Precious metal membrane permeation-based trace high-pressure hydrogenation system and method thereof

Abstract

The invention provides a trace high-pressure hydrogenation system based on precious metal membrane permeation, which comprises a hydrogen storage bottle, a buffer tank, a precious metal membrane permeation system, a mass flow controller, a corresponding valve pipeline and a main body structure frame, and the hydrogen storage bottle is used for storing hydrogen; an inlet of the buffer tank is communicated with an outlet pipeline of the hydrogen storage bottle through a pipeline; an inlet of the noble metal membrane permeation system is communicated with an outlet pipeline of the buffer tank through a pipeline; an inlet of the mass flow controller is communicated with an outlet pipeline of the noble metal membrane permeation system through a pipeline, and an outlet pipeline of the mass flow controller is provided with a second electromagnetic valve and a check valve; under the action of the control system, hydrogen is released from the hydrogen storage bottle and sequentially passes through various valves, the buffer tank, the noble metal membrane permeation system and the mass flow controller, and finally the hydrogen enters a user system at a certain pressure and a certain flow, so that the defects of a traditional throttling pressure reduction mode are avoided; and the influence that the instrument valve cannot be accurately controlled under high pressure is overcome.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure trace hydrogenation, and in particular to a trace high-pressure hydrogenation system based on precious metal membrane permeation and a method thereof. Background Art

[0002] For high-pressure hydrogenation equipment, it is generally used in applications with high back pressure. In the field of nuclear power, oxygen corrosion is one of the important factors affecting the safe operation and service life of nuclear power plants. Hydrogen needs to be injected into the system for deoxygenation. The system pressure can generally reach 16MPa, and the required hydrogenation rate cannot be too fast, otherwise it cannot fully deoxygenate. However, since the compressibility of gas is much greater than that of liquid, gas pressure, especially high-pressure gas pressure and rate, are difficult to control accurately.

[0003] Traditional flow control is achieved by changing the minimum cross-sectional area of ​​the flow passage in the flow control valve, thereby changing the flow resistance. In theory, changing the area of ​​the throttling passage can linearly adjust the flow. However, the flow is not only related to the throttling area. In fact, the change of the throttling area will inevitably change the pressure difference before and after the valve. This leads to the relationship between the relative opening and the relative flow rate not necessarily being nonlinear. As a result, the gas flow rate is not easy to control under high pressure or it is difficult to control the gas flow rate under high pressure. Summary of the invention

[0004] In view of the problems existing in the prior art, the present application proposes a micro-high pressure hydrogenation system based on precious metal membrane permeation, which includes a hydrogen storage bottle, a buffer tank, a precious metal membrane permeation system, a mass flow controller, corresponding valve pipelines and a main structure frame.

[0005] The hydrogen storage bottle is used to store hydrogen, and the outlet pipeline of the hydrogen storage bottle is provided with a first ball valve, a pipeline filter, a second ball valve, a first pressure reducing valve, and a first fine-tuning valve;

[0006] The inlet of the buffer tank is connected to the outlet pipeline of the hydrogen storage bottle through a pipeline, and the outlet pipeline of the buffer tank is provided with a second pressure reducing valve, a second fine-tuning valve, and a first solenoid valve;

[0007] The inlet of the noble metal membrane permeation system is connected to the outlet pipeline of the buffer tank through a pipeline;

[0008] The inlet of the mass flow controller is connected to the outlet pipeline of the noble metal membrane permeation system through a pipeline, and the outlet pipeline of the mass flow controller is provided with a second solenoid valve and a check valve;

[0009] Under the action of the control system, hydrogen is released from the hydrogen storage bottle and passes through various valves, buffer tanks, precious metal membrane permeation systems, and mass flow controllers in sequence. Finally, the hydrogen maintains a certain pressure and a certain flow rate and enters the user system.

[0010] Furthermore, the noble metal membrane permeation system includes: a noble metal membrane, a heating device, a third ball valve, a fourth ball valve, a diaphragm pump, and a third check valve. When the hydrogenation system stops running, the first solenoid valve and the second solenoid valve are closed under the control system, and then the diaphragm pump starts to work to evacuate the noble metal membrane to maintain the vacuum environment in the noble metal membrane to prevent the noble metal membrane from being contaminated; after running for a certain period of time, the fourth ball valve needs to be opened for sewage discharge.

