A hydrogen production system using electrolysis of water

Abstract

The utility model belongs to the field of electrolytic water hydrogen production, concretely relates to a kind of electrolytic water hydrogen production system. Including electrolytic cell, hydrogen separation mechanism, oxygen separation mechanism, hydrogen backflow buffer and oxygen backflow buffer, the gas outlet of electrolytic cell is connected hydrogen separation mechanism and oxygen separation mechanism respectively;The tail end of hydrogen separation mechanism is connected hydrogen backflow buffer by first pipeline, first check valve is provided on first pipeline, and hydrogen backflow buffer is provided with first liquid level monitoring mechanism;The tail end of oxygen separation mechanism is connected oxygen backflow buffer by second pipeline, second check valve is provided on second pipeline, and oxygen backflow buffer is provided with second liquid level monitoring mechanism.The utility model backflow buffer (hydrogen backflow buffer and oxygen backflow buffer) can quickly identify gas backflow, automatically interlock shut-off through first check valve and second check valve to prevent hydrogen or oxygen backflow, protect the safe and stable operation of hydrogen production station.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen production by water electrolysis, and specifically relates to a hydrogen production system by water electrolysis. Background Technology

[0002] Hydrogen energy has attracted attention due to its advantages such as pollution-free combustion and high calorific value.

[0003] Existing water electrolysis technology for hydrogen production is relatively mature and simple to operate, making it an important method for hydrogen production. Since water electrolysis is a process that uses electrical energy to electrolyze water to produce oxygen and hydrogen, the hydrogen production system continuously consumes raw water during operation, requiring regular replenishment to ensure continuous and safe operation. Currently, in conventional water electrolysis hydrogen production systems, hydrogen and oxygen backflow can easily occur during water replenishment, resulting in hydrogen and oxygen mixing and posing safety risks. Optimizing the water replenishment device to ensure the stable operation of the hydrogen production unit is a key research focus.

[0004] Chinese patent CN114657602B discloses a water replenishment device and method for a water electrolysis hydrogen production system; Chinese patent application CN119287393A discloses a water electrolysis hydrogen production system with cascade water replenishment and a control method; and Chinese patent application CN119307973A discloses a water electrolysis hydrogen production system equipped with a water replenishment pump.

[0005] However, the aforementioned existing technology has the following problems: (1) CN114657602B does not consider that when the water pump stops due to an accident, the pressure of the hydrogen production unit is higher than that of the water supply system. Hydrogen gas flows back to the water supply tank through the water supply pipeline. The water supply tank is an atmospheric pressure container, which then escapes into the plant and forms an explosive environment, which can easily cause an explosion accident. (2) CN119287393A only considers oxygen-side water replenishment and does not consider hydrogen-side water replenishment, which may easily cause the liquid level of the hydrogen-oxygen separator to be unbalanced; (3) CN119307973A only considers oxygen-side water replenishment, which can easily cause the liquid level of the hydrogen-oxygen separator to be unbalanced, and at the same time, it does not consider gas reflux facilities.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] To address the technical problems existing in the prior art, this utility model provides an electrolytic water hydrogen production system. The backflow buffer (hydrogen backflow buffer and oxygen backflow buffer) of this utility model can quickly identify gas backflow and automatically interlock and shut off hydrogen or oxygen backflow through the first check mechanism and the second check mechanism, thus protecting the safe and stable operation of the hydrogen production station.

[0008] This utility model includes the following technical solution: This utility model provides a water electrolysis hydrogen production system, including an electrolyzer, a hydrogen separation mechanism, an oxygen separation mechanism, a hydrogen reflux buffer, and an oxygen reflux buffer. The outlet of the electrolyzer is connected to the hydrogen separation mechanism and the oxygen separation mechanism, respectively. The tail end of the hydrogen separation mechanism is connected to the hydrogen reflux buffer through a first pipe, and a first check valve is provided on the first pipe. The hydrogen reflux buffer is provided with a first liquid level monitoring mechanism. The tail end of the oxygen separation mechanism is connected to the oxygen reflux buffer through a second pipe, and a second check valve is provided on the second pipe. The oxygen reflux buffer is provided with a second liquid level monitoring mechanism.

