Direct seawater circulation and hydrogen production system utilizing low-quality marine new energy and working method

Abstract

Disclosed are a direct seawater circulation and hydrogen production system and a working method therefor. The system includes: a hydrogen production module configured to generate magnesium hydroxide p

Description

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[01] The present invention belongs to the technical field of low-quality marine green energy utilization, and in particular to a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy, and a working method therefor. BACKGROUND ART

[02] Hydrogen is considered the most promising energy carrier to provide a clean, reliable, and sustainable energy system. In order to transform fossil energy into green and clean energy, it is ideal practice to use water electrolysis based hydrogen production, which is also currently a research focus in the field of new energy. Seawater is known as the most extensive “hydrogen ore” on the earth. Although seawater electrolysis is the optimal solution to hydrogen production, revolutionary breakthrough still has to be made for the industrial popularization. Direct seawater electrolysis based hydrogen production is now basically in the experimental stage all over the world because of its considerable difficulties. The majority of existing seawater based hydrogen production focus on indirect seawater based hydrogen production with the essence of fresh water based hydrogen production. That is, seawater is firstly desalinated into high-purity fresh water for hydrogen production. As a complicated technological process, seawater desalination and purification relies on the combined action of a variety of apparatuses and technologies upon the massive energy and capital investment. Impurities of the complexly-composed seawater will lead to filtration device blockage, catalyst deactivation, a low electrolysis efficiency, a high cost, etc., which has become a critical problem in practical application. Moreover, water-insoluble impurities will deposit and adhere to a catalyst surface and an ion exchange membrane in the process of seawater based hydrogen production. Accordingly, an ion channel and catalytic active sites will be blocked, resulting in catalyst deactivation and ion exchange membrane failure.

[03] Currently, there has not been an effective method for efficiently improving seawater electrolysis based hydrogen production in the prior art. The water electrolysis based hydrogen production still suffers from seawater desalination and purification, strict and complicated technological production requirements, a low electrolysis efficiency, etc., which has a dramatical impact on the economic practicability. SUMMARY

[04] Objectives of the present invention are to provide a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy and a working method therefor. According to the present invention, with simple sand and stones and visible objects filtered out, seawater reacts with magnesium to obtain magnesium hydroxide precipitate and hydrogen, and magnesium and hydrochloric acid are recycled through magnesium hydroxide and subsequent hydrochloric acid upon an electrolysis system, etc. The seawater reacting with the magnesium is not required to further undergo any treatment. Accordingly, a technological process of seawater electrolysis based hydrogen production is greatly simplified, and a hydrogen production cost is greatly reduced.

[05] The objectives of the present invention are realized as follows: a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy includes:

[06] a hydrogen production module configured to generate magnesium hydroxide precipitate and hydrogen through a reaction between magnesium and seawater;

[07] a neutralization module configured to neutralize a reaction between the magnesium hydroxide precipitate and hydrochloric acid, so as to obtain a magnesium chloride solution;

[08] an electrolysis module configured to electrolyze magnesium chloride, so as to obtain magnesium and chlorine used in the hydrogen production system;

[09] a hydrochloric acid generation module configured to generate hydrochloric acid and oxygen, where the oxygen is collected in an oxygen storage tank; and

[10] a power supply device module, where the power supply device module is connected to the electrolysis module and configured to supply power to the electrolysis module; where

[11] the hydrochloric acid generation module is connected to the electrolysis module and the neutralization module separately, the neutralization module is connected to the electrolysis module, and the hydrogen production module is connected to the neutralization module.

[12] Preferably, the hydrogen production module includes:

[13] a first magnesium powder tank, where the first magnesium powder tank is connected to the seawater through a first conveying pipeline, so as to generate hydrogen; and

[14] a hydrogen storage tank, where the hydrogen storage tank is connected to the first magnesium powder tank through a second conveying pipeline and collects the hydrogen generated through the first magnesium powder tank;

[15] the neutralization module includes a first reaction tank, a hydrochloric acid tank, and a water tank, where the first reaction tank is connected to the first magnesium powder tank through a third conveying pipeline,

[16] the hydrochloric acid tank is connected to the first reaction tank through a fourth conveying pipeline, and the first reaction tank is connected to the water tank via a ninth valve; and

[17] the electrolysis module includes a magnesium chloride reaction tank, where the power supply device module is connected to the magnesium chloride reaction tank.

