Low-voltage electrolyzed water gas cooling system

Abstract

The utility model relates to a low-voltage electrolyzed water gas cooling system which comprises a hydrogen washing tower, a heat exchange pump, a heat exchanger, a wet hydrogen pipeline, a cooling water feeding pipeline and a cooling water return pipeline, a gas inlet of the hydrogen washing tower is connected with the wet hydrogen pipeline, and a water outlet of the hydrogen washing tower is connected with the heat exchange pump through a first pipeline. The heat exchange pump is connected with the heat exchanger through a second pipeline, the heat exchanger is connected with the hydrogen washing tower through a third pipeline, the cooling water feeding pipeline is connected with a water inlet of the heat exchanger, and the cooling water return pipeline is connected with a water return port of the heat exchanger. The low-voltage electrolyzed water gas cooling system is high in heat exchange efficiency, low in cost, small in occupied space and suitable for a low-voltage system.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by electrolysis of water, in particular to a low-pressure water electrolysis gas cooling system. Background Art

[0002] In the traditional electrolysis of water to produce hydrogen and separate processes, pure water enters the electrolyzer for electrolysis to produce hydrogen and oxygen. The electrolysis process generates a lot of heat, and the operating temperature of the electrolyzer cannot exceed 85 degrees. The high-temperature liquid in the electrolyzer is continuously pumped out by a circulating pump, and the liquid is cooled by the anode and cathode heat exchangers before being sent back to the electrolyzer. In this way, the temperature of the electrolyzer is always controlled at the optimal reaction temperature of 85 degrees. The temperature in the electrolyzer is 85 degrees, so the wet hydrogen and wet oxygen produced by electrolysis are also 85 degrees. The higher the temperature, the more water vapor is taken away by hydrogen and oxygen. In the traditional process, a shell-and-tube heat exchanger is used to directly cool the hydrogen / oxygen by cooling the circulating water, cooling the gas temperature to 45 degrees, and the condensed coolant is returned to the electrolysis system.

[0003] The shell-and-tube heat exchanger has an extremely low gas-liquid heat transfer coefficient, poor heat transfer effect, and high cost. Due to its good high-pressure resistance, it is widely used in high-pressure systems. With the development of low-pressure systems, the lower the system pressure, the more water contained in the gas, and the higher the heat required to be taken away. When the normal pressure is compared with the 1.6Mpa pressure, the gas heat differs by about 11 times. The use of shell-and-tube heat exchangers not only greatly increases the cost of use, but also occupies a large space, and is not suitable for use in low-pressure systems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a low-pressure electrolytic water gas cooling system, which has high heat exchange efficiency, low cost, small occupied space and can be applied to low-pressure systems.

[0005] The utility model adopts the following technical solution to solve the technical problem: a low-pressure water electrolysis gas cooling system, comprising a hydrogen scrubbing tower, a heat exchange pump, a heat exchanger, a wet hydrogen pipeline, a cooling water supply pipeline and a cooling water return pipeline, the air inlet of the hydrogen scrubbing tower is connected with the wet hydrogen pipeline, the water outlet of the hydrogen scrubbing tower is connected with the heat exchange pump through a first pipeline, the heat exchange pump is connected with the heat exchanger through a second pipeline, the heat exchanger is connected with the hydrogen scrubbing tower through a third pipeline, the cooling water supply pipeline is connected with the water inlet of the heat exchanger, and the cooling water return pipeline is connected with the water return port of the heat exchanger.

[0006] The low-pressure electrolytic water gas cooling system uses a heat exchange pump and a heat exchanger to preliminarily cool the washing liquid in the hydrogen washing tower, and the cooled washing liquid flows into the hydrogen washing tower to contact with the wet hydrogen to exchange heat. The washing liquid in the hydrogen washing tower is then cooled by a heat exchange pump and a heat exchanger, and the cooled washing liquid flows into the hydrogen washing tower to contact with the wet hydrogen to exchange heat again, thereby achieving a cooling effect. The low-pressure electrolytic water gas cooling system has high heat exchange efficiency, occupies a small volume, saves operating costs, and is suitable for low-pressure systems.

[0007] In one embodiment, a washing liquid storage area, a filling area and a spray water distribution pipe are provided in the hydrogen washing tower of the low-pressure electrolysis water gas cooling system, the spray water distribution pipe is located at the top of the washing tower, the filling area is located at the upper part of the washing tower, the washing liquid storage area is located below the filling area, and a differential pressure level gauge for monitoring the liquid level is provided on the washing tower.

