Hydrogen generator of alkaline electrolytic cell

Abstract

The utility model relates to a hydrogen generator of an alkaline electrolytic bath, and belongs to the technical field of hydrogen production through water electrolysis. The proportional valve is mounted on a pipeline between the air tank and the oxygen gas-liquid separator; the oxygen side of the ALK electrolytic cell is connected with the oxygen gas-liquid separator, the hydrogen side of the ALK electrolytic cell is connected with the hydrogen gas-liquid separator, the air tank is connected with the oxygen gas-liquid separator, the first needle valve and the first electromagnetic valve are arranged on the gas outlet side of the oxygen gas-liquid separator, and the second needle valve and the second electromagnetic valve are arranged on the gas outlet side of the hydrogen gas-liquid separator. The proportional valve is used for accurately adjusting the air proportion to supplement air to the oxygen gas-liquid separator, and the pressure in the oxygen gas-liquid separator can be adjusted in real time, so that the water level in the ALK electrolytic cell is indirectly influenced; the combination of the first needle valve and the first solenoid valve and the combination of the second needle valve and the second solenoid valve respectively realizes the overpressure or shutdown discharge of oxygen and hydrogen, and enhances the safety and high efficiency of the hydrogen generation process.

Description

Technical Field

[0001] The utility model relates to an alkaline electrolytic cell hydrogen generator, belonging to the technical field of hydrogen production by electrolyzing water. Background Art

[0002] The working principle of the water electrolysis hydrogen production system is that a pair of electrodes immersed in an electrolyte are separated by a diaphragm to prevent gas penetration. When a certain direct current is passed, water decomposes, hydrogen is released at the cathode, and oxygen is released at the anode. Alkaline water electrolysis hydrogen production refers to the process of electrolyzing water to produce hydrogen in an alkaline electrolyte environment. The electrolyte is generally a 30% mass concentration KOH solution or a 26% mass concentration NaOH solution.

[0003] At present, the alkaline water electrolysis technology route is mature. The pressures on the oxygen side and hydrogen side of the general alkaline electrolyzer are different, which will cause the pressure on the hydrogen side to fluctuate. Hydrogen is supplied to users. Under high demand or transient load conditions, the user experience may be significantly disturbed. For example, uneven supply or sudden reduction makes it difficult for the equipment to adapt to the rapid switching state, causing usage problems. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model uses a method of replenishing air to the oxygen gas-liquid separator, which can adjust the pressure inside the oxygen gas-liquid separator in real time, thereby indirectly affecting the water level in the ALK electrolyzer. This dynamic feedback mechanism makes the hydrogen and oxygen generation and liquid level management more coordinated and the adjustment faster; the combination of the first needle valve and the first solenoid valve, and the second needle valve and the second solenoid valve respectively realizes the overpressure or shutdown discharge of oxygen and hydrogen, thereby enhancing the safety and efficiency of the hydrogen generation process.

[0005] The technical solution adopted by the utility model is an alkaline electrolytic cell hydrogen generator, comprising an ALK electrolytic cell, an oxygen gas-liquid separator, a hydrogen gas-liquid separator, an air tank, a proportional valve, a pressure sensor, a liquid level sensor, a first needle valve, a second needle valve, a first solenoid valve and a second solenoid valve; wherein the proportional valve is installed on a pipeline between the air tank and the oxygen gas-liquid separator;

[0006] ALK electrolyzer, used to electrolyze water to produce hydrogen and oxygen;

[0007] Oxygen gas-liquid separator, used to separate oxygen and water;

[0008] Hydrogen gas-liquid separator, used to separate hydrogen and water;

[0009] Pressure sensors for monitoring the pressure of oxygen gas-liquid separators and hydrogen gas-liquid separators;

[0010] Liquid level sensors for monitoring the liquid levels of oxygen gas-liquid separators and hydrogen gas-liquid separators;

[0011] Air tank, used to supply air to the oxygen gas-liquid separator to maintain pressure balance between the oxygen side and the hydrogen side;

[0012] The first needle valve and the first solenoid valve jointly control the opening or closing of the gas outlet end of the oxygen gas-liquid separator;

[0013] The second needle valve and the second solenoid valve jointly control the opening or closing of the gas outlet end of the hydrogen gas-liquid separator.

