Hydrogen production system and control method

Abstract

The invention belongs to the technical field of chemical hydrogen production, and discloses a hydrogen production system and a control method. The hydrogen production system comprises a hydrogen production pipeline, and the hydrogen production pipeline comprises a first hydrogen production branch and a second hydrogen production branch; the first hydrogen production branch or the second hydrogen production branch is communicated with the metering pump through a first switching valve; the two ends of the impurity removing and cleaning pipeline are arranged at the two ends of the first catalysis pipe or the second catalysis pipe respectively; when the first switching valve is communicated with the first hydrogen production branch, the impurity removal cleaning pipeline is communicated with the two ends of a second catalysis pipe on the second hydrogen production branch; and when the first switching valve is communicated with the second hydrogen production branch, the impurity removal cleaning pipeline is communicated with the two ends of the first catalysis pipe on the first hydrogen production branch. According to the hydrogen production system, the first hydrogen production branch and the second hydrogen production branch which are switched to produce hydrogen in turn are arranged, impurity removal and cleaning are carried out in turn, the hydrogen production system can stably operate for a long time, and efficient hydrogen production is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical hydrogen production, and in particular, relates to a hydrogen production system and a control method. Background Art

[0002] With the development and application of hydrogen fuel cell technology, especially in China's first "Energy Law", hydrogen energy has been included in the energy management system, and the source of hydrogen has become increasingly important. There are many hydrogen production technologies to obtain hydrogen. Sodium borohydride hydrogen production is a commonly used hydrogen production technology, which is widely used because of its high efficiency, stability, easy hydrogen production, low cost, and high purity.

[0003] Long-term stable and efficient hydrogen production is a very critical issue in the process of sodium borohydride hydrogen production technology. After the sodium borohydride hydrogen production system has been reacting for a period of time, the hydrogen production reaction rate gradually shows a slow downward trend with the accumulation of time. The longer the time, the more obvious this phenomenon is. After the experiment was stopped, the surface of some catalysts in the reactor was covered with white crystals. Through investigation and analysis, it is believed that as the hydrogen production time increases, the accumulation of white crystals (white crystals are mainly sodium metaborate hydrates and trace amounts of sodium metaborate generated by the reaction) wrapped on the surface of the catalyst gradually increases, resulting in an abnormally large decrease in the effective activity of the catalytic surface, thereby causing the hydrogen production reaction rate to gradually decrease. This greatly reduces the long-term stable hydrogen production capacity and efficient hydrogen production capacity of the hydrogen production system, and its economic efficiency is also greatly reduced.

[0004] Therefore, there is an urgent need to provide a hydrogen production system that can effectively ensure long-term stable operation of the hydrogen production system and efficient hydrogen production to solve the above problems.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art that the hydrogen production system cannot operate stably for a long time and cannot produce hydrogen efficiently for a long time. The purpose is to provide a hydrogen production system that can effectively ensure the long-term stable operation of the hydrogen production system and efficient hydrogen production.

[0007] Another object of the present invention is to provide a control method for a hydrogen production system applied to the above hydrogen production system.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a hydrogen production system, the hydrogen production system includes a raw material box and a metering pump connected to the raw material box, the raw material box contains a hydrogen production raw material mixed liquid, the hydrogen production raw material mixed liquid contains sodium borohydride, and the hydrogen production system also includes:

[0009] A hydrogen production pipeline, the hydrogen production pipeline includes a first hydrogen production branch and a second hydrogen production branch; through a first switching valve, the first hydrogen production branch and the second hydrogen production branch are connected to the discharge port of the metering pump, and the first hydrogen production branch or the second hydrogen production branch is in communication with the metering pump; a fourth switching valve is also provided on the hydrogen production pipeline, and the fourth switching valve is provided at one end of the first hydrogen production branch or the second hydrogen production branch away from the metering pump; when the first switching valve is in communication with the first hydrogen production branch, the fourth switching valve is also in communication with the first hydrogen production branch; when the first switching valve is in communication with the second hydrogen production branch, the fourth switching valve is also in communication with the second hydrogen production branch; a first catalytic tube is provided on the first hydrogen production branch, and a second catalytic tube is provided on the second hydrogen production branch;

[0010] An impurity removal and cleaning pipeline, wherein two ends of the impurity removal and cleaning pipeline are respectively arranged at two ends of the first catalytic tube or the second catalytic tube through a second switching valve and a third switching valve;

[0011] Among them, when the first switching valve is connected to the first hydrogen production branch, the impurity removal and cleaning pipeline is connected to both ends of the second catalytic tube on the second hydrogen production branch; when the first switching valve is connected to the second hydrogen production branch, the impurity removal and cleaning pipeline is connected to both ends of the first catalytic tube on the first hydrogen production branch.

[0012] According to one embodiment of the present invention, the hydrogen production pipeline further comprises: a gas-liquid separator, a radiator, a water-gas separator, a hydrogen flow meter and a first solenoid valve which are connected in sequence;

[0013] The gas-liquid separator includes a through port provided on a shell thereof, and the through port of the gas-liquid separator is communicated with an external discharge port of the fourth switching valve.

[0014] According to one embodiment of the present invention, the gas-liquid separator further comprises a liquid discharge port provided on its shell, and the liquid discharge port of the gas-liquid separator is connected to the external air of the system through a second solenoid valve;

[0015] The water-gas separator comprises a drain port; the drain port of the water-gas separator is directly connected to the outside of the system, or is connected to the outside of the system through a third solenoid valve;

[0016] The gas-liquid separator is also provided with a liquid level meter;

[0017] The opening of the gas-liquid separator is also connected to an external discharge pipeline;

[0018] The external exhaust pipeline includes: a pressure sensor, a fourth solenoid valve and a flame arrester arranged on the external exhaust pipeline;

[0019] One end of the flame arrester away from the fourth solenoid valve is connected to the outside atmosphere;

[0020] The gas-liquid separator also includes a pressure relief port arranged on its shell, and the pressure relief port of the gas-liquid separator is connected to a pressure relief pipeline;

[0021] A mechanical safety pressure relief valve is provided on the pressure relief pipeline;

[0022] One end of the pressure relief pipeline away from the pressure relief port is connected to a side of the flame arrester away from the outside atmosphere.

