Water electrolysis hydrogen production system

Abstract

According to the water electrolysis hydrogen production system, at least one of online reduction of the conductivity of pure water by the oxygen side gas-liquid separator and recycling of drained water of the hydrogen side gas-liquid separator is achieved. The water electrolysis hydrogen production system comprises an oxygen side gas-liquid separator, a hydrogen side gas-liquid separator, a pure water collection part and a pure water preparation system, the pure water preparation system is used for preparing pure water and comprises a liquid inlet formed in the head end of the pure water preparation system and a pure water outlet formed in the tail end of the pure water preparation system, and the pure water collection part comprises a first inlet, a second inlet and a water supply port. The pure water outlet is communicated with the first inlet; wherein a water outlet and a liquid inlet of an oxygen side liquid cavity of the oxygen side gas-liquid separator can be communicated or disconnected, and a water inlet and a water supply port of the oxygen side liquid cavity can be communicated or disconnected; and / or the water electrolysis hydrogen production system further comprises a hydrogen removal device, a water outlet of the hydrogen side liquid cavity of the hydrogen side gas-liquid separator is communicated with a water inlet of the hydrogen removal device, and a water outlet of the hydrogen removal device can be communicated with or disconnected from the second inlet.

Description

Technical Field

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

[0002] In the process of hydrogen production by water electrolysis, the electrolyzer, as a core component, decomposes water into hydrogen and oxygen through the selective permeability of the proton exchange membrane. The decomposed oxygen is transported to the oxygen side gas-liquid separator for operation, and the hydrogen is transported to the hydrogen side gas-liquid separator for operation. In the oxygen side gas-liquid separator, the oxygen side liquid chamber contains a separation liquid, and the separation liquid has a set conductivity requirement. However, due to various factors, the conductivity of the separation liquid will not meet the set conductivity requirement after a certain period of time; in order to make the separation liquid meet the set conductivity requirement, the traditional method uses an ion removal resin to reduce the conductivity of the separation liquid. However, since the ion removal resin will fail under a high-pressure environment, this results in the need to control the water electrolysis hydrogen production system to suspend operation when the conductivity of the separation liquid is reduced, and the separation liquid of the oxygen side gas-liquid separator is reduced. After the conductivity is reduced, the water electrolysis hydrogen production system is restarted, which not only affects the working efficiency of the water electrolysis hydrogen production system, but also increases the complexity and cost of the subsequent processing process.

[0003] There is a problem of hydrogen content in the drainage water in the hydrogen side gas-liquid separator. Due to the solubility and diffusivity of hydrogen, the separation liquid often contains a certain amount of hydrogen. This results in the separation liquid containing hydrogen in the hydrogen side gas-liquid separator can only be discharged as wastewater, resulting in a huge waste of energy.

[0004] In view of this, those skilled in the art are in urgent need of providing a technical solution to solve at least one of the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the invention is to provide a water electrolysis hydrogen production system. By improving the system, at least one of online reduction of pure water conductivity by an oxygen-side gas-liquid separator and recycling of wastewater from a hydrogen-side gas-liquid separator is achieved.

[0006] To achieve the above-mentioned object, the present invention provides a water electrolysis hydrogen production system, comprising an oxygen-side gas-liquid separator, a hydrogen-side gas-liquid separator, a pure water collection part and a pure water preparation system, wherein the pure water preparation system is used to prepare pure water, and comprises a liquid inlet arranged at the head end of the pure water preparation system and a pure water outlet arranged at the tail end, the pure water collection part comprises a first inlet and a water supply port, and the pure water outlet is connected to the first inlet; wherein,

[0007] The oxygen-side gas-liquid separator is provided with an oxygen-side liquid chamber, the water outlet of the oxygen-side liquid chamber can be connected or disconnected with the liquid inlet, and the water inlet of the oxygen-side liquid chamber can be connected or disconnected with the water supply port; in this way, the conductivity of the separated liquid in the oxygen-side liquid chamber of the oxygen-side gas-liquid separator is reduced online, the working efficiency of the water electrolysis hydrogen production system is improved, and the complexity and cost of the subsequent processing process are reduced; at the same time, the separated liquid in the oxygen-side liquid chamber is collected into the pure water preparation system through the liquid inlet, thereby realizing repeated recycling and reducing the energy consumption of the water electrolysis hydrogen production system.

[0008] Alternatively, the water electrolysis hydrogen production system also includes a hydrogen removal device, the pure water collection portion includes a second inlet, the hydrogen side gas-liquid separator has a hydrogen side liquid chamber, the water outlet of the hydrogen side liquid chamber is connected to the water inlet of the hydrogen removal device, and the water outlet of the hydrogen removal device can be connected or disconnected from the second inlet.

[0009] By setting up a dehydrogenation device to dehydrogenate the separation liquid in the hydrogen side liquid chamber, the hydrogen content of the separation liquid in the hydrogen side gas-liquid separator is reduced, and the separation liquid after dehydrogenation is connected to the pure water collection part; on the one hand, the emission of the hydrogen side gas-liquid separator is reduced, and on the other hand, the separation liquid after dehydrogenation is reused to save energy.

