A water electrolysis hydrogen production equipment instrument gas source control system and control method

Abstract

The present invention discloses an instrument gas source control system and control method for water electrolysis hydrogen production equipment, the control system comprising a main instrument gas pipeline, a spare instrument gas pipeline, a pressure detection element, a programmable controller, a pneumatic ball valve, a limit switch, an air filter pressure reducer, a check valve, a two-position five-way solenoid valve, a ball valve and necessary pipeline fittings. The system ensures that the water electrolysis hydrogen production equipment can safely and smoothly release pressure when the instrument gas source supply is unstable through real-time monitoring of the main instrument gas pipeline pressure and switching between the main gas source and the spare gas source, thereby further reducing the probability of safety accidents and effectively avoiding the waste of the spare gas source. The system is easy to implement and improves the safety, reliability and applicability of the water electrolysis hydrogen production equipment.

Description

Technical Field

[0001] The invention relates to the field of water electrolysis hydrogen production equipment, and in particular to an instrument gas source control system and a control method for water electrolysis hydrogen production equipment. Background Art

[0002] With the development of society, carbon neutrality has become a common vision of the world. Among them, hydrogen energy, as a substitute for fossil energy, has attracted widespread attention due to its own advantages such as high calorific value and zero emissions. "Green hydrogen" is the key to help achieve the goal of carbon neutrality and is the development direction of hydrogen production in the future.

[0003] At present, water electrolysis is one of the common industrial hydrogen production methods. Water electrolysis hydrogen production equipment usually achieves automatic control and stable operation by automatically switching the pneumatic ball valve driven by instrument gas. As the driving gas source of the pneumatic ball valve actuator, the stability of the instrument gas will directly affect the safety and stability of the equipment operation. If a gas loss accident occurs in conventional hydrogen production equipment, the pneumatic ball valve will return to the initial state, the vent valve will be closed, and the hydrogen and oxygen accumulated in the system will keep the system in a high-pressure state, which poses certain safety hazards. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention provides an instrument gas source control system for water electrolysis hydrogen production equipment, which ensures that the water electrolysis hydrogen production equipment switches to the gas source when the instrument gas source is insufficient, thereby achieving safe and stable pressure relief of the hydrogen production equipment, thereby further reducing the probability of safety accidents.

[0005] The objective of the present invention is achieved through the following technical scheme: an instrument gas source control system for water electrolysis hydrogen production equipment, comprising a main instrument gas pipeline, a spare instrument gas pipeline, a pressure detection element, a programmable controller, a pneumatic ball valve, a limit switch, a first air filter pressure reducer, a second air filter pressure reducer, a first check valve, a second check valve, a two-position five-way solenoid valve, a ball valve and necessary pipeline fittings.

[0006] The main instrument gas pipeline provides the main gas source for the water electrolysis hydrogen production equipment, and the backup instrument gas pipeline provides the backup gas source for the water electrolysis hydrogen production equipment.

[0007] The pressure detection element is installed on the main instrument gas pipeline to detect the main instrument gas pipeline pressure in real time and transmit the detected pressure signal to the programmable controller.

[0008] The programmable controller is installed in the control cabinet of the hydrogen production equipment, receives the real-time signal transmitted by the pressure detection element, processes the data, and sends out command electrical signals.

[0009] The pneumatic ball valve is installed on the spare instrument air pipeline to control the on-off of the spare instrument air pipeline.

[0010] The two-position five-way solenoid valve is used to receive instructions from a programmable controller to control the on-off of the air source that drives the pneumatic ball valve actuator, thereby controlling the switch of the pneumatic ball valve.

[0011] The limit switch is connected to the valve stem and installed on the cylinder of the pneumatic ball valve to feed back the switch status of the pneumatic ball valve to the programmable controller.

[0012] The first and second check valves are installed on the instrument gas pipeline to block the backflow of the instrument gas.

[0013] The first and second air filter pressure reducers are installed on the instrument air pipeline to purify the instrument air source and reduce the pressure of the instrument air source to a pressure suitable for the instrument.

