Water electrolysis hydrogen production system

Abstract

The utility model discloses a water electrolysis hydrogen production system which comprises a water purification device, a water electrolysis hydrogen production device, a hydrogen purification device and a hydrogen conveying device, and the water purification device comprises a water purifier; the water electrolysis hydrogen production device comprises a water supply module, an electrolytic bath and a water-vapor separator, the water supply module comprises a water tank, a circulating water pump and a heat exchanger, the water tank is connected with the water purifier, the electrolytic bath is provided with a pure water inlet and a hydrogen outlet, the water tank is provided with a first water level meter, a heating element and a thermometer, the water-vapor separator is provided with a second water level meter, and the pure water inlet is provided with a conductivity meter; the inlet end of the hydrogen purification device is connected with the gas outlet of the water-vapor separator; the hydrogen conveying device comprises a back pressure valve, a flow meter and a dew-point instrument, the inlet end of the back pressure valve is connected with the outlet end of the hydrogen purification device, and the outlet end of the back pressure valve is connected with the flow meter and the dew-point instrument respectively. The hydrogen purification device can improve the hydrogen purity, flexibly control the temperature of pure water and accurately check system faults in time.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a water electrolysis hydrogen production system. Background Art

[0002] Hydrogen production by water electrolysis is the most commonly used method of hydrogen production. However, the related technology still has the following defects: some existing large-scale hydrogen production stations have complex structures, large scales, and high costs, which cannot meet the needs of small-scale hydrogen use. Some existing small-scale hydrogen production machines have imperfect functions, which may lead to problems such as insufficient hydrogen purity, difficulty in matching the temperature of pure water required for electrolysis, and inability to troubleshoot faults, thereby affecting the service life of the water electrolyzer. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a water electrolysis hydrogen production system that can improve hydrogen purity, flexibly control pure water temperature, and promptly and accurately troubleshoot system failures.

[0004] A water electrolysis hydrogen production system according to an embodiment of the present invention includes:

[0005] Water purification equipment, including water purifiers;

[0006] A water electrolysis hydrogen production device, comprising a water supply module, an electrolyzer and a water vapor separator, wherein the water supply module comprises a water tank, a circulating water pump and a heat exchanger connected in sequence, the water tank is connected to the water purifier, the electrolyzer is provided with a pure water inlet connected to the outlet end of the heat exchanger, and a hydrogen outlet connected to the water vapor separator, the water tank is provided with a first water level meter, a heating element and a thermometer, the water vapor separator is provided with a second water level meter, and the pure water inlet is provided with a conductivity meter;

[0007] A hydrogen purification device, wherein the inlet end of the hydrogen purification device is connected to the gas outlet of the water vapor separator;

[0008] The hydrogen transmission device includes a back pressure valve, a flow meter and a dew point meter. The inlet end of the back pressure valve is connected to the outlet end of the hydrogen purification device, and the outlet end of the back pressure valve is connected to the flow meter and the dew point meter respectively.

[0009] The water electrolysis hydrogen production system according to the embodiment of the present invention has at least the following beneficial effects: the present invention can convert the input ordinary water into the output pure water through the water purifier and transport it to the water tank, heat the pure water in the water tank to the set temperature through the heating element, monitor the liquid level and temperature of the pure water respectively through the first water level meter and the thermometer, and the circulating water pump transports the pure water in the water tank to the electrolytic cell at a certain flow rate for electrolysis reaction, and detects the conductivity of the pure water through the conductivity meter to determine whether the conductivity is qualified, wherein the pure water is heat exchanged through the heat exchanger to make The pure water is at the optimal working water temperature, and the water-hydrogen mixture produced by electrolysis enters the water vapor separator to separate water and hydrogen. The liquid level of the water vapor separator is monitored by a second water level meter to ensure the normal operation of the water vapor separator. The separated hydrogen enters the hydrogen purification device for purification. The purified hydrogen is output through a back pressure valve and a flow meter. The output of hydrogen is monitored by the flow meter, and the temperature when the water in the gas reaches saturation is measured by a dew point meter. The utility model can improve the purity of hydrogen, flexibly control the pure water temperature, and can timely and accurately detect system faults.

[0010] According to some embodiments of the present invention, the water electrolysis hydrogen production system further includes a pressure relief device, which includes a pressure relief valve, and an inlet end of the pressure relief valve is connected to an outlet end of the hydrogen purification device.