[0011] Further, after being filtered by the pipeline filter, the hydrogen first passes through the first pressure reducing valve, and the first pressure reducing valve is adjusted under the control system according to the pressure signal of the hydrogen in the buffer tank;

[0012] When the hydrogen pressure in the buffer tank is low, the first pressure reducing valve is opened to reduce the pressure to a certain value which cannot exceed the design pressure of the buffer tank, and hydrogen is added to the buffer tank to maintain the pressure in the buffer tank stable.

[0013] Furthermore, under the control of the control system, the hydrogen in the buffer tank passes through the second pressure reducing valve and enters the precious metal membrane permeation system;

[0014] According to the hydrogen pressure and flow rate of the user, the second pressure reducing valve is controlled through calculation and control of the control system, and real-time adjustment is made according to the calculation of the control system at all times to maintain the pressure difference between the inlet and outlet of the precious metal membrane permeation hydrogenation system, thereby ensuring that hydrogen is added to the hydrogen system at a certain pressure and a certain flow rate.

[0015] Furthermore, the first pressure reducing valve is calculated according to the actual hydrogen pressure and flow rate to select a suitable CV value to prevent the CV value of the pressure reducing valve from being too large. The buffer tank is filled instantly after the pressure reducing valve is opened, resulting in excessive pressure in the buffer tank. The short filling time is not conducive to the precise control of the control system. A fine-tuning valve is set after the pressure reducing valve to further reduce the CV value, extend the filling time, and increase the operability of the control system.

[0016] Furthermore, the first pressure reducing valve performs calculations based on the actual hydrogen pressure and flow rate and selects a suitable CV value to prevent the CV value of the pressure reducing valve from being too large, thereby reducing the precise control of the control system.

[0017] Furthermore,

[0018] Alarm interlock points are set on hydrogen storage bottles and buffer tanks. When the pressure of the hydrogen storage bottle is lower than a certain pressure, continuous hydrogenation cannot be carried out, and the alarm interlock mechanism is executed to close the relevant valves. When the pressure in the buffer tank is higher or lower than the alarm interlock value, the relevant valves are executed to ensure the safety of the system.

[0019] It also includes a hydrogen detector and a hydrogen eliminator. When the hydrogen concentration in the explosion-proof room exceeds the limit value, the hydrogen detector will alarm and the hydrogen eliminator will start working to eliminate the hydrogen in the explosion-proof room and ensure the safety of the system.

[0020] Furthermore, the control system includes pneumatic mode and electric mode.

[0021] When the first ball valve, the second ball valve, the first pressure reducing valve and the second pressure reducing valve are pneumatically controlled, the control system includes an air source, a valve positioner and a control module;

[0022] When the first ball valve, the second ball valve, the first pressure reducing valve and the second pressure reducing valve are electrically controlled, the control system includes a stepping motor and a control module.

[0023] Furthermore, in the pneumatic mode, all automatically controlled pressure reducing valves and ball valves, under the action of the control system, transmit control signals to the valve positioner, and the air source controls the opening or on-off of valve groups such as the pressure reducing valve and ball valve through the valve positioner to achieve the control purpose.

[0024] Furthermore, in the electric mode, all automatically controlled pressure reducing valves and ball valves, under the action of the control system, transmit control signals to the stepper motor, and the stepper motor controls the opening or on-off of valve groups such as the pressure reducing valve and ball valve to achieve the control purpose.

[0025] The micro-amount high-pressure hydrogenation system and method based on precious metal membrane permeation provided by the present invention have the following beneficial effects compared with the prior art:

[0026] The present invention realizes a path for micro-hydrogenation under relatively high back pressure and realizes automatic and precise control, thus avoiding the drawbacks of the traditional throttling and pressure reducing method and overcoming the influence that the instrument valve cannot be precisely controlled under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The composition and arrangement block diagram of the noble metal membrane permeation hydrogenation system of the present invention;

[0028] Figure 2 This is a schematic diagram of the principle of the precious metal membrane permeation hydrogenation system of the present invention.

