Accurate and rapid hydrogen-oxygen side pressure and liquid level adjusting system for hydrogen production equipment

Abstract

The invention relates to an accurate and rapid hydrogen-oxygen side pressure and liquid level adjusting system for hydrogen production equipment, which comprises a gas-liquid separator, a condenser and a gas flow adjusting module, and the gas flow adjusting module comprises a pressure gauge, a pneumatic valve, an adjusting valve, a stop valve and a gas flowmeter. And the pneumatic valve and the adjusting valve are used for adjusting the gas flow of the exhaust pipeline, so that the gas yield and the gas displacement of the hydrogen production equipment are kept in dynamic balance, and the internal pressure of the hydrogen production equipment is kept at a set value. According to the designed pressure liquid level adjusting system, the single adjusting valve and the multiple pneumatic valves are adopted for cooperative control, the pneumatic valves serve as the main adjusting valve and the auxiliary adjusting valve, gas flow is rapidly and roughly adjusted through the pneumatic valves, and then supplementing and precise adjusting are conducted through the adjusting valves. The flow regulating valve has the advantages that the requirements of upper and lower limits of flow on the specification size of the regulating valve are reduced, a smaller and higher-precision regulating valve can be adopted for regulation, and the regulation precision and the regulation speed are improved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy and water electrolysis hydrogen production, and in particular to an accurate and fast hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment. Background Art

[0002] At present, domestic renewable energy hydrogen production is in its infancy. How to design and integrate corresponding equipment for renewable energy coupled hydrogen production needs, improve adaptability to renewable energy fluctuations, achieve efficient use of renewable energy, and ensure safe, low-carbon, stable, efficient, and economical operation of the hydrogen production system is an urgent problem to be solved.

[0003] Alkaline water electrolysis hydrogen production technology is relatively mature and is one of the main solutions currently used for large-scale renewable energy hydrogen production at home and abroad. Alkaline water electrolysis hydrogen production equipment is mainly composed of an electrolytic cell and a diaphragm. Compared with other forms of hydrogen production equipment, its structure is simple and the price is cheap. Alkaline water electrolysis hydrogen production technology has stable operation, high maturity and low investment cost, but currently there are problems such as slow adjustment speed, low adjustment accuracy and narrow adjustable range when coupled with fluctuating power sources, which makes hydrogen production equipment less adaptable to fluctuating power sources.

[0004] From the electrolyzer side, other parameters need to be adjusted to ensure system safety. By changing parameters such as operating temperature and electrolyte circulation volume, technical approaches can be found to ensure safe and stable operation of the water electrolysis hydrogen production system under complex power fluctuation conditions. In addition, the hydrogen production equipment itself requires a lot of auxiliary equipment and modules to complete functions such as system status detection, temperature control, air pressure detection, gas drying and purification. For the fluctuating power supply coupled hydrogen production system, these auxiliary equipment and modules need to be independently designed and have good fault redundancy operation capabilities.

[0005] At present, in terms of pressure and liquid level regulation on the hydrogen and oxygen side, alkaline water electrolysis hydrogen production equipment has two main problems: the flow control is unstable when operating at low power and low flow; the single-group regulating valve has slow flow regulation due to the adjustment speed of the regulating valve instrument itself, and has poor adaptability to fluctuating power sources when coupled with renewable energy generation.

[0006] Therefore, optimizing the design of the pressure and liquid level regulation system, improving the control accuracy, stability and regulation speed, and improving the adaptability of hydrogen production equipment to fluctuating power sources are among the issues that need to be urgently addressed in hydrogen production equipment. Summary of the invention

[0007] In view of the deficiencies of the above-mentioned prior art, the present invention provides a precise and fast pressure and liquid level regulation system for the hydrogen and oxygen sides of hydrogen production equipment, which effectively improves the regulation accuracy and regulation speed of the pressure and liquid level on the hydrogen and oxygen sides of the hydrogen production equipment, and makes a redundant design to improve the adaptability of the hydrogen production equipment to fluctuating power supplies.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: A precise and rapid hydrogen and oxygen side pressure and liquid level regulating system for hydrogen production equipment, characterized in that: it comprises a gas-liquid separator, a condenser, and a gas flow regulating module; hydrogen and oxygen generated by electrolysis of water in the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow regulating modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow regulating modules on the hydrogen side and the oxygen side.