[18] Preferably, the hydrochloric acid generation module includes a second reaction tank, where the second reaction tank is connected to an oxygen storage tank, the second reaction tank is connected to the hydrochloric acid tank, and hydrochloric acid in the second reaction tank is conveyed to the hydrochloric acid tank;

[19] the magnesium chloride reaction tank is connected to a separator via a thirteenth valve, and the separator is connected to a second magnesium powder tank through a fifth conveying pipeline; and the separator is connected to a chlorine tank via a fifteenth valve, and the chlorine tank is connected to the second reaction tank.

[20] Preferably, the first conveying pipeline includes a first valve, where the first valve is connected to a first centrifugal pump, the first centrifugal pump is connected to a first regulation valve, the first regulation valve is connected to a first flowmeter, the first flowmeter is connected to a second valve, and the second valve is connected to a resistance wire;

[21] the resistance wire is connected to a third valve, and the third valve is connected to the first magnesium powder tank; the resistance wire is connected to a controller, the controller is connected to a temperature sensor, and the temperature sensor is connected to the first magnesium powder tank; and

[22] the second conveying pipeline is connected to a hydrogen filter through the first magnesium powder tank via a fifth valve, the hydrogen filter is connected to a sixth valve, and the sixth valve is connected to the hydrogen storage tank.

[23] Preferably, a third channel includes a magnesium hydroxide precipitate tank, where the magnesium hydroxide precipitate tank is connected to the first magnesium powder tank via a seventh valve, and

[24] the magnesium hydroxide precipitate tank is connected to the first reaction tank via an eighth valve;

[25] a fourth channel includes a tenth valve, where the tenth valve is connected to a second regulation valve, the second regulation valve is connected to a second flowmeter, the second flowmeter is connected to an eleventh valve, and the eleventh valve is connected to the first reaction tank; and

[26] the first reaction tank is connected to the magnesium chloride reaction tank via a twelfth valve.

[27] Preferably, the hydrochloric acid generation module is divided into two portions, one portion thereof is configured to generate hydrochloric acid and hypochlorous acid upon a reaction between chlorine decomposed through the electrolysis module and water, and the other portion thereof is configured to decompose hypochlorous acid through an illumination control module, so as to generate hydrochloric acid and oxygen.

[28] Preferably, the power supply device module includes wind power generation, solar power generation, and tidal power generation.

[29] Preferably, the first magnesium powder tank is connected to a pressure sensor through a second centrifugal pump via a fourth valve.

[30] Preferably, the fifth conveying pipeline includes a chlorine tank, the separator is connected to the chlorine tank via the fifteenth valve, the chlorine tank is connected to the second reaction tank, and the second reaction tank is connected to the water tank via a sixteenth valve.

[31] A working method for a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy includes:

[32] step SI: adding magnesium powder to react with seawater, so as to obtain magnesium hydroxide precipitate and hydrogen, and extracting the hydrogen into a hydrogen storage tank;

[33] step S2: enabling magnesium hydroxide obtained in step SI to react with added hydrochloric acid, so as to obtain a magnesium chloride solution;

[34] step S3: electrolyzing magnesium chloride obtained in step S2 to obtain magnesium and chlorine;

[35] step S4: enabling the chlorine obtained in step S3 to react with water, so as to obtain hydrochloric acid and hypochlorous acid; and

[36] step S5: decomposing the hypochlorous acid obtained in step S4 through illumination supplied by a illumination control module, so as to obtain hydrochloric acid required in step S2 and oxygen, and storing obtained oxygen in an oxygen storage tank.

[37] Compared with the prior art, the present invention has the following improvements and advantages: 1. The complexity of the hydrogen production system is simplified through the combined use of the hydrogen production module, the neutralization module, the electrolysis module, and the hydrochloric acid generation module. Moreover, the magnesium and water molecules in primary seawater undergo a displacement reaction to generate the magnesium hydroxide, and other carbonate ions, silicate ions, etc. that can react with the magnesium only consume a small amount of metal Mg without any treatment. A magnesium carbonate solution is formed through the carbonate ions, and magnesium silicate precipitate is formed through the silicate ions. The magnesium hydroxide is also formed into the precipitate, thereby reducing a hydrogen production cost.