[0029] Serial number and name of the attached drawings: 1. Hydrogen storage bottle, 2. First ball valve, 3. Pipe filter, 4. Second ball valve, 5. 1# pressure reducing valve, 6. First fine-tuning valve, 7. Buffer tank, 8. 2# pressure reducing valve, 9. Second fine-tuning valve, 10. First solenoid valve, 11. First stop valve, 12. Precious metal membrane permeation hydrogenation system, 13. Mass flow controller, 14. Second solenoid valve, 15. Second stop valve, 16. First check valve, 17. Third fine-tuning valve, 18 , the third pressure reducing valve, 19. the third solenoid valve, 20. the hydrogen analyzer, 21. the valve drive system, 22. the vent valve, 23. the second check valve, 24. the third stop valve, 25. the first temperature transmitter, 26. the hydrogen storage tank pressure sensor, 27. the buffer tank sensor, 28. the second temperature transmitter, 29. the buffer tank pressure sensor, ①, the precious metal membrane, ②, the heating device, ③, the third ball valve, ④, the fourth ball valve, ⑤, the diaphragm pump, ⑥ the third check valve. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Reference Figure 1 and Figure 2 This application proposes a micro-high pressure hydrogenation system based on precious metal membrane permeation

[0032] The hydrogenation device mainly includes a hydrogen storage bottle 1, a buffer tank 7, a precious metal membrane permeation system 12, a mass flow controller 13 and corresponding valves, pipelines and a main structure frame. The control system is composed of a control cabinet (optional), etc. In addition, it also includes hydrogen gas detectors, hydrogen degassing devices and other hydrogenation risk control equipment.

[0033] The purpose of the hydrogen pressure reduction unit is to reduce the high-pressure hydrogen in the hydrogen storage bottle to a certain pressure, so that the hydrogen pressure reaches the controllable pressure range of the commonly used instrument valve, and then control the hydrogen pressure through the control system to ensure a certain pressure and flow rate for the hydrogen to be injected into the hydrogen device.

[0034] Embodiment 1: Pneumatic method

[0035] In the pneumatic mode, all automatically controlled pressure reducing valves and ball valves, under the action of the control system, transmit the control signal to the valve positioner. The air source controls the opening or on-off of valve groups such as pressure reducing valves and ball valves through the valve positioner to achieve the control purpose.

[0036] A pressure detection alarm device 26 and a temperature detection device 25 are respectively arranged at the outlet of the hydrogen storage bottle, a pressure detection device 27 and a temperature detection device 28 are arranged on the buffer tank, and a pressure detection device 29 is arranged before the solenoid valve 10.

[0037] The hydrogen storage bottle 1 is a carbon fiber wrapped gas cylinder with a pressure level of 35-70MPa. The buffer tank is a pressure vessel and is designed as a pressure vessel.

[0038] Hydrogen is stored in a hydrogen storage bottle 1. The hydrogen in the hydrogen storage bottle passes through a ball valve 2. The opening and closing of the ball valve 2 controls the on-off of the entire system. When the ball valve 2 is opened, the hydrogen passes through a pipeline filter 3 to filter out possible impurities therein to prevent any impact on subsequent devices.

[0039] After being filtered by the pipeline filter, the hydrogen passes through the ball valve 4 and enters the primary pressure reducing system. First, the hydrogen passes through the 1# pressure reducing valve 5. The 1# pressure reducing valve 5 is pneumatically controlled. According to the pressure signal of the hydrogen fed back by the pressure detection device 27, the 1# pressure reducing valve 5 is adjusted under the action of the control system. When the hydrogen pressure in the buffer tank is low, the 1# pressure reducing valve 5 is opened to reduce the pressure to a certain value, and hydrogen is charged into the buffer tank to maintain the pressure in the buffer tank.

[0040] The hydrogen in the buffer tank, under the control of the control system, passes through the 2# pressure reducing valve 8, the fine-tuning valve 9, and the solenoid valve 10, and then enters the precious metal membrane permeation system. The 2# pressure reducing valve is pneumatically controlled. According to the user's hydrogen pressure and flow, the opening of the 2# pressure reducing valve is controlled through the calculation and control of the control system. It is adjusted in real time according to the calculation of the control system at all times to maintain the pressure difference between the inlet and outlet of the precious metal membrane permeation system, so that the hydrogen is filled into the hydrogen system at a certain pressure and flow.

[0041] After passing through the precious metal membrane permeation system, hydrogen enters the mass flow controller 13. On the one hand, the mass flow controller can display the hydrogenation flow rate on site. On the other hand, under certain circumstances, the mass flow controller can be used as a redundant setting for the precious metal membrane permeation system. When it fails, the mass flow controller can temporarily control the flow rate to maintain the operation of the equipment.

