Hydrogen water-saving and emission-reducing washing system

Abstract

The utility model relates to the technical field of hydrogen treatment, in particular to a hydrogen water-saving and emission-reducing washing system, which comprises a hydrogen production electrolytic bath, a hydrogen washing tower, a hydrogen compressor, a hydrogen cooler and a water mist catcher which are sequentially communicated, and the bottom of the hydrogen washing tower is communicated with a washing liquid circulating pump. The pumping-out end of the washing liquid circulating pump is communicated with a spraying head at the top of the hydrogen washing tower, cooling water return pipes are arranged between the hydrogen cooler and the gas-liquid separator of the hydrogen compressor and between the water mist catcher and the gas-liquid separator of the hydrogen compressor in a communicating mode, and the gas-liquid separator of the hydrogen compressor is provided with a water storage tank in a communicating mode. A water conveying pipe is arranged between the water storage tank and the hydrogen washing tower in a communicating manner, and a water conveying valve is arranged on the water conveying pipe. According to the hydrogen treatment device, water resource waste generated in the hydrogen treatment process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen treatment, in particular to a hydrogen water-saving and emission-reducing washing system. Background Technique

[0002] Electrolytic hydrogen production is a process that uses electrical energy to decompose water into hydrogen and oxygen. Direct current is passed through an electrolytic cell filled with electrolyte, and water molecules undergo an electrochemical reaction on the electrodes, thus decomposing into hydrogen and oxygen.

[0003] The hydrogen produced by the electrolysis device needs to go through a washing process. Usually, a hydrogen washing tower is used to wash the hydrogen. The main function of the hydrogen washing tower is to remove the alkali mist and moisture in the hydrogen, and the washing is carried out by spraying. This washing process not only helps to remove the alkali mist and most of the moisture in the hydrogen, but also can reduce the temperature of the hydrogen. The hydrogen washed by the hydrogen washing tower usually also passes through a hydrogen compressor for compression. The compressed hydrogen then passes through a hydrogen cooler and a water mist catcher in sequence. The hydrogen cooler can further cool down the hydrogen, and the catcher can further remove the mist droplets in the hydrogen for the use of subsequent processes.

[0004] In the related technology, during the process of compressing wet hydrogen by the hydrogen compressor, heat generated by compressing the hydrogen will take away a part of the moisture. The cooling water formed after cooling down this part of the moisture through the hydrogen cooler and the water mist catcher is usually discharged into the trench by the factory, resulting in waste of water resources. Content of the Utility Model

[0005] The purpose of the utility model is to provide a hydrogen water-saving and emission-reducing washing system to solve the problem of waste of water resources generated during the process of treating hydrogen.

[0006] The utility model is realized by the following technical solutions:

[0007] A hydrogen water-saving and emission-reducing washing system, the washing system includes a hydrogen production electrolytic cell, a hydrogen washing tower, a hydrogen compressor, a hydrogen cooler and a water mist catcher which are connected in sequence. A washing liquid circulation pump is connected at the bottom of the hydrogen washing tower. The pump outlet end of the washing liquid circulation pump is connected to the spray head at the top of the hydrogen washing tower. A cooling water return pipe is connected between the hydrogen cooler and the water mist catcher and the gas-liquid separator of the hydrogen compressor. A water storage tank is connected to the gas-liquid separator of the hydrogen compressor. A water delivery pipe is connected between the water storage tank and the hydrogen washing tower, and a water delivery valve is arranged on the water delivery pipe.

[0008] Further, a drain pipe is connected between the gas-liquid separator of the hydrogen compressor and the water storage tank. A drain valve is provided on the drain pipe. Both the drain valve and the water supply valve are liquid level regulating valves. The drain valve is used to control the liquid level inside the gas-liquid separator above the water inlet end of the drain pipe, and the water supply valve is used to control the liquid level in the water storage tank.

[0009] Further, a washing liquid cooler is connected to the pump outlet end of the washing liquid circulation pump. The washing liquid cooler is connected to the spray head at the top of the hydrogen washing tower.

[0010] Further, a hydrogen buffer tank is connected to the gas outlet end of the water mist catcher. A gas transmission pipe is connected to the hydrogen buffer tank. One end of the gas transmission pipe away from the hydrogen buffer tank is connected to a hydrogen venting tank. A gas transmission valve is provided on the gas transmission pipe.

[0011] Further, an inlet pipe is connected between the hydrogen production electrolytic cell and the hydrogen washing tower. A hydrogen water seal tank is provided on the inlet pipe.

