Seawater desalination hydrogen production device and seawater desalination hydrogen production technological process

Abstract

The invention discloses a seawater desalination hydrogen production device which comprises a base with a closed bottom and an axially-through shell barrel, seawater through holes are formed in the side wall of the base, and the shell barrel is fixed to the top of the base; the pneumatic lifting mechanism comprises an air-closed pneumatic head, a pneumatic head bracket and a connecting bracket which are sequentially connected from top to bottom, and a connecting rod of which one end is connected with the output end of the pneumatic head and the other end is fixed at the top of the filter cartridge; the side wall of the filter cartridge is coated with a selective permeable membrane, a plurality of filter holes are formed in the filter cartridge, and a water inlet and a water outlet are formed in the bottom of the filter cartridge; the water inlet pipe connected with the water inlet and the water outlet pipe connected with the water outlet are used for forming an alkali liquor circulation path; the air-closed pneumatic head is controlled to drive the filter cartridge to lift so as to adjust the osmotic pressure difference, so that seawater desalination and alkali liquor concentration dynamic balance are realized. The device can automatically ascend and descend according to the liquid level height in the filter cartridge, and the proportion of alkali liquor to pure water in the filter cartridge is regulated and controlled.

Description

Technical Field

[0001] The present application relates to the technical field of seawater desalination hydrogen production, specifically a seawater desalination hydrogen production device and a seawater desalination hydrogen production process. Background Art

[0002] With the continuous growth of global energy demand and the increasing emphasis on environmental protection, the development of clean and efficient energy has become a top priority. Hydrogen, as a clean energy carrier, has the advantages of high energy density and pollution-free combustion products. It has broad application prospects in many fields, such as fuel cell vehicles, distributed power generation, and chemical production.

[0003] Currently, the main methods for producing hydrogen include fossil fuel reforming and water electrolysis. Among them, water electrolysis has attracted much attention due to its advantages such as high product purity and pollution-free operation. However, traditional water electrolysis typically uses freshwater, and freshwater resources are unevenly distributed and increasingly scarce around the world, which limits the large-scale application of water electrolysis for hydrogen production. Desalination of seawater offers a new approach to solving this problem. With abundant seawater resources, effectively utilizing seawater for hydrogen production would greatly expand the scope for the development of the hydrogen production industry.

[0004] In the field of seawater desalination and hydrogen production, existing technical solutions have some limitations. On the one hand, some devices have complex structures and high costs, making it difficult to achieve large-scale industrial production. For example, some systems require multi-stage pretreatment equipment to remove impurities in seawater. These devices not only increase investment costs but also increase the energy consumption of the system. On the other hand, the control of the liquid level in the filter cartridge is not precise enough, and the ratio of alkaline solution to pure water cannot be effectively maintained, which in turn affects the efficiency and stability of subsequent electrolytic hydrogen production. When the liquid level in the filter cartridge cannot be accurately adjusted, it may cause uneven mixing of seawater and alkaline solution, affecting the progress of the electrolysis reaction, reducing hydrogen production and quality, and even causing equipment failure or safety hazards due to imbalance in proportion. Summary of the Invention

[0005] The present application provides a seawater desalination hydrogen production device and a seawater desalination hydrogen production process, which can automatically rise and fall according to the liquid level height in the filter cartridge. When the liquid level reaches the set value, the sealing plate and the sealing gasket are in close contact, blocking the seawater from entering the filter cartridge, accurately controlling the ratio of alkaline solution to pure water, ensuring the stability of the mixed liquid composition, providing ideal conditions for the electrolysis reaction, and improving the electrolysis efficiency and hydrogen purity.

[0006] The technical solution adopted by the present application to solve the technical problem is: a seawater desalination hydrogen production device, comprising:

[0007] The bottom of the base is closed and the outer shell is axially penetrated. The side wall of the base is provided with a seawater through hole. The outer shell is fixed to the top of the base.