[38] 2. The magnesium is cyclically applied through the low-quality marine new energy, thereby improving a hydrogen production efficiency and reducing the hydrogen production cost. A small amount of magnesium silicate contained in the obtained magnesium hydroxide reacts with the hydrochloric acid to generate a magnesium chloride solution. The magnesium chloride is electrolyzed to obtain the required magnesium and chlorine, so that the magnesium is recycled. The whole process is free of other by-products. Therefore, the magnesium and the hydrochloric acid are further efficiently used, a seawater electrolysis efficiency is improved, and the hydrogen production cost is reduced.

[39] 3. The low-quality marine new energy in deep and distant seas is fully utilized to solve the difficulty in power transmission and transformation. Wind power generation, solar power generation, and tidal power generation positioned in the deep and distant seas belong to low-quality periodic power generation and have extraordinarily high power transmission and transformation losses and difficulties. The present system is fully utilized to perform primary seawater based hydrogen production. Therefore, the high seawater electrolysis cost can be further reduced, the hydrogen production cost can be reduced, the hydrogen production efficiency can be greatly improved, and the deficiency of the water electrolysis based hydrogen production can be diminished. BRIEF DESCRIPTION OF THE DRAWINGS

[40] FIG. 1 is a schematic structural diagram of a system according to the present invention.

[41] FIG. 2 is a schematic working diagram of the present invention.

[42] FIG. 3 is a working flowchart of the present invention.

[43] In the figures: 1. seawater, 2. first valve, 3. first centrifugal pump, 4. first regulation valve, 5. first flowmeter, 6. second valve, 7. resistance wire, 8. third valve, 9. first magnesium powder tank, 10. controller, 11. temperature sensor, 12. pressure sensor, 13. fourth valve, 14. second centrifugal pump, 15. fifth valve, 16. hydrogen filter, 17. sixth valve, 18. hydrogen storage tank, 19. seventh valve, 20. magnesium hydroxide precipitate tank, 21. eighth valve, 22. first reaction tank, 23. ninth valve, 24. water tank, 25. hydrochloric acid tank, 26. tenth valve, 27. second regulation valve, 28. second flowmeter, 29. eleventh valve, 30. twelfth valve, 31. magnesium chloride reaction tank, 32. power supply device module, 33. thirteenth valve, 34. separator, 35. fourteenth valve, 36. second magnesium powder tank, 37. fifteenth valve, 38. chlorine tank, 39. second reaction tank, 40. sixteenth valve, 41. seventeenth valve, 42. oxygen storage tank, and 43. illumination control system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[44] The present invention is further described below with reference to the accompanying drawings.

[45] FIG 1 shows a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy. The direct seawater 1 circulation and hydrogen production system includes:

[46] a hydrogen production module configured to generate magnesium hydroxide precipitate and hydrogen through a reaction between magnesium and seawater 1;

[47] a neutralization module configured to neutralize a reaction between the magnesium hydroxide precipitate and hydrochloric acid, so as to obtain a magnesium chloride solution;

[48] an electrolysis module configured to electrolyze magnesium chloride, so as to obtain magnesium and chlorine used in the hydrogen production system;

[49] a hydrochloric acid generation module configured to generate hydrochloric acid and oxygen, where the oxygen is collected in an oxygen storage tank 42; and

[50] a power supply device module 32, where the power supply device module 32 is connected to the electrolysis module and configured to supply power to the electrolysis module; where

[51] the hydrochloric acid generation module is connected to the electrolysis module and the neutralization module separately, the neutralization module is connected to the electrolysis module, and the hydrogen production module is connected to the neutralization module.