[0012] Further, a washing liquid delivery pipe is connected to the pump outlet end of the washing liquid circulation pump. The washing liquid delivery pipe is connected to the washing liquid cooler. A washing liquid distribution pipe is connected to the washing liquid delivery pipe. One end of the washing liquid distribution pipe away from the washing liquid delivery pipe is connected to the hydrogen production electrolytic cell. A distribution valve is provided on the washing liquid distribution pipe.

[0013] Further, the distribution valve is a liquid level regulating valve, and the distribution valve is used to control the liquid level of the washing liquid inside the hydrogen washing tower.

[0014] Further, a hydrogen circulation pipe is connected between the gas outlet end of the hydrogen buffer tank and the inlet pipe. A circulation valve is provided on the hydrogen circulation pipe.

[0015] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0016] 1. The hydrogen produced by the hydrogen production electrolyzer is transported into the hydrogen scrubbing tower. The scrubbing liquid circulation pump pumps the scrubbing liquid in the hydrogen scrubbing tower to the top of the hydrogen scrubbing tower to spray and wash the internal hydrogen. The washed hydrogen enters the hydrogen compressor for compression. The compressed hydrogen successively enters the hydrogen cooler and the water mist trap. The hydrogen cooler further cools the hydrogen, and the water mist trap removes the mist droplets in the hydrogen. The moisture in the hydrogen will condense into liquid cooling water in the hydrogen cooler and the water mist trap. The cooling water is transported through the cooling water return pipe to the gas-liquid separator of the hydrogen compressor for temporary storage. The water in the gas-liquid separator can be discharged into the water storage tank for storage. When there is more water in the water storage tank, the water supply valve is opened, and the water in the water storage tank can be transported through the water supply pipe to the hydrogen scrubbing tower. On the one hand, it can be used to supplement the scrubbing liquid in the hydrogen scrubbing tower, and on the other hand, it can also reduce the waste of water resources;

[0017] 2. In actual industrial production, although hydrogen is insoluble in water, there will always be a very small amount of hydrogen leaking out along the drain port during the process of discharging the scrubbing liquid cooling water to the outside, which poses a safety risk because hydrogen belongs to Class A flammable and explosive gases. In this solution, since the hydrogen scrubbing liquid is not discharged to the outside, zero drainage of hydrogen treatment can be achieved, which can reduce the possibility of hydrogen leakage;

[0018] 3. The excess scrubbing liquid in the hydrogen scrubbing tower can also be transported into the hydrogen production electrolyzer for use in electrolytic hydrogen production, which can reduce the use of other water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention.

[0020] In the drawings:

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] The reference numerals in the drawings and the corresponding component names:

[0023] 1. Hydrogen production electrolyzer; 2. Hydrogen scrubbing tower; 3. Hydrogen compressor; 4. Hydrogen cooler; 5. Water mist trap; 6. Scrubbing liquid circulation pump; 7. Cooling water return pipe; 8. Water storage tank; 9. Water supply pipe; 10. Water supply valve; 11. Drain pipe; 12. Drain valve; 13. Scrubbing liquid cooler; 14. Hydrogen buffer tank; 15. Gas transmission pipe; 16. Hydrogen venting tank; 17. Gas transmission valve; 18. Inlet pipe; 19. Hydrogen water seal tank; 20. Scrubbing liquid transmission pipe; 21. Scrubbing liquid distribution pipe; 22. Distribution valve; 23. Hydrogen circulation pipe; 24. Circulation valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments of the present utility model and their descriptions are only used to explain the present utility model and do not limit the present utility model. It should be noted that the present utility model has been in the actual R & D and use stage.

[0025] Embodiment 1

[0026] A hydrogen-saving and emission-reducing washing system, referring to Figure 1 , the washing system includes a hydrogen production electrolytic cell 1, a hydrogen washing tower 2, a hydrogen compressor 3, a hydrogen cooler 4 and a water mist catcher 5 which are connected in sequence. A washing liquid circulation pump 6 is connected to the bottom of the hydrogen washing tower 2. The pump outlet of the washing liquid circulation pump 6 is connected to the spray head at the top of the hydrogen washing tower 2. A cooling water return pipe 7 is connected between the hydrogen cooler 4 and the water mist catcher 5 and the gas-liquid separator of the hydrogen compressor 3. A water storage tank 8 is connected to the gas-liquid separator of the hydrogen compressor 3. A water delivery pipe 9 is connected between the water storage tank 8 and the hydrogen washing tower 2. A water delivery valve 10 is arranged on the water delivery pipe 9.