[0014] The ball valve is installed on the instrument gas main pipeline to control the on-off of the instrument gas main pipeline.

[0015] Preferably, the pressure detection element includes one or more of a pressure transmitter, a pressure switch, and an electric contact pressure gauge.

[0016] Preferably, two check valves are installed at each location on the instrument gas pipeline.

[0017] Preferably, a stop valve is installed on the pipeline of the pressure detection element, and the pressure detection element is inspected and repaired by closing the stop valve.

[0018] Preferably, the two-position five-way solenoid valve is installed on the cylinder of the pneumatic ball valve.

[0019] The method for controlling the system by using the gas source control system of the water electrolysis hydrogen production equipment described in the present invention is as follows: the pressure detection element detects the pressure of the main instrument gas pipeline in real time, and transmits the detected pressure signal to the programmable controller, the programmable controller receives the real-time signal transmitted by the pressure detection element, analyzes and processes the data, and then sends a command electrical signal to the two-position five-way solenoid valve. The two-position five-way solenoid valve controls the on-off of the gas source driving the pneumatic ball valve actuator, thereby controlling the switch of the pneumatic ball valve. The limit switch is connected to the valve stem, and the switch state of the pneumatic ball valve is fed back to the programmable controller.

[0020] When there is no abnormality, the two-position five-way solenoid valve shall not be energized, the pneumatic ball valve shall be closed, the standby instrument gas pipeline shall be disconnected, and the main instrument gas pipeline gas source shall be used as the instrument gas source to drive the pneumatic ball valve to operate, thereby realizing the automatic operation of the hydrogen production equipment. The programmable controller processes the signal transmitted by the pressure detection element in real time. If it is determined that the main gas source pressure is lower than the set interlock protection value, it will promptly issue the equipment shutdown command and alarm information, and at the same time control the two-position five-way solenoid valve to be turned on, and the standby instrument gas of the standby instrument gas pipeline drives the pneumatic ball valve to open. At this time, the standby instrument gas pipeline is open, and the standby instrument gas is used as the instrument gas source for the equipment to execute the normal shutdown procedure, realizing the safe and stable pressure relief of the hydrogen production equipment, thereby further reducing the probability of safety accidents. If the gas source pressure of the main instrument gas pipeline returns to normal, the programmable controller can command the two-position five-way solenoid valve to close, the standby instrument gas pipeline to be disconnected, and the main instrument gas to be switched to the main gas source for the equipment operation.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The present invention effectively avoids the waste of the backup gas source by switching between the main gas source and the backup gas source, and can ensure that the water electrolysis hydrogen production equipment can safely and steadily release pressure when the instrument gas source supply is unstable, thereby further reducing the probability of safety accidents. The system is easy to implement and improves the safety, reliability and applicability of the water electrolysis hydrogen production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow chart of an instrument gas source control system for a water electrolysis hydrogen production equipment according to the present invention;

[0024] Figure 2 It is a schematic diagram of the control system flow in Example 3 of the present invention.

[0025] In the figure: PT1001 is the pressure detection element; J1001 is the stop valve; H1001 is the first check valve; H1101 is the second check valve; QZ1101 is the pneumatic ball valve; YV1101 is the two-position five-way solenoid valve; PN1001 is the first air filter pressure reducer; PN1101 is the second air filter pressure reducer; Q1001 is the ball valve; QB1001 is the air source distribution board; FFK is the limit switch; DCS is the programmable controller. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, an instrument gas source control system for water electrolysis hydrogen production equipment includes a main instrument gas pipeline, a spare instrument gas pipeline, a pressure detection element PT1001, a programmable controller DCS, a pneumatic ball valve QZ1101, a limit switch FFK, a first air filter pressure reducer PN1001, a second air filter pressure reducer PN1101, a first check valve H1001, a second check valve H1101, a two-position five-way solenoid valve YV1101, a ball valve Q1001 and necessary pipeline fittings.

