Alkaline water electrolysis hydrogen production system with automatic supply function

Abstract

The utility model relates to the technical field of hydrogen production equipment, and discloses an alkaline water electrolysis hydrogen production system with an automatic replenishment function, which comprises an electrolytic bath, and an oxygen collection subsystem, a hydrogen collection subsystem, an automatic alkaline liquor replenishment subsystem, an automatic electrolyzed water replenishment subsystem and an electrolyte concentration detection subsystem which are connected with the electrolytic bath, the automatic alkali liquor replenishment subsystem is arranged at an alkali liquor replenishment port of the electrolytic bath and is connected with the oxygen collection subsystem and the hydrogen collection subsystem through an electrolyte collection pipeline; the automatic electrolyzed water supply subsystem is arranged at an electrolyzed water supply port of the electrolytic bath; the electrolyte concentration detection subsystem is electrically connected with the electrolytic bath, the automatic alkali liquor supply subsystem and the automatic electrolyzed water supply subsystem; the system has the advantages of improving the electrolysis efficiency, reducing bubble accumulation, improving the hydrogen purity and the like, and solves the technical problems of electrolyte solution consumption, bubble accumulation, low hydrogen-oxygen separation efficiency and the like in the prior art.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production equipment, and particularly relates to an alkaline water electrolysis hydrogen production system with an automatic replenishment function. Background Art

[0002] As a way to obtain renewable energy, water electrolysis hydrogen production has received extensive attention in recent years. Especially the alkaline water electrolysis hydrogen production technology has been widely used due to its relatively low cost and high efficiency. However, during the operation of existing alkaline water electrolysis hydrogen production systems, problems such as electrolyte solution consumption, bubble accumulation, and low hydrogen-oxygen separation efficiency are often faced. These problems not only affect the stable operation of the system but also limit the hydrogen production and purity.

[0003] Electrolyte solution consumption is a common problem in alkaline water electrolysis hydrogen production systems. During electrolysis, water in the electrolyte solution is decomposed into hydrogen and oxygen, resulting in a change in solution concentration and affecting electrolysis efficiency. In addition, the bubbles generated by electrolysis are prone to accumulate on the electrode surface, forming gas resistance, reducing electrolysis efficiency, and increasing the risk of electrode corrosion. And the low hydrogen-oxygen separation efficiency directly leads to low hydrogen purity, affecting the subsequent application of hydrogen. To solve these problems, various improvement measures have been proposed in the prior art, such as increasing the automatic replenishment of the electrolyte solution, optimizing the electrode structure to reduce bubble accumulation, and improving the hydrogen-oxygen separation device. However, these measures often only solve some problems, or bring new problems when solving a certain problem, such as increasing the complexity of the system and raising the cost. Therefore, developing an alkaline water electrolysis hydrogen production system that can comprehensively solve problems such as electrolyte solution consumption, bubble accumulation, and low hydrogen-oxygen separation efficiency has important theoretical and practical significance.

[0004] Aiming at the deficiencies of the prior art, the present invention provides an alkaline water electrolysis hydrogen production system with an automatic replenishment function. By optimizing the cyclic replenishment of the electrolyte solution, improving the electrode design, and adopting an efficient hydrogen-oxygen separation technology, it aims to improve electrolysis efficiency, reduce bubble accumulation, and increase hydrogen purity, thereby realizing a stable and efficient hydrogen production process. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides an alkaline water electrolysis hydrogen production system with an automatic replenishment function, which has the advantages of improving electrolysis efficiency, reducing bubble accumulation, and increasing hydrogen purity, and solves the technical problems such as electrolyte solution consumption, bubble accumulation, and low hydrogen-oxygen separation efficiency existing in the prior art.

