Valve control method of hydrogen purification system and hydrogen purification system

Abstract

The invention relates to the technical field of hydrogen preparation, and provides a valve control method of a hydrogen purification system and the hydrogen purification system.The hydrogen purification system comprises a first purifier, a first gas inlet valve and a first gas outlet valve; and a second purifier, a second air inlet valve and a second air outlet valve. The control method comprises the following steps that when the first air inlet valve and the second air inlet valve are in a closed state, the inlet pressure of the first air inlet valve and the second air inlet valve is larger than the outlet pressure, and then the first air inlet valve and / or the second air inlet valve are / is opened; when the first air inlet valve and / or the second air inlet valve are / is in the open state, the first air inlet valve and the second air inlet valve are closed firstly, and after the inlet pressure of the first air inlet valve and the second air inlet valve is larger than the outlet pressure, the first air inlet valve and / or the second air inlet valve are / is opened. According to the valve control method of the hydrogen purification system and the hydrogen purification system, reverse conduction of the valve in work can be avoided, the service life of the valve is prolonged, and the operation stability of the system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen preparation, and in particular to a valve control method for a hydrogen purification system and a hydrogen purification system. Background Art

[0002] At present, hydrogen is being vigorously promoted as a clean and efficient energy source. There may be some harmful impurities in the production process of hydrogen, such as oxygen, water, carbon dioxide, etc. These impurities will affect the quality and efficiency of hydrogen. The role of the hydrogen purifier is to remove these impurities so that hydrogen can be used more efficiently. The hydrogen purifier is mainly composed of an adsorbent and a heater. When hydrogen enters the hydrogen purifier, it first passes through the adsorbent. The adsorbent is a special material that can adsorb impurities in hydrogen, and the pure hydrogen will be released through the hydrogen outlet pipeline. These adsorbents are usually metal oxides or molecular sieves, which can selectively adsorb impurities in hydrogen. During the activation and regeneration of the adsorbent, the hydrogen purifier heats the adsorbent to release the adsorbed impurities. These impurities will be discharged from the hydrogen purifier through the exhaust pipeline.

[0003] In the process of hydrogen purification, it is necessary to automatically open or close valve components such as solenoid valves according to external signals to control the flow of gas, achieve precise control of gas flow, pressure and flow direction, and effectively remove impurities in hydrogen. The patent CN115872360B previously applied by the applicant, a hydrogen production and purification system and its hydrogen production equipment, discloses a hydrogen purification system and the principle of alternating operation of the hydrogen purification system. In the process of implementing this application, the inventor found that the prior art has the following problems: in some working stages of the hydrogen purification system, the outlet pressure of the solenoid valve will be greater than the inlet pressure, which may cause the solenoid valve to conduct in reverse. For example, for a hydrogen purification system including two hydrogen purifiers, the two hydrogen purifiers need to be switched according to the working time. In this process, the phenomenon of the solenoid valve conducting under the action of reverse pressure may occur. However, most solenoid valves are not designed with the need for reverse operation in mind, so their internal components and sealing mechanisms are optimized for forward flow. If the solenoid valve is forced to work in reverse, the valve may not be opened or closed normally, and may even damage the valve body or seals, causing the hydrogen purifier to fail to operate normally. Therefore, a reasonable control logic is required for the solenoid valve to ensure that the solenoid valve can operate normally and guarantee its service life and system operation stability. Summary of the invention

[0004] Based on this, the present application provides a valve control method and a hydrogen purification system for a hydrogen purification system to solve the problem of reverse conduction of valves during operation in the prior art, extend the service life of the valves, and improve the operational stability of the hydrogen purification system.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows: On the one hand, an embodiment of the present application provides a valve control method for a hydrogen purification system, a valve control method for a hydrogen purification system, wherein the purification system includes a hydrogen inlet pipeline, a hydrogen outlet pipeline, an exhaust pipeline, and at least two purification units; The purification unit is connected in parallel between the hydrogen inlet pipeline and the hydrogen outlet pipeline; An air inlet valve is provided between the first opening end of any of the purification units and the hydrogen inlet pipeline, and an air outlet valve is provided on the pipeline between the outlet end of the air inlet valve and the inlet end of the exhaust pipeline; The two purification units in the purification unit for alternate operation are respectively defined as a first purification unit and a second purification unit, the air inlet valve corresponding to the first purification unit is defined as a first air inlet valve, the air outlet valve corresponding to the first purification unit is defined as a first air outlet valve, the air inlet valve corresponding to the second purification unit is defined as a second air inlet valve, and the air outlet valve corresponding to the second purification unit is defined as a second air outlet valve; A connecting pipeline is provided between the second opening ends of the two purification units for alternate operation, and a throttle valve is provided on the connecting pipeline; The valve control method comprises the following steps: When the first intake valve and the second intake valve are in a closed state, firstly make the inlet pressure of the first intake valve and the second intake valve greater than the outlet pressure, and then open the first intake valve and / or the second intake valve; When the first intake valve and / or the second intake valve are in an open state, the first intake valve and the second intake valve are closed first, so that the inlet pressure of the first intake valve and the second intake valve is greater than the outlet pressure, and then the first intake valve and / or the second intake valve are opened.