[52] Primary seawater without any treatment can directly produce the hydrogen. The magnesium and water molecules in the primary seawater undergo a displacement reaction to generate the magnesium hydroxide, and other carbonate ions, silicate ions, etc. that can react with the magnesium only consume a small amount of metal Mg without any treatment. A magnesium carbonate solution is formed through the carbonate ions, and magnesium silicate precipitate is formed through the silicate ions. The magnesium hydroxide is also formed into the precipitate. A small amount of magnesium silicate contained in the obtained magnesium hydroxide reacts with the hydrochloric acid to generate the magnesium chloride solution. The magnesium chloride is electrolyzed to obtain the required magnesium and chlorine, so that the magnesium is recycled. The whole process is free of other by-products. Then the magnesium continues to react with the water to generate the magnesium hydroxide precipitate and the hydrogen, thereby forming a set of circulation system.

[53] Further, the hydrogen production module includes a first magnesium powder tank 9, the seawater 1 is connected to a first valve 2, the first valve 2 is connected to a first centrifugal pump 3, the first centrifugal pump 3 is connected to a first regulation valve 4, the first regulation valve 4 is connected to a first flowmeter 5, the first flowmeter 5 is connected to a second valve 6, and the second valve 6 is connected to a resistance wire 7. The resistance wire 7 is connected to a third valve 8, and that third valve 8 is connected to the first magnesium power tank 9.

[54] The resistance wire 7 is connected to a controller 10, the controller 10 is connected to a temperature sensor 11, and the temperature sensor 11 is connected to the first magnesium powder tank 9. The temperature sensor 11 transmits the heat of the first magnesium powder tank 9 to the controller 10, and the controller 10 controls the temperature of the first magnesium powder tank 9 by regulating the temperature of the resistance wire 7.

[55] The first magnesium powder tank 9 is connected to a pressure sensor 12, and the pressure sensor 12 is connected to the first magnesium powder tank 9 through a second centrifugal pump 14 via a fourth valve 13. The first magnesium powder tank 9 is connected to a hydrogen storage tank 18, the first magnesium powder tank 9 is connected to a hydrogen filter 16 via a fifth valve 15, the hydrogen filter 16 is connected to a sixth valve 17, and the sixth valve 17 is connected to the hydrogen storage tank 18. The hydrogen generated through the first magnesium powder tank 9 is stored in the hydrogen storage tank 18 through the hydrogen filter 16.

[56] Further, the neutralization module includes a first reaction tank 22, the hydrogen production module generates the magnesium hydroxide precipitate and the hydrogen through the reaction between the magnesium and the seawater 1, the first magnesium powder tank 9 is connected to a seventh valve 19, the seventh valve 19 is connected to a magnesium hydroxide precipitate tank 20, and the magnesium hydroxide precipitate tank 20 stores the magnesium hydroxide precipitate. The magnesium hydroxide precipitate tank 20 is connected to an eighth valve 21, and the eighth valve 21 is connected to the first reaction tank 22. The first reaction tank 22 is connected to a hydrochloric acid tank 25, the hydrochloric acid tank 25 is connected to a tenth valve 26, the tenth valve 26 is connected to a second regulation valve 27, the second regulation valve 27 is connected to a second flowmeter 28, the second flowmeter 28 is connected to an eleventh valve 29, and the eleventh valve 29 is connected to the first reaction tank, so that the first reaction tank 22 is connected to the hydrochloric acid tank 25.

[57] Further, the first reaction tank 22 is connected to a water tank 24 via a ninth valve 23, the water tank 24 is connected to a sixteenth valve 40, the sixteenth valve 40 is connected to a second reaction tank 39, and the first reaction tank 22 is connected to a magnesium chloride reaction tank 31 via a twelfth valve 30. Therefore, the neutralization module is configured to send the magnesium chloride solution obtained upon the reaction between the magnesium hydroxide precipitate and the hydrochloric acid into the magnesium chloride reaction tank 31.

[58] The power supply device module 32 is connected to the magnesium chloride reaction tank 31. The power supply device module 32 includes wind power generation, solar power generation and tidal power generation. The magnesium chloride reaction tank 31 is connected to a separator 34 via a thirteenth valve 33.

[59] Further, the hydrochloric acid generation module includes the second reaction tank 39, and the second reaction tank 39 is connected to an oxygen storage tank 42 via a seventeenth valve 41. The second reaction tank 39 is connected to the hydrochloric acid tank 25, and hydrochloric acid in the second reaction tank 39 is conveyed to the hydrochloric acid tank 25. The separator 34 is connected to a chlorine tank 38 via a fifteenth valve 37, and the chlorine tank 38 is connected to the second reaction tank 39. The separator 34 is connected to a second magnesium powder tank 36 via a fourteenth valve 35, and the second magnesium powder tank 36 is connected to the first magnesium powder tank 9. The second reaction tank 39 decomposes hypochlorous acid through an illumination control module 43, so as to generate hydrochloric acid and oxygen.