[0008] Pneumatic lifting mechanism: It includes an air-closed pneumatic head, a pneumatic head bracket and a connecting bracket connected in sequence from top to bottom, and a connecting rod with one end connected to the output end of the pneumatic head and the other end fixed to the top of the filter cartridge;

[0009] The filter cartridge is arranged inside the outer shell body, the side wall of which is covered with a selective permeable membrane and has a plurality of filter holes, and the bottom is provided with a water inlet and a water outlet;

[0010] The water inlet pipe connected to the water inlet and the water outlet pipe connected to the water outlet are used to form an alkali solution circulation path; by controlling the air-closed pneumatic head to drive the filter cartridge up and down to adjust the osmotic pressure difference, a dynamic balance between seawater desalination and alkali solution concentration is achieved.

[0011] Furthermore, a base flange is provided on the upper portion of the side wall of the base, and a shell cylinder flange is fixed to the bottom side wall of the shell cylinder, and the base flange and the shell cylinder flange are threadedly connected via a first stud;

[0012] The sealing plate is fixed to the bottom of the filter cartridge and is provided with through holes corresponding to the water inlet and outlet of the filter cartridge.

[0013] Furthermore, an upper cover flange is provided at the bottom of the connecting bracket, a flange is fixed to the upper side wall of the outer shell cylinder, and the upper cover flange and the flange are threadedly connected via a second stud.

[0014] Furthermore, sealing gaskets are filled between the upper cover flange and the flange sheet and between the base flange and the outer shell cylinder flange;

[0015] An annular protrusion is provided on the upper part of the filter cartridge and the upper part of the sealing plate for abutting against the sealing gasket to achieve a sealing effect.

[0016] Furthermore, it also includes a circular flange;

[0017] A cylinder with a diameter larger than that of the connecting rod is fixed to the end of the connecting rod, and the cylinder is embedded in a circular flange on the top of the filter cartridge;

[0018] A stepped hole is provided at the center of the circular flange, including a first section hole for accommodating a connecting rod and a second section hole for limiting a cylinder, and a plurality of connecting screw holes are evenly distributed around the circumference of the circular flange.

[0019] Furthermore, a liquid level sensor is provided in the filter cartridge, and the liquid level sensor is electrically connected to the air-closed pneumatic head, and is used to control the opening and closing of the pneumatic head according to the liquid level height in the filter cartridge.

[0020] Furthermore, the diameter of the outer shell is larger than the diameter of the filter cartridge; an infiltration cavity is formed between the outer shell and the filter cartridge, and the infiltration cavity is connected to the external seawater through the through hole on the side wall of the base.

[0021] Furthermore, the guide mechanism includes a guide portion fixed to the outer wall of the filter cartridge and a guide rod installed on the inner wall of the shell cylinder. The guide portion is sleeved on the guide rod to limit the moving path of the filter cartridge.

[0022] Furthermore, the present application also provides a process for producing hydrogen from seawater desalination, comprising:

[0023] S1: Alkali solution circulation supply, the alkali solution external pipe and the alkali solution filter are synchronously connected through the water inlet pipe. The alkali solution external pipe is used to inject the initial alkali solution into the filter cartridge, and the alkali solution filter is used to inject the filtered circulating alkali solution back into the filter cartridge, forming a closed-loop alkali solution supply system;

[0024] S2: Seawater penetrates into the filter cartridge through the selective permeation membrane and mixes with the alkali solution. The mixed solution is pumped through the outlet pipe to the alkali solution filter to separate pure water and circulating alkali solution;

[0025] S3: The circulating alkali solution is purified by the alkali filter and then flows back to the filter cartridge through the water inlet pipe. The pure water is transported to the electrolytic cell for electrolysis to produce hydrogen. The electrolysis reaction is carried out in the alkaline electrolyte environment to generate hydrogen and oxygen.

[0026] S4: The hydrogen and oxygen generated by electrolysis are respectively introduced into the hydrogen separator and oxygen separator, and are dehydrated and dried in the hydrogen-water separator and oxygen-water separator before being output.