[0009] Furthermore, the first check mechanism includes a first check valve, a first programmable valve, and a second check valve on the first pipeline.

[0010] Furthermore, the first check valve, the first programmable valve, and the second check valve are arranged sequentially.

[0011] Furthermore, the second check mechanism includes a third check valve, a second programmable valve, and a fourth check valve on the second pipeline.

[0012] Furthermore, the third check valve, the second programmable valve, and the fourth check valve are arranged sequentially.

[0013] Furthermore, it also includes a water replenishment mechanism, which includes a water replenishment pump, the outlet of which is connected to the hydrogen reflux buffer and the oxygen reflux buffer, respectively.

[0014] Furthermore, the water replenishment mechanism also includes a self-regulating valve, one end of which is connected to the inlet of the water replenishment pump via a pipe, and the other end of which is connected to the outlet of the water replenishment pump via a pipe.

[0015] Furthermore, the first liquid level monitoring mechanism is a remote liquid level gauge; and / or the second liquid level monitoring mechanism is a remote liquid level gauge.

[0016] Furthermore, the hydrogen separation mechanism includes a hydrogen separator and a hydrogen scrubber. The electrolytic cell is connected to the inlet of the hydrogen separator, the gas phase outlet of the hydrogen separator is connected to the inlet of the hydrogen scrubber, the bottom of the hydrogen scrubber is connected to the hydrogen reflux buffer, and the bottom liquid phase outlet of the hydrogen scrubber is connected to the hydrogen separator. The oxygen separation mechanism includes an oxygen separator and an oxygen scrubber. The electrolytic cell is connected to the inlet of the oxygen separator, the gas outlet of the oxygen separator is connected to the inlet of the oxygen scrubber, the bottom of the oxygen scrubber is connected to the oxygen reflux buffer, and the bottom liquid phase outlet of the oxygen scrubber is connected to the oxygen separator.

[0017] Furthermore, the liquid phase outlet of the hydrogen separator is connected to the electrolytic cell via an alkaline solution circulation pump; the bottom of the oxygen separator is connected to the electrolytic cell via an alkaline solution circulation pump.

[0018] By adopting the above technical solution, this utility model has the following advantages: 1. The backflow buffer (hydrogen backflow buffer and oxygen backflow buffer) of this utility model can quickly identify gas backflow and automatically shut off hydrogen or oxygen backflow through the first check mechanism and the second check mechanism, thus protecting the safe and stable operation of the hydrogen production station.

[0019] 2. This utility model can realize the round-robin water replenishment of the hydrogen side and oxygen side of the hydrogen production system, thus protecting the safe and stable operation of the hydrogen production station.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a water electrolysis hydrogen production system according to an embodiment of the present invention; In the diagram, 10-electrolyzer, 20-hydrogen separation mechanism, 21-hydrogen separator, 22-hydrogen scrubber, 30-oxygen separation mechanism, 31-oxygen separator, 32-oxygen scrubber, 40-hydrogen reflux buffer, 50-oxygen reflux buffer, 60-first check valve mechanism, 61-first check valve, 62-first programmable valve, 63-second check valve, 70-first liquid level monitoring mechanism, 80-second check valve mechanism, 81-third check valve, 82-second programmable valve, 83-fourth check valve, 90-second liquid level monitoring mechanism, 100-water replenishment pump, 110-self-regulating valve, 120-alkali circulation pump. Detailed Implementation

[0023] The following description provides many different embodiments or examples for implementing various features of the present invention. The elements and arrangements described in the specific examples below are only for concise expression of the present invention and are merely examples, not intended to limit the present invention.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] This embodiment provides a water electrolysis hydrogen production system, such as... Figure 1 As shown, the system includes an electrolytic cell 10, a hydrogen separation mechanism 20, an oxygen separation mechanism 30, a hydrogen reflux buffer 40, and an oxygen reflux buffer 50. The outlet of the electrolytic cell 10 is connected to the hydrogen separation mechanism 20 and the oxygen separation mechanism 30, respectively. The tail end of the hydrogen separation mechanism 20 is connected to the hydrogen reflux buffer 40 through a first pipe, on which a first check valve 60 is provided. The hydrogen reflux buffer 40 is provided with a first liquid level monitoring mechanism 70. The tail end of the oxygen separation mechanism 30 is connected to the oxygen reflux buffer 50 through a second pipe, on which a second check valve 80 is provided. The oxygen reflux buffer 50 is provided with a second liquid level monitoring mechanism 90.

