), the hydrogen separator (2) and the oxygen separator (1) are both connected with the differential pressure transmitter (10), and the differential pressure transmitter (10) is used for detecting the pressure difference between the hydrogen separator (2) and the oxygen separator (1).

7. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The alkaline electrolytic water hydrogen production system further comprises a liquid level detection unit, the liquid level detection unit comprises an oxygen side differential pressure transmitter (11) and a hydrogen side differential pressure transmitter (12), the oxygen side differential pressure transmitter (11) and the hydrogen side differential pressure transmitter (12) are arranged in the oxygen separator and the hydrogen separator respectively, the oxygen side differential pressure transmitter (11) is used for monitoring the oxygen side liquid level, and the hydrogen side differential pressure transmitter (12) is used for monitoring the hydrogen side liquid level.

8. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The alkaline water electrolysis hydrogen production system further comprises an execution unit, which comprises a hydrogen side pressure regulating valve (9) arranged on the hydrogen output pipeline and an oxygen side pressure regulating valve (8) arranged on the oxygen output pipeline.

9. The hydrogen production system of claim 1, wherein the hydrogen production system is capable of operating at a high pressure difference and is resistant to fluctuations in operation. The diaphragm of the electrolytic cell (3) is a composite reinforced porous diaphragm.

10. A method for implementing a high-pressure-difference-resistant and fluctuation-resistant operation of an alkaline electrolytic water hydrogen production system, characterized by: The implementation method is applied to the high-pressure difference resistant and fluctuation resistant running alkaline water electrolysis hydrogen production system as claimed in any one of claims 1-9, and comprises the following steps: Step 1: The pressure on the oxygen side is monitored by a pressure transmitter (14), and then the pressure signal is transmitted to the PLC control center, and then the PLC control center compares with the set pressure, and then controls the oxygen side regulating valve (8) to control the system pressure; Step 2: The hydrogen-oxygen pressure balance is monitored by a differential pressure transmitter (10) to monitor the pressure difference between the hydrogen and oxygen sides, and then the pressure difference signal is transmitted to the PLC control center, and then the PLC control center compares with the set pressure difference, and then controls the hydrogen side regulating valve (9) to control the hydrogen-oxygen pressure balance; Step 3: The pressure balance and the liquid level balance are separated, and since the electrolytic cell reduces the permeation of the electrolyte solution, the liquid level height balance adjustment in the hydrogen-oxygen separator needs to be balanced by the buffer tank; First, the oxygen side liquid level height is monitored by an oxygen side differential pressure transmitter (11), and the hydrogen side liquid level height is monitored by a hydrogen side differential pressure transmitter (12), and the hydrogen-oxygen liquid level height signal is transmitted to the PLC control center and compared with the set liquid level difference, and then the PLC control center controls the hydrogen side liquid discharge ball valve (18) or the oxygen side liquid discharge ball valve (17) to open, whichever side has a higher liquid level in the separator, the corresponding pneumatic ball valve is opened to discharge liquid, and the liquid is discharged to the liquid level below the set difference liquid level; Step 4: The PLC control center compares the sum of the real-time transmitted hydrogen-oxygen separator liquid level heights with the designed water replenishment liquid level, controls the water replenishment pump (7) to replenish water, and when the water replenishment pump is opened, the differential pressure transmitter (13) of the buffer tank (4) monitors the real-time liquid level height, and when the liquid level height is higher than the set liquid level height in the PLC control center, the buffer tank bottom outlet ball valve is opened, the water tank outlet ball valve is closed, and the oxygen side water replenishment ball valve (15) or the hydrogen side water replenishment ball valve (16) is controlled respectively to replenish the liquid level in the hydrogen-oxygen separator to the set liquid level height, and when the liquid level height of the buffer tank (4) is lower than the set liquid level height in the PLC control center, the buffer tank bottom outlet ball valve is closed, the water tank outlet ball valve is opened, and the separator is respectively replenished with water; Step 5: A part of the liquid in the hydrogen-oxygen separator is discharged into the buffer tank in a set period, and this step controls the hydrogen side liquid discharge ball valve (18) or the oxygen side liquid discharge ball valve (17) at the bottom of the hydrogen-oxygen separator to be opened by the PLC control center, discharges the set liquid in the hydrogen-oxygen separator into the buffer tank for mixing, and then the buffer tank is replenished with the mixed electrolyte solution into the hydrogen-oxygen separator by the same steps as step 4, so that the electrolyte solution concentration can be controlled within a suitable concentration range.

Images