[0023] According to one embodiment of the present invention, the impurity removal and cleaning pipeline includes:

[0024] An impurity removal box, wherein the impurity removal liquid is stored in the impurity removal box, and the impurity removal liquid is acetic acid or phosphoric acid solution; the impurity removal box has a liquid outlet and a liquid return port; the impurity removal liquid passes through the liquid outlet of the impurity removal box, removes impurities in the first hydrogen production branch or the second hydrogen production branch, and then flows back to the impurity removal box through the liquid return port of the impurity removal box;

[0025] A water storage tank, wherein cleaning water is stored in the water storage tank, and the water storage tank is not connected to the impurity removal tank; the water storage tank has a liquid outlet; the cleaning water passes through the liquid outlet of the water storage tank, cleans the first hydrogen production branch or the second hydrogen production branch, and is then discharged to the outside of the system; the water storage tank or the impurity removal tank is connected to the second switching valve via a fifth switching valve;

[0026] A first water pump, wherein the first water pump is arranged on a pipeline between the fifth switching valve and the second switching valve.

[0027] According to an embodiment of the present invention, the hydrogen production system further comprises a temperature sensor for detecting the temperature of the impurity removal liquid.

[0028] According to one embodiment of the present invention, the hydrogen production system further comprises a sixth switching valve, one end of the sixth switching valve is connected to an end of the third switching valve away from the first switching valve;

[0029] The sixth switching valve connects the liquid outlet of the impurity removal tank with the liquid return port of the impurity removal tank, or the sixth switching valve connects the liquid outlet of the water storage tank with the outside of the system.

[0030] According to one embodiment of the present invention, the hydrogen production system further comprises a circulation pipeline, and the circulation pipeline is arranged around the outer circumference of the impurity removal box and the outer circumference of the gas-liquid separator;

[0031] The water storage tank also has a first circulating liquid port and a second circulating liquid port, the first circulating liquid port is connected to one end of the circulating pipeline, and the second circulating liquid port is connected to the other end of the circulating pipeline;

[0032] A second water pump is arranged on the circulation pipeline.

[0033] The present application also provides a control method for a hydrogen production system applied to the above hydrogen production system, the control method comprising:

[0034] If it is detected that the hydrogen production condition of the first hydrogen production branch decreases by % or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control is switched to the second hydrogen production branch to perform the hydrogen production process, and the first hydrogen production branch is controlled to perform the impurity removal process and the cleaning process;

[0035] If it is detected that the hydrogen production condition of the second hydrogen production branch decreases by % or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control is switched to the first hydrogen production branch to perform the hydrogen production process, and the second hydrogen production branch is controlled to perform the impurity removal process and the cleaning process.

[0036] According to one embodiment of the present invention, the control method further comprises:

[0037] If it is detected that the temperature of the impurity removal liquid is lower than or equal to the preset minimum temperature standard, the second water pump is controlled to start;

[0038] If it is detected that the temperature of the impurity removal liquid is higher than or equal to a preset maximum temperature standard, the second water pump is controlled to stop running.

[0039] According to one embodiment of the present invention, the control method further comprises:

[0040] If it is detected that the liquid level of the liquid accumulated in the gas-liquid separator reaches a predetermined liquid level standard, the second solenoid valve is controlled to open.

[0041] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0042] 1) In the present invention, by providing the first hydrogen production branch and the second hydrogen production branch, the two hydrogen production branches are switched to produce hydrogen in turn, and impurity removal and cleaning are performed in turn, so that the hydrogen production system can operate stably for a long time and achieve efficient hydrogen production;

[0043] 2) In the present invention, under the action of the second water pump, the circulation pipeline performs heat exchange at the periphery of the gas-liquid separator, and after the temperature is increased, heat exchange is performed with the outer shell of the impurity removal box, which not only reduces the temperature difference inside the gas-liquid separator, reduces the working intensity of the subsequent radiator, and improves the gas-liquid separation efficiency, but also effectively increases the temperature of the impurity removal liquid in the impurity removal box, thereby improving its impurity removal effect on the catalytic tubes (the first catalytic tube and the second catalytic tube).

[0044] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0046] Figure 1 It is a schematic diagram of the structure and pipeline flow direction of the hydrogen production system in an embodiment of the present invention when the first hydrogen production branch is in the hydrogen production process and the second hydrogen production branch is in the impurity removal process;

[0047] Figure 2 It is a schematic diagram of the structure and pipeline flow direction when the first hydrogen production branch in the hydrogen production system in an embodiment of the present invention is in the hydrogen production process and the second hydrogen production branch is in the cleaning process;

[0048] Figure 3 It is a schematic diagram of the structure and pipeline flow direction when the first hydrogen production branch in the hydrogen production system in an embodiment of the present invention is in the impurity removal process and the second hydrogen production branch is in the hydrogen production process;

[0049] Figure 4 It is a schematic diagram of the structure and pipeline flow direction when the first hydrogen production branch in the hydrogen production system in an embodiment of the present invention is in a cleaning process and the second hydrogen production branch is in a hydrogen production process;

[0050] Figure 5 A schematic diagram of the structure and pipeline flow direction of a circulation pipeline in a hydrogen production system in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of another hydrogen production system in an embodiment of the present invention;

[0052] Figure 7 Schematic diagram of the structure of the monitoring and control components in an embodiment of the present invention.

[0053] Description of the main components in the figure:

[0054] 1. Raw material box; 2. Metering pump; 3. First switching valve; 4. First catalytic tube; 5. Second catalytic tube; 6. Second switching valve; 7. Third switching valve; 8. Fourth switching valve; 9. Gas-liquid separator; 10. Radiator; 11. Water-gas separator; 12. Hydrogen flow meter; 13. First solenoid valve; 14. Second solenoid valve; 15. Third solenoid valve; 16. Liquid level gauge; 17. Pressure sensor; 18. Fourth solenoid valve; 19. Flame arrester; 20. Mechanical safety pressure relief valve; 21. De-impurity box; 22. Water storage tank; 23. First water pump; 24. Fifth switching valve; 25. Sixth switching valve; 26. Circulation pipeline; 27. Second water pump; 28. Temperature sensor; 29. ​​Monitoring and control components; 30. Information receiving and sending unit; 31. Information processing unit; 32. Display unit; 33. Warning unit.