[0009] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module comprises a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, a gas flow meter and several branches, the pressure gauge is installed on the pipe connecting the gas flow module and the condenser, one group of branches is installed with a regulating valve, a gas flow meter is designed on the rear side of the regulating valve and installed on the same branch, and each of the remaining groups of branches is respectively installed with a pneumatic valve, a gas flow meter is designed on the rear side of the pneumatic valve and installed on the same branch; a stop valve is respectively installed at both ends of each group of branches, and several branches are connected in parallel.

[0010] The pneumatic valves are provided in multiple groups, each group controls a certain percentage of the rated gas flow, one group of pneumatic valves is for standby use, and the rest are for regular use.

[0011] The upper limit of the gas flow rate of the regulating valve is a certain percentage of the rated gas flow rate, which should not be too large, otherwise it will affect the control accuracy of the regulating valve. The upper limit of the gas flow rate regulating module is the sum of the upper limits of the gas flow rate regulating amounts of the common pneumatic valve branch and the regulating valve branch.

[0012] After the actual pressure inside the system is detected by the pressure gauge, the pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC sends a signal to the pneumatic valve and the regulating valve according to the program design. The pneumatic valve is used as the main valve and the regulating valve is used as the auxiliary valve to control the gas flow, maintain a dynamic balance between the system's gas output and gas discharge, and stabilize the pressure inside the system at the set value required by the user.

[0013] The pneumatic valve is a pneumatic two-way ball valve, and the regulating valve is a pneumatic diaphragm regulating valve.

[0014] When the internal pressure of the system is different, the actual gas flow of each branch is also different. The actual gas flow of the regulating valve branch needs to be controlled according to the value of the gas flow meter on the pneumatic valve branch. When designing the pipeline, the pressure drop of each branch should be kept consistent as much as possible.

[0015] Compared with the existing technology, it has the following advantages and effects: 1. Reduce the adjustment range of the regulating valve, improve the control accuracy and flow stability, effectively reduce the error between the system flow setting value and the actual flow, improve the stability of the system pressure, and achieve precise control.

[0016] 2. The gas flow rate adjustment range is wide, corresponding to the fluctuations in renewable energy power generation, and improving the adaptability of hydrogen production equipment to power supply fluctuations.

[0017] 3. One group of multiple pneumatic valves is used as a standby while the other groups are used regularly. Even if one of the pneumatic valves fails, the standby pneumatic valve can be activated to maintain the continuity and reliability of the hydrogen production system.

[0018] 4. Traditional large-flow diaphragm control valves have a long adjustment time and slow response, which poses a safety hazard when operating under variable operating conditions. The pneumatic valve has a fast switching speed and can quickly adjust the valve opening in conjunction with the control valve while ensuring the adjustment accuracy. It can quickly follow the changes in hydrogen production due to unstable power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the pressure and liquid level regulating system on the hydrogen and oxygen sides of the hydrogen production equipment of the present invention (the structure of the hydrogen and oxygen sides is the same).