[0027] Furthermore, after S3 stops electrolysis, it also includes:

[0028] a) continuously introducing nitrogen into the hydrogen separator and oxygen separator through the nitrogen injection pipeline for gas replacement;

[0029] b) During the replacement process, the internal pressure of the hydrogen separator and oxygen separator is monitored by a pressure transmitter;

[0030] c) When the pressure reaches a predetermined high-pressure threshold, close the nitrogen inlet valve and open the manual pressure relief valve to reduce the pressure to a predetermined low-pressure threshold;

[0031] d) repeating steps ac at least three times to complete the gas replacement cycle;

[0032] e) After the replacement is completed, the inside of the separator is maintained at normal pressure.

[0033] The beneficial effects of this application are:

[0034] (1) The seawater desalination hydrogen production device of the present application can automatically rise and fall according to the liquid level height in the filter cartridge. When the liquid level reaches the set value, the sealing plate and the sealing gasket are in close contact, blocking the seawater from entering the filter cartridge, accurately controlling the ratio of alkaline solution and pure water, ensuring the stability of the mixed liquid composition, providing ideal conditions for the electrolysis reaction, and improving the electrolysis efficiency and hydrogen purity.

[0035] (2) The flange connection between the base and the outer shell, and the flange connection between the connecting bracket and the outer shell, combined with the sealing gasket, enhances the overall sealing and stability of the device, prevents liquid leakage, and ensures reliable operation.

[0036] (3) The outer wall guide portion of the filter cartridge of the present application cooperates with the inner guide rod of the outer shell cylinder to limit the movement path of the filter cartridge, prevent the filter cartridge from tilting or getting stuck, ensure that the pneumatic head drives the filter cartridge to rise and fall smoothly, and improve the operating stability of the device.

[0037] (4) The present invention forms an infiltration cavity between the outer shell and the filter cartridge, which is connected to the external seawater through the through-hole in the base. This cavity utilizes the natural infiltration of seawater, eliminating the need for additional power, simplifying the process, and reducing energy consumption and costs. The alkali liquid circulation system re-injects the filtered circulating alkali liquid into the filter cartridge, reducing alkali liquid consumption, lowering operating costs, and preventing environmental pollution caused by alkali liquid discharge.

[0038] (5) After electrolysis stops, the hydrogen production process of this application replaces the gas in the separator with nitrogen. A pressure transmitter monitors the pressure in real time and automatically releases the pressure when overpressure occurs, ensuring the safety of equipment and personnel. The modular design of the device components facilitates installation, disassembly, and maintenance, shortening maintenance time and improving equipment utilization.

[0039] (6) This application combines seawater desalination with hydrogen production to form a complete process from seawater extraction to hydrogen output, improving system integration and operational efficiency, and providing a technical solution for large-scale seawater desalination hydrogen production. It is suitable for distributed hydrogen production in coastal areas, supplying hydrogen for fuel cells, chemical industries, etc., reducing the cost and risk of long-distance hydrogen transportation, and promoting the development of the hydrogen energy industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of a seawater desalination hydrogen production device according to Example 1;

[0041] Figure 2 This is a partial enlarged view of location A of a seawater desalination hydrogen production device in Example 1;

[0042] Figure 3 This is a partial enlarged view of position B of a seawater desalination hydrogen production device in Example 1;

[0043] Figure 4 This is a structural schematic diagram of a filter cartridge for a seawater desalination hydrogen production device according to Example 1;

[0044] Figure 5 This is a structural schematic diagram of a circular flange of a filter cartridge for a seawater desalination hydrogen production device according to Example 1;

[0045] Figure 6 This is a structural schematic diagram of a filter cartridge guide rod of a seawater desalination hydrogen production device according to Example 1;

[0046] Figure 7This is a schematic diagram of a process flow for producing hydrogen from seawater desalination according to Example 2;