[0006] In one embodiment, the hydrogen purification system includes a shutdown and pressure relief stage during operation. In this stage, before disconnecting the hydrogen to be purified, the first air inlet valve and the second air inlet valve are first closed, and the first air outlet valve and the second air outlet valve are opened. When the inlet pressure of the first air inlet valve and the second air inlet valve is greater than the outlet pressure, the first air inlet valve and the second air inlet valve are opened.

[0007] In one embodiment, the shutdown and pressure relief stage also includes the following steps: after the first purifier and the second purifier are completely pressure-relieved, all valves are reset, the input of the hydrogen to be purified is disconnected, and the supply of hydrogen to the hydrogen purification system is stopped.

[0008] In one of the embodiments, the complete pressure relief is a state where the pressure value is equal to the atmospheric pressure.

[0009] In one embodiment, when the valves are reset, the first air inlet valve, the second air inlet valve, the first air outlet valve and the second air outlet valve are all in a closed state.

[0010] In one embodiment, the hydrogen purification system includes a stage of switching from the first purifier to the second purifier during operation. Before the switching, the first air inlet valve is opened, and the second air inlet valve, the first air outlet valve and the second air outlet valve are all closed. During the switching, the first air inlet valve is closed first, and after the inlet pressures of the first air inlet valve and the second air inlet valve are greater than the outlet pressures, the first air outlet valve is opened, and then the second air inlet valve is opened.

[0011] In one embodiment, the hydrogen purification system includes a stage of switching from the second purifier to the first purifier during operation. Before the switching, the second air inlet valve is opened, and the first air inlet valve, the first air outlet valve and the second air outlet valve are all closed. During the switching, the second air inlet valve is closed first, and after the inlet pressures of the first air inlet valve and the second air inlet valve are greater than the outlet pressures, the second air outlet valve is opened first, and then the first air inlet valve is opened.

[0012] In one embodiment, the hydrogen purification system includes a purge stage before operation, during which the first air inlet valve, the second air inlet valve, the first air outlet valve and the second air outlet valve are all in a closed state; in the purge stage, the purge gas source is first opened to keep the first air inlet valve and the second air inlet valve in a closed state, and after the inlet pressures of the first air inlet valve and the second air inlet valve reach a preset value, the first air inlet valve and the second air inlet valve are opened simultaneously.

[0013] In one of the embodiments, the hydrogen outlet pipeline of the hydrogen purification system is connected to the air inlet end of the exhaust pipeline to form an exhaust branch; In the purge stage, after the inlet pressures of the first air inlet valve and the second air inlet valve are made greater than the outlet pressures, the first air inlet valve and the second air inlet valve are opened simultaneously, so that the purge gas passes through the first purifier and the second purifier respectively, and then is discharged from the hydrogen purification system through the exhaust branch and the exhaust pipeline.

[0014] On the other hand, an embodiment of the present application provides a hydrogen purification system, wherein the hydrogen purification system uses the valve control method as described above to control the valve, and the hydrogen purification system includes a hydrogen inlet pipeline, a hydrogen outlet pipeline, an exhaust pipeline, and at least two purification units working alternately; The purification unit is connected in parallel between the hydrogen inlet pipeline and the hydrogen outlet pipeline; An air inlet valve is provided between the first opening end of any of the purification units and the hydrogen inlet pipeline, and an air outlet valve is provided on the pipeline between the outlet end of the air inlet valve and the inlet end of the exhaust pipeline; The two purification units for alternate operation are respectively defined as a first purification unit and a second purification unit, the air inlet valve corresponding to the first purification unit is defined as a first air inlet valve, the air outlet valve corresponding to the first purification unit is defined as a first air outlet valve, the air inlet valve corresponding to the second purification unit is defined as a second air inlet valve, and the air outlet valve corresponding to the second purification unit is defined as a second air outlet valve; A connecting pipeline is arranged between the second opening ends of the two purification units for alternate operation, and a throttle valve is arranged on the connecting pipeline.