[0007] (2) Technical Solutions

[0008] To achieve the above object of realizing a stable and efficient hydrogen production process, the present utility model provides the following technical solutions:

[0009] An alkaline water electrolysis hydrogen production system with an automatic replenishment function, comprising an electrolytic cell, an oxygen collection subsystem and a hydrogen collection subsystem connected to the electrolytic cell, and further comprising an alkali solution automatic replenishment subsystem, an electrolyzed water automatic replenishment subsystem and an electrolyte concentration detection subsystem;

[0010] The alkali solution automatic replenishment subsystem is arranged at the alkali solution replenishment port of the electrolytic cell and is connected to the oxygen collection subsystem and the hydrogen collection subsystem through an electrolyte collection pipeline;

[0011] The electrolyzed water automatic replenishment subsystem is arranged at the electrolyzed water replenishment port of the electrolytic cell;

[0012] The electrolyte concentration detection subsystem is electrically connected to the electrolytic cell, the alkali solution automatic replenishment subsystem and the electrolyzed water automatic replenishment subsystem respectively.

[0013] In a preferred embodiment, the oxygen collection subsystem includes an oxygen collection pipeline, and an oxygen separator and an oxygen purification device arranged on the oxygen collection pipeline;

[0014] The oxygen separator is arranged at the outlet end of the oxygen collection pipeline, and the electrolyte discharge end of the oxygen separator is connected to the electrolyte collection pipeline through a first control valve;

[0015] The oxygen purification device is arranged at the oxygen discharge end of the oxygen separator, and an oxygen discharge pipeline is arranged at the oxygen discharge end of the oxygen purification device, and a second control valve is arranged on the oxygen discharge pipeline.

[0016] In a preferred embodiment, the hydrogen collection subsystem includes a hydrogen collection pipeline, and a hydrogen separator and a hydrogen purification device arranged on the hydrogen collection pipeline;

[0017] The hydrogen separator is arranged at the outlet end of the hydrogen collection pipeline, and the electrolyte discharge end of the hydrogen separator is connected to the electrolyte collection pipeline through a third control valve;

[0018] The hydrogen purification device is arranged at the hydrogen discharge end of the hydrogen separator, and a hydrogen discharge pipeline is arranged at the hydrogen discharge end of the hydrogen purification device, and a fourth control valve is arranged on the hydrogen discharge pipeline.

[0019] In a preferred embodiment, the electrolyte concentration detection subsystem includes a control module, a first online alkali solution concentration sensor and a second online alkali solution concentration sensor;

[0020] The control module is a computer PC terminal. The control module is connected to the first online caustic solution concentration sensor through the first signal circuit, and the control output end of the control module is connected to the electrolyzed water automatic replenishment subsystem through the first control circuit;

[0021] The first online caustic solution concentration sensor is arranged in the electrolytic cell;

[0022] The second online caustic solution concentration sensor is arranged in the caustic solution tank of the caustic solution automatic replenishment subsystem and is connected to the control module through the second signal circuit.

[0023] In a preferred embodiment, the caustic solution automatic replenishment subsystem includes a caustic solution tank and caustic solution replenishment pipelines symmetrically arranged on both sides of the caustic solution tank; the electrolyzed water automatic replenishment subsystem includes an electrolyzed water storage tank and an electrolyzed water replenishment pipeline, and the electrolyzed water replenishment pipeline is arranged between the electrolyzed water storage tank and the electrolytic cell.

[0024] In a preferred embodiment, a first liquid supplement pump, a flow meter and a first one-way valve are arranged on the pipelines of the caustic solution replenishment pipeline and the electrolyzed water replenishment pipeline between the electrolytic cell and the caustic solution tank; and the first liquid supplement pump arranged on the caustic solution replenishment pipeline between the electrolytic cell and the caustic solution tank is connected to the control module through the second control circuit; the first liquid supplement pump arranged on the electrolyzed water replenishment pipeline is connected to the control module through the first control circuit.

[0025] In a preferred embodiment, a fifth control valve, a second liquid supplement pump and a second one-way valve are arranged on the caustic solution replenishment pipeline on the side far from the electrolytic cell, and the second liquid supplement pump is connected to the control module through the third control circuit.