[0027] In this solution, the hydrogen produced by the hydrogen production electrolytic cell 1 is transported into the hydrogen washing tower 2. The washing liquid circulation pump 6 pumps the washing liquid in the hydrogen washing tower 2 to the top of the hydrogen washing tower 2 to spray and wash the hydrogen inside. The washed hydrogen enters the hydrogen compressor 3 for compression. The compressed hydrogen enters the hydrogen cooler 4 and the water mist catcher 5 in sequence. The hydrogen cooler 4 further cools the hydrogen, and the water mist catcher 5 removes the mist droplets in the hydrogen. The water in the hydrogen will condense into liquid cooling water in the hydrogen cooler 4 and the water mist catcher 5. The cooling water is transported to the gas-liquid separator of the hydrogen compressor 3 through the cooling water return pipe 7 for temporary storage. The water in the gas-liquid separator can be discharged into the water storage tank 8 for storage. When there is more water in the water storage tank 8, the water delivery valve 10 is opened, and the water in the water storage tank 8 can be transported into the hydrogen washing tower 2 through the water delivery pipe 9. On the one hand, it can be used to supplement the washing liquid in the hydrogen washing tower 2, and on the other hand, it can also reduce the waste of water resources.

[0028] As a preferred embodiment, referring to Figure 1, a drain pipe 11 is connected between the gas-liquid separator of the hydrogen compressor 3 and the water storage tank 8. A drain valve 12 is provided on the drain pipe 11. Both the drain valve 12 and the water delivery valve 10 are liquid level regulating valves. The drain valve 12 is used to control the liquid level inside the gas-liquid separator above the water inlet end of the drain pipe 11, and the water delivery valve 10 is used to control the liquid level in the water storage tank 8. Even if the liquid level inside the gas-liquid separator gets out of control, it will not cause accidental leakage of hydrogen because the hydrogen will be transported to the water storage tank 8 or further transported to the hydrogen scrubbing tower 2. The liquid level regulating valve is used to cooperate with the liquid level sensor and the controller to adjust and control the liquid level inside the container. The connection method between it and the liquid level sensor and the controller belongs to the well-known prior art means for those skilled in the art.

[0029] As a preferred embodiment, referring to Figure 1 , a washing liquid cooler 13 is connected to the pump outlet end of the washing liquid circulation pump 6. The washing liquid cooler 13 is connected to the spray head at the top of the hydrogen scrubbing tower 2. The washing liquid cooler 13 can cool down the washing liquid. When the cooled washing liquid is used to spray and wash the hydrogen, it can improve the cooling effect on the hydrogen.

[0030] As a preferred embodiment, referring to Figure 1 , an outlet end of the water mist catcher 5 is connected to a hydrogen buffer tank 14. A gas transmission pipe 15 is connected to the hydrogen buffer tank 14. One end of the gas transmission pipe 15 far from the hydrogen buffer tank 14 is connected to a hydrogen venting tank 16. A gas transmission valve 17 is provided on the gas transmission pipe 15. Since hydrogen is a flammable and explosive medium, when the process is adjusted, there will be excess hydrogen to be vented. It needs to pass through the hydrogen venting tank 16. The inside of the venting tank is a water seal, and a nitrogen gas pipe and a steam pipe are provided. The excess hydrogen to be vented passes through the water seal inside the venting tank, and the nitrogen gas valve and the steam valve are opened to increase the humidity of the hydrogen and reduce its purity, reducing the possibility of hydrogen catching fire.

[0031] As a preferred embodiment, referring to Figure 1 , an inlet pipe 18 is connected between the hydrogen production electrolytic cell 1 and the hydrogen scrubbing tower 2. A hydrogen water seal tank 19 is provided on the inlet pipe 18. The hydrogen water seal tank 19 can prevent hydrogen from flowing back in the inlet pipe 18.

[0032] As a preferred embodiment, referring to Figure 1, a washing liquid delivery pipe 20 is connected to the pump outlet end of the washing liquid circulation pump 6. The washing liquid delivery pipe 20 is connected to the washing liquid cooler 13. A washing liquid distribution pipe 21 is connected to the washing liquid delivery pipe 20. One end of the washing liquid distribution pipe 21 away from the washing liquid delivery pipe 20 is connected to the hydrogen production electrolytic cell 1, and a distribution valve 22 is arranged on the washing liquid distribution pipe 21; the distribution valve 22 is a liquid level regulating valve, and the distribution valve 22 is used to control the liquid level of the washing liquid inside the hydrogen washing tower 2. When the distribution valve 22 is opened, the excess washing liquid in the hydrogen washing tower 2 can also be transported into the hydrogen production electrolytic cell 1 for use in electrolytic hydrogen production, which can reduce the use of other water resources.