[0011] According to some embodiments of the present invention, the pressure relief device further includes a water seal box, which is connected to the outlet end of the pressure relief valve and is provided with a first drain pipe and a third water level gauge.

[0012] According to some embodiments of the present invention, the water electrolysis hydrogen production system also includes a wastewater discharge pipe, the water tank is provided with a first drain port, the water vapor separator is provided with a second drain port, the water seal box is provided with a third drain port, a first drain valve is provided between the first drain port and the wastewater discharge pipe, a second drain valve is provided between the second drain port and the wastewater discharge pipe, and a third drain valve is provided between the third drain port and the wastewater discharge pipe.

[0013] According to some embodiments of the present invention, a water inlet valve is provided between the water purifier and the water tank.

[0014] According to some embodiments of the present invention, the water electrolysis hydrogen production system also includes a control alarm module, which includes an alarm, a controller, a communication device, and a monitoring center. The controller is respectively connected to the first water level meter, the conductivity meter, the second water level meter, the thermometer, the flow meter, the third water level meter, the back pressure valve, the pressure relief valve, the water inlet valve, the first drain valve, the second drain valve, the third drain valve, and the heating element. The controller is connected to the monitoring center through the communication device.

[0015] According to some embodiments of the present invention, a pressure reducing valve is connected between the dew point meter and the back pressure valve.

[0016] According to some embodiments of the present invention, the electrolytic cell is provided with the oxygen water outlet connected to the water tank, and the water tank is connected to a second drain pipe.

[0017] According to some embodiments of the present invention, a filter is provided between the heat exchanger and the pure water inlet.

[0018] According to some embodiments of the present invention, the hydrogen purification device includes a first drying tower and a second drying tower connected in sequence.

[0019] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic structural diagram of the water electrolysis hydrogen production system of the present invention;

[0022] Figure 2 This is a schematic diagram of the control flow of the water electrolysis hydrogen production system of the utility model;

[0023] Figure Number:

[0024] Water purification device 100; water purifier 110; water inlet valve 111;

[0025] Water electrolysis hydrogen production device 200; water supply module 210; electrolyzer 220; pure water inlet 221; hydrogen outlet 222; oxygen water outlet 223; water vapor separator 230; second water level gauge 231; second drain outlet 232; water tank 240; first water level gauge 241; heating element 242; thermometer 243; first drain outlet 244; second drain pipe 245; circulating water pump 250; heat exchanger 260; conductivity meter 270; filter 280;

[0026] Hydrogen purification device 300; first drying tower 310; second drying tower 320;

[0027] Hydrogen delivery device 400; back pressure valve 410; flow meter 420; dew point meter 430; pressure reducing valve 440;

[0028] Pressure relief device 500; pressure relief valve 510; water seal box 520; first drain pipe 521; third water level gauge 522; third drain port 523;

[0029] Wastewater discharge pipe 600; first drain valve 610; second drain valve 620; third drain valve 630;

[0030] Alarm 700;

[0031] Controller 800;

[0032] Communication equipment 900; monitoring center 910. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0038] Hydrogen production by water electrolysis is the most commonly used method for hydrogen production. The relevant technology still has the following defects: some existing large-scale hydrogen production stations have complex structures, large scales, and high costs, which cannot meet the needs of small-scale hydrogen use. Some existing small-scale hydrogen production machines have imperfect functions, which may lead to problems such as insufficient hydrogen purity, difficulty in matching the temperature of pure water required for electrolysis, and inability to troubleshoot faults, thereby affecting the service life of the water electrolysis cell 220.

[0039] Furthermore, the utility model proposes a water electrolysis hydrogen production system, which can improve the purity of hydrogen, flexibly control the temperature of pure water, and can timely and accurately detect system failures.

[0040] like Figure 1 As shown, the water electrolysis hydrogen production system of the embodiment of the present invention includes a water purification device 100, a water electrolysis hydrogen production device 200, a hydrogen purification device 300 and a hydrogen transmission device 400.

[0041] The water purification device 100 of the embodiment of the present invention includes a water purifier 110 , which can convert input ordinary water into output pure water.

[0042] The water electrolysis hydrogen production device 200 of the embodiment of the present invention includes a water supply module 210, an electrolyzer 220 and a water vapor separator 230, which are connected in sequence, wherein the water supply module 210 includes a water tank 240, a circulating water pump 250 and a heat exchanger 260 connected in sequence, the outlet end of the pure water machine 110 is connected to the water tank 240, and pure water is supplied to the water tank 240. The water tank 240 is provided with a first water level meter 241, a heating element 242 and a thermometer 243. The first water level meter 241 is used to detect the water level in the water tank 240, and the heating element 242 is used to heat the pure water. The heating element 242 uses a heating rod. In other embodiments, other heating elements 242 may be used, and the thermometer 243 is used to monitor the water temperature to ensure that the water temperature is not too high or too low.