[0026] In a preferred embodiment, a plug rod is movably arranged at the water replenishing port of the electrolyzed water storage tank. The plug rod is movably arranged in the water replenishing pipe at the water replenishing port of the electrolyzed water storage tank. A floating ball is arranged at the lower end of the plug rod, and a water sealing plate is screwed on the outer side of the plug rod and is used in cooperation with the water replenishing pipe at the water replenishing port.

[0027] (III) Beneficial effects

[0028] Compared with the prior art, the present utility model provides an alkaline water electrolysis hydrogen production system with an automatic replenishment function, and has the following beneficial effects:

[0029] 1. Through the setting of the oxygen collection subsystem and the hydrogen collection subsystem, the oxygen collection subsystem and the hydrogen collection subsystem are respectively arranged at the anode and the cathode of the electrolytic cell, and an efficient separation technology is adopted to realize the rapid separation of hydrogen and oxygen, and improve the hydrogen purity; at the same time, through the setting of the first control valve, the third control valve and the electrolyte collection pipeline, the recovery and utilization of the electrolyte can be realized, and the amount of the electrolyte solution in the electrolytic cell can be maintained;

[0030] 2. Through the setting of the lye automatic replenishment subsystem, the first on-line lye concentration sensor monitors the specific gravity of the lye in the electrolytic cell in real time. When it detects that the specific gravity of the lye is lower than the set range, the lye delivery pump is automatically started to replenish lye from the lye tank, ensuring that the specific gravity of the lye in the electrolytic cell is maintained between 1.22 and 1.28, thereby optimizing the electrolysis process;

[0031] 3. Through the setting of the electrolyzed water automatic replenishment subsystem, the first on-line lye concentration sensor can monitor the specific gravity of the lye in the electrolytic cell in real time. When it detects that the specific gravity of the lye is higher than the set range, pure water is automatically replenished to maintain the amount of electrolyte solution in the electrolytic cell and ensure that the electrolysis efficiency is not affected;

[0032] 4. Through the setting of the electrolyte concentration detection subsystem, it can be used in conjunction with the lye automatic replenishment subsystem and the electrolyzed water automatic replenishment subsystem, integrated into the electrolytic hydrogen production system, and the concentration of the electrolyte is detected in real time to ensure that the concentration of the electrolyte is within the optimal range, improving the electrolysis efficiency and hydrogen production; at the same time, the automated replenishment system reduces the need for manual intervention, reduces the maintenance cost. At the same time, the optimized design reduces electrode corrosion and extends the equipment life; the purpose of a stable and efficient hydrogen production process is achieved. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the alkaline water electrolysis hydrogen production system of the present utility model;

[0034] Figure 2 It is a schematic structural diagram of the alkaline water electrolysis hydrogen production system with an automatic replenishment function of the present utility model;

[0035] Figure 3 It is a schematic structural diagram of the electrolyte concentration detection subsystem of the present utility model;

[0036] Figure 4 It is a control schematic diagram of the electrolyte concentration detection subsystem of the present utility model;

[0037] Figure 5 It is a schematic structural diagram of the electrolyzed water storage tank of the present utility model.

[0038] In the figure: 1. electrolytic cell; 2. oxygen collection subsystem; 21. oxygen collection pipeline; 22. oxygen separator; 23. oxygen purification device; 24. oxygen discharge pipeline; 25. first control valve; 26. second control valve; 3. hydrogen collection subsystem; 31. hydrogen collection pipeline; 32. hydrogen separator; 33. hydrogen purification device; 34. hydrogen discharge pipeline; 35. third control valve; 36. fourth control valve; 4. electrolyte collection pipeline; 5. alkali solution automatic replenishment subsystem; 51. alkali solution tank; 52. alkali solution replenishment pipeline; 53. first liquid replenishment pump; 54. flowmeter; 55. first one-way valve; 56. fifth control valve; 57. second liquid replenishment pump; 58. second one-way valve; 6. electrolyzed water automatic replenishment subsystem; 61. electrolyzed water storage tank; 611. floating ball; 612. insertion rod; 613. water sealing plate; 62. electrolyzed water replenishment pipeline; 7. control module; 71. first signal circuit; 72. first control circuit; 73. second control circuit; 74. third control circuit; 75. second signal circuit; 8. first on-line alkali solution concentration sensor; 9. second on-line alkali solution concentration sensor. Detailed implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1 - 5 , the present invention provides a technical solution:

[0041] An alkaline water electrolysis hydrogen production system with an automatic replenishment function, including an electrolytic cell 1, an oxygen collection subsystem 2, a hydrogen collection subsystem 3, an alkali solution automatic replenishment subsystem 5, an electrolyzed water automatic replenishment subsystem 6 and an electrolyte concentration detection subsystem connected to the electrolytic cell 1; where

[0042] The oxygen collection subsystem 2 is arranged at the anode of the electrolytic cell 1 and is used for collecting oxygen and electrolyte at the anode of the electrolytic cell 1;

[0043] The hydrogen collection subsystem 3 is arranged at the cathode of the electrolytic cell 1 and is used for collecting hydrogen and electrolyte at the anode of the electrolytic cell 1;

[0044] The lye automatic replenishment subsystem 5 is arranged at the lye replenishment port of the electrolyzer 1 and is used for automatically replenishing lye into the electrolyzer 1, so that the specific gravity of the lye in the electrolyzer 1 is within the required range (1.22 - 1.28). Moreover, the lye automatic replenishment subsystem 5 is also connected to the oxygen collection subsystem 2 and the hydrogen collection subsystem 3 through the electrolyte collection pipeline 4 to realize the recycling of the electrolyte;

[0045] The electrolyzed water automatic replenishment subsystem 6 is arranged at the electrolyzed water replenishment port of the electrolyzer 1 and is used for automatically replenishing electrolyzed water into the electrolyzer 1;

[0046] The electrolyte concentration detection subsystem is used for detecting the detected concentration in the electrolyzer 1 and the lye automatic replenishment subsystem 5, and is electrically connected to the lye automatic replenishment subsystem 5 and the electrolyzed water automatic replenishment subsystem 6 to control the actions of the lye automatic replenishment subsystem 5 and the electrolyzed water automatic replenishment subsystem 6;

[0047] In this embodiment, the lye automatic replenishment subsystem 5 and the electrolyzed water automatic replenishment subsystem 6 are used to replenish lye and electrolyzed water into the electrolyzer 1. The generated oxygen and hydrogen can be collected by the oxygen collection subsystem 2 and the hydrogen collection subsystem 3 respectively. During the process of the oxygen collection subsystem 2 and the hydrogen collection subsystem 3 collecting oxygen and hydrogen, the filtered electrolyte can return to the lye automatic replenishment subsystem 5 through the electrolyte collection pipeline 4 for reuse; At the same time, during the process of hydrogen production by electrolyzing water; When the electrolyte concentration detection subsystem detects that the concentration of the lye in the electrolyzer 1 increases due to the electrolysis of electrolyzed water and is greater than the maximum lye specific gravity C NaOH设定MAX When it is, the electrolyzed water automatic replenishment subsystem 6 is opened through a control signal to replenish electrolyzed water into the electrolyzer 1 to reduce the concentration of the lye in the electrolyzer 1; When the electrolyte concentration detection subsystem detects that the concentration of the lye in the electrolyzer 1 decreases due to the consumption of lye and is less than the minimum lye specific gravity C NaOH设定MIN When it is, the lye automatic replenishment subsystem 5 is opened through a control signal to replenish lye into the electrolyzer 1 to increase the concentration of the lye in the electrolyzer 1 to ensure the efficiency of electrolyzing water; Through this system, the automatic replenishment of electrolyzed water and lye in the process of alkaline water electrolysis for hydrogen production can be realized.

