Hydrogen purification and water removal device and control method thereof

Abstract

The invention discloses a hydrogen purification and water removal device and a control method thereof.The hydrogen purification and water removal device comprises a deoxidation system, a heat dissipation system, a first gas-water separation tank and a second gas-water separation tank, the deoxidation system is a deoxidation tank, a deoxidation catalyst is injected into the deoxidation tank, and the deoxidation catalyst is communicated between the deoxidation system and the first gas-water separation tank; a first drop catching net is arranged in the first gas-water separation tank, a second drop catching net is arranged in the second gas-water separation tank, the second gas-water separation tank is communicated with the deoxidation system, and the first gas-water separation tank is communicated with the second gas-water separation tank; according to the device, trace oxygen and moisture in crude hydrogen produced by hydrogen production through water electrolysis are removed, meanwhile, the height of liquid water in the device is monitored in real time through the liquid level sensor, discharge of the liquid water is automatically controlled, and the device utilizes the effect of pressure difference on the liquid level height of the water and a water sealing effect on hydrogen to prevent hydrogen leakage.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen purification, and in particular to a hydrogen purification and water removal device and a control method thereof. Background Art

[0002] With the transformation of the global energy structure and the changes in the earth's environmental conditions, the demand for clean energy and renewable energy is increasing day by day. Hydrogen energy has become the focus of research and development in various countries. The water electrolysis hydrogen production technology has broad application prospects because it can produce clean and renewable hydrogen energy.

[0003] Different fields have different requirements for hydrogen purity. In the production of synthetic ammonia and methanol, in order to prevent catalyst poisoning and ensure product quality, sulfides and other poisons in the raw gas must be removed in advance to reduce the impurity content to meet the requirements. In the field of fuel cells, the purity requirements for hydrogen are higher, usually need to reach more than 99.99%, in order to meet the efficient and stable operation of fuel cells;

[0004] For example, the instruction manual Figure 2 As shown, the device includes two gas-water separation systems, a catalytic deoxygenation system and a heat dissipation system. Each gas-water separation system includes a gas-water separation tank, a liquid level sensor and a drain solenoid valve. At present, this type of purification and dehydration equipment actually works with two gas-water separation systems. The existing technology requires the use of multiple liquid level sensors and drain solenoid valves to separate gas and water, which not only increases the comprehensive cost of the equipment, but also the hydrogen produced by the electrolysis of water hydrogen production process has a high purity, but may still contain trace impurities and a large amount of water. Therefore, it is necessary to further remove impurities and water through purification technology to improve its purity to meet the application needs of different fields. Summary of the invention

[0005] The object of the present invention is to provide a hydrogen purification and water removal device and a control method thereof to solve the related problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a hydrogen purification and water removal device, comprising a deoxygenation system, a heat dissipation system, a first gas-water separation tank and a second gas-water separation tank, wherein the deoxygenation system is a deoxygenation tank, and a deoxygenation catalyst is injected into the deoxygenation tank, the deoxygenation system and the first gas-water separation tank are connected with the deoxygenation catalyst, a first dripping net is provided inside the first gas-water separation tank, a second dripping net is provided inside the second gas-water separation tank, the second gas-water separation tank and the deoxygenation system are connected with each other, the first gas-water separation tank and the second gas-water separation tank are connected with each other, and a drainage solenoid valve is connected at the bottom of the first gas-water separation tank.

[0007] Preferably, a liquid level sensor is provided on one side of the first gas-water separation tank, and the interior of the first gas-water separation tank includes a high liquid level, a middle liquid level and a low liquid level.

[0008] Preferably, the top of the second gas-water separation tank is connected to a hydrogen inlet, the top of the first gas-water separation tank is connected to a hydrogen outlet, and a pressure sensor is provided on one side of the second gas-water separation tank.

[0009] Preferably, a temperature sensor is provided on one side of the deoxygenation tank of the deoxygenation system.

[0010] Preferably, a connecting pipe which is interconnected is provided between the first gas-water separation tank and the second gas-water separation tank, and the connecting pipe is located at the bottom of one side of the first gas-water separation tank and the second gas-water separation tank.

[0011] Preferably, the bottom of the second gas-water separation tank is higher than or flush with the bottom of the first gas-water separation tank.

[0012] Preferably, the first dripping net is arranged at the top inside the first gas-water separation tank, and the second dripping net is arranged at the top inside the second gas-water separation tank.

[0013] The present invention also includes a control method for a hydrogen purification and water removal device, and the control method steps are as follows:

[0014] Step 1: When the device is operating at rated conditions, the maximum pressure difference between the second steam-water separation tank and the first gas-water separation tank is about 5 kPa, so the liquid level of the second steam-water separation tank is about 50 cm lower than that of the first gas-water separation tank. When hydrogen enters the purification device from the hydrogen inlet of the first gas-water separation tank, it is cooled at the second steam-water separation tank to precipitate a portion of liquid water;

[0015] Step 2: Remove trace oxygen in hydrogen by heating and deoxidizing the hydrogen into a deoxidation system;

[0016] Step 3: After the hydrogen is deoxygenated, the hydrogen is passed through a deoxygenation catalyst for heat dissipation and cooling, and then enters the first gas-water separation tank for cooling again, and a portion of liquid water is separated again;

[0017] Step 4: The bottom of the first gas-water separation tank is connected to the bottom of the second gas-water separation tank. When the collected liquid water level exceeds the middle liquid level of the first gas-water separation tank, the drain solenoid valve is opened to automatically drain the water. When the liquid level is lower than the middle liquid level, the drain solenoid valve is closed with a delay.