[0014] Furthermore, the oxygen side of the ALK electrolyzer is connected to the oxygen gas-liquid separator, the hydrogen side of the ALK electrolyzer is connected to the hydrogen gas-liquid separator, the air tank is connected to the oxygen gas-liquid separator, the first needle valve and the first solenoid valve are arranged on the gas outlet side of the oxygen gas-liquid separator, and the second needle valve and the second solenoid valve are arranged on the gas outlet side of the hydrogen gas-liquid separator.

[0015] Furthermore, a dryer is provided between the oxygen gas-liquid separator and the first solenoid valve.

[0016] Furthermore, a drier is provided between the hydrogen gas-liquid separator and the second solenoid valve.

[0017] Furthermore, the water inlet of the ALK electrolyzer is connected to a water replenishment tank.

[0018] Furthermore, a water replenishment pump is installed between the ALK electrolyzer and the water replenishment tank.

[0019] Furthermore, the gas outlet end of the hydrogen gas-liquid separator is connected to the user demand end through a pipeline, and a pressure reducing valve and a pressure gauge are installed on the pipeline.

[0020] Furthermore, a circulation pump and a drain valve are installed on the pipeline connecting the liquid outlet ends of the oxygen gas-liquid separator and the hydrogen gas-liquid separator and the ALK electrolyzer.

[0021] The utility model discloses an alkaline electrolyzer hydrogen generator, which has the beneficial effect of using a proportional valve to accurately adjust the air ratio to replenish the oxygen gas-liquid separator, and can adjust the pressure in the oxygen gas-liquid separator in real time, thereby indirectly affecting the water level in the ALK electrolyzer. This dynamic feedback mechanism makes the generation of hydrogen and oxygen more coordinated with the liquid level management, and the adjustment is faster; the combination of the first needle valve and the first solenoid valve, and the second needle valve and the second solenoid valve respectively realizes the overpressure or shutdown discharge of oxygen and hydrogen, and enhances the safety and efficiency of the hydrogen generation process; in addition, the configuration of the hydrogen gas-liquid separator, the oxygen gas-liquid separator and the drying tube improves the overall efficiency of the system and the purity of hydrogen. Through these improvement measures, the utility model reduces costs while maintaining excellent performance and reliability, and is suitable for a wider range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 Shown is a schematic diagram of Example 1 of the utility model.

[0024] As shown in the figure: 1. ALK electrolyzer; 2. Oxygen gas-liquid separator; 3. Hydrogen gas-liquid separator; 4. Proportional valve; 5. Pressure sensor; 6. Liquid level sensor; 7. First needle valve; 8. Second needle valve; 9. First solenoid valve; 10. Second solenoid valve; 11. Dryer; 12. Water supply tank; 13. Water supply pump; 14. Pressure reducing valve; 15. Pressure gauge; 16. Circulation pump; 17. Drain valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] In order to further understand the content of the utility model, this technical solution is further explained below in conjunction with specific implementation methods. Example

[0027] like Figure 1 As shown, this embodiment provides an alkaline electrolyzer hydrogen generator, including an ALK electrolyzer 1, an oxygen gas-liquid separator 2, a hydrogen gas-liquid separator 3, an air tank, a proportional valve 4, a pressure sensor 5, a liquid level sensor 6, a first needle valve 7, a second needle valve 8, a first solenoid valve 9 and a second solenoid valve 10; wherein the proportional valve 4 is installed on the pipeline between the air tank and the oxygen gas-liquid separator 2, and the proportional valve 4 accurately adjusts the amount of supplementary air, and can adjust the pressure in the oxygen gas-liquid separator 2 in real time, so that the pressure on the oxygen side and the hydrogen side is balanced, thereby indirectly affecting the water level in the ALK electrolyzer 1;