[0055] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0057] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0058] In the description of the present invention, 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] like Figures 1 to 7 As shown, a hydrogen production system according to the present invention comprises a raw material box 1 and a metering pump 2 connected to the raw material box 1, wherein the raw material box 1 contains a hydrogen production raw material mixed liquid; the hydrogen production raw material mixed liquid contains sodium borohydride and (a very small amount of) sodium hydroxide;

[0060] The hydrogen production system further comprises:

[0061] A hydrogen production pipeline, the hydrogen production pipeline includes a first hydrogen production branch and a second hydrogen production branch; the metering pump 2 injects the hydrogen production raw material mixed liquid in the raw material box 1 into the first hydrogen production branch and the second hydrogen production branch of the hydrogen production pipeline; through the first switching valve 3, the first hydrogen production branch and the second hydrogen production branch are connected to the discharge port of the metering pump 2, and the first hydrogen production branch or the second hydrogen production branch is connected to the metering pump 2; a first catalytic tube 4 is provided on the first hydrogen production branch, and a second catalytic tube 5 is provided on the second hydrogen production branch; a catalyst is contained in both the first catalytic tube 4 and the second catalytic tube 5; the catalyst used in the reaction can be a precious metal catalyst (such as a platinum-based catalyst, a ruthenium-based catalyst, etc.), or a non-precious metal catalyst (such as a nickel-based catalyst, a cobalt-based catalyst, etc.), and the type of the catalyst is not specifically limited here;

[0062] An impurity removal and cleaning pipeline, the two ends of which are respectively connected through a second switching valve 6 and a third switching valve 7, and are arranged at the two ends of the first catalytic tube 4 or the second catalytic tube 5;

[0063] Among them, when the first switching valve 3 is connected to the first hydrogen production branch, the impurity removal and cleaning pipeline (through the second switching valve 6 and the third switching valve 7) is connected to the two ends of the second catalytic tube 5 on the second hydrogen production branch; when the first switching valve 3 is connected to the second hydrogen production branch, the impurity removal and cleaning pipeline (through the second switching valve 6 and the third switching valve 7) is connected to the two ends of the first catalytic tube 4 on the first hydrogen production branch.

[0064] In the present invention, the hydrogen production system is provided with the first hydrogen production branch and the second hydrogen production branch, and the two hydrogen production branches are switched to produce hydrogen in turn and are removed and cleaned in turn, so that the hydrogen production system can operate stably for a long time and realize efficient hydrogen production.

[0065] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, one end of the first hydrogen production branch or the second hydrogen production branch away from the metering pump 2 is connected to the fourth switching valve 8; when the first switching valve 3 is connected to the first hydrogen production branch, the fourth switching valve 8 is also connected to the first hydrogen production branch; when the first switching valve 3 is connected to the second hydrogen production branch, the fourth switching valve 8 is also connected to the second hydrogen production branch;

[0066] The hydrogen production pipeline further includes: a gas-liquid separator 9, a radiator 10, a water-gas separator 11, a hydrogen flowmeter 12 and a first solenoid valve 13 which are connected in sequence; it can be understood that in the connection sequence of the above components, the hydrogen flowmeter 12 can also be arranged at the rear end of the first solenoid valve 13 (the end of the first solenoid valve 13 away from the water-gas separator 11);

[0067] The gas-liquid separator 9 includes a through port provided on its outer shell, and the through port of the gas-liquid separator 9 is communicated with an external discharge port of the fourth switching valve 8 .

[0068] Please see attached Figure 6 Compared with the above-mentioned implementation, in another specific implementation of this embodiment, the hydrogen production pipeline does not include the hydrogen flowmeter 12: the standard for switching the hydrogen production branch in this implementation is only based on a fixed hydrogen production cycle (the definition of the hydrogen production cycle is described in detail below).

[0069] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the gas-liquid separator 9 also includes a drain port arranged on its shell and connected to the interior thereof, and the drain port of the gas-liquid separator 9 is connected to the outside of the system through a second solenoid valve 14.

[0070] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the water-gas separator 11 includes a drain port;

[0071] (Please refer to the attached Figure 6 ) The drain outlet of the water-gas separator 11 is directly connected to the outside of the system (the third solenoid valve 15 having a cut-off function is not provided), or (please refer to the attached Figure 1 To Attachment Figure 5 ) is connected to the outside of the system through the third solenoid valve 15.

[0072] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, a liquid level meter 16 is further provided on the gas-liquid separator 9, and the liquid level meter 16 is used to detect the liquid level height of the accumulated liquid in the gas-liquid separator 9;

[0073] When it is detected that the liquid level accumulated in the gas-liquid separator 9 reaches a predetermined liquid level standard, the second solenoid valve 14 connected to the liquid discharge port of the gas-liquid separator 9 is opened to discharge the liquid;

[0074] When the liquid level in the gas-liquid separator 9 after drainage is lower than a certain liquid level height (for example, 1 cm) or the second solenoid valve 14 is opened for drainage for a period of time (for example, 2 minutes), the second solenoid valve 14 is controlled to be closed.

[0075] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the opening of the gas-liquid separator 9 is also connected to the external exhaust pipeline;

[0076] The external exhaust pipeline includes: a pressure sensor 17, a fourth solenoid valve 18 and a flame arrester 19 arranged on the external exhaust pipeline;

[0077] One end of the flame arrester 19 away from the fourth solenoid valve 18 is in communication with the outside atmosphere.

[0078] In the present invention, by providing the external discharge pipeline, the hydrogen produced in the overpressure state is discharged to ensure the normal operation of subsequent equipment components.

[0079] In a specific implementation of this embodiment, a branch pipeline is provided on the external exhaust pipeline, the branch pipeline is communicated with the external exhaust pipeline, and the pressure sensor 17 is provided on the branch pipeline.

[0080] In a specific implementation of this embodiment, the branch pipeline where the pressure sensor 17 is located is arranged on the external exhaust pipeline between the gas-liquid separator 9 and the fourth solenoid valve 18 .

[0081] In a specific implementation of this embodiment, the pressure sensor 17 is used to detect the working pressure of the catalytic tubes (the first catalytic tube 4 and the second catalytic tube 5) for producing hydrogen;

[0082] When the actual working pressure is greater than (or equal to) the preset maximum working pressure value, the metering pump 2 is controlled to stop running, and the fourth solenoid valve 18 is opened (to relieve pressure);

[0083] When the actual working pressure is less than (or equal to) the preset minimum working pressure value, the fourth solenoid valve 18 is controlled to be closed, and the metering pump 2 is controlled to be opened.

[0084] In a specific implementation of this embodiment, the opening pressure of the fourth solenoid valve 18 is 5 bar (the fourth solenoid valve 18 is controlled to be opened at this pressure), and the closing pressure of the fourth solenoid valve 18 is 1.5 bar (the fourth solenoid valve 18 is controlled to be closed at this pressure).

[0085] Please see attached Figure 1 To Attachment Figure 6In a specific implementation of this embodiment, the gas-liquid separator 9 further includes a pressure relief port disposed on its shell and connected to the interior thereof, and a pressure relief pipeline is connected to the pressure relief port of the gas-liquid separator 9;

[0086] A mechanical safety pressure relief valve 20 is provided on the pressure relief pipeline, and the mechanical safety pressure relief valve 20 is a normally closed pressure relief solenoid valve;

[0087] The mechanical safety pressure relief valve 20 may be a spring type, a lever type, a heavy hammer type, etc., and its structure is not specifically limited here;

[0088] One end of the pressure relief pipeline away from the pressure relief port is connected to a side of the flame arrester 19 away from the outside atmosphere.