[60] A working method for a direct seawater circulation and hydrogen production system utilizing low-quality marine new energy includes:

[61] step SI : magnesium powder is added to react with seawater, so as to obtain magnesium hydroxide precipitate and hydrogen, and the hydrogen is extracted into a hydrogen storage tank 18;

[62] step S2: magnesium hydroxide obtained in step SI reacts with added hydrochloric acid, so as to obtain a magnesium chloride solution;

[63] step S3: magnesium chloride obtained in step S2 is electrolyzed to obtain magnesium and chlorine;

[64] step S4: the chlorine obtained in step S3 reacts with water, so as to obtain hydrochloric acid and hypochlorous acid; and

[65] step S5: the hypochlorous acid obtained in step S4 is decomposed through illumination supplied by a illumination control module 43, so as to obtain hydrochloric acid required in step S2 and oxygen, and obtained oxygen is stored in an oxygen storage tank 42.

[66] When the system is activated, starting from the hydrogen production module, the seawater 1 flows to the first magnesium powder tank 9 via the first valve 2, the first centrifugal pump 3, and the first regulation valve 4 and starts to react with magnesium powder. An outer side of the first magnesium powder tank 9 is provided with a heating insulation layer that can accelerate a reaction rate between the magnesium and the water. The controller 10 regulates the temperature supplied by the resistance wire 7 and the pressure supplied by the first centrifugal pump 3. The magnesium hydroxide precipitate generated through the reaction enters the magnesium hydroxide precipitate tank 20. The obtained hydrogen enters the hydrogen storage tank 18 through the hydrogen filter 16 via the fifth valve 15 and the sixth valve 17. Then the magnesium hydroxide precipitate enters the neutralization module. The hydrochloric acid in the hydrochloric acid tank 25 flows into the first reaction tank 22 by opening the tenth valve 26, the eleventh valve 29, and the second regulation valve 27, and turning on the second flowmeter 28 for regulation. The magnesium hydroxide precipitate is doped in the first reaction tank 22 by opening the seventh valve 19 and the eighth valve 21, and the water obtained through the reaction flows to the water tank 24 by opening the ninth valve 23. The obtained magnesium chloride solution enters the magnesium chloride reaction tank 31, and then enters the electrolysis module. The magnesium chloride obtained through the neutralization module is electrolyzed through the power supplied by the power supply device module 32. After the thirteenth valve 33, the fourteenth valve 35, and the fifteenth valve 37 are opened, and the separator 34 is turned on, electrolyzed magnesium is put into the second magnesium powder tank 36 and then enters the magnesium powder tank of the hydrogen production module for recycling. The electrolyzed chlorine is put into the chlorine tank 38 and finally enters the hydrochloric acid generation module. The water obtained through the neutralization module in the water tank 24 flows into the second reaction tank 39 via the sixteenth valve 40, the chlorine electrolyzed through the electrolysis module in the chlorine tank 38 also flows into the second reaction tank 39. The hydrochloric acid obtained through the illumination control module 43 flows into the hydrochloric acid tank 25 for recycling, and the oxygen is stored in the oxygen storage tank 42.

[67] Working principle: starting from the reaction between the magnesium powder and the seawater 1, that is, the primary seawater without any treatment directly produces the hydrogen, and thus the magnesium hydroxide precipitate and the hydrogen are generated through the reaction. Then the obtained hydrogen is stored in the hydrogen storage tank 18. The magnesium hydroxide reacts with the hydrochloric acid supplied by the hydrochloric acid generation module to obtain the magnesium chloride solution. The magnesium chloride is electrolyzed through the power supplied upon solar energy, wind energy, and tidal energy, so as to obtain the magnesium and the chlorine. Finally, the magnesium continues to react with the water to obtain the magnesium hydroxide precipitate and the hydrogen, thereby forming a set of circulation system. For the hydrochloric acid generation module, the chlorine obtained by electrolyzing the magnesium chloride reacts with the water. The illumination is utilized for pressurization to reduce the concentration of the hypochlorous acid. The hypochlorous acid continues to react to the right, so as to generate the hydrochloric acid and the oxygen, and the oxygen can be stored in the oxygen storage tank 42.