[0043] The electrolyzer 220 is provided with a pure water inlet 221 and a hydrogen outlet 222. The pure water inlet 221 is connected to the outlet end of the heat exchanger 260, and the hydrogen outlet 222 is connected to the water vapor separator 230. During operation, the circulating water pump 250 is started, and the circulating water pump 250 pumps water out of the water tank 240 and flows into the electrolyzer 220 through the heat exchanger 260. The heat exchanger 260 is used to exchange heat with pure water. The heat exchanger 260 can cool or heat the pure water so that the pure water temperature at the pure water inlet 221 reaches the optimal working water temperature of the electrolyzer 220, so as to achieve accurate control of the water temperature. It can be understood that the water tank 240 performs primary control on the water temperature, while the heat exchanger 260 performs secondary control on the water temperature.

[0044] In the embodiment of the present invention, a conductivity meter 270 is provided in the pipeline at the pure water inlet 221 . The conductivity meter 270 is used to detect the conductivity of the pure water to determine whether the conductivity of the pure water is qualified.

[0045] The water-hydrogen mixture produced by electrolysis is separated by the water vapor separator 230, the water is retained at the bottom of the water vapor separator 230, and the hydrogen continues to be transported forward. The water vapor separator 230 of the embodiment of the present invention is provided with a second water level meter 231, which is used to detect the liquid level in the water vapor separator 230 to detect whether the water vapor separator 230 is working normally.

[0046] The inlet end of the hydrogen purification device 300 is connected to the gas outlet of the water vapor separator 230 , and the hydrogen purification device 300 is used to purify the separated hydrogen.

[0047] The hydrogen transmission device 400 of the embodiment of the present invention includes a back pressure valve 410, a flow meter 420 and a dew point meter 430. The inlet end of the back pressure valve 410 is connected to the outlet end of the hydrogen purification device 300, and the outlet end of the back pressure valve 410 is connected to the flow meter 420 and the dew point meter 430 respectively. The back pressure valve 410 is used to maintain the stability of the hydrogen pressure in the hydrogen transmission device 400. During the operation of the system, it automatically adjusts to open and close according to the set pressure value to ensure that the pressure of the hydrogen output by the device is within a stable range. The flow meter 420 is used to detect the output flow rate of hydrogen, and the dew point meter 430 is used to measure the temperature when the water in the gas reaches saturation.

[0048] The utility model can convert the input ordinary water into output pure water through the water purifier 110 and transport it to the water tank 240. The pure water in the water tank 240 is heated to a set temperature by the heating element 242. The liquid level and temperature of the pure water are monitored respectively by the first water level meter 241 and the thermometer 243. The circulating water pump 250 transports the pure water in the water tank 240 to the electrolytic cell 220 at a certain flow rate for electrolysis reaction. The conductivity of the pure water is detected by the conductivity meter 270 to determine whether the conductivity is qualified. The pure water is heat-exchanged through the heat exchanger 260 to keep the pure water at the optimal working water temperature. The water-hydrogen mixture produced by electrolysis enters the water vapor separator 230 to separate water and hydrogen. The liquid level of the water vapor separator 230 is monitored by the second water level meter 231 to ensure the normal operation of the water vapor separator 230. The separated hydrogen enters the hydrogen purification device 300 for purification. The purified hydrogen is output through the back pressure valve 410 and the flow meter 420. The output of hydrogen is monitored by the flow meter 420, and the temperature when the water in the gas reaches saturation is measured by the dew point meter 430. The utility model can improve the purity of hydrogen, flexibly control the pure water temperature, and can timely and accurately detect oil system faults.

[0049] Furthermore, the water electrolysis hydrogen production system also includes a pressure relief device 500, which includes a pressure relief valve 510. The inlet end of the pressure relief valve 510 is connected to the outlet end of the hydrogen purification device 300. When the pressure in the system is higher than the set value, the system pipeline is depressurized through the pressure relief valve 510.