[0008] In one embodiment, the low-pressure electrolyzed water gas cooling system also includes a hydrogen gas-liquid dripping tank, the air inlet of the hydrogen gas-liquid dripping tank is connected to the air outlet of the hydrogen washing tower through a fourth pipeline, and the liquid outlet of the hydrogen gas-liquid dripping tank is connected to the reflux port of the hydrogen washing tower through a fifth pipeline.

[0009] In one of the embodiments, a gas monitor for monitoring hydrogen and oxygen is provided on the fourth pipeline of the low-pressure water electrolysis gas cooling system.

[0010] In one of the embodiments, a temperature transmitter for monitoring temperature and a flow meter for monitoring flow are provided on the third pipeline of the low-pressure electrolyzed water gas cooling system.

[0011] In one of the embodiments, the low-pressure electrolyzed water gas cooling system further includes a liquid reflux pipeline, the heat exchanger is connected to the liquid reflux pipeline, and a liquid discharge pneumatic valve for gas and liquid discharge is provided on the liquid reflux pipeline.

[0012] In one embodiment, the low-pressure electrolyzed water gas cooling system also includes a wet hydrogen outlet pipeline, on which a normal temperature wet hydrogen pipeline and a wet hydrogen vent pipeline are arranged, a pressure maintaining regulating valve is arranged on the normal temperature wet hydrogen pipeline, and a vent regulating valve is arranged on the wet hydrogen vent pipeline.

[0013] In one of the embodiments, a pressure transmitter for monitoring pressure is provided on the wet hydrogen outlet pipeline of the low-pressure water electrolysis gas cooling system.

[0014] In one of the embodiments, the low-pressure electrolytic water gas cooling system also includes a pure water pipeline, the water inlet of the hydrogen scrubbing tower is connected to the pure water pipeline, and a water replenishment pneumatic valve is provided on the pure water pipeline.

[0015] The beneficial effects of this application are:

[0016] The present application provides a low-pressure electrolytic water gas cooling system, which circulates and exchanges heat for washing liquid in a hydrogen washing tower through a heat exchange pump and a heat exchanger, and reflows the cooled washing liquid into the hydrogen washing tower to contact with wet hydrogen to complete washing and heat exchange. The low-pressure electrolytic water gas cooling system uses cooling water of a heat exchanger to exchange heat for washing liquid, and then mixes the washing liquid with wet hydrogen for heat exchange, which greatly improves the heat exchange efficiency and saves the operation cost.

[0017] The direct dilution method using detergent greatly reduces the loss of electrolyte and minimizes the loss of electrolyte.

[0018] The cooling system monitors temperature, pressure, liquid level, flow and oxygen content in real time to achieve digital operation.

[0019] The cooling system uses PLC control for fully automated operation, automatic monitoring and interlocking, no leakage points, and no risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a low-pressure water electrolysis gas cooling system according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a hydrogen scrubber of a low-pressure water electrolysis gas cooling system according to an embodiment of the present application;

[0022] in:

[0023] 1. Hydrogen scrubber; 2. Heat exchange pump; 3. Heat exchanger; 4. Hydrogen gas-liquid dripping tank; 11. Scrubber storage area; 12. Filling area; 13. Spray water distribution pipe; 14. Pressure differential level gauge; 15. Water replenishment pneumatic valve; 31. Temperature transmitter; 32. Flow meter; 33. Drain pneumatic valve; 41. Gas monitor; 42. Pressure maintaining regulating valve; 43. Venting regulating valve; 44. Pressure transmitter; 100. First pipeline; 101. Second pipeline; 102. Third pipeline; 103. Cooling water supply pipeline; 104. Cooling water return pipeline; 105. Fourth pipeline; 106. Fifth pipeline; 107. Wet hydrogen pipeline; 108. Liquid reflux pipeline; 109. Wet hydrogen outlet pipeline; 110. Normal temperature wet hydrogen pipeline; 111. Wet hydrogen vent pipeline; 112. Pure water pipeline. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1As shown, an embodiment of the present application provides a low-pressure electrolytic water gas cooling system, including a hydrogen scrubbing tower 1, a heat pump 2, a heat exchanger 3, a wet hydrogen pipeline 107, a cooling water supply pipeline 103 and a cooling water return pipeline 104, the air inlet of the hydrogen scrubbing tower 1 is connected to the wet hydrogen pipeline 107, the water outlet of the hydrogen scrubbing tower 1 is connected to the heat pump 2 through a first pipeline 100, the heat pump 2 is connected to the heat exchanger 3 through a second pipeline 101, the heat exchanger 3 is connected to the hydrogen scrubbing tower 1 through a third pipeline 102, the cooling water supply pipeline 103 is connected to the water inlet of the heat exchanger 3, and the cooling water return pipeline 104 is connected to the return port of the heat exchanger 3.