[0042] After passing through the mass flow controller, the hydrogen enters the user system through the check valve 16. A branch is set on the pipeline before the check valve 16 to monitor the purity of hydrogenation. The branch hydrogen passes through the stop valve 17 and the pressure reducing valve 18 and enters the hydrogen analyzer 20 to detect the purity of hydrogenation in real time. When the purity of hydrogen is low and does not meet the use requirements, the interlock is shut down to stop hydrogenation.

[0043] The precious metal membrane permeation system mainly includes: precious metal membrane ①, heating device ②, ball valve ③, ball valve ④, diaphragm pump ⑤, check valve ⑥. When the hydrogenation system stops running, the solenoid valves 10 and 14 are closed under the control system, and then the diaphragm pump ⑤ starts to work to evacuate the precious metal membrane to maintain the vacuum environment inside the precious metal membrane to avoid the precious metal membrane from being contaminated. After running for a certain period of time, it is necessary to open the ball valve ④ for sewage discharge.

[0044] In the first-stage pressure reducing system, the 1# pressure reducing valve is calculated based on the actual hydrogen flow rate and the appropriate CV value is selected to prevent the CV value of the pressure reducing valve from being too large. The buffer tank will be filled instantly after the pressure reducing valve is opened, resulting in excessive pressure in the buffer tank. The short filling time is not conducive to the precise control of the control system. A fine-tuning valve is set after the pressure reducing valve to further reduce the CV value, extend the filling time, and increase the operability of the control system.

[0045] A vent valve is provided on the buffer tank 7, and venting is performed when the pressure exceeds a limit value to prevent the buffer tank from being over-pressurized.

[0046] Stop valves are respectively provided at the bypass of the solenoid valve 10 and the solenoid valve 14 to prevent the solenoid valves from being damaged, and the solenoid valves can continue to work through the stop valve 11 and the stop valve 15 respectively.

[0047] The ball valve 4 is pneumatically controlled. When the system starts to run, it opens. When a system failure alarm occurs, it closes and cuts off the overall gas path.

[0048] When the system is first operated or needs to be replaced with nitrogen after maintenance, the nitrogen is replaced through the nitrogen replacement system. The nitrogen first passes through the check valve 23, and then the stop valve 24 is opened for nitrogen replacement to ensure the safe operation of the hydrogenation device.

[0049] The main body of the hydrogenation device is arranged in an explosion-proof room, and the hydrogen detector and hydrogen remover are installed on the top of the explosion-proof room.

[0050] Embodiment 2: Electric method

[0051] In the electric mode, all automatically controlled pressure reducing valves and ball valves, under the action of the control system, transmit the control signal to the stepper motor, and the stepper motor controls the opening or on-off of valve groups such as the pressure reducing valve and ball valve to achieve the control purpose.

[0052] Control system implementation examples

[0053] The control system can be selected according to the needs. Method 1: All relevant detection instruments, control and other signals of the hydrogenation device are processed by single-chip microcomputers and other control equipment and uploaded to the user's central control cabinet for comprehensive control. Method 2: The hydrogenation device is equipped with a special control unit, which is mainly controlled by a programmable controller.

[0054] The specific control schemes of Method 1 and Method 2 are the same, and the specific control scheme of Method 1 is described below.

[0055] The control scheme mainly controls the hydrogenation flow and pressure. The system also sets over-limit alarm or interlocking functions for parameters such as pressure, temperature, flow, purity, and hydrogen concentration, realizing automatic control and safety interlocking of process engineering. For easy operation, the human-machine interaction interface uses a touch screen, which is installed on the front panel of the control cabinet to monitor the various parameters of the equipment in real time and provide alarm indications. The host computer can be set according to user needs to realize remote monitoring.

[0056] The system control software includes PLC programming software, touch screen configuration software, etc., which mainly completes functions such as operation control, fault detection, alarm interlocking and data acquisition and display.

[0057] Fully consider the safety and explosion-proof design requirements of the equipment, select reliable quality instruments and safety barriers with explosion-proof grade not lower than IIC level, form a safety explosion-proof control circuit, and monitor the pressure, temperature, flow, purity, hydrogen concentration and other parameters of the equipment in real time. Once the parameters exceed the control range, sound and light alarms will be issued, and chain shutdown will be carried out if necessary.

[0058] The control mode can be divided into manual and automatic, which can realize local control and remote control.

[0059] The control system mainly includes hydrogen storage tank pressure control, buffer tank pressure control, gas source pressure control, hydrogenation flow control, and precious metal membrane permeation system control.