[0050] The pressure relief device 500 further includes a water seal box 520, which is connected to the outlet of the pressure relief valve 510. The water seal box 520 is equipped with a first drain pipe 521 and a third water level gauge 522. During pressure relief, gas is discharged from the first drain pipe 521. The water level in the water seal box 520 must be kept stable to ensure that the water level does not become too low or overflow during normal operation. If the water level is too low, gas may escape, thereby losing the water seal function. If the water level is too high, system resistance may increase or liquid may overflow. In this embodiment, the third water level gauge 522 is used to monitor the liquid level in the water seal box 520.

[0051] The hydrogen purification device 300 of the embodiment of the present invention includes a first drying tower 310 and a second drying tower 320 connected in sequence. The two drying towers can be adjusted to a drying state or a regeneration state. One end of the first drying tower 310 is connected to the hydrogen outlet 222, and the other end of the first drying tower 310 is connected to one end of the second drying tower 320. The other end of the second drying tower 320 is respectively connected to a pressure relief valve 510 and a back pressure valve 410. When the drying towers are in the drying state, hydrogen is dried by the two drying towers and then discharged through the back pressure valve 410; when the drying towers are in the regeneration state, hydrogen enters the drying tower in the regeneration state for purge regeneration, and the purge exhaust gas is discharged through the pressure relief valve 510. The drying towers will periodically switch between the two working states to achieve hydrogen purification.

[0052] The water electrolysis hydrogen production system of the embodiment of the present invention also includes a wastewater discharge pipe 600, the water tank 240 is provided with a first drain port 244, the water vapor separator 230 is provided with a second drain port 232, and the water seal box 520 is provided with a third drain port 523. A first drain valve 610 is provided between the first drain port 244 and the wastewater discharge pipe 600, a second drain valve 620 is provided between the second drain port 232 and the wastewater discharge pipe 600, and a third drain valve 630 is provided between the third drain port 523 and the wastewater discharge pipe 600. When the liquid level in the water tank 240 is higher than the set value, the pure water is discharged to the wastewater discharge pipe 600 by opening the first drain valve 610. When the liquid level in the water vapor separator 230 is higher than the set value, the pure water is discharged to the wastewater discharge pipe 600 by opening the second drain valve 620. When the liquid level in the water seal box 520 is higher than the set value, the pure water is discharged to the wastewater discharge pipe 600 by opening the third drain valve 630.

[0053] When flushing the water tank 240 , sewage can also be discharged by opening the first drain valve 610 .

[0054] In the embodiment of the present invention, a water inlet valve 111 is provided between the water purifier 110 and the water tank 240 . When the liquid level of the water tank 240 is lower than a set value, the water inlet valve 111 is opened to replenish water to the water tank 240 .

[0055] In this embodiment, a pressure reducing valve 440 is connected between the dew point meter 430 and the back pressure valve 410 . The pressure reducing valve 440 is used to protect the dew point meter 430 .

[0056] The electrolytic cell 220 of this embodiment is provided with an oxygen outlet 223 connected to the water tank 240 , and the water tank 240 is connected to a second drain pipe 245 . The oxygen-water mixture produced by electrolysis flows back to the water tank 240 through the oxygen outlet 223 , and the oxygen is discharged through the second drain pipe 245 .

[0057] In the embodiment of the present invention, a filter 280 is provided between the heat exchanger 260 and the pure water inlet 221 , and the pure water is filtered through the filter 280 .

[0058] Furthermore, the water electrolysis hydrogen production system also includes a control alarm module, which includes an alarm 700, a controller 800, a communication device 900, and a monitoring center 910. The controller 800 is respectively connected to the first water level meter 241, the conductivity meter 270, the second water level meter 231, the thermometer 243, the flow meter 420, the third water level meter 522, the back pressure valve 410, the pressure relief valve 510, the water inlet valve 111, the first drain valve 610, the second drain valve 620, and the third drain valve 630. The controller 800 is connected to the monitoring center 910 via the communication device 900. It can be understood that the first water level meter 241, the conductivity meter 270, the second water level meter 231, the thermometer 243, the flow meter 420, the third water level meter 522, the back pressure valve 410, the pressure relief valve 510, the water inlet valve 111, the first drain valve 610, the second drain valve 620, and the third drain valve 630. 22 is classified as a sensor mechanism, while the back pressure valve 410, the pressure relief valve 510, the water inlet valve 111, the first drain valve 610, the second drain valve 620, the third drain valve 630 and the heating element 242 are classified as actuators. The sensor mechanism is mainly used to monitor relevant data and provide a decision basis for the controller 800. The controller 800 adopts PLC and is the core of the system. The controller 800 is responsible for receiving instructions, processing data and sending control signals. The actuator is used to receive control signals from the controller 800 and perform corresponding actions. The communication equipment 900 is used to realize data transmission between the controller 800 and the monitoring center 910; the monitoring center 910 is used to receive data uploaded by the controller 800 and send control instructions to the controller 800.