[0010] Or, the water electrolysis hydrogen production system includes an oxygen side gas-liquid separator, a hydrogen side gas-liquid separator, a pure water collection part and a pure water preparation system, the pure water preparation system is used to prepare pure water, including a liquid inlet arranged at the head end of the pure water preparation system, and a pure water outlet arranged at the tail end, the pure water collection part includes a first inlet and a water supply port, and the pure water outlet is connected to the first inlet; wherein,

[0011] The oxygen-side gas-liquid separator has an oxygen-side liquid chamber, the water outlet of the oxygen-side liquid chamber can be connected or disconnected with the liquid inlet, and the water inlet of the oxygen-side liquid chamber can be connected or disconnected with the water supply port;

[0012] The water electrolysis hydrogen production system also includes a hydrogen removal device, the pure water collection part includes a second inlet, the hydrogen side gas-liquid separator has a hydrogen side liquid chamber, the water outlet of the hydrogen side liquid chamber is connected to the water inlet of the hydrogen removal device, and the water outlet of the hydrogen removal device can be connected or disconnected with the second inlet.

[0013] In this way, the conductivity of the separation liquid in the oxygen side liquid chamber of the oxygen side gas-liquid separator is reduced online, and the emission of the hydrogen side gas-liquid separator is also reduced; at the same time, the separation liquids in the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator are connected to different positions in the pure water preparation system according to their different characteristics, thereby realizing the reuse of the separation liquid, reducing the supply of external pure water, reducing the loss of the pure water preparation system, and significantly improving the pure water preparation efficiency.

[0014] Optionally, the dehydrogenation device includes a liquid discharge pipeline and a liquid discharge sub-pipe, a first liquid valve is arranged on the liquid discharge pipeline, and the position where the liquid discharge sub-pipe is connected to the liquid discharge pipeline is located between the water outlet of the dehydrogenation device and the first liquid valve; the other end of the liquid discharge sub-pipe is connected to the second inlet, and the liquid discharge sub-pipe is also provided with a second liquid valve; the water electrolysis hydrogen production system also includes a controller and a hydrogen detection component, the hydrogen detection component is used to detect the hydrogen concentration of the pure water collection part, and the controller, the hydrogen detection component, the first liquid valve and the second liquid valve are signal-connected.

[0015] A hydrogen detection component is provided to monitor the hydrogen content in the pure water collecting part, and the controller selects to open the first liquid valve or the second liquid valve according to the hydrogen content in the pure water collecting part to discharge the separation liquid in the hydrogen side liquid chamber or to collect the separation liquid in the hydrogen side liquid chamber into the pure water collecting part; thus, an error correction process is designed for the water electrolysis hydrogen production system to ensure that when a failure occurs in the hydrogen removal device, the separation liquid containing hydrogen can be prevented from being mistakenly discharged into the pure water collecting part in time, thereby ensuring the safety of the system and the purity of the pure water.

[0016] Optionally, the opening and closing states of the first liquid valve and the second liquid valve are mutually exclusive. In this way, when it is detected that the hydrogen content in the pure water collection part exceeds the standard, the first liquid valve is opened and the second liquid valve is closed to discharge the separation liquid to avoid contaminating the pure water in the pure water collection part; after the dehydrogenation device is overhauled, the first liquid valve is closed and the second liquid valve is opened to recover the separation liquid in the hydrogen side gas-liquid separator again.

[0017] Optionally, the water outlet of the oxygen side liquid chamber is connected to the liquid inlet through a waste liquid discharge pipeline, and the waste liquid discharge pipeline is provided with a third liquid valve; the water supply port is connected to the oxygen side liquid chamber through a liquid supply pipeline, and the liquid supply pipeline is provided with a fourth liquid valve; the water electrolysis hydrogen production system also includes a conductivity meter, and the conductivity meter is used to measure the conductivity of the separation liquid in the oxygen side liquid chamber; the controller is respectively connected to the conductivity meter, the third liquid valve and the fourth liquid valve signal. Thus, the conductivity of the separation liquid in the oxygen side liquid chamber is monitored in real time using the conductivity meter, so that the third liquid valve and the fourth liquid valve are opened and closed according to the conductivity, so as to ensure that the conductivity of the separation liquid in the oxygen side liquid chamber is always within the set range.

[0018] Optionally, the waste liquid discharge pipeline and the liquid supply pipeline have the same flow rate per unit time. Thus, the discharge amount and supply amount of the separation liquid in the oxygen side liquid chamber can be kept constant by controlling the opening and closing states of the third liquid valve and the fourth liquid valve to be consistent.

[0019] In any of the above embodiments, a box body is included, a liquid collecting chamber is provided at the bottom of the box body, a receiving space is formed between the liquid collecting chamber and the top plate of the box body, a discharge end is provided in the receiving space, and the discharge end is communicated with the hydrogen side liquid chamber.

[0020] Therefore, by providing the ejection end, the separation liquid in the hydrogen side liquid chamber can be atomized and ejected, thereby increasing the contact area between the separation liquid and the air, making it easier for hydrogen to precipitate from the separation liquid.

[0021] Optionally, a first impact surface is further provided in the accommodating space, and the first impact surface is opposite to the ejection end in its ejection direction so as to form a stopper for the separation liquid ejected from the ejection end.