[0089] In the present invention, by providing the mechanical safety pressure relief valve 20, the system is provided with secondary protection, thereby eliminating the potential risk caused by excessive pressure in the pipeline of the system due to abnormal failure of the fourth solenoid valve 18, and the reliability and safety of the hydrogen production system are higher.

[0090] In a specific implementation of this embodiment, the opening pressure range of the mechanical safety pressure relief valve 20 is 2 bar-6 bar;

[0091] When the actual working pressure is greater than (or equal to) the preset maximum working pressure value (2 bar-6 bar), the metering pump 2 is controlled to stop running, and the mechanical safety pressure relief valve 20 is opened.

[0092] In a specific implementation of this embodiment, when the pressure detected by the pressure sensor 17 exceeds 2 bar, the fourth solenoid valve 18 is controlled to open and the metering pump 2 is controlled to stop working; when the pressure is lower than 1.8 bar, the fourth solenoid valve 18 is closed, and the metering pump 2 starts working;

[0093] The opening pressure of the mechanical safety pressure relief valve 20 is 3 bar. When the pressure exceeds 3 bar, the mechanical safety pressure relief valve 20 opens.

[0094] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the impurity removal and cleaning pipeline includes:

[0095] An impurity removal tank 21, wherein the impurity removal liquid is stored in the impurity removal tank 21; the impurity removal tank 21 has a liquid outlet and a liquid return port; the impurity removal liquid passes through the liquid outlet of the impurity removal tank 21, removes impurities from the first hydrogen production branch or the second hydrogen production branch, and then flows back to the impurity removal tank 21 through the liquid return port of the impurity removal tank 21;

[0096] A water storage tank 22, wherein cleaning water is stored in the water storage tank 22, and the water storage tank 22 is not connected to the impurity removal tank 21; the water storage tank 22 has a liquid outlet; the cleaning water passes through the liquid outlet of the water storage tank 22, cleans the first hydrogen production branch or the second hydrogen production branch, and is then discharged to the outside of the system; the water storage tank 22 or the impurity removal tank 21 is connected to the second switching valve 6 through a fifth switching valve 24;

[0097] The first water pump 23 is arranged on the pipeline between the fifth switching valve 24 and the second switching valve 6; the first water pump 23 is used to pump the impurity removal liquid or cleaning water into the first catalytic tube 4 (or the second catalytic tube 5).

[0098] In a specific implementation of this embodiment, the impurity removal box 21 and / or the pipeline connected to the impurity removal box 21 are provided with an openable and closable opening (not shown in the figure) for adding or replacing the impurity removal liquid in the impurity removal box 21;

[0099] The water tank 22 and / or the pipeline connected to the water tank 22 are provided with an openable and closable opening (not shown in the figure) for adding or replacing cleaning water in the water tank 22.

[0100] In a specific implementation of this embodiment, the impurity removal liquid is acetic acid or phosphoric acid solution;

[0101] The cleaning water is purified water or distilled water.

[0102] In a specific implementation of this embodiment, the molar concentration of the impurity removal liquid is in the range of 0.5-6 mol / L.

[0103] In a specific implementation of this embodiment, the impurity removal liquid is an acetic acid solution, and its molar concentration is 3 mol / L.

[0104] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the hydrogen production system further includes a sixth switching valve 25, one end of the sixth switching valve 25 is connected to an end of the third switching valve 7 away from the first switching valve 3;

[0105] The other end of the sixth switching valve 25 is connected to the liquid return port of the impurity removal tank 21 (the sixth switching valve 25 connects the liquid outlet of the impurity removal tank 21 with the liquid return port of the impurity removal tank 21), or the other end of the sixth switching valve 25 is connected to the outside of the system (the sixth switching valve 25 connects the liquid outlet of the water storage tank 22 with the outside of the system).

[0106] Please see attached Figure 5In a specific implementation of this embodiment, the hydrogen production system further includes a circulation pipeline 26, and the circulation pipeline 26 (one end close to the first circulation liquid port) is wound around the outer periphery of the impurity removal box 21 and (one end close to the second circulation liquid port) is wound around the outer periphery of the gas-liquid separator 9;

[0107] The water storage tank 22 also has a first circulating liquid port and a second circulating liquid port, wherein the first circulating liquid port is connected to one end of the circulating pipeline 26, and the second circulating liquid port is connected to the other end of the circulating pipeline 26;

[0108] The circulation pipeline 26 is provided with a second water pump 27 , and the second water pump 27 drives the cleaning water in the water storage tank 22 to circulate in the circulation pipeline 26 .

[0109] In the present invention, under the action of the second water pump 27, the circulation pipeline performs heat exchange at the periphery of the gas-liquid separator 9 (absorbing the waste heat of the gas-liquid separator 9), and after the temperature is increased, heat exchange is performed with the outer shell of the impurity removal box 21, which not only reduces the internal temperature difference of the gas-liquid separator 9, reduces the working intensity of the subsequent radiator 10, and improves the gas-liquid separation efficiency, but also effectively increases the temperature of the impurity removal liquid in the impurity removal box 21, and improves its impurity removal effect on the catalytic tubes (the first catalytic tube 4 and the second catalytic tube 5); the cleaning water that has undergone heat exchange returns to the water storage tank 22, realizing the recycling and multifunctional utilization of water resources.

[0110] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, a temperature sensor 28 is provided on the outer shell of the impurity removal box 21 or in the box body of the impurity removal box 21, and the temperature sensor 28 is used to detect the temperature of the impurity removal liquid in the impurity removal box 21;

[0111] When it is detected that the temperature of the impurity removal liquid is lower than (or equal to) a preset minimum temperature standard (for example, 5°C, which can also be set to other temperature standards as needed), the second water pump 27 is started to heat the impurity removal liquid using the waste heat of the gas-liquid separator 9; when it is detected that the temperature of the impurity removal liquid is higher than (or equal to) a preset maximum temperature standard (for example, 20°C, which can also be set to other temperature standards as needed) after heating, the second water pump 27 is controlled to stop;

[0112] The impurity removal liquid is controlled within a temperature range that is most conducive to removing impurities from the catalytic tubes (the first catalytic tube 4 and the second catalytic tube 5 ) to ensure the reliability of the impurity removal.

[0113] Please see attached Figure 1 To Attachment Figure 6In a specific implementation of the present embodiment, the first switching valve 3, the second switching valve 6, the third switching valve 7, the fourth switching valve 8, the fifth switching valve 24 and the sixth switching valve 25 are all two-position three-way valves.