[0047] In the figure: 1. Base; 2. Through hole; 3. Outer shell; 4. Connecting bracket; 5. Pneumatic head bracket; 6. Air-closed pneumatic head; 7. Connecting rod; 8. Filter cartridge; 9. Water inlet; 10. Water outlet; 11. Filter hole; 12. Selective permeability membrane; 13. Water inlet pipe; 14. Water outlet pipe; 15. Base flange; 16. Outer shell flange; 17. First stud; 18. Sealing plate; 19. Through hole; 20. Upper cover flange; 21. Flange; 22. Second stud; 23. Sealing gasket; 24. Circular flange; 25. Cylinder; 26. Step hole; 27. First section hole; 28. Second section hole; 29. Connecting screw hole; 30. Liquid level sensor; 31. Permeation cavity; 32. Guide part; 33. Guide rod; 34. Annular protrusion. DETAILED DESCRIPTION

[0048] In order to facilitate understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0049] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0050] Example 1:

[0051] The present application discloses a seawater desalination hydrogen production device, such as Figure 1 As shown, it includes a base 1, which is a cylinder with a closed bottom. The side wall of the base 1 is provided with a through hole 2; the base 1 is placed on a plane to ensure that its bottom is closed and the side wall through hole 2 is not blocked.

[0052] The outer shell 3 is axially through-hole and fixedly mounted on the top of the base 1. A base flange 15 is provided on the upper sidewall of the base 1, and a shell flange 16 is fixed to the bottom sidewall of the outer shell 3. The base flange 15 and shell flange 16 are threadedly connected via a first stud 17. A sealing plate 18 is fixed to the bottom of the filter cartridge 8 to ensure the seal of the bottom of the filter cartridge 8. The sealing plate 18 is provided with through-holes 19 corresponding to the filter cartridge water inlet 9 and outlet 10. An annular protrusion 34 is provided on the upper portion of the filter cartridge 8 and the upper portion of the sealing plate 18 for abutting with the sealing gasket 23 to achieve a sealing effect.

[0053] like Figure 1 and Figure 2 As shown, the outer shell cylinder 3 is fixedly installed on the top of the base 1, and is threadedly connected to the outer shell cylinder flange 16 through the base flange 15 using the first stud 17, and a sealing gasket 23 is filled between the two to ensure the sealing of the connection and prevent liquid leakage.

[0054] like Figure 1 and Figure 3 As shown, the connecting bracket 4 is fixedly mounted on the top of the outer shell 3. The bottom of the connecting bracket 4 is provided with an upper cover flange 20. A flange 21 is fixed to the upper side wall of the outer shell 3. The upper cover flange 20 and the flange 21 are threadedly connected via studs 22. A sealing gasket 23 is filled between the upper cover flange 20 and the flange 21.

[0055] The pneumatic head bracket 5 is fixedly mounted on the top of the connecting bracket 4; the air-closed pneumatic head 6 is fixedly mounted on the top of the pneumatic head bracket 5; a connecting rod 7 has one end connected to the output end of the air-closed pneumatic head 6 and the other end fixed to the top of the filter cartridge 8;

[0056] Furthermore, if Figure 1 and Figure 5 As shown, it also includes a circular flange 24; a cylinder 25 with a diameter larger than the connecting rod is fixed to the end of the connecting rod 7, and the cylinder 25 is embedded in the circular flange 24 on the top of the filter cartridge 8; a stepped hole 26 is provided in the center of the circular flange 24, including a first section hole 27 for accommodating the connecting rod 7 and a second section hole 28 for limiting the cylindrical body 25, and a plurality of connecting screw holes 29 are evenly distributed around the circumference of the circular flange 24.

[0057] The filter cartridge 8 is placed inside the outer shell 3, and the top of the filter cartridge 8 is connected to the output end of the air-closed pneumatic head 6 via the connecting rod 7. A cylinder 25 is fixed to the end of the connecting rod 7, which is embedded in the circular flange 24 on the top of the filter cartridge 8. The center of the circular flange 24 is provided with a stepped hole 26. The first section of the hole 27 is used to accommodate the connecting rod 7, and the second section of the hole 28 is used to limit the cylinder 25. The circular flange 24 is tightly connected to the top of the filter cartridge 8 through the connecting screw hole 29, ensuring that the linkage between the filter cartridge 8 and the air-closed pneumatic head 6 is stable and reliable.