[0022] By arranging the impact surface to form a stopper for the separation liquid in the ejection direction, the separation liquid is ejected to the impact surface, thereby further increasing the rate of hydrogen precipitation in the separation liquid.

[0023] Optionally, a second impact surface is further provided in the accommodating space, and the second impact surface is located at the lower side of the ejection end in the height direction, and the second impact surface is at least partially spaced from the side wall of the box body; it is defined that the separation liquid ejected from the ejection end falls in the height direction to form a falling range, and the falling range is at least partially located on the second impact surface.

[0024] As a result, the separation liquid can form a secondary collision with the second collision surface during the falling process, thereby facilitating further precipitation of hydrogen in the separation liquid.

[0025] Optionally, the second impact surface has an inclined surface section, and the inclined surface section is inclined in the height direction from the side away from the liquid collecting chamber to the side close to the liquid collecting chamber. Thus, the inclined surface section plays a role of guiding flow, which can reduce the height of the separation liquid entering the liquid collecting chamber and reduce the disturbance of the separation liquid on the separation liquid in the liquid collecting chamber.

[0026] Optionally, a side wall of the box body is provided with an overflow port, which is located above the liquid surface of the liquid collecting chamber; in the horizontal direction, the overflow port is located on a side of the inclined surface section away from the liquid collecting chamber.

[0027] Therefore, the overflow port is located away from the position where the separation liquid enters the liquid collecting chamber. After the separation liquid enters the liquid collecting chamber, hydrogen will further precipitate during its circulation. The overflow port is set on the side away from the liquid inlet side of the liquid collecting chamber, which can ensure that the separation liquid overflowing through the overflow port has sufficient time for hydrogen precipitation.

[0028] Optionally, at least one liquid partition plate is further provided, wherein a portion of the liquid partition plate is located in the liquid collecting cavity and is spaced apart from the bottom plate of the box body; and a portion of the liquid partition plate is located outside the liquid collecting cavity;

[0029] The top end, the bottom end and the liquid partition plate of the inclined surface section are projected in the height direction, and the projection ranges are parallel.

[0030] Optionally, a liquid partition plate is further provided, wherein part of the liquid partition plate is located in the liquid collecting cavity and has a spacing portion between the liquid partition plate and the bottom plate of the box body, and part of the liquid partition plate is located outside the liquid collecting cavity;

[0031] The liquid partition plate has a first surface and a second surface, the first surface and the second surface extend in the height direction; the first surface and a part of the side wall of the box body define a first liquid cavity, and the second surface and another part of the side wall of the box body define a second liquid cavity; the first liquid cavity and the second liquid cavity are connected through the partition;

[0032] The liquid collecting chamber is defined as having a liquid receiving side and a liquid discharging side, the liquid receiving side being the side where the bottom end of the inclined surface section is located, and the liquid discharging side being the side where the overflow port is located; at least one of the first liquid chamber and the second liquid chamber is located on the liquid receiving side, and the other is located on the liquid discharging side. By providing a liquid partition plate, the separation liquid in the liquid collecting chamber can be diverted, further extending the flow path of the separation liquid in the liquid collecting chamber, giving the hydrogen more time to volatilize.

[0033] Other features and advantages of the present specification will become apparent from the detailed description of exemplary embodiments of the present specification with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0035] Figure 1 is a schematic structural diagram of a water electrolysis hydrogen production system according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic structural diagram of a hydrogen removal device in an embodiment of the present invention.

[0037] Reference numerals: 1- oxygen side gas-liquid separator; 11- waste liquid discharge pipeline; 12- liquid supply pipeline; 2- hydrogen side gas-liquid separator; 21- drainage pipeline; 22- drainage sub-pipe; 3- pure water collection part; 31- first inlet; 32- second inlet; 33- water supply port; 4- hydrogen detection element; 5- pure water preparation system; 51- liquid inlet; 52- pure water outlet; 61- first liquid valve; 62- second liquid valve; 63- third liquid valve; 64- fourth liquid valve; 7- dehydrogenation device; 71- box; 711- top plate; 712- bottom plate; 721- spray pipe; 722- spray Outlet; 73-first impact surface; 731-first plate; 732-second plate; 74-second impact surface; 741-inclined section; 741a-top; 741b-bottom; 742-vertical section; 75-exhaust pipeline; 751-exhaust channel; 752-exhaust port; 761-liquid partition plate; 762-connecting plate; 77-overflow port; 78-liquid collecting chamber; 781-first liquid chamber; 782-second liquid chamber; 783-spacer; 784-liquid receiving side; 785-liquid discharge side; 79-air chamber; 791-first air channel; 792-second air channel. DETAILED DESCRIPTION

[0038] The present invention provides a water electrolysis hydrogen production system. By improving the system, at least one of online reduction of pure water conductivity by an oxygen-side gas-liquid separator 1 and recycling of wastewater from a hydrogen-side gas-liquid separator is achieved.

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0041] like Figure 1 and Figure 2 As shown, Figure 1 is a schematic structural diagram of a water electrolysis hydrogen production system according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a hydrogen removal device in an embodiment of the present invention.