[0114] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the first switching valve 3 includes an inlet P, an outlet A and an outlet B;

[0115] When the first hydrogen production branch is performing a hydrogen production process, the inlet P of the first switching valve 3 is connected to its outlet A (the outlet B is cut off);

[0116] When the second hydrogen production branch is performing a hydrogen production process, the inlet P of the first switching valve 3 is connected to the outlet B thereof (the outlet A is blocked).

[0117] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the second switching valve 6 includes an inlet P, an outlet E and an outlet F;

[0118] When the first hydrogen production branch is cleaned or removed, the inlet P of the second switching valve 6 is connected to the outlet F thereof (the outlet E is cut off);

[0119] When the second hydrogen production branch is cleaned or rinsed, the inlet P of the second switching valve 6 is connected to the outlet E thereof (the outlet F is blocked).

[0120] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the third switching valve 7 includes an inlet G, an inlet H and an outlet P;

[0121] When the first hydrogen production branch is cleaned or cleaned, the inlet H of the third switching valve 7 is connected to its outlet P (the inlet G is cut off);

[0122] When the second hydrogen production branch is cleaned or rinsed, the inlet G of the third switching valve 7 is connected to the outlet P thereof (the inlet H is cut off).

[0123] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the fourth switching valve 8 includes an inlet C, an inlet D and an outlet P;

[0124] When the first hydrogen production branch is performing a hydrogen production process, the inlet D of the fourth switching valve 8 is connected to its outlet P (the inlet C is cut off);

[0125] When the second hydrogen production branch is performing a hydrogen production process, the inlet C of the fourth switching valve 8 is connected to the outlet P thereof (the inlet D is blocked).

[0126] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the fifth switching valve 24 includes an inlet L, an inlet K and an outlet P;

[0127] When the impurity removal process is performed on the first hydrogen production branch or the second hydrogen production branch, the inlet L of the fifth switching valve 24 is connected to the outlet P thereof (the inlet K is cut off);

[0128] When the cleaning process is performed on the first hydrogen production branch or the second hydrogen production branch, the inlet K of the fifth switching valve 24 is connected to the outlet P thereof (the inlet L is blocked).

[0129] Please see attached Figure 1 To Attachment Figure 6 In a specific implementation of this embodiment, the sixth switching valve 25 includes an inlet P, an outlet I and an outlet J;

[0130] When the impurity removal process is performed on the first hydrogen production branch or the second hydrogen production branch, the inlet P of the sixth switching valve 25 is connected to the outlet I thereof (the outlet J is cut off);

[0131] When the cleaning process is performed on the first hydrogen production branch or the second hydrogen production branch, the inlet P of the sixth switching valve 25 is connected to the outlet J thereof (the outlet I is blocked).

[0132] In a specific implementation of this embodiment, the first hydrogen production branch and the second hydrogen production branch perform the hydrogen production process in turn;

[0133] When the first hydrogen production branch is performing a hydrogen production process, the second hydrogen production branch that was previously performing a hydrogen production process is subjected to an impurity removal process and a cleaning process, and the second hydrogen production branch that has completed the impurity removal and cleaning processes is in a cut-off state;

[0134] When the second hydrogen production branch is performing the hydrogen production process, the first hydrogen production branch that was previously performing the hydrogen production process is subjected to the impurity removal process and the cleaning process. After the impurity removal and cleaning processes, the first hydrogen production branch is in a cut-off state.

[0135] Please see attached Figure 1 In a specific embodiment of the present application, when the first hydrogen production branch is in the hydrogen production process and the second hydrogen production branch is in the impurity removal process,

[0136] The inlet P of the first switching valve 3 is connected to its outlet A, the inlet P of the second switching valve 6 is connected to its outlet E, the inlet G of the third switching valve 7 is connected to its outlet P, the inlet D of the fourth switching valve 8 is connected to its outlet P, the inlet L of the fifth switching valve 24 is connected to its outlet P, and the inlet P of the sixth switching valve 25 is connected to its outlet I.

[0137] Please see attached Figure 2 In a specific embodiment of the present application, when the first hydrogen production branch is in the hydrogen production process and the second hydrogen production branch is in the cleaning process,

[0138] The inlet P of the first switching valve 3 is connected to its outlet A, the inlet P of the second switching valve 6 is connected to its outlet E, the inlet G of the third switching valve 7 is connected to its outlet P, the inlet D of the fourth switching valve 8 is connected to its outlet P, the inlet K of the fifth switching valve 24 is connected to its outlet P, and the inlet P of the sixth switching valve 25 is connected to its outlet J.

[0139] Please see attached Figure 3 In a specific embodiment of the present application, when the first hydrogen production branch is in the impurity removal process and the second hydrogen production branch is in the hydrogen production process,

[0140] The inlet P of the first switching valve 3 is connected to its outlet B, the inlet P of the second switching valve 6 is connected to its outlet F, the inlet H of the third switching valve 7 is connected to its outlet P, the inlet C of the fourth switching valve 8 is connected to its outlet P, the inlet L of the fifth switching valve 24 is connected to its outlet P, and the inlet P of the sixth switching valve 25 is connected to its outlet I.

[0141] Please see attached Figure 4 In a specific embodiment of the present application, when the first hydrogen production branch is in the cleaning process and the second hydrogen production branch is in the hydrogen production process,

[0142] The inlet P of the first switching valve 3 is connected to its outlet B, the inlet P of the second switching valve 6 is connected to its outlet F, the inlet H of the third switching valve 7 is connected to its outlet P, the inlet C of the fourth switching valve 8 is connected to its outlet P, the inlet K of the fifth switching valve 24 is connected to its outlet P, and the inlet P of the sixth switching valve 25 is connected to its outlet J.

[0143] In a specific embodiment of the present application, the first hydrogen production branch and the second hydrogen production branch switch to produce hydrogen in turn;

[0144] When the first catalytic branch carries out the hydrogen production process, the hydrogen production raw material mixture in the raw material box 1 is pumped into the first catalytic tube 4 under the drive of the metering pump 2, the first switching valve 3 and the fourth switching valve 8 are switched to the state of corresponding communication with the first catalytic branch (the first switching valve 3 is switched to the outlet A, and the fourth switching valve 8 is switched to the inlet D), and the first solenoid valve 13 is opened; the second solenoid valve 14, the third solenoid valve 15 and the fourth solenoid valve 18 are in the closed state when the hydrogen production starts; the hydrogen generated by the first catalytic tube 4 passes through the fourth switching valve 8, the gas-liquid separator 9, the radiator 10, the water-gas separator 11, the hydrogen flowmeter 12 and the first solenoid valve 13 in sequence, and is discharged from the system through the hydrogen outlet of the first solenoid valve 13.