[0058] like Figure 1 and Figure 4 As shown, the bottom of the filter cartridge 8 is provided with a water inlet 9 and a water outlet 10, and the top is linked to the air-closed pneumatic head 6 through a connecting rod 7; the side wall of the filter cartridge 8 is provided with a plurality of filter holes 11, and the side wall of the filter cartridge is covered with a selective permeable membrane 12; the water inlet pipe 13 and the water outlet pipe 14 are respectively connected to the water inlet 9 and the water outlet 10 of the filter cartridge 8.

[0059] Furthermore, a liquid level sensor 30 is provided in the filter cartridge 8, and the liquid level sensor 30 is electrically connected to the air-closed pneumatic head 6 to ensure that the liquid level sensor 30 can accurately detect the liquid level height in the filter cartridge 8 and transmit the signal to the air-closed pneumatic head 6 in a timely manner, thereby realizing precise control of the liquid level in the filter cartridge 8.

[0060] Furthermore, the diameter of the outer shell 3 is larger than the diameter of the filter cartridge 8 ; a permeation cavity 31 is formed between the outer shell 3 and the filter cartridge 8 , and the permeation cavity 31 is connected to the external seawater through the side wall through hole 2 of the base 1 .

[0061] Furthermore, it also includes: a guiding mechanism, including a guiding portion 32 fixed to the outer wall of the filter cartridge 8 and a guiding rod 33 installed on the inner wall of the outer shell cylinder 3, the guiding portion 32 is sleeved on the guide rod 33, and is used to limit the moving path of the filter cartridge 8 to ensure that the filter cartridge 8 runs smoothly during the lifting process without tilting or getting stuck.

[0062] The air-closed pneumatic head of the seawater desalination hydrogen production device of the present application automatically rises and falls according to the liquid level height in the filter cartridge, and can accurately control the ratio of alkali solution and pure water, ensuring the stability of the mixed liquid composition, providing ideal conditions for the electrolysis reaction, and effectively improving the electrolysis efficiency and hydrogen purity. When the liquid level reaches the set value, the sealing plate and the sealing gasket are in close contact, reliably blocking the seawater from entering the filter cartridge, ensuring the stability of the reaction environment in the filter cartridge, avoiding interference from impurities, and extending the service life of the equipment. In addition, the flange connection is combined with the sealing gasket to enhance the overall sealing and stability, prevent liquid leakage, and ensure reliable operation. The setting of the guide mechanism limits the movement path of the filter cartridge, ensuring that it rises and falls smoothly, avoiding tilting or jamming, and further improving operational stability. The design of the osmosis chamber is ingenious, utilizing the natural infiltration of seawater without the need for additional power, simplifying the process flow, and reducing energy consumption and costs.

[0063] Example 2:

[0064] like Figure 7 As shown, the present application also provides a process flow for producing hydrogen from seawater desalination, comprising:

[0065] S1: Alkali solution circulation supply, the alkali solution external pipe and the alkali solution filter are synchronously connected through the water inlet pipe. The alkali solution external pipe is used to inject the initial alkali solution into the filter cartridge, and the alkali solution filter is used to inject the filtered circulating alkali solution back into the filter cartridge, forming a closed-loop alkali solution supply system;

[0066] S2: Seawater penetrates into the filter cartridge through the selective permeation membrane and mixes with the alkali solution. The mixed solution is pumped through the outlet pipe to the alkali solution filter to separate pure water and circulating alkali solution;

[0067] Initial stage: alkali injection. After starting the device, initial alkali is injected into the filter cartridge 8 through the alkali external pipe connected to the water inlet pipe 13. Simultaneously, the alkali filter also injects the filtered circulating alkali back into the filter cartridge 8 through the water inlet pipe 13, forming a closed-loop alkali supply system. The initial alkali injection volume can be set according to the volume of the filter cartridge 8 and process requirements. Generally, it is injected to 1 / 3-1 / 2 of the volume of the filter cartridge 8 to leave sufficient space for seawater infiltration and mixing.