[0042] As shown in the figure, the present invention provides a dehydrogenation device 7, which includes a box 71 and a spray pipe 721. The box 71 can be set at the top 741a of the pure water collection part 3 in the hydroelectric dehydrogenation system, or it can be set on the ground. No specific requirements are made here.

[0043] A liquid collecting chamber 78 is provided at the bottom of the box body 71, and an exhaust pipeline 75 is provided at the top. The exhaust pipeline 75 is provided with an exhaust channel 751. The exhaust channel 751 penetrates the top plate 711 of the box body 71 to form an exhaust port 752. Hydrogen volatilized from the liquid collecting chamber 78 can be discharged to the outside through the exhaust port 752.

[0044] A receiving space is formed between the liquid collecting chamber 78 and the top plate 711 of the box body 71, and a spraying end 722 is provided in the receiving space, and the spraying end 722 is connected to the hydrogen side liquid chamber. A spraying pipe 721 penetrates the box body 71 to form a water inlet of the dehydrogenation device 7, and the spraying pipe 721 is connected to the hydrogen side liquid chamber; the spraying pipe 721 has a spraying end 722, and the spraying end 722 is connected to a nozzle, and the nozzle is used to atomize the separation liquid and spray it outward.

[0045] Therefore, by providing the ejection end 722, the separation liquid in the hydrogen side liquid chamber can be atomized and ejected, thereby increasing the contact area between the separation liquid and the air, making it easier for hydrogen to volatilize from the separation liquid.

[0046] In an optional manner, a first impact surface 73 is further provided in the accommodation space, and the first impact surface 73 is opposite to the ejection end 722 in its ejection direction to form a stopper for the separation liquid ejected from the ejection end 722. The ejection direction of the ejection end 722 refers to the initial direction in which the fluid leaves the nozzle opening and diffuses outward when the nozzle ejects the liquid.

[0047] By arranging the impact surface to form a stopper for the separation liquid in the ejection direction, the separation liquid is ejected to the impact surface, thereby further increasing the rate of hydrogen precipitation in the separation liquid.

[0048] Specifically, the first impact surface 73 can be a plane or a folded surface. When the first impact surface 73 is a plane, it can be the top plate 711 of the box body 71; when it is a folded surface, an impact structure can also be provided on the top plate 711 of the box body 71, and the impact structure includes a first plate 731 and a second plate 732, one end of the first plate 731 and the second plate 732 are connected and fixed to the top plate 711 of the box body 71, and the other ends are separated, and the ejection end 722 is opposite to the end connected to the first plate 731 and the second plate 732 in the height direction; in addition, the impact structure can also be a conical structure, and the ejection end 722 is located at the center axis of the conical structure and is opposite to the small diameter end of the conical structure, wherein the center axis extends in the height direction, and the small diameter end is connected to the top plate 711 of the box body 71.

[0049] In other optional embodiments, a second impact surface 74 is further provided in the accommodating space, at least a portion of the second impact surface 74 is located at the lower side of the ejection end 722 in the height direction, and at least a portion of the second impact surface 74 and the side wall of the box body 71 are spaced apart so that the ejected separation liquid can fall into the liquid collecting chamber 78 under the action of its own gravity. In other words, the liquid collecting chamber 78 has a liquid receiving side 784, and the spacing is located at the liquid receiving side 784 of the liquid collecting chamber 78. It is defined that the separation liquid ejected from the ejection end 722 falls in the height direction to form a fall-back range, and the fall-back range is at least partially located on the second impact surface 74. Among them, the fall-back range refers to the area covered by the separation liquid after the separation liquid is ejected from the nozzle and the liquid flies a distance in the space to its highest point, and the liquid begins to fall or deviates from the original ejection direction due to gravity, air resistance or other external factors. This range can be a fan-shaped area, a circular area or other shapes, which are not specifically limited here.

[0050] In this embodiment, the falling range is entirely located on the second impact surface 74, or partially located on the second impact surface 74. Thus, the separation liquid can form a secondary impact with the second impact surface 74 during the falling process, so as to facilitate further precipitation of hydrogen in the separation liquid.

[0051] In a specific example, the second impact surface 74 has a sloped section 741, and the sloped section 741 is inclined from the side away from the liquid collecting chamber 78 to the side close to the liquid collecting chamber 78 in the height direction. Therefore, the sloped section 741 plays a role of guiding, which can reduce the height of the separation liquid entering the liquid collecting chamber 78 and reduce the disturbance of the separation liquid on the separation liquid in the liquid collecting chamber 78. Therefore, in the height direction, the sloped section 741 has a top end 741a and a bottom end 741b. In an example, the bottom end 741b and the top end 741a both form a gap with the side wall of the box body 71 on the corresponding side. The gap set at the bottom end 741b provides a channel for the falling separation liquid to enter the liquid collecting chamber 78, and the gap set at the top end 741a is used to provide a channel for the hydrogen in the gas cavity 79 under the sloped section 741 to be discharged.