[0015] The present application has at least the following beneficial effects: in the valve control method of the hydrogen purification system provided by the present application, when the valve needs to be opened during the use of the first air inlet valve and the second air inlet valve, it is first necessary to make the inlet pressure of the valve greater than the outlet pressure, and then the valve is opened, thereby avoiding the reverse conduction problem caused by the valve being acted upon by reverse pressure, effectively ensuring the stable operation of the hydrogen purification system, and at the same time, effectively extending the service life of the first air inlet valve and the second air inlet valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the hydrogen purification system according to an embodiment of the present application.

[0017] The meanings of the symbols in the accompanying drawings are as follows: 100. Hydrogen purification system; 101. Hydrogen inlet pipeline; 102. Hydrogen outlet pipeline; 103. Exhaust pipeline; 1. first purifier; 11. first opening end; 12. second opening end; 13. first air inlet valve; 14. first air outlet valve; 2. Second purifier; 21. Second air inlet valve; 22. Second air outlet valve; 3. Drain branch; 31. Drain valve; 4. Connecting pipeline; 41. Throttle valve; 5. Filter; 6. Back pressure valve. DETAILED DESCRIPTION

[0018] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0020] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] See also Figure 1The hydrogen purification system 100 of the embodiment of the present application includes a hydrogen inlet pipeline 101, a hydrogen outlet pipeline 102, an exhaust pipeline 103 and at least two purification units. The purification units are connected in parallel between the hydrogen inlet pipeline 101 and the hydrogen outlet pipeline 102. An inlet valve is provided between the first opening end 11 of any purification unit and the hydrogen inlet pipeline 101, and an outlet valve is provided on the pipeline between the outlet end of the inlet valve and the inlet end of the exhaust pipeline 103. The two purification units for alternating operation in the purification unit are defined as a first purification unit and a second purification unit, respectively, the inlet valve corresponding to the first purification unit is defined as a first inlet valve 13, the outlet valve corresponding to the first purification unit is defined as a first outlet valve 14, the inlet valve corresponding to the second purification unit is defined as a second inlet valve 21, and the outlet valve corresponding to the second purification unit is defined as a second outlet valve 22. A connecting pipeline 4 is provided between the second opening ends 12 of the two purification units for alternating operation, and a throttle valve 41 is provided on the connecting pipeline 4. For example, in some embodiments, a hydrogen purification system 100 may include only two purification units that work alternately; in other embodiments, a hydrogen purification system 100 may also include multiple purification units, and the purification units may be grouped, each group of purification units includes two purification units that work alternately, and the multiple groups of purification units may work simultaneously or at different times. The different working modes may be, for example, working alternately or sequentially, and the specific working mode may be set as needed.

[0023] Specifically, the first purification unit includes a first purifier 1, a first air inlet valve 13 connected in series to the pipeline between the hydrogen inlet pipeline 101 and the first open end 11 of the first purifier 1, and a first air outlet valve 14 connected in series to the pipeline between the outlet end of the first air inlet valve 13 and the inlet end of the exhaust pipeline 103, and the inlet end of the first air outlet valve 14 is respectively connected to the first air inlet valve 13 and the first open end 11 of the first purifier 1 through pipelines; the second purification unit includes a second purifier 2, which is connected in series to the hydrogen inlet pipeline 101 and the second purifier 2 The second inlet valve 21 is connected in series on the pipeline between the first opening end 11 of the first purifier 1 and the second outlet valve 22 is connected in series on the pipeline between the outlet end of the second inlet valve 21 and the inlet end of the exhaust pipeline 103. The inlet end of the second outlet valve 22 is connected to the second inlet valve 21 and the first opening end 11 of the second purifier 2 through the pipeline respectively; two groups of valve components (one group is the first inlet valve 13 and the first outlet valve 14, and the other group is the second inlet valve 21 and the second outlet valve 22) are connected in parallel on the pipeline between the hydrogen inlet pipeline 101 and the exhaust pipeline 103. A throttle valve 41 is provided on the connecting pipeline 4 between the second opening end 12 of the first purifier 1 and the second opening end 12 of the second purifier 2.