[0020] 1-gas-liquid separator, 2-condenser, 3-pressure gauge, 4-stop valve, 5-regulating valve, 6-gas flow meter, 7-pneumatic valve. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below by way of examples, which are intended to explain the present invention but are not intended to be limited to the following examples: See attached Figure 1 A precise and rapid hydrogen and oxygen side pressure and liquid level regulating system for hydrogen production equipment comprises a gas-liquid separator 1, a condenser 2, and a gas flow regulating module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator 1 through a pipeline; the separated hydrogen and oxygen enter the gas flow regulating modules on the hydrogen side and the oxygen side respectively after passing through the condenser 2; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow regulating modules on the hydrogen side and the oxygen side. The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module comprises a pressure gauge 3, a pneumatic valve 7, a regulating valve 5, a stop valve 4, a gas flow meter 6 and several branches, the pressure gauge 3 is installed on the pipe connecting the gas flow module and the condenser 2, one group of branches is installed with a regulating valve 5, a gas flow meter 6 is designed to be installed on the same branch at the rear side of the regulating valve 5, and each of the other groups of branches is respectively installed with a pneumatic valve 7, a gas flow meter 6 is designed to be installed on the same branch at the rear side of the pneumatic valve 7; a stop valve 4 is respectively installed at both ends of each group of branches, and several branches are connected in parallel.

[0022] The stop valve 4 is arranged at both ends of each branch of the gas flow regulating module for emergency shutdown or maintenance. When the instrument needs to be repaired, the stop valves 4 at both ends can be directly closed, and the instrument can be removed for maintenance without affecting the normal operation of the equipment.

[0023] There are n groups of pneumatic valves 7, each group controls 15% to 30% of the rated gas flow, one group of pneumatic valves 7 is for standby use, and the remaining n-1 groups are for common use.

[0024] The upper limit of gas flow regulation of regulating valve 5 is a certain percentage of the rated gas flow, which should not be too large, otherwise it will affect the control accuracy of regulating valve 5; the upper limit of the gas flow regulation module regulation is the sum of the upper limits of gas flow regulation of the commonly used pneumatic valve 7 branch and the regulating valve 5 branch, which is 120%~150% of the rated gas flow.

[0025] After the actual pressure inside the system is detected by the pressure gauge 3, the pressure gauge 3 feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC sends a signal to the pneumatic valve 7 and the regulating valve 5 according to the program design. The pneumatic valve 7 is used as the main valve and the regulating valve 5 is used as the auxiliary valve to control the gas flow, maintain the dynamic balance between the system gas output and gas discharge, and stabilize the pressure inside the system at the set value required by the user.

[0026] The pneumatic valve 7 is a pneumatic two-way ball valve, and the regulating valve 5 is a pneumatic diaphragm regulating valve 5. The pneumatic two-way ball valve is fully opened instantly with almost no delay, and the flow rate through the valve is fixed; the pneumatic diaphragm regulating valve 5 is slowly adjusted to the required valve opening to adjust the flow rate.

[0027] When the internal pressure of the gas flow regulating module is different, the actual gas flow of each branch is also different; the actual gas flow of the regulating valve 5 branch needs to be controlled according to the value of the gas flow meter 6 on the branch of the pneumatic valve 7. When designing the pipeline, the pressure drop of each branch should be kept consistent as much as possible. Example

[0028] This embodiment provides a precise and fast hydrogen production equipment hydrogen and oxygen side pressure and liquid level regulation system: It includes a gas-liquid separator, a condenser, and a gas flow control module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow control modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow control modules on the hydrogen side and the oxygen side.

[0029] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module includes a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, and a gas flow meter, wherein the pneumatic valve is a DC-H00034 pneumatic two-way ball valve, and the regulating valve is a HEABERT-R11CNT332B025 pneumatic diaphragm regulating valve.

[0030] The stop valves are set at both ends of each branch of the gas flow control module for emergency shutdown or maintenance. When the instrument needs to be repaired, the stop valves at both ends can be directly closed and the instrument can be removed for maintenance without affecting the normal operation of the equipment.

[0031] There are 6 groups of pneumatic valves, each group controls 25% of the rated gas flow, 1 group of pneumatic valves is spare, and the remaining 5 groups are commonly used.

[0032] The upper limit of the gas flow rate of the control valve is 25% of the rated gas flow rate. The upper limit of the gas flow rate control module is the sum of the upper limits of the gas flow rate control of the common pneumatic valve branch and the control valve branch, which is 150% of the rated gas flow rate.