[0052] That is to say, the second impact surface 74 divides the air cavity 79 into a first air duct 791 and a second air duct 792. The first air duct 791 and the second air duct 792 are distributed along the height direction. The liquid surface of the separation liquid in the liquid collecting cavity 78 constitutes a partial wall portion of the second air duct 792. The first air duct 791 is connected with at least one end of the second air duct 792. When the first air duct 791 is connected with one end of the second air duct 792, the position where the two are connected is located in the gap formed by the bottom end 741b and the side wall of the box body 71, and the gap formed by the top and the box body 71 is connected to a part of the exhaust port 752.

[0053] Optionally, the top end 741a extends along the vertical direction toward the side close to the top plate 711 to the vertical section 742 fixedly connected to the top plate 711, and the vertical section 742 may also be close to the top plate 711 but not connected to the top plate 711. In this way, the vertical section 742 is provided with a discharge end 722 on one side in the horizontal direction, and the space on the other side is separated from the discharge end 722, thereby avoiding the situation where the airflow disturbance in the airway where the discharge end 722 is located is large and interferes with the space on the other side of the vertical section 742, and facilitates the overflow of hydrogen in the two airways.

[0054] Optionally, the side wall of the box body 71 is provided with an overflow port 77, which is located above the liquid surface of the liquid collecting chamber 78; in the horizontal direction, the overflow port 77 is located on the side of the inclined surface section 741 away from the liquid collecting chamber 78. Therefore, the overflow port 77 is located away from the position where the separation liquid enters the liquid collecting chamber 78. After the separation liquid enters the liquid collecting chamber 78, hydrogen will further precipitate during its circulation. The overflow port 77 is arranged on the side away from the liquid inlet side of the liquid collecting chamber 78, which can ensure that the separation liquid overflowing through the overflow port 77 has sufficient time for hydrogen precipitation.

[0055] In the above-mentioned embodiment, at least one liquid partition plate 761 is further provided, part of which is located in the liquid collecting chamber 78 and is spaced from the bottom plate 712 of the box body 71 to form a spacer 783; part of which is located outside the liquid collecting chamber 78; the liquid partition plate 761 has a first surface and a second surface, and the first surface and the second surface extend along the height direction; the first surface and part of the side wall of the box body 71 define a first liquid chamber 781, and the second surface and another part of the side wall of the box body 71 define a second liquid chamber 782; the first liquid chamber 781 is connected to the second liquid chamber 782 through the spacer 783; the liquid collecting chamber 78 is defined to have a liquid receiving side 784 and a liquid discharge side 785, the liquid receiving side 784 is the side where the bottom end 741b of the inclined section 741 is located, and the liquid discharge side 785 is the side where the overflow port 77 is located; at least one of the first liquid chamber 781 and the second liquid chamber 782 is located on the liquid receiving side 784, and the other is located on the liquid discharge side 785. By providing the liquid partition plate 761, the separation liquid in the liquid collecting chamber 78 can be guided, and the flow path of the separation liquid in the liquid collecting chamber 78 can be further extended, giving the hydrogen more time to volatilize.

[0056] In this embodiment, the two side walls of the second impact surface 74 in the horizontal direction are fixedly connected to the side walls of the corresponding sides of the box body 71, and the side panels of the corresponding sides are defined as the first side panel and the second side panel;

[0057] The first side plate and the second side plate are also fixedly connected to the horizontally corresponding side walls of the liquid isolation plate 761. The first liquid cavity 781 and the second liquid cavity 782 both extend in the vertical direction, and the partition 783 extends in the horizontal direction, thereby forming an approximately U-shaped flow channel structure.

[0058] In the example shown in the figure, the liquid receiving side 784 is located in the first liquid chamber 781, and the liquid discharge side 785 is located in the second liquid chamber 782. The horizontal size of the first liquid chamber 781 is larger than the horizontal size of the second liquid chamber 782, thereby increasing the volatilization space of hydrogen in the first liquid chamber 781.

[0059] Optionally, one end of the flow partition located outside the liquid collecting chamber 78 is also connected to a connecting plate 762. The connecting plate 762 is set at an angle to the flow partition and is fixedly connected to the side wall of the box body 71 to form a relatively sealed space with the flow partition. Part of the space is located in the second air channel 792, and part of it is the second liquid chamber 782. In this way, the liquid surface in the second liquid chamber 782 can be prevented from contacting the rest of the air chamber 79, thereby ensuring that the separation liquid overflowing from the second liquid chamber 782 is not affected by the rest of the substances in the air chamber 79.

[0060] The present application also provides a water electrolysis hydrogen production system, and the specific structure of the water electrolysis hydrogen production system is described below through two embodiments. The technical solution of the present invention may include the technical solution of embodiment 1, the technical solution of embodiment 2, or both the technical solutions of embodiment 1 and embodiment 2.

[0061] Embodiment 1

[0062] The water electrolysis hydrogen production system includes an oxygen side gas-liquid separator 1, a pure water collection part 3 and a pure water preparation system 5. The pure water preparation system 5 is used to prepare pure water. The improvement of the present invention does not lie in the pure water preparation system 5, so the specific composition of the pure water preparation system 5 will not be described in detail.