[0060] (1) Hydrogen storage tank pressure control

[0061] The hydrogen pressure in the hydrogen storage tank is taken, and the pressure transmitter sends the measured pressure signal to the PLC for calculation with the set pressure. The output control signal drives the opening and closing of the pneumatic (electric) ball valve 4 and the 1# pressure reducing valve 5. When the pressure in the hydrogen storage tank drops to a certain value, the pneumatic (electric) ball valve 4 is closed, the hydrogen storage tank stops charging gas into the buffer tank, and hydrogenation is terminated. In order to ensure that the system does not shut down under abnormal conditions and cause pressure loss, the ball valve 4 is a fail-close type, and the lower limit alarm and lower-lower limit interlock are set for the hydrogen storage tank pressure. Once the pressure exceeds the limit, the corresponding alarm interlock action is executed.

[0062] (2) Buffer tank pressure control

[0063] The pressure in the buffer tank is taken, and the pressure transmitter sends the measured pressure signal to the PLC for calculation with the set pressure. The output control signal drives the opening and closing of ball valve 4 and 1# pressure reducing valve 5. When the pressure in the buffer tank drops to a certain value, open ball valve 4 and 1# pressure reducing valve 5 to flush air into the buffer tank to maintain the pressure of the buffer tank. In order to ensure that the system will not shut down in an abnormal state and cause pressure to lose control, ball valve 4 is selected as a fail-close type, and the buffer tank pressure is set with an upper limit alarm and an upper and upper limit interlock. Once the pressure exceeds the limit, the corresponding alarm interlock action is executed.

[0064] (3) Gas source pressure control

[0065] When the relevant valves are pneumatically controlled, the pressure of the air source is taken and the air source pressure is measured by the electric contact pressure gauge. At the same time, the electric contact pressure gauge is equipped with a lower limit alarm and a lower limit interlock. Once the pressure exceeds the limit, the corresponding alarm interlock action is executed.

[0066] (4) Hydrogenation flow control

[0067] The pressure after the 2# pressure reducing valve 8 is taken as the control pressure, and the pressure transmitter sends the measured pressure signal to the PLC for calculation with the set pressure. The output control signal drives the 2# pressure reducing valve 8, so that the working pressure difference of the precious metal membrane permeation system is stabilized at the set value. At this time, the pressure difference at both ends of the precious metal membrane permeation system remains constant. Since the hydrogen permeability of the precious metal membrane is only related to the pressure difference after it is manufactured, the hydrogen flow rate is obtained, and the purpose of controlling the flow rate is achieved by controlling the pressure.

[0068] A mass flow controller 13 is added after the noble metal membrane permeation system to monitor and control the hydrogenation flow rate, which can be adjusted manually and remotely.

[0069] (5) Precious metal membrane permeation system control

[0070] The control of the precious metal membrane permeation system mainly includes the precious metal membrane temperature control unit, the vacuum control unit, and the temperature control unit. The temperature sensor is set to send the measured temperature signal of the system to the PLC through the temperature transmitter to calculate with the set temperature, and the control signal is output to the intermediate relay. The intermediate relay drives the heating module to heat and maintain the working temperature of the precious metal membrane. When the hydrogenation unit is not used for a long time, the precious metal membrane permeation system should be evacuated. At this time, the pressure control sends the pressure signal in the system to the PLC and calculates with the set value by setting the pressure sensor, and the output control signal is sent to the solid-state relay. The solid-state relay drives the diaphragm pump⑤ to evacuate the precious metal membrane permeation system and maintain the vacuum atmosphere of the precious metal membrane penetration.

[0071] In summary, the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. All equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification are within the scope covered by the patent of the present invention.

Claims

1. A micro-amount high-pressure hydrogenation system based on precious metal membrane permeation, characterized in that: It consists of hydrogen storage bottles, buffer tanks, precious metal membrane permeation systems, mass flow controllers, corresponding valves, pipelines and main structural frames. The hydrogen storage bottle is used to store hydrogen, and the outlet pipeline of the hydrogen storage bottle is provided with a first ball valve, a pipeline filter, a second ball valve, a first pressure reducing valve, and a first fine-tuning valve; The inlet of the buffer tank is connected to the outlet pipeline of the hydrogen storage bottle through a pipeline, and the outlet pipeline of the buffer tank is provided with a second pressure reducing valve, a second fine-tuning valve, and a first solenoid valve; The inlet of the noble metal membrane permeation system is connected to the outlet pipeline of the buffer tank through a pipeline; The inlet of the mass flow controller is connected to the outlet pipeline of the noble metal membrane permeation system through a pipeline, and the outlet pipeline of the mass flow controller is provided with a second solenoid valve and a check valve; Under the action of the control system, hydrogen is released from the hydrogen storage bottle and passes through various valves, buffer tanks, precious metal membrane permeation systems, and mass flow controllers in sequence. Finally, the hydrogen maintains a certain pressure and a certain flow rate and enters the user system.