[0145] In a specific embodiment of the present application, when the first hydrogen production branch performs a hydrogen production process (the first hydrogen production branch is connected to the raw material tank 1 through the first switching valve 3, and is connected to the gas-liquid separator 9 through the fourth switching valve 8), the second hydrogen production branch is in an impurity removal process or a cleaning process or a cut-off state (a cut-off state in which no hydrogen is produced, impurities are removed, or cleaning is performed after the impurity removal process and the cleaning process have been completed), and after a hydrogen production cycle, the second hydrogen production branch is switched to perform hydrogen production (the first switching valve 3 is switched to the outlet B, and the fourth switching valve 8 is switched to the inlet C);

[0146] After another hydrogen production cycle, switch to the first hydrogen production branch to produce hydrogen (the first switching valve 3 is switched to the outlet A, and the fourth switching valve 8 is switched to the inlet D);

[0147] The hydrogen production cycle is 1-80 hours.

[0148] In a specific embodiment of the present application, the hydrogen production cycle is 6 hours.

[0149] In the present invention, the first hydrogen production branch and the second hydrogen production branch in the hydrogen production system can be repeatedly switched to produce hydrogen in turn, thereby achieving the purpose of long-term stable hydrogen production.

[0150] In another specific implementation of the present embodiment, when the hydrogen flow rate (measured by the hydrogen flowmeter 12) decreases by 8%-30% compared with the standard hydrogen production flow rate of the metering pump 2, or the single hydrogen production time reaches the hydrogen production, impurity removal and cleaning cycle (1-80h), the first switching valve 3 and the fourth switching valve 8 are controlled to switch the state, and the original hydrogen production branch (the first hydrogen production branch or the second hydrogen production branch) performs the impurity removal process and the cleaning process, and the original hydrogen production branch that has not produced hydrogen performs the hydrogen production process.

[0151] In a specific implementation of the present embodiment, when the hydrogen flow rate (measured by the hydrogen flowmeter 12) of the first hydrogen production branch ( / the second hydrogen production branch) decreases by 12% compared with the standard hydrogen production flow rate of the metering pump 2, or the duration of a single hydrogen production reaches 6 hours (reaching a single hydrogen production cycle), the system switches to the second hydrogen production branch ( / the first hydrogen production branch) to produce hydrogen, and the first hydrogen production branch ( / the second hydrogen production branch) enters the impurity removal process and the cleaning process, and the switching is repeated in turn to achieve the purpose of long-term, efficient and stable hydrogen production.

[0152] In a specific implementation of this embodiment, the duration of the single impurity removal process is 1-20 minutes.

[0153] In a specific implementation of this embodiment, the duration of the single impurity removal process is 3 minutes.

[0154] In a specific implementation of this embodiment, the duration of the single cleaning process is 1-10 minutes.

[0155] In a specific implementation of this embodiment, the duration of the single cleaning process is 2 minutes.

[0156] In a specific implementation of this embodiment, when the hydrogen production branch (e.g., the second hydrogen production branch) that does not produce hydrogen is switched to the hydrogen production process, the hydrogen production branch (e.g., the first hydrogen production branch) that originally produces hydrogen first undergoes a removal process and then a cleaning process;

[0157] If the hydrogen production branch that originally produced hydrogen and is now switched to a hydrogen production branch that does not produce hydrogen (for example, the first hydrogen production branch) has completed the impurity removal process and the cleaning process, the hydrogen production branch that originally did not produce hydrogen and is now switched to a hydrogen production process (for example, the second hydrogen production branch) can still produce hydrogen stably and efficiently, then the hydrogen production branch that originally produced hydrogen and is now switched to a hydrogen production branch that does not produce hydrogen (for example, the first hydrogen production branch) is in a cut-off state (a state of not producing hydrogen, not removing impurities, and not cleaning), in which state, the first water pump 23 and / or the second water pump 27 do not work.

[0158] In a specific implementation of this embodiment, the catalytic tube (the first catalytic tube 4 and the second catalytic tube 5) has a liquid inlet at one end and a hydrogen outlet at the other end;

[0159] Its liquid inlet is connected to the first switching valve 3 , and its hydrogen outlet is connected to the fourth switching valve 8 .

[0160] In a specific implementation of this embodiment, the catalytic tubes (the first catalytic tube 4 and the second catalytic tube 5) have a pressure resistance of 1-5 bar and a capacity range of 0.1-5 L.

[0161] In a specific implementation of this embodiment, the pressure of the catalytic tubes (the first catalytic tube 4 and the second catalytic tube 5) is 4 bar, and the capacity range is 0.5L.

[0162] The present application also provides a control method for a hydrogen production system applied to the above hydrogen production system, the control method comprising:

[0163] If it is detected that the hydrogen production condition of the first hydrogen production branch drops by 12% or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control switches to the second hydrogen production branch to perform the hydrogen production process, and controls the first hydrogen production branch to perform the impurity removal process and the cleaning process;

[0164] If it is detected that the hydrogen production condition of the second hydrogen production branch drops by 12% or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control switches to the first hydrogen production branch to perform the hydrogen production process, and controls the second hydrogen production branch to perform the impurity removal process and the cleaning process.

[0165] Please see attached Figure 7 In a specific implementation of this embodiment, the hydrogen production system further includes: a monitoring and control component 29, which controls the switching of the connection state of the above-mentioned switching valves (the first switching valve to the sixth switching valve), the opening and closing of the solenoid valves (the first solenoid valve to the fourth solenoid valve), the opening and closing of the pump body (the metering pump, the first water pump and the second water pump), etc.;

[0166] The monitoring and control component 29 includes: an information receiving and sending unit 30, an information processing unit 31, a display unit 32, and an alarm unit 33;

[0167] The information receiving and sending unit 30 acquires system information and sends the information including the control instruction sent by the information processing unit 31 to the corresponding component to control the action of the corresponding component;

[0168] The information processing unit 31 sends corresponding information including control instructions to the information receiving and sending unit 30 according to the system information received by the information receiving and sending unit 30;

[0169] The display unit 32 displays the system information received by the information receiving and sending unit 30, and / or displays the information including the control instruction sent by the information processing unit 31;

[0170] The warning unit 33 sends reminder information and / or warning information in the form of sound (sound emitted by the speaker) or light (changes in light color and frequency) or electrical signals (corresponding electrical signals for controlling other components).