[0033] The actual pressure inside the system detected by the pressure gauge is 1.1 MPa, which is greater than the user's set value of 1.0 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 60% of the rated gas flow rate according to the PLC program design to maintain the 1.0 MPa system pressure. The PLC sends a signal to the pneumatic valve and the regulating valve, with the pneumatic valve as the main and the regulating valve as the auxiliary, to open the two groups of pneumatic valves to share 50% of the rated gas flow, and control the valve opening of the regulating valve to make the gas flow rate of the regulating valve branch 10% of the rated gas flow rate, maintain the dynamic balance between the system gas output and gas discharge, and stabilize the pressure inside the system at the user's set value of 1.0 MPa.

[0034] Embodiment 2: This embodiment provides a precise and fast hydrogen production equipment hydrogen and oxygen side pressure and liquid level regulation system: It includes a gas-liquid separator, a condenser, and a gas flow control module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow control modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow control modules on the hydrogen side and the oxygen side.

[0035] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module includes a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, and a gas flow meter, wherein the pneumatic valve is a DC-H00029 pneumatic two-way ball valve, and the regulating valve is a HEABERT-R11CNT332B022 pneumatic diaphragm regulating valve.

[0036] The stop valves are set at both ends of each branch of the gas flow control module for emergency shutdown or maintenance. When the instrument needs to be repaired, the stop valves at both ends can be directly closed and the instrument can be removed for maintenance without affecting the normal operation of the equipment.

[0037] There are 6 groups of pneumatic valves, each group controls 20% of the rated gas flow, 1 group of pneumatic valves is spare, and the remaining 5 groups are commonly used.

[0038] The upper limit of the gas flow regulation of the control valve is 20% of the rated gas flow. The upper limit of the gas flow regulation module is the sum of the upper limits of the gas flow regulation of the common pneumatic valve branch and the control valve branch, which is 120% of the rated gas flow.

[0039] The actual pressure inside the system detected by the pressure gauge is 1.0 MPa, which is greater than the user's set value of 0.8 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 65% of the rated gas flow rate according to the PLC program design to maintain the system pressure of 0.8 MPa. The PLC sends a signal to the pneumatic valve and the regulating valve, with the pneumatic valve as the main regulating valve as the auxiliary, to open 3 groups of pneumatic valves to share 60% of the rated gas flow, and control the valve opening of the regulating valve to make the gas flow rate of the regulating valve branch 5% of the rated gas flow rate, maintain the dynamic balance between the system gas output and gas discharge, and stabilize the pressure inside the system at the user's set value of 0.8 MPa.

[0040] Embodiment 3: This embodiment provides a precise and fast hydrogen production equipment hydrogen and oxygen side pressure and liquid level regulation system: It includes a gas-liquid separator, a condenser, and a gas flow control module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow control modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow control modules on the hydrogen side and the oxygen side.

[0041] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module includes a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, and a gas flow meter, wherein the pneumatic valve is a DC-H00034 pneumatic two-way ball valve, and the regulating valve is a HEABERT-R11CNT332B027 pneumatic diaphragm regulating valve.

[0042] The stop valves are set at both ends of each branch of the gas flow control module for emergency shutdown or maintenance. When the instrument needs to be repaired, the stop valves at both ends can be directly closed and the instrument can be removed for maintenance without affecting the normal operation of the equipment.

[0043] There are 5 groups of pneumatic valves, each group controls 25% of the rated gas flow, 1 group of pneumatic valves is spare, and the other 4 groups are commonly used.

[0044] The upper limit of the gas flow rate of the control valve is 30% of the rated gas flow rate. The upper limit of the gas flow rate control module is the sum of the upper limits of the gas flow rate control of the common pneumatic valve branch and the control valve branch, which is 130% of the rated gas flow rate.