[0068] Liquid Level Monitoring and Pneumatic Head Control: Liquid level sensor 30 monitors the liquid level in filter cartridge 8 in real time and transmits a signal to air-closed pneumatic head 6. The pneumatic head adjusts its position based on the liquid level signal to maintain a set ratio of lye to pure water in filter cartridge 8, for example, a 3:2 volume ratio. This ensures the mixed solution has suitable electrolytic properties and provides favorable conditions for the subsequent electrolysis reaction.

[0069] Seawater infiltration: Seawater enters the permeation cavity 31 between the outer shell 3 and the filter cartridge 8 through the through-holes 2 in the sidewall of the base 1. Under the influence of a pressure differential, seawater penetrates the filter cartridge 8 through the selective permeation membrane 12 on the sidewall, mixing with the alkaline solution to form a mixed solution. The selective permeation membrane 12 effectively filters impurities and salt from the seawater, allowing only water molecules and a small amount of small molecules to pass through. This ensures that the seawater that has infiltrated the filter cartridge 8 mixes thoroughly with the alkaline solution, forming a mixed solution suitable for electrolysis.

[0070] Mixed liquor transportation and separation: The mixed liquor is pumped through outlet pipe 14 to the alkali liquor filter, where it is separated into pure water and circulating alkali liquor. The alkali liquor filter utilizes highly efficient filtration materials to remove impurities and salt from the mixed liquor. It also recovers the circulating alkali liquor, returning it to the filter cartridge 8 through inlet pipe 13, achieving alkali liquor recycling, reducing alkali liquor consumption, and lowering operating costs.

[0071] S3: After being purified by the alkali filter, the circulating alkali solution flows back through the water inlet pipe to the filter cartridge. The pure water is then transported to the electrolytic cell for hydrogen production. The electrolysis reaction occurs in an alkaline electrolyte environment, generating hydrogen and oxygen. Pure Water Transport and Electrolysis: The separated pure water is then transported to the electrolytic cell for an electrolysis reaction in an alkaline electrolyte environment, generating hydrogen and oxygen. The electrolytic cell utilizes advanced electrolysis technology and is equipped with high-efficiency electrode materials, enabling efficient electrolysis with low energy consumption. The hydrogen and oxygen generation rates can be adjusted based on the cell's power and the amount of pure water supplied.

[0072] S4: The hydrogen and oxygen produced by electrolysis are fed into a hydrogen separator and oxygen separator, respectively, where they are dehydrated and dried before being output. Gas Separation and Drying: The hydrogen and oxygen produced by electrolysis are fed into a hydrogen separator and oxygen separator, respectively, where they are dehydrated and dried before being output, yielding high-purity hydrogen and oxygen. The gas separator and dryer utilize highly efficient separation and drying technologies to effectively remove moisture and impurities from the gas, ensuring the output hydrogen and oxygen have a purity exceeding 99.99%, meeting the requirements of subsequent applications.

[0073] Furthermore, after stopping the electrolysis, nitrogen is continuously introduced into the hydrogen separator and the oxygen separator through the nitrogen injection pipeline for gas replacement; during the replacement process, the internal pressure of the hydrogen separator and the oxygen separator is monitored by a pressure transmitter. When it is detected that the pressure exceeds the set threshold, the pneumatic pressure relief valve connected to the separator is triggered to open and release the pressure until the pressure is less than or equal to the set threshold and the valve is closed. This is repeated at least three times to complete the gas replacement cycle; after the replacement is completed, the internal pressure of the separator is maintained at normal pressure.

[0074] Gas replacement and pressure monitoring: During the electrolysis process, if electrolysis needs to be stopped, nitrogen is continuously introduced into the hydrogen separator and oxygen separator through the nitrogen injection pipeline for gas replacement. During the replacement process, the pressure transmitter monitors the internal pressure of the separator in real time. When the pressure exceeds the preset high-pressure threshold, such as 0.8-1.2MPa, the nitrogen inlet valve is closed and the manual pressure relief valve is opened to reduce the pressure to the predetermined low-pressure threshold. Repeat these steps three or more times to complete the gas replacement cycle. After the replacement is completed, the internal pressure of the separator is maintained at normal pressure to ensure the safe operation of the entire device and prevent equipment damage or safety accidents caused by excessive pressure.