[0026] In some embodiments, the first check valve 60 includes a first check valve 61, a first programmable valve 62, and a second check valve 63 on the first pipeline. The reliability of the check valve is increased by providing dual check valves.

[0027] In some embodiments, the second check mechanism 80 includes a third check valve 81, a second programmable valve 82, and a fourth check valve 83 on the second pipeline. The reliability of the check valve is increased by providing dual check valves.

[0028] Preferably, the check valves on the hydrogen side (first check valve 61, second check valve 63) and the check valves on the oxygen side (third check valve 81, fourth check valve 83) are valves with different check valve types; at the same time, the third check valve 81 and the fourth check valve 83 on the oxygen side are valves with different check valve types, and the check valves should be installed vertically or horizontally according to the safety valve installation requirements.

[0029] In some embodiments, the first check valve 61, the first programmable valve 62, and the second check valve 63 are arranged sequentially. The hydrogen backflow buffer 40 is equipped with a first liquid level monitoring mechanism 70 (remote liquid level gauge) and interlocked with the first programmable valve 62. When the liquid level changes, the first programmable valve 62 shuts off to stop the hydrogen-side water replenishment.

[0030] In some embodiments, the third check valve 81, the second programmable valve 82, and the fourth check valve 83 are arranged sequentially. The oxygen backflow buffer 50 is equipped with a second liquid level mechanism (remote liquid level gauge) and interlocked with the oxygen-side programmable valve. When the liquid level changes, the oxygen-side programmable valve is shut off to stop oxygen-side water replenishment.

[0031] When this novel hydrogen production system is in operation, the first programmable valve 62 and the second programmable valve 82 are controlled sequentially or in conjunction with the liquid levels of the hydrogen separator 21 and the oxygen separator 31. The liquid level interlock controls the water replenishment of the hydrogen production system.

[0032] In some embodiments, a water replenishment mechanism is also included, which includes a water replenishment pump 100, the outlet of which is connected to the hydrogen reflux buffer 40 and the oxygen reflux buffer 50, respectively.

[0033] In some embodiments, the water replenishment mechanism further includes a self-regulating valve 110, one end of which is connected to the inlet of the water replenishment pump 100 via a pipe, and the other end of which is connected to the outlet of the water replenishment pump 100 via a pipe. During the water replenishment process, the outlet pressure of the water replenishment pump 100 decreases, and the self-regulating valve 110 adjusts the return water volume. When water replenishment stops, the outlet pressure of the water replenishment pump 100 increases, and the self-regulating valve 110 fully opens, achieving full return flow.

[0034] Preferably, the water supply pump 100 is in hot standby mode, and when no water is being supplied, full reflux is achieved through the self-regulating valve 110.

[0035] In some embodiments, the first liquid level monitoring mechanism 70 is a remote liquid level gauge; and / or the second liquid level monitoring mechanism 90 is a remote liquid level gauge.

[0036] In some embodiments, the hydrogen separation mechanism 20 includes a hydrogen separator 21 and a hydrogen scrubber 22. The electrolytic cell 10 is connected to the inlet of the hydrogen separator 21, the gas phase outlet of the hydrogen separator 21 is connected to the inlet of the hydrogen scrubber 22, the bottom of the hydrogen scrubber 22 is connected to the hydrogen reflux buffer 40, and the bottom liquid phase outlet of the hydrogen scrubber 22 is connected to the hydrogen separator 21. The oxygen separation mechanism 30 includes an oxygen separator 31 and an oxygen scrubber 32. The electrolytic cell 10 is connected to the inlet of the oxygen separator 31, the gas outlet of the oxygen separator 31 is connected to the inlet of the oxygen scrubber 32, the bottom of the oxygen scrubber 32 is connected to the oxygen reflux buffer 50, and the bottom liquid phase outlet of the oxygen scrubber 32 is connected to the oxygen separator 31.