[0063] The pure water preparation system 5 includes a liquid inlet 51 arranged at the head end of the pure water preparation system 5 and a pure water outlet 52 arranged at the tail end. The liquid to be purified enters the pure water preparation system 5 from the liquid inlet 51 and is purified to form pure water, which is discharged from the pure water outlet 52. The pure water collection part 3 includes a first inlet 31 and a water supply port 33, and the pure water outlet 52 is connected to the first inlet 31. The pure water collection part 3 is also a box-type structure, and an overflow port is also arranged on the top thereof, and the volatilized gas in the pure water in the box-type structure can automatically overflow from the overflow port.

[0064] The oxygen-side gas-liquid separator 1 has an oxygen-side liquid chamber therein, the water outlet of the oxygen-side liquid chamber can be connected or disconnected with the liquid inlet 51 , and the water inlet of the oxygen-side liquid chamber can be connected or disconnected with the water supply port 33 .

[0065] In a specific example, the water electrolysis hydrogen production system also includes a controller; the water outlet of the oxygen side liquid chamber is connected to the liquid inlet 51 through the waste liquid discharge pipeline 11, and the waste liquid discharge pipeline 11 is provided with a third liquid valve 63; the water supply port 33 is connected to the oxygen side liquid chamber through the liquid supply pipeline 12, and the liquid supply pipeline 12 is provided with a fourth liquid valve 64; the water electrolysis hydrogen production system also includes a conductivity meter, which is used to measure the conductivity of the separation liquid in the oxygen side liquid chamber; the controller is respectively connected to the conductivity meter, the third liquid valve 63 and the fourth liquid valve 64. Thus, the conductivity meter is used to monitor the conductivity of the separation liquid in the oxygen side liquid chamber in real time, so as to select the opening and closing operations of the third liquid valve 63 and the fourth liquid valve 64 according to the conductivity, so as to ensure that the conductivity of the separation liquid in the oxygen side liquid chamber is always within the set range.

[0066] During actual use, the conductivity meter detects the conductivity of the separation liquid in the oxygen side liquid chamber. The controller obtains the information collected by the conductivity meter and compares it with the set conductivity setting range. When the actual conductivity of the separation liquid is greater than the set range, the controller controls the opening of the third liquid valve 63 to discharge the separation liquid in the oxygen liquid chamber to the pure water purification system to participate in purification. After purification, this part of water will be collected in the pure water collection part 3 for subsequent use. At the same time, the controller also controls the opening of the fourth liquid valve 64 to supply pure water to the oxygen side liquid chamber, thereby reducing the overall conductivity of the separation liquid in the oxygen side liquid chamber until the actual conductivity meets the set range. The controller controls the closing of the third liquid valve 63 and the fourth liquid valve 64.

[0067] The conductivity meter may be a precision conductivity meter, such as an industrial-grade conductivity meter such as METTLER TOLEDO Thornton770MAX; a pointer conductivity meter or a digital conductivity meter may also be used, and technicians in this field may choose one according to their needs.

[0068] In this way, the conductivity of the separated liquid in the oxygen side liquid chamber of the oxygen side gas-liquid separator 1 is reduced online, which improves the working efficiency of the water electrolysis hydrogen production system and reduces the complexity and cost of the subsequent processing process; at the same time, the separated liquid in the oxygen side liquid chamber is collected to the pure water preparation system 5 through the liquid inlet 51, thereby realizing repeated recycling and reducing the energy consumption of the water electrolysis hydrogen production system.

[0069] Optionally, the flow rate per unit time of the waste liquid discharge pipeline 11 and the liquid supply pipeline 12 is kept consistent, and the flow rate per unit time can be designed by combining the diameter and length of the waste liquid discharge pipeline 11 and the liquid supply pipeline 12. Thus, the discharge amount and the supply amount of the separation liquid in the oxygen side liquid chamber can be kept constant by controlling the opening and closing states of the third liquid valve 63 and the fourth liquid valve 64 to be consistent.

[0070] Embodiment 2

[0071] The water electrolysis hydrogen production system includes a hydrogen side gas-liquid separator 2, and the water electrolysis hydrogen production system also includes the above-mentioned dehydrogenation device 7. The pure water collecting part 3 includes a second inlet 32. The hydrogen side gas-liquid separator 2 has a hydrogen side liquid chamber, and the water outlet of the hydrogen side liquid chamber is connected to the water inlet of the dehydrogenation device 7. The water outlet of the dehydrogenation device 7 can be connected or disconnected with the second inlet 32.

[0072] By setting up a dehydrogenation device 7, the separation liquid in the hydrogen side liquid chamber is dehydrogenated to reduce the hydrogen content of the separation liquid in the hydrogen side gas-liquid separator 2, and the separation liquid after dehydrogenation is connected to the pure water collection part 3; on the one hand, the emission of the hydrogen side gas-liquid separator 2 is reduced, and on the other hand, the separation liquid after dehydrogenation is reused to save energy.