[0059] When the temperature of the pure water in the water tank 240 is lower than the preset value, the heating element 242 will continue to work. When the temperature is higher than the threshold, the controller 800 will transmit the stop-working instruction to the heating element 242. The three water level meters respectively monitor the liquid levels of the water tank 240, the water vapor separator 230 and the water seal box 520. When the water level exceeds the warning height, the controller 800 will turn on the alarm 700, and the corresponding drain valve can also be opened or closed through the monitoring center 910; when the water level of the water tank 240 is lower than the set value, the water inlet valve 111 will be controlled to open.

[0060] Conductivity meter 270, installed at the water inlet of electrolytic cell 220, tests the conductivity of pure water. If the conductivity fails to meet the standard, alarm 700 is activated via controller 800. Dew point meter 430 measures the temperature at which the gas reaches saturation with water. Flow meter 420 measures the flow rate at the hydrogen outlet. These data are transmitted in real time to monitoring center 910.

[0061] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0062] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that: include: Water purification equipment, including water purifiers; A water electrolysis hydrogen production device, comprising a water supply module, an electrolyzer and a water vapor separator, wherein the water supply module comprises a water tank, a circulating water pump and a heat exchanger connected in sequence, the water tank is connected to the water purifier, the electrolyzer is provided with a pure water inlet connected to the outlet end of the heat exchanger, and a hydrogen outlet connected to the water vapor separator, the water tank is provided with a first water level meter, a heating element and a thermometer, the water vapor separator is provided with a second water level meter, and the pure water inlet is provided with a conductivity meter; A hydrogen purification device, wherein the inlet end of the hydrogen purification device is connected to the gas outlet of the water vapor separator; The hydrogen transmission device includes a back pressure valve, a flow meter and a dew point meter. The inlet end of the back pressure valve is connected to the outlet end of the hydrogen purification device, and the outlet end of the back pressure valve is connected to the flow meter and the dew point meter respectively.

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further includes a pressure relief device, which includes a pressure relief valve, and an inlet end of the pressure relief valve is connected to an outlet end of the hydrogen purification device.

3. The water electrolysis hydrogen production system according to claim 2, characterized in that: The pressure relief device further comprises a water seal box, which is connected to the outlet end of the pressure relief valve and is provided with a first drain pipe and a third water level gauge.

4. The water electrolysis hydrogen production system according to claim 3, characterized in that: The water electrolysis hydrogen production system also includes a wastewater discharge pipe, the water tank is provided with a first drain port, the water vapor separator is provided with a second drain port, the water seal box is provided with a third drain port, a first drain valve is provided between the first drain port and the wastewater discharge pipe, a second drain valve is provided between the second drain port and the wastewater discharge pipe, and a third drain valve is provided between the third drain port and the wastewater discharge pipe.

5. The water electrolysis hydrogen production system according to claim 4, characterized in that: A water inlet valve is provided between the water purifier and the water tank.

6. The water electrolysis hydrogen production system according to claim 5, characterized in that: The water electrolysis hydrogen production system also includes a control alarm module, which includes an alarm, a controller, a communication device, and a monitoring center. The controller is respectively connected to the first water level meter, the conductivity meter, the second water level meter, the thermometer, the flow meter, the third water level meter, the back pressure valve, the pressure relief valve, the water inlet valve, the first drain valve, the second drain valve, the third drain valve, and the heating element. The controller is connected to the monitoring center through the communication device.

7. The water electrolysis hydrogen production system according to claim 1, characterized in that: A pressure reducing valve is connected between the dew point meter and the back pressure valve.

8. The water electrolysis hydrogen production system according to claim 1, characterized in that: The electrolytic cell is provided with an oxygen water outlet connected to the water tank, and the water tank is connected to a second drain pipe.

9. The water electrolysis hydrogen production system according to claim 1, characterized in that: A filter is provided between the heat exchanger and the pure water inlet.

10. The water electrolysis hydrogen production system according to claim 1, characterized in that: The hydrogen purification device includes a first drying tower and a second drying tower connected in sequence.

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