[0028] ALK electrolyzer 1, used to electrolyze water to produce hydrogen and oxygen;

[0029] The oxygen gas-liquid separator 2 is used to separate oxygen and water; the oxygen gas-liquid separator 2 separates oxygen and water by gravity, wherein oxygen moves toward the gas outlet side of the oxygen gas-liquid separator 2, and water moves toward the bottom of the oxygen gas-liquid separator 2;

[0030] The hydrogen gas-liquid separator 3 is used to separate hydrogen and water; the hydrogen gas-liquid separator 3 separates hydrogen and water by gravity, wherein the hydrogen moves toward the gas outlet side of the hydrogen gas-liquid separator 3, and the water moves toward the bottom of the hydrogen gas-liquid separator 3;

[0031] The water discharged from the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 is pumped back into the ALK electrolyzer 1 through the circulation pump 16;

[0032] A pressure sensor 5, used to monitor the pressure of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3;

[0033] Liquid level sensor 6, used to monitor the liquid levels of oxygen gas-liquid separator 2 and hydrogen gas-liquid separator 3;

[0034] An air tank is used to supply air to the oxygen gas-liquid separator 2 to maintain pressure balance between the oxygen side and the hydrogen side;

[0035] The first needle valve 7 and the first solenoid valve 9 jointly control the opening or closing of the gas outlet end of the oxygen gas-liquid separator 2;

[0036] The second needle valve 8 and the second solenoid valve 10 jointly control the opening or closing of the gas outlet end of the hydrogen gas-liquid separator 3 .

[0037] Specifically, the oxygen side of the ALK electrolyzer 1 is connected to the oxygen gas-liquid separator 2, the hydrogen side of the ALK electrolyzer 1 is connected to the hydrogen gas-liquid separator 3, the air tank is connected to the oxygen gas-liquid separator 2, the first needle valve 7 and the first solenoid valve 9 are arranged on the gas outlet side of the oxygen gas-liquid separator 2, and the second needle valve 8 and the second solenoid valve 10 are arranged on the gas outlet side of the hydrogen gas-liquid separator 3. A dryer 11 is arranged on the pipeline between the oxygen gas-liquid separator 2 and the first solenoid valve 9, and on the pipeline between the hydrogen gas-liquid separator 3 and the second solenoid valve 10; the combination of the first needle valve 7 and the first solenoid valve 9, and the combination of the second needle valve 8 and the second solenoid valve 10 respectively realize the overpressure or shutdown discharge of oxygen and hydrogen, and enhance the safety and efficiency of the hydrogen generation process; a circulation pump 16 and a drain valve 17 are installed on the pipeline connecting the liquid outlet end of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 to the ALK electrolyzer 1.

[0038] In addition, the water inlet end of the ALK electrolytic cell 1 is connected to the water replenishment tank 12 , and the water in the water replenishment tank 12 replenishes the ALK electrolytic cell 1 through the water replenishment pump 13 .

[0039] After the hydrogen is heated and dried by the dryer 11 , the gas outlet of the hydrogen gas-liquid separator 3 supplies gas to the user demand end along the pipeline, and a pressure reducing valve 14 and a pressure gauge 15 are installed on the pipeline.