[0048] As a preferred embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the oxygen collection subsystem 2 includes an oxygen collection pipeline 21, and an oxygen separator 22 and an oxygen purification device 23 arranged on the oxygen collection pipeline 21; Wherein

[0049] The oxygen separator 22 is provided at the outlet end of the oxygen collection pipeline 21 for separating oxygen from the electrolyte, and the electrolyte discharge end of the oxygen separator 22 is connected to the electrolyte collection pipeline 4 through a first control valve 25;

[0050] The oxygen purification device 23 is provided at the oxygen discharge end of the oxygen separator 22 for purifying the oxygen after separating the electrolyte, and an oxygen discharge pipeline 24 is provided at the oxygen evacuation end of the oxygen purification device 23, and a second control valve 26 is also provided on the oxygen discharge pipeline 24;

[0051] In this embodiment, when collecting oxygen, the mixture of oxygen and electrolyte comes out from the anode of the electrolytic cell 1, goes to the oxygen separator 22 for gas-liquid separation, the separated oxygen enters the oxygen purification device 23, and the electrolyte flows back into the alkali liquid tank 51; the oxygen after separating the electrolyte is purified in the oxygen purification device 23, and the purified oxygen is discharged through the oxygen discharge pipeline 24 to complete the collection of oxygen.

[0052] As a preferred embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the hydrogen collection subsystem 3 includes a hydrogen collection pipeline 31, and a hydrogen separator 32 and a hydrogen purification device 33 provided on the hydrogen collection pipeline 31; wherein

[0053] The hydrogen separator 32 is provided at the outlet end of the hydrogen collection pipeline 31 for separating hydrogen from the electrolyte, and the electrolyte discharge end of the hydrogen separator 32 is connected to the electrolyte collection pipeline 4 through a third control valve 35;

[0054] The hydrogen purification device 33 is provided at the hydrogen discharge end of the hydrogen separator 32 for purifying the hydrogen after separating the electrolyte, and a hydrogen discharge pipeline 34 is provided at the hydrogen evacuation end of the hydrogen purification device 33, and a fourth control valve 36 is also provided on the hydrogen discharge pipeline 34;

[0055] In this embodiment, when collecting hydrogen, the mixture of hydrogen and electrolyte comes out from the cathode of the electrolytic cell 1, goes into the hydrogen separator 32 for gas-liquid separation, the separated hydrogen enters the hydrogen purification device 33, and the electrolyte flows back into the alkali liquid tank 51; the hydrogen after separating the electrolyte is purified in the hydrogen purification device 33, and the purified hydrogen is discharged through the oxygen discharge pipeline 34 to complete the collection of hydrogen.

[0056] As a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the electrolyte concentration detection subsystem includes a control module 7, a first online caustic solution concentration sensor 8, and a second online caustic solution concentration sensor 9; among which

[0057] The control module 7 is a computer PC terminal. The control module 7 is connected to the first online caustic solution concentration sensor 8 through a first signal circuit 71, and is used to receive the real-time caustic solution concentration in the electrolytic cell 1 detected by the first online caustic solution concentration sensor 8; and the control output end of the control module 7 is connected to the electrolyzed water automatic replenishment subsystem 6 through a first control circuit 72;

[0058] The first online caustic solution concentration sensor 8 is arranged in the electrolytic cell 1, and is used to detect the real-time caustic solution concentration in the electrolytic cell 1;

[0059] The second online caustic solution concentration sensor 9 is arranged in the caustic solution tank 51 of the caustic solution automatic replenishment subsystem 5, and is used to detect the real-time caustic solution concentration in the caustic solution tank 51 in real time, and is connected to the control module 7 through a second signal circuit 75;

[0060] In this embodiment, the real-time caustic solution concentration in the electrolytic cell 1 is detected by the first online caustic solution concentration sensor 8, and the detected real-time caustic solution concentration in the electrolytic cell 1 is judged. When the caustic solution concentration in the electrolytic cell 1 is greater than the maximum caustic solution specific gravity C NaOH设定MAX At this time, the electrolyzed water automatic replenishment subsystem 6 is opened through the first control circuit 72 to replenish electrolyzed water into the electrolytic cell 1 to reduce the caustic solution concentration in the electrolytic cell 1; when the caustic solution concentration in the electrolytic cell 1 is less than the minimum caustic solution specific gravity C NaOH设定MIN At this time, the caustic solution automatic replenishment subsystem 5 is opened through the second control circuit to replenish caustic solution into the electrolytic cell 1 to increase the caustic solution concentration in the electrolytic cell 1 to ensure the efficiency of electrolyzed water.