[68] Through the combined use of the hydrogen production module, the neutralization module, the electrolysis module, and the hydrochloric acid generation module, the hydrogen can be acquired from the primary seawater 1 without filtering and purifying the primary seawater 1. Therefore, a technological process that pure water is required to be prepared firstly for the current direct seawater 1 electrolysis based hydrogen production is directly changed, and the problem that the in-situ seawater electrolysis based hydrogen production according to the latest development still cannot directly utilize the primary seawater is solved. Accordingly, a seawater electrolysis technology is simplified, the seawater based hydrogen production difficulty and cost are reduced, the hydrogen production efficiency is greatly improved, and the present invention is rapidly applied in practice.

[69] What are described above are merely the embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should fall within the scope of protection of the disclosure. 03 24

Claims

1. A direct seawater circulation and hydrogen production system, comprising:a hydrogen production module configured to generate magnesium hydroxide precipitate and hydrogen through a reaction between magnesium and seawater (1);a neutralization module configured to perform a neutralization reaction between magnesium hydroxide and hydrochloric acid, so as to obtain a magnesium chloride solution;an electrolysis module configured to electrolyze magnesium chloride, so as to obtain magnesium for use in the reaction with seawater in the hydrogen production module and chlorine for use ina hydrochloric acid generation module configured to generate hydrochloric acid and oxygen, wherein the oxygen is collected in an oxygen storage tank (42); anda power supply device module (32), wherein the power supply device module (32) is connected to the electrolysis module and configured to supply power to the electrolysis module;the hydrochloric acid generation module is connected to the electrolysis module and the neutralization module separately, the neutralization module is connected to the electrolysis module, and the hydrogen production module is connected to the neutralization module;wherein the hydrogen production module comprises:a first magnesium powder tank (9), wherein the first magnesium powder tank (9) is connected to the seawater (1) through a first conveying pipeline, so as to generate hydrogen; anda hydrogen storage tank (18), wherein the hydrogen storage tank (18) is connected to the first magnesium powder tank (9) through a second conveying pipeline and collects the hydrogen generated through the first magnesium powder tank (9);the neutralization module comprises a first reaction tank (22), a hydrochloric acid tank (25), and a water tank (24), wherein the first reaction tank (22) is connected to the first magnesium powder tank (9) through a third conveying pipeline,■03 24the hydrochloric acid tank (25) is connected to the first reaction tank (22) through a fourth conveying pipeline, and the first reaction tank (22) is connected to the water tank (24) via a ninth valve (23);the electrolysis module comprises a magnesium chloride reaction tank (31), wherein the power supply device module (32) is connected to the magnesium chloride reaction tank (31);wherein the hydrochloric acid generation module comprises a second reaction tank (39), wherein the second reaction tank (39) is connected to an oxygen storage tank (42) via a seventeenth valve (41), the second reaction tank (39) is connected to the hydrochloric acid tank (25), and hydrochloric acid in the second reaction tank (39) is conveyed to the hydrochloric acid tank (25);the magnesium chloride reaction tank (31) is connected to a separator (34) via a thirteenth valve (33), and the separator (34) is connected to a second magnesium powder tank (36) through a fifth conveying pipeline; and the separator (34) is connected to a chlorine tank (38) via a fifteenth valve (37), and the chlorine tank (38) is connected to the second reaction tank (39).