[0026] Specifically, wet hydrogen flows into the packing area 12 of the hydrogen scrubber 1 through the wet hydrogen pipeline 107, and the temperature of the wet hydrogen is 85 degrees. The heat exchange pump 2 extracts the washing liquid in the hydrogen scrubber 1 through the first pipeline 100, and the washing liquid flows into the heat exchanger 3 through the second pipeline 101. The cooling water in the heat exchanger 3 exchanges heat with the washing liquid, so that the temperature of the washing liquid drops to 40 degrees. The 40-degree washing liquid returns to the hydrogen scrubber 1 through the third pipeline 102, and the washing liquid is sprayed out by the spray water pipe 13 of the hydrogen scrubber 1, so that the 40-degree washing liquid is mixed with the 85-degree wet hydrogen for heat exchange, so that the overall temperature is reduced to 45 degrees. Then, the heat exchange pump 2 cooperates with the cooling water of the heat exchanger 3 to exchange heat with the 45-degree washing liquid, so that the temperature of the washing liquid drops to 40 degrees. The 40-degree washing liquid flows back to the hydrogen scrubber 1 to mix with the 45-degree wet hydrogen for heat exchange, so that the overall temperature is reduced to 40 degrees. The heat exchanger 3 is connected to the cooling water system through a cooling water supply pipe 103 and a cooling water return pipe 104 respectively.

[0027] The wet hydrogen includes hydrogen and electrolyte entrained at the front end, and the wet hydrogen is fully in contact with the washing liquid in the packing area 12 of the hydrogen washing tower 1 to complete the mixed liquid dilution. The liquid alkali content in the wet hydrogen is 30%, and after washing in the hydrogen washing tower 1, the alkali content of the wet hydrogen is reduced to less than 0.05%.

[0028] Among them, heat exchanger 3 is the simplest plate-type heat tracer, with a large liquid heat transfer coefficient and easy maintenance.

[0029] In the above structure, the washing liquid in the hydrogen washing tower 1 is circulated and heat-exchanged by the cooling water of the heat exchange pump 2 and the heat exchanger 3, so that the washing liquid is mixed with the wet hydrogen in the hydrogen washing tower 1 for heat exchange, thereby reducing the temperature of the wet hydrogen. In the prior art, the heat exchange efficiency between the wet hydrogen and the cooling water is low, and the overall equipment is bulky. The low-pressure electrolytic water gas cooling system has high heat exchange efficiency, small occupied volume, and saves operating costs, and is suitable for low-pressure systems.

[0030] like Figure 2As shown, in one embodiment, a washing liquid storage area 11, a filling area 12 and a spray water distribution pipe 13 are provided in the hydrogen washing tower 1 of the low-pressure electrolysis water gas cooling system, the spray water distribution pipe 13 is located at the top of the washing tower, the filling area 12 is located at the upper part of the washing tower, the washing liquid storage area 11 is located below the filling area 12, and a differential pressure level gauge 14 for monitoring the liquid level is provided on the washing tower.

[0031] Specifically, the washing liquid is located in the washing liquid storage area 11, and the wet hydrogen enters the packing area 12 of the hydrogen washing tower 1 through the wet hydrogen pipeline 107. After the washing liquid is cooled and heat-exchanged by the heat exchange pump 2 and the heat exchanger 3, it flows into the spray water distribution pipe 13 of the hydrogen washing tower 1. The spray water distribution pipe 13 sprays the washing liquid to the packing area 12 for mixing and heat-exchanging with the wet hydrogen. Among them, the height of the washing liquid storage area 11 is 1200mm, the height of the packing area 12 is 400mm, the diameter of the packing area 12 is 25mm, and the spray water distribution pipe 13 is located above the packing area 12. The packing area 12 is located between the washing liquid storage area 11 and the packing area 12. The differential pressure level gauge 14 monitors the liquid level of the washing liquid in the hydrogen washing tower 1. When the liquid level reaches the set value, the drain pneumatic valve 33 is opened to return the liquid in the hydrogen washing tower 1 to the front-end system for re-electrolysis.