2. The system according to claim 1, characterized in that The precious metal membrane permeation system comprises: a precious metal membrane, a heating device, a third ball valve, a fourth ball valve, a diaphragm pump, and a third check valve. When the hydrogenation system stops running, the first solenoid valve and the second solenoid valve are closed under the control system, and then the diaphragm pump starts working to evacuate the precious metal membrane to maintain the vacuum environment in the precious metal membrane to prevent the precious metal membrane from being contaminated; after running for a certain period of time, the fourth ball valve needs to be opened for sewage discharge.

3. The system according to claim 2, characterized in that: After being filtered by the pipeline filter, the hydrogen first passes through the first pressure reducing valve. According to the pressure signal of the hydrogen in the buffer tank, the first pressure reducing valve is adjusted under the control system; When the hydrogen pressure in the buffer tank is low, the first pressure reducing valve is opened to reduce the pressure to a certain value which cannot exceed the design pressure of the buffer tank, and hydrogen is added to the buffer tank to maintain the pressure in the buffer tank stable.

4. The system according to claim 3, characterized in that: The hydrogen in the buffer tank, under the control of the control system, enters the noble metal membrane permeation system through the second pressure reducing valve; According to the hydrogen pressure and flow rate of the user, the second pressure reducing valve is controlled through calculation and control of the control system, and real-time adjustment is made according to the calculation of the control system at all times to maintain the pressure difference between the inlet and outlet of the precious metal membrane permeation hydrogenation system, thereby ensuring that hydrogen is added to the hydrogen system at a certain pressure and a certain flow rate.

5. The system according to claim 4, characterized in that: The first pressure reducing valve is calculated according to the actual hydrogen pressure and flow rate, and a suitable CV value is selected to prevent the CV value of the pressure reducing valve from being too large. The buffer tank is filled instantly after the pressure reducing valve is opened, resulting in excessive pressure in the buffer tank. The short filling time is not conducive to the precise control of the control system. A fine-tuning valve is set after the pressure reducing valve to further reduce the CV value, extend the filling time, and increase the operability of the control system.

6. The system according to claim 5, characterized in that: The first pressure reducing valve performs calculations based on the actual hydrogen pressure and flow rate and selects a suitable CV value to prevent the CV value of the pressure reducing valve from being too large, thereby reducing the precise control of the control system.

7. The system according to claim 6, characterized in that: Alarm interlock points are set on hydrogen storage bottles and buffer tanks. When the pressure of the hydrogen storage bottle is lower than a certain pressure, continuous hydrogenation cannot be carried out, and the alarm interlock mechanism is executed to close the relevant valves. When the pressure in the buffer tank is higher or lower than the alarm interlock value, the relevant valves are executed to ensure the safety of the system. It also includes a hydrogen detector and a hydrogen eliminator. When the hydrogen concentration in the explosion-proof room exceeds the limit value, the hydrogen detector will alarm and the hydrogen eliminator will start working to eliminate the hydrogen in the explosion-proof room and ensure the safety of the system.

8. The system according to any one of claims 1 to 7, characterized in that: The control system includes pneumatic mode and electric mode. When the first ball valve, the second ball valve, the first pressure reducing valve and the second pressure reducing valve are pneumatically controlled, the control system includes an air source, a valve positioner and a control module; When the first ball valve, the second ball valve, the first pressure reducing valve and the second pressure reducing valve are electrically controlled, the control system includes a stepping motor and a control module.

9. The system according to claim 8, characterized in that: In the pneumatic mode, all automatically controlled pressure reducing valves and ball valves, under the action of the control system, transmit the control signal to the valve positioner. The air source controls the opening or on-off of valve groups such as pressure reducing valves and ball valves through the valve positioner to achieve the control purpose.

10. The system according to claim 8, characterized in that: In electric mode, all The pressure reducing valve and ball valve controlled by the control system transmit the control signal to the stepper motor. The opening or on / off of valve groups such as pressure reducing valves and ball valves is controlled by a stepper motor to achieve the purpose of control.

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