[0075] Stopping Operation: After electrolysis is stopped, close the valves on the water inlet pipe 13 and the water outlet pipe 14 to stop the flow of alkali solution and seawater. Adjust the air-tight pneumatic head 6 to its initial position to restore the liquid level in the filter cartridge 8 to its initial state. Finally, disconnect the power supply to the device, completing the entire seawater desalination hydrogen production process.

[0076] The seawater desalination hydrogen production process of this application optimizes resource utilization. The closed-loop alkali liquid replenishment system re-injects the filtered circulating alkali liquid into the filter cartridge, reducing alkali liquid consumption and operating costs, while also preventing environmental pollution caused by alkali liquid discharge, thereby achieving efficient recycling of resources. After electrolysis stops, nitrogen replaces the gas in the separator, and the pressure transmitter monitors the pressure in real time, automatically releasing pressure when overpressure occurs, fully ensuring the safety of equipment and personnel. In addition, the modular design facilitates installation, disassembly, and maintenance, shortening maintenance time and improving equipment utilization.

[0077] This device combines seawater desalination with hydrogen production, forming a complete process from seawater intake to hydrogen output. This improves system integration and operational efficiency, providing a mature technical solution for large-scale seawater desalination and hydrogen production. Its innovative process is suitable for distributed hydrogen production in coastal areas, enabling a stable hydrogen supply for fuel cells, chemical industries, and other sectors, reducing the costs and risks of long-distance hydrogen transportation and significantly promoting the development of the hydrogen energy industry.

[0078] In summary, this seawater desalination hydrogen production device and process flow have demonstrated significant advantages in precise control, structural stability, resource utilization efficiency, safety, and process innovation, and have broad market application prospects and important industrial promotion significance.

[0079] The embodiment described above is only a preferred solution of the present application and does not limit the present application in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A seawater desalination hydrogen production device, characterized in that: include: A base (1) with a closed bottom and an outer shell cylinder (3) that penetrates axially, a seawater through hole (2) is provided on the side wall of the base (1), and the outer shell cylinder (3) is fixed to the top of the base (1); Pneumatic lifting mechanism: comprising an air-closed pneumatic head (6), a pneumatic head bracket (5) and a connecting bracket (4) connected in sequence from top to bottom, and a connecting rod (7) having one end connected to the output end of the pneumatic head and the other end fixed to the top of the filter cartridge (8); A filter cartridge (8) is disposed inside the outer shell (3), wherein the side wall of the filter cartridge is covered with a selective permeation membrane (12) and is provided with a plurality of filter holes (11), and a water inlet (9) and a water outlet (10) are provided at the bottom; A water inlet pipe (13) connected to the water inlet (9) and a water outlet pipe (14) connected to the water outlet (10) are used to form an alkali solution circulation path; the filter cartridge is driven to rise and fall by controlling the air-closed pneumatic head (6) to adjust the osmotic pressure difference, thereby achieving a dynamic balance between seawater desalination and alkali solution concentration.

2. A seawater desalination hydrogen production device according to claim 1, characterized in that: Also includes: A base flange (15) is provided on the upper portion of the side wall of the base (1), a shell cylinder flange (16) is fixed to the bottom side wall of the shell cylinder (3), and the base flange (15) and the shell cylinder flange (16) are threadedly connected via a first stud (17); The sealing plate (18) is fixed to the bottom of the filter cartridge (8), and the sealing plate (18) is provided with through holes (19) corresponding to the water inlet (9) and the water outlet (10) of the filter cartridge.

3. The seawater desalination hydrogen production device according to claim 1, characterized in that: An upper cover flange (20) is provided at the bottom of the connecting bracket (4), a flange (21) is fixed to the upper side wall of the outer shell cylinder (3), and the upper cover flange (20) and the flange (21) are threadedly connected via a second stud (22).