[0024] The first purifier 1 and the second purifier 2 are connected in parallel, the first open end 11 of the first purifier 1 is connected to the pipeline between the first inlet valve 13 and the first outlet valve 14 through a pipeline, and the first open end 11 of the second purifier 2 is connected to the pipeline between the second inlet valve 21 and the second outlet valve 22 through a pipeline. The pipelines connected in sequence between the hydrogen inlet pipeline 101, the first inlet valve 13, the first purifier 1, and the hydrogen outlet pipeline 102 form a first purification branch; the pipelines connected in sequence between the hydrogen inlet pipeline 101, the second inlet valve 21, the second purifier 2, and the hydrogen outlet pipeline 102 form a second purification branch.

[0025] The second open ends 12 of the two purifiers are connected to the hydrogen outlet pipeline 102 through a common pipeline. A back pressure valve 6 is provided on the common pipeline for back pressure control so that the hydrogen pressure in the purification system meets the requirements of hydrogen-using equipment or hydrogen storage equipment, saving compression equipment and reducing costs.

[0026] A connecting pipe 4 is connected between the two second open ends 12 of the two purifiers. A throttle valve 41 is provided on the connecting pipe 4. The connecting pipe 4 allows part of the hydrogen passing through one purifier to enter the other purifier to achieve regeneration and analysis of the purifier.

[0027] A filter 5 is provided at both ends of the first purifier 1 and at both ends of the second purifier 2, respectively. The filter 5 is used to prevent the adsorbent in the purifier from rushing into the pipeline.

[0028] The hydrogen purification system 100 of this embodiment further includes an exhaust branch 3, and the air inlet end of the hydrogen outlet pipeline 102 is connected to the air inlet end of the exhaust pipeline 103 to form an exhaust branch 3. One end of the exhaust branch 3 is connected to the pipeline in front of the exhaust pipeline 103, and the other end is connected to the pipeline at the inlet end of the back pressure valve 6. The exhaust branch 3 is provided with an exhaust valve 31, which is in a closed state when any purifier is working, and is in an open state in the purge stage and the shutdown pressure relief stage.

[0029] In this embodiment, the first air inlet valve 13, the second air inlet valve 21, the first air outlet valve 14, the second air outlet valve 22 and the exhaust valve 31 are all solenoid valves. In the initial state, that is, the reset state, except that the exhaust valve 31 is in the open state, the first air inlet valve 13, the second air inlet valve 21, the first air outlet valve 14 and the second air outlet valve 22 are all in the closed state.

[0030] In the above embodiment, the hydrogen purification system 100 includes a purification unit alternating working stage when working, specifically, the first purification unit and the second purification unit alternately work, taking the first purification unit in the adsorption working state and the second purification unit in the regeneration and desorption state as an example, switching to the first purification unit in the regeneration and desorption state and the second purification unit in the adsorption working state, the valve control method at this time is as follows: Before switching, the first air inlet valve 13 is opened, and the second air inlet valve 21, the first air outlet valve 14 and the second air outlet valve 22 are all closed; when switching, the first air inlet valve 13 is closed first, and after the inlet pressure of the first air inlet valve 13 and the second air inlet valve 21 is greater than the outlet pressure, the first air outlet valve 14 is opened first, and then the second air inlet valve 21 is opened.

[0031] Specifically, when the first purification unit is in adsorption operation, the second purification unit is in a regeneration desorption state, at this time, the first air inlet valve 13 is opened, the first air outlet valve 14 and the second air inlet valve 21 are both in a closed state, the hydrogen to be purified is purified through the first purification branch, the impurities are adsorbed in the adsorbent in the first purifier 1, and the purified hydrogen is discharged from the hydrogen purification system 100 through the hydrogen outlet pipeline 102. In addition, a back pressure valve 6 is provided between the first purification unit and the hydrogen outlet pipeline 102, so the pressure in the first purification branch is usually high pressure, and the specific pressure value can be set according to the hydrogen demand of the back end, for example, set to 3Mpa.

[0032] A connecting pipe 4 is provided between the second open end 12 of the first purifier 1 and the second open end 12 of the second purifier 2, and a throttle valve 41 is provided on the connecting pipe 4. A part of the hydrogen after passing through the first purifier 1 enters the second purifier 2 through the connecting pipe 4 to desorb the adsorbent in the second purifier 2, and the desorbed impurities are discharged from the exhaust pipe 103 along with the small amount of hydrogen through the second outlet valve 22. The first purifier 1 and the second purifier 2 are provided with a heating device. When the purifier is in a regeneration desorption state, the purifier is heated to accelerate the desorption process of the adsorbent and shorten the time required for desorption.