[0045] The actual pressure inside the system detected by the pressure gauge is 1.6 MPa, which is greater than the user's set value of 1.5 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 35% of the rated gas flow rate according to the PLC program design to maintain the 1.5 MPa system pressure. The PLC sends a signal to the pneumatic valve and the regulating valve, with the pneumatic valve as the main and the regulating valve as the auxiliary, to open a group of pneumatic valves to share 25% of the rated gas flow, and control the valve opening of the regulating valve to make the gas flow rate of the regulating valve branch 10% of the rated gas flow rate, maintain the dynamic balance between the system gas output and gas discharge, and stabilize the pressure inside the system at the user's set value of 1.5 MPa.

[0046] Embodiment 4: This embodiment provides a precise and fast hydrogen production equipment hydrogen and oxygen side pressure and liquid level regulation system: It includes a gas-liquid separator, a condenser, and a gas flow control module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow control modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow control modules on the hydrogen side and the oxygen side.

[0047] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module comprises a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, and a gas flow meter, wherein the pneumatic valve is an OSA-Q611 pneumatic two-way ball valve, and the regulating valve is an OSAZJH-P pneumatic diaphragm regulating valve.

[0048] The stop valves are set at both ends of each branch of the gas flow control module for emergency shutdown or maintenance. When the instrument needs to be repaired, the stop valves at both ends can be directly closed and the instrument can be removed for maintenance without affecting the normal operation of the equipment.

[0049] There are 7 groups of pneumatic valves, each group controls 20% of the rated gas flow, 1 group of pneumatic valves is spare, and the remaining 6 groups are commonly used.

[0050] The upper limit of the gas flow rate of the control valve is 20% of the rated gas flow rate. The upper limit of the gas flow rate control module is the sum of the upper limits of the gas flow rate control of the common pneumatic valve branch and the control valve branch, which is 140% of the rated gas flow rate.

[0051] The actual pressure inside the system detected by the pressure gauge is 0.7 MPa, which is greater than the user's set value of 0.5 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 80% of the rated gas flow rate according to the PLC program design to maintain the 0.5 MPa system pressure. The PLC sends a signal to the pneumatic valve and the regulating valve, with the pneumatic valve as the main regulating valve and the regulating valve as the auxiliary, to open 4 groups of pneumatic valves to share 80% of the gas flow rate. The gas flow rate of the regulating valve branch is 0% of the rated gas flow rate. No action is required to maintain the dynamic balance between the system gas output and gas discharge, so that the pressure inside the system is stable at the user's set value of 0.5 MPa.

[0052] Comparative Example 1: This comparative example uses a traditional pressure and liquid level control system with a single set of large flow diaphragm control valves: It includes a gas-liquid separator, a condenser, and a gas flow control module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow control modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow control modules on the hydrogen side and the oxygen side.

[0053] The gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipes; the gas flow regulating module comprises a pressure gauge, a regulating valve and a gas flow meter, wherein the regulating valve is a ZTZJHP-ZXP-16K pneumatic diaphragm regulating valve.

[0054] The upper limit of the gas flow rate of the regulating valve is 100% of the rated gas flow rate.

[0055] The actual pressure inside the system detected by the pressure gauge is 0.7 MPa, which is greater than the user's set value of 0.5 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 80% of the rated gas flow rate according to the PLC program design to maintain the 0.5 MPa system pressure. The PLC sends a signal to the control valve to control the valve opening of the control valve so that the gas flow rate of the control valve branch is 80% of the rated gas flow rate, maintaining the dynamic balance between the system gas output and gas discharge, so that the pressure inside the system is stable at the user's set value of 0.5 MPa.

[0056] The above embodiment is compared with the traditional adjustment method, as shown in the following table: The actual pressure inside the system detected by the pressure gauge is 0.7 MPa, which is greater than the user's set value of 0.5 MPa. The pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC needs to control the gas flow rate to 80% of the rated gas flow rate according to the PLC program design to maintain the 0.5 MPa system pressure. The PLC sends a signal to the control valve to control the valve opening of the control valve so that the gas flow rate of the control valve branch is 80% of the rated gas flow rate, maintaining the dynamic balance between the system gas output and gas discharge, so that the pressure inside the system is stable at the user's set value of 0.5 MPa.