[0032] This arrangement increases the contact area between the scrubbing liquid and the wet hydrogen, effectively improving the scrubbing and heat exchange effects.

[0033] like Figure 1 As shown, in one embodiment, the low-pressure electrolyzed water gas cooling system also includes a hydrogen gas-liquid dripping tank 4, the air inlet of the hydrogen gas-liquid dripping tank 4 is connected to the air outlet of the hydrogen washing tower 1 through a fourth pipeline 105, and the liquid outlet of the hydrogen gas-liquid dripping tank 4 is connected to the reflux port of the hydrogen washing tower 1 through a fifth pipeline 106.

[0034] Specifically, the hydrogen after cooling and washing in the hydrogen washing tower 1 carries a small amount of washing liquid and flows from the gas outlet of the hydrogen washing tower 1 into the hydrogen gas-liquid dripping tank 4. The hydrogen gas-liquid dripping tank 4 performs gas-liquid separation on the hydrogen, and the retained washing liquid flows out from the liquid outlet of the hydrogen gas-liquid dripping tank 4 and flows into the hydrogen washing tower 1 through the fifth pipeline 106 and the reflux port of the hydrogen washing tower 1. The fifth pipeline 106 and the reflux port of the hydrogen washing tower 1 are connected to the washing liquid storage area 11.

[0035] This arrangement facilitates gas-liquid separation of hydrogen entrained with the scrubbing liquid.

[0036] like Figure 1As shown, in one embodiment, a gas monitor 41 for monitoring hydrogen and oxygen is provided on the fourth pipeline 105 of the low-pressure electrolyzed water gas cooling system. The gas monitor 41 monitors the gas content in the fourth pipeline 105. When the oxygen content does not meet the standard, the hydrogen is vented by adjusting the venting regulating valve 43. When the oxygen content meets the standard, the pressure maintaining regulating valve 42 is adjusted to output hydrogen. When the hydrogen content is abnormal during operation, the system is directly interlocked and shut down. This setting facilitates timely monitoring of the hydrogen and oxygen content.

[0037] like Figure 1 As shown, in one embodiment, a temperature transmitter 31 for monitoring temperature and a flow meter 32 for monitoring flow are provided on the third pipeline 102 of the low-pressure electrolyzed water gas cooling system. The temperature transmitter 31 and the flow meter 32 monitor the temperature and flow of the washing liquid in the third pipeline 102 to monitor whether the temperature and flow of the washing liquid meet the requirements. The temperature transmitter 31 is interlocked with the cooling water system, and the cooling water system automatically adjusts the flow of cooling water to ensure the temperature of the washing liquid. This setting facilitates real-time monitoring of the temperature and flow of the washing liquid, and cooperates with the cooling water system to effectively adjust the cooling temperature of the washing liquid.

[0038] like Figure 1 As shown, in one embodiment, the low-pressure electrolytic water gas cooling system further includes a liquid return line 108, the heat exchanger 3 is connected to the liquid return line 108, and a liquid discharge pneumatic valve 33 for gas and liquid discharge is provided on the liquid return line 108. When the differential pressure level gauge 14 detects that the liquid level of the washing liquid reaches the set value, the liquid discharge pneumatic valve 33 is adjusted to return the washing liquid in the heat exchanger 3 to the front-end system through the liquid return line 108 for re-electrolysis. This setting is convenient for connection with the front-end system and for adjusting the liquid level of the washing liquid in the hydrogen washing pump.

[0039] like Figure 1 As shown, in one embodiment, the low-pressure water electrolysis gas cooling system further includes a wet hydrogen outlet pipeline 109, on which a normal temperature wet hydrogen pipeline 110 and a wet hydrogen venting pipeline 111 are provided, a pressure-maintaining regulating valve 42 is provided on the normal temperature wet hydrogen pipeline 110, and a venting regulating valve 43 is provided on the wet hydrogen venting pipeline 111. According to the monitoring data of the gas monitor 41, the setting of the pressure-maintaining regulating valve 42 is convenient for outputting hydrogen, and the setting of the venting regulating valve 43 is convenient for venting hydrogen.