[0018] Step 5. During the drainage operation of the drain solenoid valve, if the drain solenoid valve fails and cannot drain water normally, when the liquid level accumulates to a high level, a high liquid level alarm is triggered, and the alarm signal is uploaded to the upper-level control system for fault shutdown processing.

[0019] Compared with the prior art, the present invention provides a hydrogen purification and water removal device, which has the following beneficial effects:

[0020] 1. The present invention removes trace oxygen and moisture from crude hydrogen produced by electrolyzing water to produce hydrogen, and monitors the height of liquid water in the device in real time through a liquid level sensor to automatically control the discharge of liquid water. The device uses the effect of pressure difference on the liquid level of water to produce a water seal for hydrogen to prevent hydrogen leakage.

[0021] 2. The present invention purifies and removes water by connecting the first gas-water separation tank and the second gas-water separation tank. Compared with the original device, the process flow is optimized and a new gas-water separation system is designed. Compared with the original device, one liquid level sensor and one drain solenoid valve are missing, which greatly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the hydrogen purification and water removal system of the present invention;

[0023] Figure 2 It is a schematic diagram of the existing hydrogen purification and water removal system of the present invention.

[0024] In the figure: 1. Deoxygenation system; 2. Deoxygenation catalyst; 3. Heat dissipation system; 4. First dripping net; 5. First gas-water separation tank; 6. Drain solenoid valve; 7. Second gas-water separation tank; 8. Second dripping net. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-2 The present invention provides a technical solution: a hydrogen purification and water removal device, comprising a deoxygenation system 1, a heat dissipation system 3, a first gas-water separation tank 5 and a second gas-water separation tank 7, wherein the deoxygenation system 1 is a deoxygenation tank, and a deoxygenation catalyst 2 is injected into the deoxygenation tank, the deoxygenation system 1 and the first gas-water separation tank 5 are connected with the deoxygenation catalyst 2, a first dripping net 4 is arranged inside the first gas-water separation tank 5, a second dripping net 8 is arranged inside the second gas-water separation tank 7, the second gas-water separation tank 7 and the deoxygenation system 1 are connected with each other, the first gas-water separation tank 5 and the second gas-water separation tank 7 are connected with each other, and a drainage solenoid valve 6 is connected at the bottom of the first gas-water separation tank 5.

[0027] As a preferred solution of this embodiment: a liquid level sensor is provided on one side of the first gas-water separation tank 5, and the interior of the first gas-water separation tank 5 includes high liquid level, middle liquid level and low liquid level, so as to facilitate the control of high, medium and low liquid levels to promote the precipitation of liquid water in the separation tank.

[0028] As a preferred solution of this embodiment: the top of the second gas-water separation tank 7 is connected to a hydrogen inlet, the top of the first gas-water separation tank 5 is connected to a hydrogen outlet, and a pressure sensor is provided on one side of the second gas-water separation tank 7 to facilitate the introduction of hydrogen into the second gas-water separation tank 7 and discharge from the first gas-water separation tank 5.

[0029] As a preferred solution of this embodiment: a temperature sensor is provided on one side of the deoxygenation tank of the deoxygenation system 1 to facilitate temperature sensing of the deoxygenation tank of the deoxygenation system 1 to avoid the deoxygenation effect of hydrogen being affected by the working temperature not meeting the standard.

[0030] As a preferred solution of this embodiment: a connecting pipe that is interconnected is provided between the first gas-water separation tank 5 and the second steam-water separation tank 7, and the connecting pipe is located at the bottom of one side of the first gas-water separation tank 5 and the second steam-water separation tank 7, so as to facilitate the connection between the separation tanks and facilitate the drainage by opening the drainage solenoid valve 6.

[0031] As a preferred solution of this embodiment: the bottom position of the second steam-water separation tank 7 is higher than or flush with the bottom of the first gas-water separation tank 5, so as to avoid the liquid level of the second steam-water separation tank 7 being set too high than the first gas-water separation tank 5, resulting in the inability of the liquid to circulate within the tube body.

[0032] As a preferred solution of this embodiment: the first dripping net 4 is arranged at the top inside the first gas-water separation tank 5, and the second dripping net 8 is arranged at the top inside the second gas-water separation tank 7. The arrangement of the dripping nets improves the gas-liquid separation processing efficiency.