[0040] During the specific operation, before starting, first conduct a comprehensive inspection of all pipelines and equipment to ensure that there is no gas or liquid leakage in the ALK electrolyzer 1 to avoid safety hazards; check the liquid level of the hydrogen gas-liquid separator 3 and the oxygen gas-liquid separator 2: ensure that it is within the normal range to prevent the liquid level from being too low or too high during the electrolysis process. Start the ALK electrolyzer 1. At this time, pay attention to the changes in current and voltage to ensure that they are within the set range; during the electrolysis process, the amount of hydrogen generated is twice that of oxygen, so the liquid level on the hydrogen side will be depressed due to the increased pressure caused by the large amount of hydrogen; when the liquid level on the hydrogen side and the liquid level on the oxygen side differ to the set value, the proportional valve 4 starts to work and replenishes air to the oxygen gas-liquid separator 2 to control the liquid level. The air is usually nitrogen; when the system pressure reaches the user-set value, the voltage of the ALK electrolyzer 1 power supply is reduced to standby mode. In the standby state, a small amount of gas will also be produced. Through the joint exhaust of the first solenoid valve 9, the first needle valve 7 and the second solenoid valve 10, the second needle valve 8, and the gas supply of the proportional valve 4, the liquid level difference between the hydrogen side and the oxygen side is controlled to ensure pressure stability.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An alkaline electrolyzer hydrogen generator, characterized in that: ALK electrolyzer (1), for electrolyzing water to produce hydrogen and oxygen; An oxygen gas-liquid separator (2) for separating oxygen and water; A hydrogen gas-liquid separator (3) for separating hydrogen and water; The proportional valve (4) is installed on the pipeline between the air tank and the oxygen gas-liquid separator (2); A pressure sensor (5) for monitoring the pressure of the oxygen gas-liquid separator (2) and the hydrogen gas-liquid separator (3); A liquid level sensor (6) for monitoring the liquid levels of the oxygen gas-liquid separator (2) and the hydrogen gas-liquid separator (3); An air tank, used to supply air to the oxygen gas-liquid separator (2) to maintain pressure balance between the oxygen side and the hydrogen side; The first needle valve (7) and the first solenoid valve (9) jointly control the opening or closing of the gas outlet end of the oxygen gas-liquid separator (2); The second needle valve (8) and the second solenoid valve (10) jointly control the opening or closing of the gas outlet end of the hydrogen gas-liquid separator (3).

2. The alkaline electrolyzer hydrogen generator according to claim 1, characterized in that: The oxygen side of the ALK electrolyzer (1) is connected to the oxygen gas-liquid separator (2), the hydrogen side of the ALK electrolyzer (1) is connected to the hydrogen gas-liquid separator (3), the air tank is connected to the oxygen gas-liquid separator (2), the first needle valve (7) and the first solenoid valve (9) are arranged on the gas outlet side of the oxygen gas-liquid separator (2), and the second needle valve (8) and the second solenoid valve (10) are arranged on the gas outlet side of the hydrogen gas-liquid separator (3).

3. An alkaline electrolyzer hydrogen generator according to claim 1 or 2, characterized in that: A dryer (11) is also provided between the oxygen gas-liquid separator (2) and the first electromagnetic valve (9).

4. An alkaline electrolyzer hydrogen generator according to claim 1 or 2, characterized in that: A dryer (11) is also provided between the hydrogen gas-liquid separator (3) and the second solenoid valve (10).

5. The alkaline electrolyzer hydrogen generator according to claim 1, characterized in that: The water inlet end of the ALK electrolytic cell (1) is connected to the water replenishment tank (12).

6. The alkaline electrolyzer hydrogen generator according to claim 5, characterized in that: A water replenishment pump (13) is installed between the ALK electrolytic cell (1) and the water replenishment tank (12).

7. The alkaline electrolyzer hydrogen generator according to claim 1, characterized in that: The gas outlet end of the hydrogen gas-liquid separator (3) is connected to the user demand end through a pipeline, and a pressure reducing valve (14) and a pressure gauge (15) are installed on the pipeline.

8. The alkaline electrolyzer hydrogen generator according to claim 1, characterized in that: A circulation pump (16) and a liquid discharge valve (17) are installed on the pipeline connecting the liquid outlet ends of the oxygen gas-liquid separator (2) and the hydrogen gas-liquid separator (3) with the ALK electrolyzer (1).

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