4. A seawater desalination hydrogen production device according to claim 2 or 3, characterized in that: Sealing gaskets (23) are filled between the upper cover flange (20) and the flange sheet (21) and between the base flange (15) and the shell cylinder flange (16); An annular protrusion (34) is provided on the upper portion of the filter cartridge (8) and the upper portion of the sealing plate (18) for abutting against the sealing gasket (23) to achieve a sealing effect.

5. The seawater desalination hydrogen production device according to claim 1, characterized in that: Also included is a circular flange (24); A cylinder (25) having a diameter larger than that of the connecting rod is fixed to the end of the connecting rod (7), and the cylinder (25) is embedded in a circular flange (24) provided on the top of the filter cartridge (8); A stepped hole (26) is provided at the center of the circular flange (24), including a first section hole (27) for accommodating the connecting rod (7) and a second section hole (28) for limiting the cylindrical body (25), and a plurality of connecting screw holes (29) are evenly distributed around the circumference of the circular flange (24).

6. The seawater desalination hydrogen production device according to claim 1, characterized in that: A liquid level sensor (30) is provided in the filter cartridge (8), and the liquid level sensor (30) is electrically connected to the air-closed pneumatic head (6) for controlling the opening and closing of the pneumatic head according to the liquid level height in the filter cartridge (8).

7. The seawater desalination hydrogen production device according to claim 1, characterized in that: The diameter of the outer shell cylinder (3) is larger than the diameter of the filter cartridge (8); an infiltration cavity (31) is formed between the outer shell cylinder (3) and the filter cartridge (8), and the infiltration cavity (31) is connected to external seawater through the side wall through hole (2) of the base (1).

8. The seawater desalination hydrogen production device according to claim 1, characterized in that: Also includes: The guide mechanism comprises a guide portion (32) fixed to the outer wall of the filter cartridge (8) and a guide rod (33) mounted on the inner wall of the outer shell cylinder (3); the guide portion (32) is sleeved on the guide rod (33) and is used to limit the moving path of the filter cartridge (8).

9. A process for producing hydrogen from seawater desalination using the seawater desalination hydrogen production device according to any one of claims 1 to 8, characterized in that: include: S1: Alkali solution circulation supply, the alkali solution external pipe and the alkali solution filter are synchronously connected through the water inlet pipe of the seawater desalination hydrogen production device. The alkali solution external pipe is used to inject the initial alkali solution into the filter cartridge, and the alkali solution filter is used to inject the filtered circulating alkali solution back into the filter cartridge, forming a closed-loop alkali solution supply system; S2: Seawater penetrates into the filter cartridge through the selective permeation membrane and mixes with the alkali solution. The mixed solution is pumped through the outlet pipe to the alkali solution filter to separate pure water and circulating alkali solution; S3: The circulating alkali solution is purified by the alkali filter and then flows back to the filter cartridge through the water inlet pipe; Pure water is transported to the electrolyzer for electrolysis to produce hydrogen. The electrolysis reaction is carried out in an alkaline electrolyte environment to generate hydrogen and oxygen. S4: The hydrogen and oxygen generated by electrolysis are respectively introduced into the hydrogen separator and oxygen separator, and are dehydrated and dried in the hydrogen-water separator and oxygen-water separator before being output.

10. The process for producing hydrogen from seawater desalination according to claim 9, characterized in that: After S3 stops electrolysis, it also includes: a) continuously introducing nitrogen into the hydrogen separator and oxygen separator through the nitrogen injection pipeline for gas replacement; b) During the replacement process, the internal pressure of the hydrogen separator and oxygen separator is monitored by a pressure transmitter; c) When the pressure reaches a predetermined high-pressure threshold, close the nitrogen inlet valve and open the manual pressure relief valve to reduce the pressure to a predetermined low-pressure threshold; d) repeating steps ac at least three times to complete the gas replacement cycle; e) After the replacement is completed, the inside of the separator is maintained at normal pressure.

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