[0033] As a preferred embodiment, referring to Figure 1 , a hydrogen circulation pipe 23 is connected between the gas outlet end of the hydrogen buffer tank 14 and the intake pipe 18, and a circulation valve 24 is arranged on the hydrogen circulation pipe 23. When the circulation valve 24 is opened, the washed hydrogen can enter the hydrogen washing tower 2 again, which is convenient for repeatedly washing the hydrogen.

[0034] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydrogen-saving water reduction and emission reduction washing system, the washing system comprising a hydrogen production electrolytic cell (1), a hydrogen washing tower (2), a hydrogen compressor (3), a hydrogen cooler (4), and a water mist catcher (5) which are connected in sequence, a washing liquid circulation pump (6) is connected to the bottom of the hydrogen washing tower (2), and the pump outlet end of the washing liquid circulation pump (6) is connected to a spray head at the top of the hydrogen washing tower (2), characterized in that: A cooling water return pipe (7) is connected between the hydrogen cooler (4) and the mist eliminator (5) and the gas-liquid separator of the hydrogen compressor (3). A water storage tank (8) is connected to the gas-liquid separator of the hydrogen compressor (3). A water delivery pipe (9) is connected between the water storage tank (8) and the hydrogen scrubbing tower (2). A water delivery valve (10) is provided on the water delivery pipe (9).

2. The hydrogen-saving and emission-reducing washing system according to claim 1, wherein: A drain pipe (11) is connected between the gas-liquid separator of the hydrogen compressor (3) and the water storage tank (8). A drain valve (12) is provided on the drain pipe (11). Both the drain valve (12) and the water delivery valve (10) are liquid level regulating valves. The drain valve (12) is used to control the liquid level inside the gas-liquid separator above the water inlet end of the drain pipe (11), and the water delivery valve (10) is used to control the liquid level in the water storage tank (8).

3. The hydrogen-saving and emission-reducing washing system according to claim 2, characterized in that: The pump outlet end of the washing liquid circulation pump (6) is connected to a washing liquid cooler (13), and the washing liquid cooler (13) is connected to the spray head at the top of the hydrogen scrubbing tower (2).

4. The hydrogen gas water-saving and emission-reducing washing system according to claim 3, characterized in that: The gas outlet end of the mist eliminator (5) is connected to a hydrogen buffer tank (14). A gas delivery pipe (15) is connected to the hydrogen buffer tank (14). One end of the gas delivery pipe (15) far from the hydrogen buffer tank (14) is connected to a hydrogen venting tank (16). A gas delivery valve (17) is provided on the gas delivery pipe (15).

5. The hydrogen gas water-saving and emission-reducing washing system according to claim 1, wherein: An inlet pipe (18) is connected between the hydrogen production electrolytic cell (1) and the hydrogen scrubbing tower (2). A hydrogen water seal tank (19) is provided on the inlet pipe (18).

6. The hydrogen gas water-saving and emission-reducing washing system according to claim 3, wherein: The pump outlet end of the washing liquid circulation pump (6) is connected to a washing liquid delivery pipe (20). The washing liquid delivery pipe (20) is connected to the washing liquid cooler (13). A washing liquid distribution pipe (21) is connected to the washing liquid delivery pipe (20). One end of the washing liquid distribution pipe (21) far from the washing liquid delivery pipe (20) is connected to the hydrogen production electrolytic cell (1). A distribution valve (22) is provided on the washing liquid distribution pipe (21).

7. The hydrogen gas water-saving and emission-reducing washing system according to claim 6, characterized in that: The distribution valve (22) is a liquid level regulating valve, and the distribution valve (22) is used to control the liquid level of the washing liquid inside the hydrogen scrubbing tower (2).

8. A hydrogen gas water-saving and emission-reducing washing system according to claim 4, characterized in that: A hydrogen circulation pipe (23) is connected between the gas outlet end of the hydrogen buffer tank (14) and the inlet pipe (18). A circulation valve (24) is provided on the hydrogen circulation pipe (23).

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