[0061] As a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 3 And Figure 4 As shown, the caustic solution automatic replenishment subsystem 5 includes a caustic solution tank 51, and caustic solution replenishment pipelines 52 symmetrically arranged on both sides of the caustic solution tank 51; the electrolyzed water automatic replenishment subsystem 6 includes an electrolyzed water storage tank 61 and an electrolyzed water replenishment pipeline 62, and the electrolyzed water replenishment pipeline 62 is arranged between the electrolyzed water storage tank 61 and the electrolytic cell 1;

[0062] During use, caustic solution is replenished into the electrolytic cell 1 through the caustic solution tank 51, and electrolyzed water is replenished into the electrolytic cell 1 through the electrolyzed water storage tank 61 to keep the caustic solution specific gravity in the electrolytic cell 1 within the required range (1.22 - 1.28).

[0063] As a preferred embodiment, as Figure 1 、 Figure 2 、Figure 3 and Figure 4 As shown in Figure 4 , a first liquid supplement pump 53, a flow meter 54 and a first one-way valve 55 are provided on the pipelines of the lye supplement pipeline 52 and the electrolyzed water supplement pipeline 62 between the electrolytic cell 1 and the lye tank 51; among them

[0064] The first one-way valve 55 is provided on the lye supplement pipeline 52 and the electrolyzed water supplement pipeline 62 close to the electrolytic cell 1;

[0065] The first liquid supplement pump 53 provided on the lye supplement pipeline 52 between the electrolytic cell 1 and the lye tank 51 is connected to the control module 7 through a second control circuit 73;

[0066] The first liquid supplement pump 53 provided on the electrolyzed water supplement pipeline 62 is connected to the control module 7 through a first control circuit 72;

[0067] During use, when the real-time lye concentration in the electrolytic cell 1 detected by the first lye on-line concentration sensor 8 is greater than the maximum lye specific gravity C NaOH设定MAX When, the first liquid supplement pump 53 provided on the electrolyzed water supplement pipeline 62 is controlled to act through the first control circuit 72, and electrolyzed water is supplied to the electrolytic cell 1 to reduce the lye concentration in the electrolytic cell 1; when the lye concentration is less than the minimum lye specific gravity C NaOH设定MIN When, the first liquid supplement pump 53 provided on the lye supplement pipeline 52 between the electrolytic cell 1 and the lye tank 51 is turned on through the second control circuit 73 to work, and lye is supplied to the electrolytic cell 1 to increase the lye concentration in the electrolytic cell 1 and ensure the efficiency of electrolyzed water.

[0068] As a preferred embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in Figure 4 , a fifth control valve 56, a second liquid supplement pump 57 and a second one-way valve 58 are provided on the lye supplement pipeline 52 on the side far from the electrolytic cell 1, for supplementing lye into the lye tank 51 through the lye supplement pipeline 52, and the second liquid supplement pump 57 is connected to the control module 7 through a third control circuit 74;

[0069] During use, when the second lye on-line concentration sensor 9 detects that the real-time lye concentration in the detected lye tank 51 is less than the set lye concentration in the detected lye tank 51, a control command is sent to the second liquid supplement pump 57 to control the second liquid supplement pump 57 to act and supplement lye into the lye tank 51.