[0171] In a specific implementation of the present embodiment, the information processing unit 31 also has a timing function. When the switching action of the first switching valve and the fourth switching valve is started, so that the first hydrogen production branch or the second hydrogen production branch starts the hydrogen production process, the information processing unit 31 starts timing, and after the timing reaches a full hydrogen production cycle, generates and sends information containing control instructions for controlling the first switching valve and the fourth switching valve to the information receiving and sending unit 30; when the hydrogen production branch performs an impurity removal process or a cleaning process, the information processing unit 31 starts timing, and after reaching the preset time of the impurity removal process or the cleaning process, generates and sends information containing control instructions for controlling the corresponding switching valve action to the information receiving and sending unit 30;

[0172] Of course, the monitoring and control component 29 may also include a timing unit with a timing function (not shown in the figure). Through the cooperation of the timing unit, the information receiving and sending unit 30 and the information processing unit 31, the time of a single hydrogen production cycle (hydrogen production process duration), impurity removal process duration and cleaning process duration can be mastered.

[0173] In a specific implementation of this embodiment, the information receiving and sending unit 30 is electrically connected to the metering pump 2, the switching valve (the first switching valve to the sixth switching valve), the hydrogen flow meter 12, the solenoid valve (the first solenoid valve to the fourth solenoid valve), the liquid level meter 16, the pressure sensor 17, the first water pump 23, the second water pump 27 and the temperature sensor 28;

[0174] The information receiving and sending unit 30 actively acquires and / or passively receives the hydrogen flow information detected by the hydrogen flow meter 12, the liquid level information detected by the liquid level meter 16, the pressure information detected by the pressure sensor 17, the temperature information detected by the temperature sensor 28, and other system information;

[0175] The information receiving and sending unit 30 sends the information containing the control instructions sent by the information processing unit 31 to the corresponding components to control the actions of the corresponding components, such as controlling the switching state of the switching valve, controlling the opening and closing of the solenoid valve, controlling the opening and closing of the pump body (metering pump 2, the first water pump 23 and the second water pump 27), etc.

[0176] In another specific implementation of this embodiment, the monitoring and control component 29 further includes: an information acquisition and control execution unit (not shown in the figure), the information acquisition and control execution unit acquires the hydrogen flow information detected by the hydrogen flow meter 12, the liquid level information detected by the liquid level meter 16, the pressure information detected by the pressure sensor 17, the temperature information detected by the temperature sensor 28, and other system information, and then sends the acquired system information to the information receiving and sending unit 30;

[0177] The information collection and control execution unit receives the information containing the control instruction received and sent by the information receiving and sending unit 30 and sends it to the corresponding component to control the action of the corresponding component.

[0178] In a specific implementation of this embodiment, the information receiving and sending unit 30 obtains and transmits to the information processing unit 31 system information including, but not limited to: the liquid level height information in the gas-liquid separator 9 detected by the liquid level meter 16, and / or the working pressure information of the catalytic tube hydrogen production detected by the pressure sensor 17, and / or the temperature information of the impurity removal liquid detected by the temperature sensor 28.

[0179] In a specific implementation of this embodiment, the control method further includes:

[0180] If it is detected that the liquid level of the liquid accumulated in the gas-liquid separator reaches a predetermined liquid level standard, the second solenoid valve 14 is controlled to open.

[0181] In a specific implementation of this embodiment, the information receiving and sending unit 30 sends the acquired liquid level height information in the gas-liquid separator 9 detected by the liquid level meter 16 to the information processing unit 31;

[0182] The information processing unit 31 stores a predetermined liquid level standard;

[0183] Compare the detected liquid level height information in the gas-liquid separator 9 with the preset liquid level standard;

[0184] When the detected liquid level height information in the gas-liquid separator 9 reaches the preset liquid level standard, the information processing unit 31 sends information including a control instruction for opening the second solenoid valve 14 to the information receiving and sending unit 30 .

[0185] In a specific implementation of this embodiment, the information receiving and sending unit 30 sends the acquired working pressure information of the catalytic tube producing hydrogen detected by the pressure sensor 17 to the information processing unit 31;

[0186] The information processing unit 31 stores a preset maximum working pressure value and a preset minimum working pressure value;

[0187] Compare the detected working pressure information of the catalytic tube producing hydrogen with a preset maximum working pressure value and a preset minimum working pressure value;

[0188] When the detected working pressure information of the catalytic tube producing hydrogen is greater than or equal to the preset maximum working pressure value, the information processing unit 31 sends information containing control instructions to stop the metering pump 2 and open the fourth solenoid valve 18 to the information receiving and sending unit 30;

[0189] When the detected working pressure information of the catalytic tube producing hydrogen is less than or equal to the preset minimum working pressure value, the information processing unit 31 sends information containing control instructions to operate the metering pump 2 and close the fourth solenoid valve 18 to the information receiving and sending unit 30.

[0190] In a specific implementation of this embodiment, the control method further includes:

[0191] If it is detected that the temperature of the impurity removal liquid is lower than or equal to the preset minimum temperature standard, the second water pump 27 is controlled to start;

[0192] If it is detected that the temperature of the impurity removal liquid is higher than or equal to the preset maximum temperature standard, the second water pump 27 is controlled to stop running.

[0193] In a specific implementation of this embodiment, the information receiving and sending unit 30 sends the acquired temperature information of the impurity removal liquid detected by the temperature sensor 28 to the information processing unit 31;

[0194] The information processing unit 31 stores a preset minimum temperature standard and a preset maximum temperature standard;

[0195] Comparing the temperature information of the impurity removal liquid detected by the temperature sensor 28 with the preset minimum temperature standard and maximum temperature standard;

[0196] When the temperature information of the impurity removal liquid detected by the temperature sensor 28 is less than or equal to the preset minimum temperature standard, the information processing unit 31 sends information containing a control instruction to start the second water pump 27 to the information receiving and sending unit 30;

[0197] When the temperature information of the impurity removal liquid detected by the temperature sensor 28 is greater than or equal to the preset maximum temperature standard, the information processing unit 31 sends information including a control instruction to stop the operation of the second water pump 27 to the information receiving and sending unit 30 .

[0198] In a specific implementation of this embodiment, the information receiving and sending unit 30 controls the action of the corresponding component according to the information containing the control instruction for controlling the action of the corresponding component sent by the information processing unit 31 .

[0199] In a specific implementation of this embodiment, the display unit 32 includes a display screen, which displays information such as hydrogen production working pressure, hydrogen flow rate, hydrogen production cycle, hydrogen production working time, pressure relief pressure value, and monitored hydrogen concentration value.

[0200] The application of a hydrogen production system provided in the present application can overcome the problems of the existing hydrogen production system that it is unable to stably produce hydrogen for a long time and has low hydrogen production efficiency.