[0037] In some embodiments, the liquid phase outlet of the hydrogen separator 21 is connected to the electrolytic cell 10 via an alkaline circulation pump 120; the bottom of the oxygen separator 31 is connected to the electrolytic cell 10 via an alkaline circulation pump 120.

[0038] In some embodiments, both the hydrogen backflow buffer 40 and the oxygen backflow buffer 50 are installed vertically and are placed as close as possible to their corresponding hydrogen scrubber or oxygen scrubber.

[0039] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that, The device includes an electrolytic cell (10), a hydrogen separation mechanism (20), an oxygen separation mechanism (30), a hydrogen reflux buffer (40), and an oxygen reflux buffer (50). The outlet of the electrolytic cell (10) is connected to the hydrogen separation mechanism (20) and the oxygen separation mechanism (30), respectively. The tail end of the hydrogen separation mechanism (20) is connected to the hydrogen reflux buffer (40) through a first pipe. A first check valve (60) is provided on the first pipe. A first liquid level monitoring mechanism (70) is provided on the hydrogen reflux buffer (40). The tail end of the oxygen separation mechanism (30) is connected to the oxygen reflux buffer (50) through a second pipe. A second check valve (80) is provided on the second pipe. A second liquid level monitoring mechanism (90) is provided on the oxygen reflux buffer (50).

2. The water electrolysis hydrogen production system according to claim 1, characterized in that, The first check mechanism (60) includes a first check valve (61), a first programmable valve (62), and a second check valve (63) on the first pipeline.

3. The water electrolysis hydrogen production system according to claim 2, characterized in that, The first check valve (61), the first programmable valve (62), and the second check valve (63) are arranged in sequence.

4. The water electrolysis hydrogen production system according to claim 1, characterized in that, The second check mechanism (80) includes a third check valve (81), a second programmable valve (82), and a fourth check valve (83) on the second pipeline.

5. The water electrolysis hydrogen production system according to claim 4, characterized in that, The third check valve (81), the second programmable valve (82), and the fourth check valve (83) are arranged in sequence.

6. A water electrolysis hydrogen production system according to any one of claims 1-5, characterized in that, It also includes a water replenishment mechanism, which includes a water replenishment pump (100), the outlet of which is connected to the hydrogen reflux buffer (40) and the oxygen reflux buffer (50), respectively.

7. The water electrolysis hydrogen production system according to claim 6, characterized in that, The water replenishment mechanism also includes a self-regulating valve (110), one end of which is connected to the inlet of the water replenishment pump (100) through a pipe, and the other end is connected to the outlet of the water replenishment pump (100) through a pipe.

8. The water electrolysis hydrogen production system according to claim 1, characterized in that, The first liquid level monitoring mechanism (70) is a remote liquid level gauge; and / or the second liquid level monitoring mechanism (90) is a remote liquid level gauge.

9. The water electrolysis hydrogen production system according to claim 1, characterized in that, The hydrogen separation mechanism (20) includes a hydrogen separator (21) and a hydrogen scrubber (22). The electrolytic cell (10) is connected to the inlet of the hydrogen separator (21). The gas phase outlet of the hydrogen separator (21) is connected to the inlet of the hydrogen scrubber (22). The bottom of the hydrogen scrubber (22) is connected to the hydrogen backflow buffer (40), and the liquid phase outlet at the bottom of the hydrogen scrubber (22) is connected to the hydrogen separator (21). The oxygen separation mechanism (30) includes an oxygen separator (31) and an oxygen scrubber (32). The electrolytic cell (10) is connected to the inlet of the oxygen separator (31). The gas outlet of the oxygen separator (31) is connected to the inlet of the oxygen scrubber (32). The bottom of the oxygen scrubber (32) is connected to the oxygen backflow buffer (50), and the liquid phase outlet at the bottom of the oxygen scrubber (32) is connected to the oxygen separator (31).

10. A water electrolysis hydrogen production system according to claim 9, characterized in that, The liquid phase outlet of the hydrogen separator (21) is connected to the electrolytic cell (10) via an alkaline circulation pump (120); the bottom of the oxygen separator (31) is connected to the electrolytic cell (10) via an alkaline circulation pump (120).

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