[0033] Working principle: A control method for a hydrogen purification and water removal device, the control method steps are as follows:

[0034] Step 1: When the device is operating at rated conditions, the maximum pressure difference between the second steam-water separation tank 7 and the first gas-water separation tank 5 is about 5 kPa, so the liquid level of the second steam-water separation tank 7 is about 50 cm lower than the liquid level of the first gas-water separation tank 5. When hydrogen enters the purification device from the hydrogen inlet of the first gas-water separation tank 5, it is cooled at the second steam-water separation tank 7 to precipitate a portion of liquid water;

[0035] Step 2: heating and deoxidizing the hydrogen by introducing the hydrogen into the deoxidation system 1 to remove trace oxygen in the hydrogen;

[0036] Step 3: After the hydrogen is deoxygenated, the hydrogen passes through the deoxygenation catalyst 2 for heat dissipation and cooling, and then enters the first gas-water separation tank 5 for cooling again, and a portion of liquid water is separated again;

[0037] Step 4: The first gas-water separation tank 5 is connected to the bottom of the second gas-water separation tank 7. When the collected liquid water level exceeds the middle liquid level of the first gas-water separation tank 5, the drain solenoid valve 6 is opened to automatically drain the water. When the liquid level is lower than the middle liquid level, the drain solenoid valve 6 is closed with a delay.

[0038] Step 5: During the drainage operation of the drainage solenoid valve 6, if the drainage solenoid valve 6 fails and cannot drain water normally, when the liquid level accumulates to a high level, a high liquid level alarm is triggered, and the alarm signal is uploaded to the upper-level control system for fault shutdown processing.

[0039] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A hydrogen purification and water removal device, characterized in that: The invention comprises a deoxygenation system (1), a heat dissipation system (3), a first gas-water separation tank (5) and a second gas-water separation tank (7); the deoxygenation system (1) is a deoxygenation tank, and a deoxygenation catalyst (2) is injected into the deoxygenation tank; the deoxygenation catalyst (2) is connected between the deoxygenation system (1) and the first gas-water separation tank (5); a first dripping net (4) is provided inside the first gas-water separation tank (5); a second dripping net (8) is provided inside the second gas-water separation tank (7); the second gas-water separation tank (7) and the deoxygenation system (1) are connected to each other; the first gas-water separation tank (5) and the second gas-water separation tank (7) are connected to each other; and a drainage solenoid valve (6) is connected to the bottom of the first gas-water separation tank (5).

2. A hydrogen purification and water removal device according to claim 1, characterized in that: A liquid level sensor is provided on one side of the first gas-water separation tank (5), and the interior of the first gas-water separation tank (5) includes a high liquid level, a middle liquid level and a low liquid level.

3. A hydrogen purification and water removal device according to claim 1, characterized in that: The top of the second gas-water separation tank (7) is connected to a hydrogen inlet, the top of the first gas-water separation tank (5) is connected to a hydrogen outlet, and a pressure sensor is provided on one side of the second gas-water separation tank (7).

4. A hydrogen purification and water removal device according to claim 1, characterized in that: A temperature sensor is provided on one side of the deoxygenation tank of the deoxygenation system (1).

5. A hydrogen purification and water removal device according to claim 1, characterized in that: A connecting pipe that communicates with each other is provided between the first gas-water separation tank (5) and the second steam-water separation tank (7), and the connecting pipe is located at the bottom of one side of the first gas-water separation tank (5) and the second steam-water separation tank (7).

6. A hydrogen purification and water removal device according to claim 1, characterized in that: The bottom of the second gas-water separation tank (7) is higher than or flush with the bottom of the first gas-water separation tank (5).

7. A hydrogen purification and water removal device according to claim 1, characterized in that: The first dripping net (4) is arranged at the top of the first gas-water separation tank (5), and the second dripping net (8) is arranged at the top of the second gas-water separation tank (7).

8. A control method for a hydrogen purification and water removal device, comprising a hydrogen purification and water removal device as claimed in any one of claims 1 to 7, wherein the control method comprises the following steps: Step 1: When the device is operating at rated conditions, the maximum pressure difference between the second steam-water separation tank (7) and the first gas-water separation tank (5) is about 5 kPa, so the liquid level of the second steam-water separation tank (7) is about 50 cm lower than the liquid level of the first gas-water separation tank (5). When hydrogen enters the purification device from the hydrogen inlet of the first gas-water separation tank (5), it is cooled at the second steam-water separation tank (7) to precipitate a portion of liquid water; Step 2: removing trace oxygen in the hydrogen by heating and deoxidizing the hydrogen by introducing the hydrogen into the deoxidation system (1); Step 3: After the hydrogen is deoxygenated, the hydrogen passes through the deoxygenation catalyst (2) to dissipate heat and cool, and then enters the first gas-water separation tank (5) to be cooled again, and a portion of liquid water is separated again; Step 4: The first gas-water separation tank (5) is connected to the bottom of the second gas-water separation tank (7). When the level of the collected liquid water exceeds the middle liquid level of the first gas-water separation tank (5), the drain solenoid valve (6) is opened to automatically drain the water. When the liquid level is lower than the middle liquid level, the drain solenoid valve (6) is closed with a delay. Step 5: During the drainage operation of the drainage solenoid valve (6), if the drainage solenoid valve (6) fails and cannot drain water normally, when the liquid level accumulates to a high level, a high liquid level alarm is triggered, and the alarm signal is uploaded to the upper-level control system for fault shutdown processing.

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