[0201] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A hydrogen production system, comprising a raw material box (1) and a metering pump (2) connected to the raw material box (1), wherein the raw material box (1) contains a hydrogen production raw material mixed liquid, wherein the hydrogen production raw material mixed liquid contains sodium borohydride, characterized in that: The hydrogen production system further comprises: A hydrogen production pipeline, the hydrogen production pipeline comprising a first hydrogen production branch and a second hydrogen production branch; through a first switching valve (3), the first hydrogen production branch and the second hydrogen production branch are connected to the discharge port of the metering pump (2), and the first hydrogen production branch or the second hydrogen production branch is in communication with the metering pump (2); a fourth switching valve (8) is also provided on the hydrogen production pipeline, and the fourth switching valve (8) is provided at one end of the first hydrogen production branch or the second hydrogen production branch away from the metering pump (2); when the first switching valve (3) is in communication with the first hydrogen production branch, the fourth switching valve (8) is also in communication with the first hydrogen production branch; when the first switching valve (3) is in communication with the second hydrogen production branch, the fourth switching valve (8) is also in communication with the second hydrogen production branch; a first catalytic tube (4) is provided on the first hydrogen production branch, and a second catalytic tube (5) is provided on the second hydrogen production branch; An impurity removal and cleaning pipeline, wherein the two ends of the impurity removal and cleaning pipeline are respectively connected through a second switching valve (6) and a third switching valve (7) and are arranged at the two ends of the first catalytic tube (4) or the second catalytic tube (5); When the first switching valve (3) is connected to the first hydrogen production branch, the impurity removal and cleaning pipeline is connected to both ends of the second catalytic tube (5) on the second hydrogen production branch; when the first switching valve (3) is connected to the second hydrogen production branch, the impurity removal and cleaning pipeline is connected to both ends of the first catalytic tube (4) on the first hydrogen production branch.

2. A hydrogen production system according to claim 1, characterized in that: The hydrogen production pipeline further comprises: a gas-liquid separator (9), a radiator (10), a water-gas separator (11), a hydrogen flow meter (12) and a first solenoid valve (13) which are connected in sequence; The gas-liquid separator (9) comprises a through port provided on its outer shell, and the through port of the gas-liquid separator (9) is connected to the external discharge port of the fourth switching valve (8).

3. A hydrogen production system according to claim 2, characterized in that: The gas-liquid separator (9) further comprises a liquid discharge port arranged on its shell, and the liquid discharge port of the gas-liquid separator (9) is connected to the external air of the system via a second solenoid valve (14); The water-gas separator (11) comprises a drain port; the drain port of the water-gas separator (11) is directly connected to the outside of the system, or is connected to the outside of the system via a third solenoid valve (15); The gas-liquid separator (9) is also provided with a liquid level meter (16); The opening of the gas-liquid separator (9) is also connected to an external discharge pipeline; The external discharge pipeline comprises: a pressure sensor (17), a fourth solenoid valve (18) and a flame arrester (19) arranged on the external discharge pipeline; One end of the flame arrester (19) away from the fourth solenoid valve (18) is in communication with the outside atmosphere; The gas-liquid separator (9) further comprises a pressure relief port arranged on its shell, and a pressure relief pipeline is connected to the pressure relief port of the gas-liquid separator (9); The pressure relief pipeline is provided with a mechanical safety pressure relief valve (20); One end of the pressure relief pipeline away from the pressure relief port is connected to a side of the flame arrester (19) away from the outside atmosphere.

4. A hydrogen production system according to claim 3, characterized in that: The impurity removal and cleaning pipeline comprises: An impurity removal box (21), wherein the impurity removal liquid is stored in the impurity removal box (21), and the impurity removal liquid is acetic acid or phosphoric acid solution; the impurity removal box (21) has a liquid outlet and a liquid return outlet; the impurity removal liquid passes through the liquid outlet of the impurity removal box (21), removes impurities from the first hydrogen production branch or the second hydrogen production branch, and then flows back to the impurity removal box (21) through the liquid return outlet of the impurity removal box (21); A water storage tank (22), wherein cleaning water is stored in the water storage tank (22), and the water storage tank (22) is not connected to the impurity removal tank (21); the water storage tank (22) has a liquid outlet; the cleaning water passes through the liquid outlet of the water storage tank (22), cleans the first hydrogen production branch or the second hydrogen production branch, and is then discharged to the outside of the system; the water storage tank (22) or the impurity removal tank (21) is connected to the second switching valve (6) via a fifth switching valve (24); A first water pump (23), wherein the first water pump (23) is arranged on a pipeline between the fifth switching valve (24) and the second switching valve (6).

5. A hydrogen production system according to claim 4, characterized in that: The hydrogen production system further comprises a temperature sensor (28) for detecting the temperature of the impurity removal liquid.

6. A hydrogen production system according to claim 4, characterized in that: The hydrogen production system further comprises a sixth switching valve (25), one end of the sixth switching valve (25) being in communication with an end of the third switching valve (7) away from the first switching valve (3); The sixth switching valve (25) enables the liquid outlet of the impurity removal tank (21) to communicate with the liquid return port of the impurity removal tank (21), or the sixth switching valve (25) enables the liquid outlet of the water storage tank (22) to communicate with the outside of the system.

7. A hydrogen production system according to claim 6, characterized in that: The hydrogen production system further comprises a circulation pipeline (26), wherein the circulation pipeline (26) is arranged around the outer circumference of the impurity removal box (21) and the outer circumference of the gas-liquid separator (9); The water storage tank (22) also has a first circulating liquid port and a second circulating liquid port, the first circulating liquid port is connected to one end of the circulating pipeline (26), and the second circulating liquid port is connected to the other end of the circulating pipeline (26); The circulation pipeline (26) is provided with a second water pump (27).

8. A control method for a hydrogen production system, applied to the hydrogen production system according to claim 7, characterized in that: The control method comprises: If it is detected that the hydrogen production condition of the first hydrogen production branch drops by 12% or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control switches to the second hydrogen production branch to perform the hydrogen production process, and controls the first hydrogen production branch to perform the impurity removal process and the cleaning process; If it is detected that the hydrogen production condition of the second hydrogen production branch drops by 12% or the duration of a single hydrogen production reaches a single hydrogen production cycle, the control switches to the first hydrogen production branch to perform the hydrogen production process, and controls the second hydrogen production branch to perform the impurity removal process and the cleaning process.

9. A control method for a hydrogen production system according to claim 8, characterized in that: The control method further comprises: If it is detected that the temperature of the impurity removal liquid is lower than or equal to a preset minimum temperature standard, the second water pump (27) is controlled to start; If it is detected that the temperature of the impurity removal liquid is higher than or equal to a preset maximum temperature standard, the second water pump (27) is controlled to stop running.

10. A control method for a hydrogen production system according to claim 8, characterized in that: The control method further comprises: If it is detected that the liquid level of the liquid accumulated in the gas-liquid separator reaches a predetermined liquid level standard, the second solenoid valve (14) is controlled to open.

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