[0028] The main instrument gas pipeline provides the main gas source for the water electrolysis hydrogen production equipment, and the backup instrument gas pipeline provides the backup gas source for the water electrolysis hydrogen production equipment.

[0029] The pressure detection element PT1001 is installed on the main instrument gas pipeline to detect the main instrument gas pipeline pressure in real time and transmit the detected pressure signal to the programmable controller DCS.

[0030] The programmable controller DCS is installed in the control cabinet of the hydrogen production equipment, receives the real-time signal transmitted by the pressure detection element PT1001, processes the data, and sends out command electrical signals.

[0031] The pneumatic ball valve QZ1101 is installed on the spare instrument gas pipeline to control the on-off of the spare instrument gas pipeline.

[0032] The two-position five-way solenoid valve YV1101 is used to receive instructions from a programmable controller to control the on-off of the air source that drives the pneumatic ball valve QZ1101 actuator, thereby controlling the switch of the pneumatic ball valve QZ1101.

[0033] The limit switch FKFK is connected to the valve stem and installed on the cylinder of the pneumatic ball valve QZ1101 to feed back the switch status of the pneumatic ball valve QZ1101 to the programmable controller DCS.

[0034] The first check valve H1001 and the second check valve H1101 are installed on the instrument gas pipeline to block the backflow of instrument gas.

[0035] The first air filter pressure reducer PN1001 and the second air filter pressure reducer PN1101 are installed on the instrument air pipeline to purify the instrument air source and reduce the pressure of the instrument air source to a pressure suitable for the instrument.

[0036] The ball valve Q1001 is installed on the instrument gas main pipeline to control the on-off of the instrument gas main pipeline.

[0037] The method for controlling the instrument air source using the instrument air source control system provided in the technical solution of the present invention is as follows: compressed air is used as the main air source and nitrogen is used as the backup air source. The pressure detection element PT1001 is installed on the main instrument air pipeline, and the stop valve J1001 is installed on the air bleed pipeline of the pressure transmitter. When the pressure detection element PT1001 needs to be repaired, the stop valve J1001 is closed. The first check valve H1001 is installed on the main instrument air pipeline, the pneumatic ball valve QZ1101 is installed on the backup instrument air pipeline, the two-position five-way solenoid valve YV1101 and the limit switch FFK are installed on the cylinder of the pneumatic ball valve QZ1101, the second check valve H1101 is installed on the backup instrument air pipeline, the second air filter pressure reducer PN1101 is installed on the air source pipeline of the pneumatic ball valve QZ1101, and the ball valve Q1001 and the first air filter pressure reducer PN1001 are installed on the main instrument air pipeline.

[0038] When the system is under control, the pressure detection element PT1001 detects the pressure of the main instrument gas pipeline in real time and transmits the detected pressure signal to the programmable controller DCS. When there is no abnormality, the two-position five-way solenoid valve YV1101 is not energized, the pneumatic ball valve QZ1101 is closed, the standby instrument gas pipeline is disconnected, and the main instrument gas pipeline gas source is used as the instrument gas source to drive the pneumatic ball valve QZ1101 to operate, realizing the automatic operation of the hydrogen production equipment.

[0039] The programmable controller DCS processes the signal transmitted by the pressure detection element PT1001 in real time. If the gas source pressure of the main instrument gas pipeline is lower than the set interlock protection value LSP, it will promptly issue the equipment shutdown command and alarm information, and at the same time control the two-position five-way solenoid valve YV1101 to be energized and the instrument gas of the standby instrument gas pipeline drives the pneumatic ball valve QZ1101 to open. At this time, the standby instrument gas pipeline is connected, and the standby instrument gas is used as the instrument gas source for the equipment to execute the normal shutdown procedure, so as to achieve safe and stable pressure relief of the hydrogen production equipment, thereby avoiding the possibility of safety accidents. When the gas source pressure of the main instrument gas pipeline returns to normal, the programmable controller commands the two-position five-way solenoid valve YV1101 to close, the pneumatic ball valve QZ1101 to reset, the standby instrument gas pipeline is disconnected, and the main instrument gas is switched to the main gas source for equipment operation.