[0033] When the first purifier 1 switches from the adsorption working state to the regeneration desorption state, and the second purifier 2 switches from the regeneration desorption state to the adsorption working state, the pressure in the first purifier 1 is high pressure (such as 3Mpa). If the first air intake valve 13 is directly closed and the second air intake valve 21 is opened for switching, the pressure at the inlet end of the first air intake valve 13 will be lower than the pressure at the outlet end, causing hydrogen backflow, making it impossible for the first air intake valve 13 to be opened / closed normally, and even causing damage to the valve body or sealing components, thereby failing to operate normally. At this time, the valve control method of the embodiment of the present application is adopted, and the first air inlet valve 13 is closed first. At this time, the second air inlet valve 21 is also in a closed state. The hydrogen to be purified is continuously input into the hydrogen inlet pipeline 101, and the pressure at the inlet end of the first air inlet valve 13 and the second air inlet valve 21 is respectively made greater than the pressure at the outlet end. Then, the first air outlet valve 14 is opened, and the high-pressure hydrogen in the first purification unit is discharged from the hydrogen purification system 100 through the first air outlet valve 14 and the exhaust pipeline 103, thereby completing the pressure relief of the first purification unit; after the pressure of the first purification unit is relieved, the second air inlet valve 21 is opened, and the hydrogen to be purified is purified by the second purifier 2.

[0034] When the second purifier 2 switches from the adsorption working state to the regeneration desorption state, and the first purifier 1 switches from the regeneration desorption state to the adsorption working state, based on the same principle, the second air inlet valve 21 needs to be closed first, and when the pressure at the inlet end of the second air inlet valve 21 and the first air inlet valve 13 is greater than the pressure at the outlet end, the second air outlet valve 22 is opened to relieve the pressure of the second purification unit. After the pressure relief is completed, the first air inlet valve 13 is finally opened. At this time, the hydrogen to be purified is purified through the first purifier 1.

[0035] In some embodiments, the hydrogen purification system 100 needs to be purged before the hydrogen purification system 100 operates to remove impurities such as air or residual hydrogen stored in the hydrogen purification system 100, thereby improving the purity of the hydrogen.

[0036] The valve control method during the purge phase is as follows: Before the purge phase begins, all valves are in a reset state, that is, the first air inlet valve 13, the second air inlet valve 21, the first air outlet valve 14 and the second air outlet valve 22 are all closed, and only the exhaust valve 31 is open.

[0037] At the beginning of the purge stage, the pressure inside the two purifiers is close to the atmospheric pressure. At this time, the purge gas source is first opened, and the first air inlet valve 13 and the second air inlet valve 21 are kept closed. After the inlet pressures of the first air inlet valve 13 and the second air inlet valve 21 reach a preset value, the first air inlet valve 13 and the second air inlet valve 21 are opened simultaneously. This control method can prevent the first air inlet valve 13 and the second air inlet valve 21 from being unable to completely purge the two purifiers due to insufficient air inlet pressure.

[0038] Specifically, for example, pressure sensors can be respectively arranged at the corresponding positions of the first air inlet valve 13 and the second air inlet valve 21 to detect their inlet pressure and outlet pressure respectively. First, the purge gas source is opened. The gas in the purge gas source can be, for example, hydrogen to be purified. When the inlet ends of the first air inlet valve 13 and the second air inlet valve 21 reach a preset pressure, the first air inlet valve 13 and the second air inlet valve 21 can be opened at the same time to ensure that the gas with sufficient pressure can be used to purge the two purifiers thoroughly. The first air inlet valve 13 and the second air inlet valve 21 have the same priority level. After the purge gas enters the two purifiers (the first purifier 1 and the second purifier 2) respectively from the hydrogen inlet pipeline 101, it is discharged from the exhaust branch 3 and the exhaust pipeline 103. The magnitude of the inlet pressure and outlet pressure of the valve can be judged, for example, based on the pressure difference between the two. For example, a pressure difference of 2-3 bar can be set. When the pressure difference between the inlet pressure and the outlet pressure exceeds this range, the first air inlet valve 13 and the second air inlet valve 21 can be opened at the same time. Of course, the opening timing of the first intake valve 13 and the second intake valve 21 may also be determined by other methods, for example, according to the length of time the purge gas is introduced.