[0070] As a preferred embodiment, as Figure 5As shown, a plug rod 612 is movably arranged at the water replenishing port of the electrolyzed water storage tank 61. The plug rod 612 is movably arranged in the water replenishing pipe at the water replenishing port of the electrolyzed water storage tank 61. A floating ball 611 is arranged at the lower end of the plug rod 612 to contact the water surface in the electrolyzed water storage tank 61. And a water sealing plate 613 is screwed and installed on the outer side of the plug rod 612 to cooperate with the water replenishing pipe at the water replenishing port. During use, the floating ball 611 drives the water sealing plate 613 to move, realizing automatic water replenishment inside the electrolyzed water storage tank 61.

[0071] The use process of the alkaline water electrolysis hydrogen production system with an automatic replenishment function of the present utility model includes:

[0072] 1. Oxygen collection process: When collecting oxygen, the mixture of oxygen and electrolyte comes out from the anode of the electrolytic cell 1 and goes to the oxygen separator 22 for gas-liquid separation. The separated oxygen enters the oxygen purification device 23, and the electrolyte flows back into the alkali solution tank 51; The oxygen after separating the electrolyte is purified in the oxygen purification device 23, and the purified oxygen is discharged through the oxygen discharge pipe 24, completing the collection of oxygen.

[0073] 2. Hydrogen collection process: When collecting hydrogen, the mixture of hydrogen and electrolyte comes out from the cathode of the electrolytic cell 1 and goes to the hydrogen separator 32 for gas-liquid separation. The separated hydrogen enters the hydrogen purification device 33, and the electrolyte flows back into the alkali solution tank 51; The hydrogen after separating the electrolyte is purified in the hydrogen purification device 33, and the purified hydrogen is discharged through the oxygen discharge pipe 34, completing the collection of hydrogen.

[0074] 3. Dynamic replenishment process of electrolyzed water and alkali solution: The real-time alkali solution concentration in the electrolytic cell 1 is detected by the first in-line alkali solution concentration sensor 8, and the detected real-time alkali solution concentration in the electrolytic cell 1 is judged. When the detected alkali solution concentration in the electrolytic cell 1 is greater than the maximum alkali solution specific gravity C NaOH设定MAX At this time, the electrolyzed water automatic replenishment subsystem 6 is opened through the first control circuit 72 to replenish electrolyzed water into the electrolytic cell 1 to reduce the alkali solution concentration in the electrolytic cell 1; When the alkali solution concentration in the electrolytic cell 1 is less than the minimum alkali solution specific gravity C NaOH设定MIN At this time, the alkali solution automatic replenishment subsystem 5 is opened through the second control circuit to replenish alkali solution into the electrolytic cell 1 to increase the alkali solution concentration in the electrolytic cell 1 to ensure the efficiency of electrolyzed water.

[0075] It should be noted that in the present utility model, the above-mentioned electrolytic cell 1, oxygen separator 22, oxygen purification device 23, hydrogen separator 32, hydrogen purification device 33, first liquid supplementing pump 53, flowmeter 54, second liquid supplementing pump 57, control module 7, first in-line alkali solution concentration sensor 8 and second in-line alkali solution concentration sensor 9 are all well-known technologies in the art, and corresponding models and power supply methods can be selected according to specific requirements during use.

[0076] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An alkaline water electrolysis hydrogen production system with automatic replenishment function, comprising an electrolyzer (1), an oxygen collection subsystem (2) and a hydrogen collection subsystem (3) connected to the electrolyzer (1), characterized in that: It also includes an alkali solution automatic supply subsystem (5), an electrolyzed water automatic supply subsystem (6) and an electrolyte concentration detection subsystem; The alkali solution automatic supply subsystem (5) is arranged at the alkali solution supply port of the electrolytic cell (1), and is connected to the oxygen collection subsystem (2) and the hydrogen collection subsystem (3) through the electrolyte collection pipeline (4); The electrolyzed water automatic supply subsystem (6) is arranged at the electrolyzed water supply port of the electrolytic cell (1); The electrolyte concentration detection subsystem is electrically connected to the electrolytic cell (1), the alkali solution automatic replenishment subsystem (5) and the electrolyzed water automatic replenishment subsystem (6) respectively.

2. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 1, characterized in that: The oxygen collection subsystem (2) comprises an oxygen collection pipeline (21), and an oxygen separator (22) and an oxygen purification device (23) arranged on the oxygen collection pipeline (21); The oxygen separator (22) is arranged at the outlet end of the oxygen collecting pipe (21), and the electrolyte discharge end of the oxygen separator (22) is connected to the electrolyte collecting pipe (4) through a first control valve (25); The oxygen purification device (23) is arranged at the oxygen discharge end of the oxygen separator (22), and an oxygen discharge pipeline (24) is arranged at the oxygen discharge end of the oxygen purification device (23), and a second control valve (26) is arranged on the oxygen discharge pipeline (24).

3. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 1, characterized in that: The hydrogen collection subsystem (3) comprises a hydrogen collection pipeline (31), and a hydrogen separator (32) and a hydrogen purification device (33) arranged on the hydrogen collection pipeline (31); The hydrogen separator (32) is arranged at the outlet end of the hydrogen collection pipeline (31), and the electrolyte discharge end of the hydrogen separator (32) is connected to the electrolyte collection pipeline (4) through a third control valve (35); The hydrogen purification device (33) is arranged at the hydrogen discharge end of the hydrogen separator (32), and a hydrogen discharge pipeline (34) is arranged at the hydrogen discharge end of the hydrogen purification device (33), and a fourth control valve (36) is arranged on the hydrogen discharge pipeline (34).

4. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 1, characterized in that: The electrolyte concentration detection subsystem comprises a control module (7), a first alkali solution online concentration sensor (8) and a second alkali solution online concentration sensor (9); The control module (7) is a computer PC terminal, the control module (7) is connected to the first alkali solution online concentration sensor (8) through a first signal circuit (71), and the control output end of the control module (7) is connected to the electrolyzed water automatic supply subsystem (6) through a first control circuit (72); The first alkali solution online concentration sensor (8) is arranged in the electrolytic cell (1); The second alkali solution online concentration sensor (9) is arranged in the alkali solution tank (51) of the alkali solution automatic replenishment subsystem (5), and is connected to the control module (7) via a second signal circuit (75).

5. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 4, characterized in that: The alkali liquid automatic replenishment subsystem (5) comprises an alkali liquid tank (51) and alkali liquid replenishment pipelines (52) symmetrically arranged on both sides of the alkali liquid tank (51); the electrolyzed water automatic replenishment subsystem (6) comprises an electrolyzed water storage tank (61) and an electrolyzed water replenishment pipeline (62), and the electrolyzed water replenishment pipeline (62) is arranged between the electrolyzed water storage tank (61) and the electrolytic cell (1).

6. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 5, characterized in that: A first replenishment pump (53), a flow meter (54) and a first check valve (55) are provided on the alkali liquid replenishment pipeline (52) and the electrolyzed water replenishment pipeline (62) between the electrolytic cell (1) and the alkali liquid tank (51); and the first replenishment pump (53) provided on the alkali liquid replenishment pipeline (52) between the electrolytic cell (1) and the alkali liquid tank (51) is connected to the control module (7) via a second control circuit (73); and the first replenishment pump (53) provided on the electrolyzed water replenishment pipeline (62) is connected to the control module (7) via a first control circuit (72).

7. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 5, characterized in that: A fifth control valve (56), a second liquid replenishment pump (57) and a second one-way valve (58) are provided on the alkali liquid replenishment pipeline (52) away from the side of the electrolytic cell (1), and the second liquid replenishment pump (57) is connected to the control module (7) via a third control circuit (74).

8. The alkaline water electrolysis hydrogen production system with automatic replenishment function as claimed in claim 5, characterized in that: The water supply port of the electrolytic water storage tank (61) is also movably provided with an insertion rod (612), which is movably arranged in the water supply pipe at the water supply port of the electrolytic water storage tank (61), a floating ball (611) is arranged at the lower end of the insertion rod (612), and a water sealing plate (613) is screwed and arranged on the outer side of the insertion rod (612) for use in conjunction with the water supply pipe at the water supply port.

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