[0040] In some embodiments of the present invention, a pressure transmitter PT1001 is used as a pressure detection element and installed on the main instrument gas pipeline. When the system is controlled, the pressure transmitter PT1001 detects the pressure of the main instrument gas pipeline in real time, and converts the detected pressure signal into a 4mA-20mA standard electrical signal and transmits it to the programmable controller DCS. The programmable controller DCS performs real-time data processing on the signal transmitted by the pressure transmitter PT1001 and performs real-time control of the gas source system.

[0041] In some embodiments of the present invention, an electric contact pressure gauge is used as a pressure detection element PT1001 and is installed on the main instrument gas pipeline. When the system is controlled, the electric contact pressure gauge PT1001 detects the main instrument gas pipeline pressure in real time and transmits the detected switch signal to the programmable controller DCS. The programmable controller DCS performs real-time data processing on the signal transmitted by the electric contact pressure gauge PT1001 to control the gas source system.

[0042] Using electric contact pressure gauge as pressure detection element PT1001 can not only transmit switch signal to programmable controller DCS, but also read pressure value on-site. When signal transmission fails, it can provide real-time pressure monitoring for the site.

[0043] As attached Figure 2 As shown, in some embodiments of the present invention, two check valves are installed on each of the main instrument gas pipeline and the backup instrument gas pipeline to achieve a better effect of blocking the backflow of instrument gas.

[0044] The control device uses a pressure switch as the pressure detection element PT1001 installed on the main instrument gas pipeline, and the stop valve J1001 is installed on the pressure switch air pipeline. When the pressure switch PT1001 needs to be repaired, the stop valve J1001 is closed. The first check valve H1001 and the third check valve H1002 are installed on the main instrument gas pipeline, the pneumatic ball valve QZ1101 is installed on the spare instrument gas pipeline, the two-position five-way solenoid valve YV1101 and the limit switch FFK are installed on the cylinder of the pneumatic ball valve QZ1101, the second check valve H1101 and the fourth check valve H1102 are installed on the spare instrument gas pipeline, the first air filter pressure reducer PN1101 is installed on the gas source pipeline of the pneumatic ball valve QZ1101, and the ball valve Q1001 and the second air filter pressure reducer PN1001 are installed on the main instrument gas pipeline.

[0045] When controlling the system, the pressure switch PT1001 detects the main instrument gas pipeline pressure in real time and transmits the detected switch signal to the programmable controller DCS. The programmable controller DCS processes the signal transmitted by the pressure switch PT1001 in real time and controls the gas source system.

[0046] The above description is a further explanation of the present invention in combination with specific implementation methods and drawings. However, the present invention can obviously be implemented in a variety of other methods different from the description, and those skilled in the art can generalize and deduce according to actual usage without violating the content of the present invention. Therefore, the content of the above specific embodiments should not limit the protection scope determined by the present invention.