[0073] Specifically, the dehydrogenation device 7 includes a liquid discharge pipeline 21 and a liquid discharge sub-pipe 22, and the liquid discharge pipeline 21 and the liquid discharge sub-pipe 22 are connected. A first liquid valve 61 is provided on the liquid discharge pipeline 21 to control the connection or disconnection state of the liquid discharge pipeline 21 with the outside; the position where the liquid discharge sub-pipe 22 is connected to the liquid discharge pipeline 21 is located between the water outlet of the dehydrogenation device 7 and the first liquid valve 61; the other end of the liquid discharge sub-pipe 22 can be connected or disconnected with the second inlet 32, and the liquid discharge sub-pipe 22 is also provided with a second liquid valve 62, and the connection or disconnection state of the liquid discharge sub-pipe 22 is controlled by controlling the second liquid valve 62. The water electrolysis hydrogen production system also includes a hydrogen detection component 4, which is used to detect the hydrogen concentration of the pure water collection part 3, and the controller, the hydrogen detection component 4, the first liquid valve 61 and the second liquid valve 62 are signal-connected.

[0074] By setting a hydrogen detection component 4 to monitor the hydrogen content in the pure water collection part 3, the controller selects to open the first liquid valve 61 or the second liquid valve 62 according to the hydrogen content in the pure water collection part 3, so as to discharge the separation liquid in the hydrogen side liquid chamber or collect the separation liquid in the hydrogen side liquid chamber into the pure water collection part 3; thus, an error correction process is designed for the water electrolysis hydrogen production system to ensure that when the hydrogen removal device 7 fails, the separation liquid containing hydrogen can be prevented from being mistakenly discharged into the pure water collection part 3 in time, thereby ensuring the safety of the system and the purity of the pure water. Among them, the hydrogen detection component 4 can adopt a gas sensor with electrochemical, thermal conduction and semiconductor detection principles, etc., and those skilled in the art can choose by themselves.

[0075] In actual use, the hydrogen detection element 4 detects the hydrogen concentration in the pure water collection part 3. After the controller obtains the information, it compares the actual hydrogen concentration in the pure water collection part 3 with the set threshold range. If the actual hydrogen concentration is greater than the set threshold range, the controller determines that the dehydrogenation device 7 has a fault and sends an alarm to remind the staff to perform maintenance. At the same time, the controller controls the first liquid valve 61 to open to discharge the separation liquid in the dehydrogenation device 7; and at the same time closes the second liquid valve 62, thereby closing the passage of the separation liquid in the hydrogen device into the pure water collection part 3 to ensure the safe operation of the entire water electrolysis hydrogen production system.

[0076] Optionally, the opening and closing states of the first liquid valve 61 and the second liquid valve 62 are mutually exclusive. In this way, when it is detected that the hydrogen content in the pure water collecting part 3 exceeds the standard, the first liquid valve 61 is opened and the second liquid valve 62 is closed to discharge the separation liquid to avoid contaminating the pure water in the pure water collecting part 3; after the dehydrogenation device 7 is repaired, the first liquid valve 61 is closed and the second liquid valve 62 is opened to recover the separation liquid in the hydrogen-side gas-liquid separator 2 again.

[0077] In the above two embodiments, the water electrolysis hydrogen production system includes an oxygen side gas-liquid separator 1, a hydrogen side gas-liquid separator 2, a pure water collecting part 3 and a pure water preparation system 5. The pure water preparation system 5 is used to prepare pure water, including a liquid inlet 51 arranged at the head end of the pure water preparation system 5 and a pure water outlet 52 arranged at the tail end. The pure water collecting part 3 includes a first inlet 31 and a water supply port 33, and the pure water outlet 52 is connected to the first inlet 31; wherein, the oxygen side gas-liquid separator 1 has an oxygen side liquid cavity, the water outlet of the oxygen side liquid cavity can be connected or disconnected with the liquid inlet 51, and the water inlet of the oxygen side liquid cavity can be connected or disconnected with the water supply port 33; the water electrolysis hydrogen production system also includes a dehydrogenation device 7, the pure water collecting part 3 includes a second inlet 32, the hydrogen side gas-liquid separator 2 has a hydrogen side liquid cavity, the water outlet of the hydrogen side liquid cavity is connected with the water inlet of the dehydrogenation device 7, and the water outlet of the dehydrogenation device 7 can be connected or disconnected with the second inlet 32. In this way, the conductivity of the separation liquid in the oxygen side liquid chamber of the oxygen side gas-liquid separator 1 is reduced online, and the emission of the hydrogen side gas-liquid separator 2 is also reduced; at the same time, the separation liquids in the oxygen side gas-liquid separator 1 and the hydrogen side gas-liquid separator 2 are connected to different positions in the pure water preparation system 5 according to their different characteristics, thereby realizing the reuse of the separation liquid, reducing the supply of external pure water, reducing the loss of the pure water preparation system 5, and significantly improving the pure water preparation efficiency.

[0078] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that: The invention comprises an oxygen-side gas-liquid separator (1), a hydrogen-side gas-liquid separator (2), a pure water preparation system (5), and a pure water collection part (3); the pure water collection part (3) comprises a first inlet (31) and a water supply port (33); the pure water preparation system (5) is used to prepare pure water, and comprises a liquid inlet (51) arranged at the head end, and a pure water outlet (52) arranged at the tail end; the pure water outlet (52) is connected to the first inlet (31); wherein, The oxygen-side gas-liquid separator (1) has an oxygen-side liquid chamber, the water outlet of the oxygen-side liquid chamber can be connected or disconnected with the liquid inlet (51), and the water inlet of the oxygen-side liquid chamber can be connected or disconnected with the water supply port (33); and / or, The water electrolysis hydrogen production system further comprises a dehydrogenation device (7), the pure water collection portion (3) comprises a second inlet (32), the hydrogen side gas-liquid separator (2) comprises a hydrogen side liquid chamber, the water outlet of the hydrogen side liquid chamber is connected to the water inlet of the dehydrogenation device (7), and the water outlet of the dehydrogenation device (7) can be connected or disconnected to the second inlet (32).