[0039] In some embodiments, when the hydrogen purification system 100 is in operation, including a shutdown and pressure relief phase, the valve control method at this time is as follows: Before disconnecting the input of the hydrogen to be purified, the first inlet valve 13 and the second inlet valve 21 are closed, and the first outlet valve 14 and the second outlet valve 22 are opened. When the inlet pressure of the first inlet valve 13 and the second inlet valve 21 is greater than the outlet pressure, the first inlet valve 13 and the second inlet valve 21 are opened. When the first purifier 1 and the second purifier 2 are completely depressurized, all valves are reset, and then the input of the hydrogen to be purified is disconnected, and the supply of hydrogen to the hydrogen purification system 100 is stopped.

[0040] If the input of the hydrogen to be purified is directly disconnected during shutdown and pressure relief, the existence of the back pressure valve 6 on the pipeline will cause the purification unit to be in a high pressure state, which may cause the outlet pressure of the first air inlet valve 13 and the second air inlet valve 21 to be greater than the inlet pressure, resulting in a gas reflux problem. Therefore, the control method of this embodiment first relieves the pressure of the first purifier 1 and the second purifier 2 to reduce the pressure in the purification unit, and then disconnects the input of the hydrogen to be purified.

[0041] Specifically, before disconnecting the input of the hydrogen to be purified, the first air intake valve 13 and the second air intake valve 21 are closed simultaneously (at this time, this operation can be performed regardless of the working state of the two purifiers. If one of the air intake valves is already in a closed working state, it only needs to be kept closed). When it is detected that the inlet pressure of the first air intake valve 13 and the second air intake valve 21 is greater than the outlet pressure, the first air intake valve 13 and the second air intake valve 21 can be opened simultaneously. The judgment of the opening timing of the two air intake valves is similar to the judgment of the above-mentioned purge stage, for example, it can be determined by the time when the two air intake valves are closed at the same time or according to the value of the inlet pressure of the air intake valve detected. Complete pressure relief is a state where the pressure value is equal to the atmospheric pressure. When the first air inlet valve 13 and the second air inlet valve 21 are opened at the same time, hydrogen enters the hydrogen purification system 100 from the hydrogen inlet pipeline 101, and is discharged from the exhaust pipeline 103 through the first air outlet valve 14 and the second air outlet valve 22 respectively. The residual gas in the two purifiers is discharged from the exhaust pipeline 103 along with the hydrogen flow, and finally complete pressure relief is achieved.

[0042] The valve control method and hydrogen purification system of the hydrogen purification system provided in the embodiments of the present application provide good protection for valves such as solenoid valves, effectively prevent the problem of valve damage due to gas reflux, extend the service life of the valve, reduce the occurrence rate of failures, and ensure the stable operation of the hydrogen purification system.

[0043] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A valve control method for a hydrogen purification system, characterized in that: The purification system comprises a hydrogen inlet pipeline, a hydrogen outlet pipeline, an exhaust pipeline and at least two purification units; The purification unit is connected in parallel between the hydrogen inlet pipeline and the hydrogen outlet pipeline; An air inlet valve is provided between the first opening end of any of the purification units and the hydrogen inlet pipeline, and an air outlet valve is provided on the pipeline between the outlet end of the air inlet valve and the inlet end of the exhaust pipeline; The two purification units in the purification unit for alternate operation are respectively defined as a first purification unit and a second purification unit, the air inlet valve corresponding to the first purification unit is defined as a first air inlet valve, the air outlet valve corresponding to the first purification unit is defined as a first air outlet valve, the air inlet valve corresponding to the second purification unit is defined as a second air inlet valve, and the air outlet valve corresponding to the second purification unit is defined as a second air outlet valve; A connecting pipeline is provided between the second opening ends of the two purification units for alternate operation, and a throttle valve is provided on the connecting pipeline; The valve control method comprises the following steps: When the first intake valve and the second intake valve are in a closed state, firstly make the inlet pressure of the first intake valve and the second intake valve greater than the outlet pressure, and then open the first intake valve and / or the second intake valve; When the first intake valve and / or the second intake valve are in an open state, the first intake valve and the second intake valve are closed first, so that the inlet pressure of the first intake valve and the second intake valve is greater than the outlet pressure, and then the first intake valve and / or the second intake valve are opened.