2. The direct seawater circulation and hydrogen production system according to claim 1, wherein the first conveying pipeline comprises a first valve (2), wherein the first valve (2) is connected to a first centrifugal pump (3), the first centrifugal pump (3) is connected to a first regulation valve (4), the first regulation valve (4) is connected to a first flowmeter (5), the first flowmeter (5) is connected to a second valve (6), and the second valve (6) is connected to a resistance wire (7);the resistance wire (7) is connected to a third valve (8), and the third valve (8) is connected to the first magnesium powder tank (9); the resistance wire (7) is connected to a controller (10), the controller (10) is connected to a temperature sensor (11), and the temperature sensor (11) is connected to the first magnesium powder tank (9); andthe second conveying pipeline is connected to a hydrogen filter (16) through the first magnesium powder tank (9) via a fifth valve (15), the hydrogen filter (16) is connected to a sixth valve (17), and the sixth valve (17) is connected to the hydrogen storage tank (18).03 243. The direct seawater circulation and hydrogen production according to claim 1, wherein a third channel comprises a magnesium hydroxide precipitate tank (20), wherein the magnesium hydroxide precipitate tank (20) is connected to the first magnesium powder tank (9) via a seventh valve (19), andthe magnesium hydroxide precipitate tank (20) is connected to the first reaction tank (22) via an eighth valve (21);a fourth channel comprises a tenth valve (26), wherein the tenth valve (26) is connected to a second regulation valve (27), the second regulation valve (27) is connected to a second flowmeter (28), the second flowmeter (28) is connected to an eleventh valve (29), and the eleventh valve (29) is connected to the first reaction tank (22); andthe first reaction tank is connected to the magnesium chloride reaction tank (31) via a twelfth valve (30).

4. The direct seawater circulation and hydrogen production system according to claim 1, wherein the hydrochloric acid generation module is divided into two portions, one portion thereof is configured to generate hydrochloric acid and hypochiorous acid upon a reaction between chlorine decomposed through the electrolysis module and water, and the other portion thereof is configured to decompose hypochlorous acid through an illumination control module (43), so as to generate hydrochloric acid and oxygen.

5. The direct seawater circulation and hydrogen production system according to claim 1, wherein the power supply device module (32) comprises wind power generation, solar power generation, and tidal power generation.

6. The direct seawater circulation and hydrogen production system according to claim 2, wherein the first magnesium powder tank (9) is connected to a pressure sensor (12) through a second centrifugal pump (14) via a fourth valve (13).

7. The direct seawater circulation and hydrogen production system according to claim 3, wherein the fifth conveying pipeline comprises a chlorine tank (38), the separator (34) is connected to the chlorine tank (38) through the fifteenth valve (37), the chlorine tank (38) is connected to the second reaction tank (39), and the second reaction tank (39) is connected to the water tank (24) via a sixteenth valve (40).

8. A method for direct seawater circulation and hydrogen production, comprising03 24using a direct seawater circulation and hydrogen production system, the system comprising:a hydrogen production module configured to generate magnesium hydroxide precipitate and hydrogen through a reaction between magnesium and seawater (1);a neutralization module configured to perform a neutralization reaction between magnesium hydroxide and hydrochloric acid, so as to obtain a magnesium chloride solution;an electrolysis module configured to electrolyze magnesium chloride, so as to obtain magnesium for use in the reaction with seawater in the hydrogen production module and chlorine for use ina hydrochloric acid generation module configured to generate hydrochloric acid and oxygen, wherein the oxygen is collected in an oxygen storage tank (42); anda power supply device module (32), wherein the power supply device module (32) is connected to the electrolysis module and configured to supply power to the electrolysis module;the hydrochloric acid generation module is connected to the electrolysis module and the neutralization module separately, the neutralization module is connected to the electrolysis module, and the hydrogen production module is connected to the neutralization module;the method comprising the following steps:step S1: in the hydrogen production module, adding magnesium powder to react with seawater, so as to obtain magnesium hydroxide precipitate and hydrogen, and extracting the hydrogen into the hydrogen storage tank (18);step S2: in the neutralization, enabling magnesium hydroxide obtained in step SI to react with added hydrochloric acid, so as to obtain magnesium chloride and water;step S3: in the electrolysis module, electrolyzing the magnesium chloride obtained in step S2 to obtain magnesium and chlorine;step S4: in the hydrochloric acid module, enabling the chlorine obtained in step S3 to react with water, so as to obtain hydrochloric acid and hypochlorous acid; andstep S5: further in the hydrochloric acid module decomposing the hypochlorous acidobtained in step S4 through illumination supplied by a illumination control module (43), so as to obtain the hydrochloric acid required in step S2 and oxygen, and storing obtained oxygen in an oxygen storage tank (42).03 24

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