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: The dehydrogenation device (7) comprises a liquid discharge pipeline (21) and a liquid discharge sub-pipe (22); a first liquid valve (61) is arranged on the liquid discharge pipeline (21); and a position where the liquid discharge sub-pipe (22) communicates with the liquid discharge pipeline (21) is located between a water outlet of the dehydrogenation device (7) and the first liquid valve (61); The other end of the liquid discharge sub-pipe (22) is in communication with the second inlet (32), and the liquid discharge sub-pipe (22) is further provided with a second liquid valve (62); The water electrolysis hydrogen production system further comprises a controller and a hydrogen detection element (4), wherein the hydrogen detection element (4) is used to detect the hydrogen concentration of the pure water collection part (3), and the controller, the hydrogen detection element (4), the first liquid valve (61) and the second liquid valve (62) are in signal communication.

3. The water electrolysis hydrogen production system according to claim 2, characterized in that: The open and closed states of the first liquid valve (61) and the second liquid valve (62) are mutually exclusive.

4. The water electrolysis hydrogen production system according to claim 2, characterized in that: The water outlet of the oxygen-side liquid chamber is connected to the liquid inlet (51) via a waste liquid discharge pipeline (11), and the waste liquid discharge pipeline (11) is provided with a third liquid valve (63); the water supply port (33) is connected to the oxygen-side liquid chamber via a liquid supply pipeline (12), and the liquid supply pipeline (12) is provided with a fourth liquid valve (64); The water electrolysis hydrogen production system also includes a conductivity meter, which is used to measure the conductivity of the liquid in the oxygen side liquid chamber; The controller is in signal communication with the conductivity meter, the third liquid valve (63) and the fourth liquid valve (64) respectively.

5. The water electrolysis hydrogen production system according to claim 4, characterized in that: The flow rate per unit time of the waste liquid discharge pipeline (11) and the liquid supply pipeline (12) is consistent.

6. The water electrolysis hydrogen production system according to any one of claims 1 to 5, characterized in that: The dehydrogenation device (7) comprises a box body (71), a liquid collecting chamber (78) is provided at the bottom of the box body (71), a receiving space is formed between the liquid collecting chamber (78) and a top plate (711) of the box body (71), a spraying end (722) is provided in the receiving space, and the spraying end (722) can be connected or disconnected with the hydrogen side liquid chamber.

7. The water electrolysis hydrogen production system according to claim 6, characterized in that: A first impact surface (73) is also provided in the accommodating space, and the first impact surface (73) is opposite to the ejection end (722) in its ejection direction so as to form a stop for the separation liquid ejected from the ejection end (722).

8. The water electrolysis hydrogen production system according to claim 7, characterized in that: A second impact surface (74) is also provided in the accommodating space, and at least a portion of the second impact surface (74) is located below the ejection end (722) in the height direction, and the second impact surface (74) is spaced apart from a portion of the side wall of the box body (71); It is defined that the separation liquid sprayed from the spraying end (722) falls in the height direction to form a falling range, and the falling range is at least partially located on the second impact surface (74).

9. The water electrolysis hydrogen production system according to claim 8, characterized in that: The second impact surface (74) has an inclined surface section (741), and the inclined surface section (741) is inclined in the height direction from a side away from the liquid collecting chamber (78) toward a side close to the liquid collecting chamber (78).

10. The water electrolysis hydrogen production system according to claim 9, characterized in that: The side wall of the box body (71) is provided with an overflow port (77), and the overflow port (77) is located above the liquid level of the liquid collecting chamber (78).

11. The water electrolysis hydrogen production system according to claim 10, characterized in that: A liquid partition plate (761) is also provided, wherein a portion of the liquid partition plate (761) is located in the liquid collecting chamber (78), and a partition portion (783) is provided between the liquid partition plate and the bottom plate (712) of the box body (71), and a portion of the liquid partition plate (761) is located outside the liquid collecting chamber (78); The liquid isolation plate (761) has a first surface and a second surface, the first surface and the second surface extend in a height direction; the first surface and a part of the side wall of the box body (71) define a first liquid cavity (781), and the second surface and another part of the side wall of the box body (71) define a second liquid cavity (782); the first liquid cavity (781) and the second liquid cavity (782) are connected via the spacer (783); The liquid collecting chamber (78) is defined as having a liquid receiving side (784) and a liquid discharging side (785); the liquid receiving side (784) is the side where the bottom end (741b) of the inclined surface section (741) is located, and the liquid discharging side (785) is the side where the overflow port (77) is located; at least one of the first liquid chamber (781) and the second liquid chamber (782) is located on the liquid receiving side (784), and the other is located on the liquid discharging side (785).

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