2. The valve control method of the hydrogen purification system according to claim 1, characterized in that: The hydrogen purification system includes a shutdown and pressure relief stage when in operation. In this stage, before disconnecting the hydrogen to be purified, the first air inlet valve and the second air inlet valve are first closed, and the first air outlet valve and the second air outlet valve are opened. When the inlet pressure of the first air inlet valve and the second air inlet valve is greater than the outlet pressure, the first air inlet valve and the second air inlet valve are opened.

3. The valve control method of the hydrogen purification system according to claim 2, characterized in that: The shutdown and pressure relief stage also includes the following steps: after the first purifier and the second purifier are completely pressure-relieved, all valves are reset, the input of the hydrogen to be purified is disconnected, and the supply of hydrogen to the hydrogen purification system is stopped.

4. The valve control method of the hydrogen purification system according to claim 3, characterized in that: The complete pressure relief refers to a state where the pressure value is equal to the atmospheric pressure.

5. The valve control method of the hydrogen purification system according to claim 3, characterized in that: When the valves are reset, the first air inlet valve, the second air inlet valve, the first air outlet valve and the second air outlet valve are all in a closed state.

6. The valve control method of the hydrogen purification system according to claim 1, characterized in that: The hydrogen purification system includes a stage of switching from the first purifier to the second purifier when in operation. Before the switching, the first air inlet valve is opened, and the second air inlet valve, the first air outlet valve and the second air outlet valve are all closed. When switching, the first air inlet valve is closed first, and after the inlet pressures of the first air inlet valve and the second air inlet valve are greater than the outlet pressures, the first air outlet valve is opened, and then the second air inlet valve is opened.

7. The valve control method of the hydrogen purification system according to claim 1, characterized in that: The hydrogen purification system includes a stage of switching from the second purifier to the first purifier when in operation. Before the switching, the second air inlet valve is opened, and the first air inlet valve, the first air outlet valve and the second air outlet valve are all closed. When switching, the second air inlet valve is closed first, and after the inlet pressures of the first air inlet valve and the second air inlet valve are greater than the outlet pressures, the second air outlet valve is opened first, and then the first air inlet valve is opened.

8. The valve control method of the hydrogen purification system according to claim 1, characterized in that: The hydrogen purification system includes a purge stage before operation, during which the first air inlet valve, the second air inlet valve, the first air outlet valve and the second air outlet valve are all in a closed state; in the purge stage, the purge gas source is first opened to keep the first air inlet valve and the second air inlet valve in a closed state, and after the inlet pressures of the first air inlet valve and the second air inlet valve reach a preset value, the first air inlet valve and the second air inlet valve are opened simultaneously.

9. The valve control method of the hydrogen purification system according to claim 8, characterized in that: The hydrogen outlet pipeline of the hydrogen purification system is connected to the air inlet end of the exhaust pipeline to form an exhaust branch; In the purge stage, after the inlet pressures of the first air inlet valve and the second air inlet valve are made greater than the outlet pressures, the first air inlet valve and the second air inlet valve are opened simultaneously, so that the purge gas passes through the first purifier and the second purifier respectively, and then is discharged from the hydrogen purification system through the exhaust branch and the exhaust pipeline.

10. A hydrogen purification system, characterized in that: The hydrogen purification system controls the valve using the valve control method according to any one of claims 1 to 9, and the hydrogen purification system comprises a hydrogen inlet pipeline, a hydrogen outlet pipeline, an exhaust pipeline and at least two purification units working alternately; The purification unit is connected in parallel between the hydrogen inlet pipeline and the hydrogen outlet pipeline; An air inlet valve is provided between the first opening end of any of the purification units and the hydrogen inlet pipeline, and an air outlet valve is provided on the pipeline between the outlet end of the air inlet valve and the inlet end of the exhaust pipeline; The two purification units for alternate operation are respectively defined as a first purification unit and a second purification unit, the air inlet valve corresponding to the first purification unit is defined as a first air inlet valve, the air outlet valve corresponding to the first purification unit is defined as a first air outlet valve, the air inlet valve corresponding to the second purification unit is defined as a second air inlet valve, and the air outlet valve corresponding to the second purification unit is defined as a second air outlet valve; A connecting pipeline is arranged between the second opening ends of the two purification units for alternate operation, and a throttle valve is arranged on the connecting pipeline.

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