[0040] like Figure 1As shown, in one embodiment, a pressure transmitter 44 for monitoring pressure is provided on the wet hydrogen outlet pipeline 109 of the low-pressure water electrolysis gas cooling system. The pressure transmitter 44 is used to monitor the pressure of hydrogen on the wet hydrogen outlet pipeline 109. When the pressure is stable, hydrogen is output to the rear end through the pressure-maintaining regulating valve 42. When the pressure is overpressured, the system pressure is released by adjusting the venting regulating valve 43. This setting facilitates monitoring the pressure of the wet hydrogen.

[0041] like Figure 1 As shown, in one embodiment, the low-pressure electrolytic water gas cooling system further includes a pure water pipeline 112, the water inlet of the hydrogen scrubber 1 is connected to the pure water pipeline 112, and a water replenishment pneumatic valve 15 is provided on the pure water pipeline 112. The hydrogen scrubber 1 is connected to the pure water system through the pure water pipeline 112, and the concentration of the scrubbing liquid is reduced by adjusting the water replenishment pneumatic valve 15, so as to better dilute the alkali content of the wet hydrogen.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A low-pressure water electrolysis gas cooling system, characterized in that: The invention comprises a hydrogen scrubbing tower (1), a heat exchange pump (2), a heat exchanger (3), a wet hydrogen pipeline (107), a cooling water supply pipeline (103) and a cooling water return pipeline (104); the air inlet of the hydrogen scrubbing tower (1) is connected to the wet hydrogen pipeline (107); the water outlet of the hydrogen scrubbing tower (1) is connected to the heat exchange pump (2) via a first pipeline (100); the heat exchange pump (2) is connected to the heat exchanger (3) via a second pipeline (101); the heat exchanger (3) is connected to the hydrogen scrubbing tower (1) via a third pipeline (102); the cooling water supply pipeline (103) is connected to the water inlet of the heat exchanger (3); and the cooling water return pipeline (104) is connected to the water return port of the heat exchanger (3).

2. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: The hydrogen scrubbing tower (1) is provided with a scrubbing liquid storage area (11), a filling area (12) and a spray water distribution pipe (13), wherein the spray water distribution pipe (13) is located at the top of the scrubbing tower, the filling area (12) is located at the upper part of the scrubbing tower, the scrubbing liquid storage area (11) is located below the filling area (12), and a differential pressure level gauge (14) for monitoring the liquid level is provided on the scrubbing tower.

3. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: It also comprises a hydrogen gas-liquid dripping tank (4), the gas inlet of the hydrogen gas-liquid dripping tank (4) is connected to the gas outlet of the hydrogen washing tower (1) via a fourth pipeline (105), and the liquid outlet of the hydrogen gas-liquid dripping tank (4) is connected to the reflux port of the hydrogen washing tower (1) via a fifth pipeline (106).

4. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: The fourth pipeline (105) is provided with a gas monitor (41) for monitoring hydrogen and oxygen.

5. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: The third pipeline (102) is provided with a temperature transmitter (31) for monitoring temperature and a flow meter (32) for monitoring flow.

6. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: It also comprises a liquid return pipeline (108), the heat exchanger (3) is connected to the liquid return pipeline (108), and a liquid discharge pneumatic valve (33) for discharging gas and liquid is arranged on the liquid return pipeline (108).

7. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: The invention also comprises a wet hydrogen outlet pipeline (109), on which a normal temperature wet hydrogen pipeline (110) and a wet hydrogen venting pipeline (111) are arranged, the normal temperature wet hydrogen pipeline (110) is provided with a pressure maintaining regulating valve (42), and the wet hydrogen venting pipeline (111) is provided with a venting regulating valve (43).

8. The low-pressure water electrolysis gas cooling system according to claim 7, characterized in that: The wet hydrogen outlet pipeline (109) is provided with a pressure transmitter (44) for monitoring pressure.

9. The low-pressure water electrolysis gas cooling system according to claim 1, characterized in that: It also comprises a pure water pipeline (112), the water inlet of the hydrogen scrubbing tower (1) is connected to the pure water pipeline (112), and a water replenishment pneumatic valve (15) is arranged on the pure water pipeline (112).

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