Claims

1. An instrument gas source control system for water electrolysis hydrogen production equipment, characterized in that: The control system includes: a main instrument air pipeline, a backup instrument air pipeline, a pressure detection element (PT1001), a programmable controller (DCS), a pneumatic ball valve (QZ1101), a limit switch (FFK), a first air filter pressure reducer (PN1001), a second air filter pressure reducer (PN1101), a first check valve (H1001), a second check valve (H1101), a two-position five-way solenoid valve (YV1101) and a ball valve (Q1001); The main instrument gas pipeline provides a main gas source for the water electrolysis hydrogen production equipment, and the backup instrument gas pipeline provides a backup gas source for the water electrolysis hydrogen production equipment; The pressure detection element (PT1001) is installed on the main instrument gas pipeline to detect the pressure of the main instrument gas pipeline in real time and transmit the detected pressure signal to the programmable controller (DCS); The programmable controller (DCS) is installed in the control cabinet of the hydrogen production equipment, and is used to receive the real-time signal transmitted by the pressure detection element (PT1001), perform data processing, and issue a command electrical signal; The pneumatic ball valve (QZ1101) is installed on the standby instrument gas pipeline to control the on-off of the standby instrument gas pipeline; The two-position five-way solenoid valve (YV1101) is used to receive instructions from the programmable controller (DCS), control the on / off of the air source of the pneumatic ball valve (QZ1101) actuator, and control the switch of the pneumatic ball valve (QZ1101); The limit switch (FFK) is connected to the valve stem and installed on the cylinder of the pneumatic ball valve (QZ1101), and feeds back the switch state of the pneumatic ball valve (QZ1101) to the programmable controller (DCS); The first check valve (H1001) and the second check valve (H1101) are installed on the instrument gas pipeline to block the backflow of instrument gas; The first air filter pressure reducer (PN1001) and the second air filter pressure reducer (PN1101) are installed on the instrument air pipeline to purify the instrument air source and reduce the pressure of the instrument air source to a pressure suitable for the instrument; The ball valve (Q1001) is installed on the main instrument gas pipeline to control the on-off of the main instrument gas pipeline.

2. The instrument gas source control system for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The pressure detection element (PT1001) includes one or more of a pressure transmitter, a pressure switch, and an electric contact pressure gauge.

3. The instrument gas source control system for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The check valves installed on the instrument gas pipeline are installed with two at each location.

4. The instrument gas source control system for water electrolysis hydrogen production equipment according to claim 1, characterized in that: A stop valve (J1001) is installed on the pipeline of the pressure detection element (PT1001), and the pressure detection element (PT1001) is inspected and repaired by closing the stop valve (J1001).

5. The instrument gas source control system for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The two-position five-way solenoid valve (YV1101) is installed on the cylinder of the pneumatic ball valve (QZ1101).

6. A method for controlling an instrument gas source system of a water electrolysis hydrogen production equipment, characterized in that: Using the instrument air source control system according to any one of claims 1 to 5, perform the following steps: The pressure detection element (PT1001) detects the pressure of the main instrument air pipeline in real time, and transmits the detected pressure to the programmable controller (DCS); the programmable controller (DCS) receives the real-time signal transmitted by the pressure detection element (PT1001), analyzes and processes the data, and sends a command electrical signal to the two-position five-way solenoid valve (YV1101); the two-position five-way solenoid valve (YV1101) controls the on-off of the air source of the actuator of the pneumatic ball valve (QZ1101), thereby controlling the switch of the pneumatic ball valve (QZ1101); When there is no abnormality, the two-position five-way solenoid valve (YV1101) shall not be powered, the pneumatic ball valve (QZ1101) shall be closed, the standby instrument gas pipeline shall be disconnected, and the gas source of the main instrument gas pipeline shall be used as the instrument gas source to drive the pneumatic ball valve (QZ1101) to operate, thereby realizing the automatic operation of the hydrogen production equipment; The programmable controller (DCS) processes the signal transmitted by the pressure detection element (PT1001) in real time. When it is determined that the main gas source pressure is lower than the set interlock protection value, it promptly issues an equipment shutdown command and alarm information, and at the same time controls the two-position five-way solenoid valve (YV1101) to be turned on. The backup instrument gas of the backup instrument gas pipeline drives the pneumatic ball valve (QZ1101) to open. At this time, the backup instrument gas pipeline is connected, and the backup instrument gas serves as the instrument gas source for the equipment to execute the normal shutdown procedure, thereby realizing safe and stable pressure relief of the hydrogen production equipment; when the gas source pressure of the main instrument gas pipeline returns to normal, the programmable controller (DCS) commands the two-position five-way solenoid valve (YV1101) to close, the backup instrument gas pipeline is disconnected, and the main instrument gas is switched to the main instrument gas pipeline gas source for equipment operation.

Images