[0057] The above embodiment is compared with the traditional adjustment method, as shown in the following table: Through the above comparison, it can be seen that after the improvement of the present invention, multiple groups of pneumatic valves are used in combination with small flow control valves. The response time of the flow change can be as short as 0.05s, the adjustable range can be increased to 150% at most, and the adjustment error accuracy can reach ±0.5%. The pressure level control system designed by the invention adopts a single control valve and multiple pneumatic valves for coordinated control, with pneumatic valves as the main control valve and auxiliary control valves. The gas flow is first quickly and roughly adjusted by the pneumatic valve, and then supplemented and accurately adjusted by the control valve. The advantage is that this design reduces the requirements of the upper and lower limits of the flow on the size of the control valve, and can use smaller and more accurate control valves for adjustment, thereby improving the control accuracy and speed.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An accurate and fast hydrogen production equipment hydrogen and oxygen side pressure and liquid level regulation system, characterized by: It comprises a gas-liquid separator, a condenser and a gas flow regulating module; hydrogen and oxygen generated by water electrolysis of the hydrogen production equipment enter the gas-liquid separator through a pipeline; the separated hydrogen and oxygen enter the gas flow regulating modules on the hydrogen side and the oxygen side respectively after passing through the condenser; the pressure and liquid level on the hydrogen side and the oxygen side are controlled by adjusting the opening of the valves of the gas flow regulating modules on the hydrogen side and the oxygen side; the gas flow regulating module is arranged on the hydrogen and oxygen exhaust pipelines; the gas flow regulating module comprises a pressure gauge, a pneumatic valve, a regulating valve, a stop valve, a gas flow meter and several branches, the pressure gauge is installed on the pipeline connecting the gas flow module and the condenser, one group of branches is installed with a regulating valve, a gas flow meter is designed to be installed on the rear side of the regulating valve on the same branch, and each of the other groups of branches is respectively installed with a pneumatic valve, a gas flow meter is designed to be installed on the rear side of the pneumatic valve on the same branch; a stop valve is respectively installed at both ends of each group of branches, and several branches are connected in parallel.

2. According to claim 1, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized by: The pneumatic valves are provided in multiple groups, each group controls a certain percentage of the rated gas flow, one group of pneumatic valves is for standby use, and the rest are for regular use.

3. According to claim 1, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized by: The upper limit of the gas flow regulation of the regulating valve is a certain percentage of the rated gas flow, which should not be too large, otherwise it will affect the control accuracy of the regulating valve; the upper limit of the regulation amount of the gas flow regulation module is the sum of the upper limits of the gas flow regulation amounts of the commonly used pneumatic valve branch and the regulating valve branch.

4. According to claim 1 or 3, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized in that: The pneumatic valves are provided in multiple groups, each group controls 15-30% of the rated gas flow, one group of pneumatic valves is for standby use, and the rest are for common use.

5. According to claim 1, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized by: After the actual pressure inside the system is detected by the pressure gauge, the pressure gauge feeds back the pressure signal to the PLC. After receiving the pressure signal, the PLC sends a signal to the pneumatic valve and the regulating valve according to the program design. The pneumatic valve is mainly used, and the regulating valve is used as an auxiliary to control the gas flow, maintain a dynamic balance between the system's gas output and gas discharge, and stabilize the pressure inside the system at the set value required by the user.

6. According to claim 1, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized by: The pneumatic valve is a pneumatic two-way ball valve, and the regulating valve is a pneumatic diaphragm regulating valve.

7. According to claim 1, a precise and rapid hydrogen and oxygen side pressure and liquid level regulation system for hydrogen production equipment is characterized by: When the internal pressure of the system is different, the actual gas flow of each branch of the gas flow regulating module is also different; the actual gas flow of the regulating valve branch needs to be controlled according to the value of the gas flow meter on the pneumatic valve branch; when designing the pipeline, the pressure drop of each branch should be kept consistent.

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