Alkaline water hydrogen production electrolytic cell with cooling device

Abstract

The invention relates to the technical field of alkaline water hydrogen production electrolytic cells, in particular to an alkaline water hydrogen production electrolytic cell with a cooling device, which comprises an end polar plate of the alkaline water hydrogen production electrolytic cell and a cooling cavity arranged in the end polar plate, and the cooling cavity in the end polar plate is connected with a circulating cooling system; the further improved scheme also comprises an internal cooling cavity which is arranged on the middle polar plate and is connected with the circulating cooling system. The temperature of the sealing gaskets at the end polar plate and the middle polar plate can be reduced, so that the compressive strength of the sealing gaskets at the end polar plate and the middle polar plate is improved, the problem that the sealing gaskets at the end polar plate and the middle polar plate are more prone to failure and damage is solved, the working reliability of the alkaline water hydrogen production electrolytic cell is improved, and the service life of the alkaline water hydrogen production electrolytic cell is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of alkaline water hydrogen production electrolyzers, and in particular to an alkaline water hydrogen production electrolyzer with a cooling device. Background Art

[0002] An alkaline water hydrogen electrolyzer is a device that produces hydrogen by electrolyzing alkaline water. Its basic principle is to electrolyze an alkaline aqueous solution, producing hydrogen and oxygen at the cathode and anode of the electrolyzer, respectively. Traditional alkaline water electrolyzers typically use a 30% potassium hydroxide solution or a 26% sodium hydroxide solution as the electrolyte. They offer advantages such as mature technology, extensive operating experience, and low costs. Current industrial electrolyzers are available in circular and square configurations, with pressure, slightly positive pressure, and atmospheric pressure options. Circular pressurized electrolyzers hold the highest market share.

[0003] Figure 1 It is a typical alkaline water hydrogen production electrolyzer, which includes a number of plate parts assembled by stacking, with sealing gaskets provided between adjacent plate parts. Among the plate parts assembled by stacking, the plate parts located at the axial ends of the electrolyzer are called end plates, and the plate parts located between the two end plates are called plates or bipolar plates; and a plate located in the middle of the alkaline water hydrogen production electrolyzer is provided for the inlet and outlet of the alkaline solution, which is conventionally called the middle plate.

[0004] The alkaline water hydrogen electrolyzer is equipped with end clamps at both ends of the assembled plate components to compress the assembled plate components and sealing gaskets. The stack is axially clamped using tension bolts, disc springs, and lock nuts. Within the assembled electrolyzer, an electrolysis chamber is formed between adjacent plates. This chamber is divided into an anode chamber and a cathode chamber by a diaphragm, with the diaphragm separating the two chambers.

[0005] The alkaline water hydrogen production electrolyzer is composed of a number of electrolytic chambers stacked in series. Due to the overpotential and ohmic resistance of the electrodes, the electrical energy flowing into the electrolyzer is converted into thermal energy except for the energy used to produce hydrogen and oxygen. The thermal energy converted from electrical energy exceeding the thermal neutral voltage of 1.48V is carried out of the electrolyzer for cooling due to the temperature rise of the alkaline solution (electrolyte) circulating between the chambers. In order to maintain the catalytic activity of the electrodes, the electrolyzer is often operated at a higher temperature.

[0006] Currently, alkaline water hydrogen electrolyzers are primarily used in green electricity production scenarios, such as photovoltaic and wind power generation. Due to the natural limitations of green electricity, the load powering the electrolyzers is intermittent and fluctuates widely. This results in unstable operation, with frequent starts and stops and wide load fluctuations. This leads to frequent fluctuations in the electrolyzer's temperature and pressure. Thermal expansion and contraction, coupled with pressure fluctuations, cause the electrolyzer to frequently expand and contract. To maintain a reliable seal despite changes in length, disc springs and locknuts are installed at both ends of the electrolyzer's tension bolts. The disc springs increase and decrease in compression to compensate for the cell's length. Increased disc spring compression increases the surface pressure applied to each sealing gasket; conversely, reduced disc spring compression reduces the surface pressure applied to each sealing gasket. This results in a constant flow of surface pressure on the sealing gaskets. Furthermore, due to the delay in force transmission, sealing gaskets closer to the ends of the electrolyzer are more sensitive to pressure changes.

[0007] Current sealing gaskets in alkaline water hydrogen electrolyzers are made from modified polytetrafluoroethylene (PTFE). PTFE's physical properties dictate that it softens rapidly with increasing temperature. For example, the compressive strength of pure PTFE is 7-14 MPa at 20°C, but drops to 3-7 MPa at 100°C. Modified PTFE has similar physical properties.

[0008] Furthermore, the applicant, through long-term observation of the operation of the alkaline water hydrogen production electrolyzer and analysis of project problems, found that the sealing gaskets near the end plates and the middle plates in the alkaline water hydrogen production electrolyzer were more likely to fail than the sealing gaskets located between the other plates of the electrolyzer. Further analysis revealed two reasons for this: First, the end plates and the middle plates are constructed of thicker steel plates than the other plates. The thicker steel plates result in greater heat storage and better heat transfer performance than other plates, which transfers more heat to the sealing gaskets, causing the sealing gaskets in this area to soften before the sealing gaskets between other plates. All thermal expansion of the electrolyzer is loaded on this weak point, causing the sealing gasket to fail; Second, the force generated by the change in the compression of the disc spring due to thermal expansion and contraction and pressure changes is transmitted to each sealing gasket in turn, and the sealing gaskets at the two ends are first subjected to the greatest force, making the stress condition of the sealing gaskets in this area more severe than that of the sealing gaskets in other positions, thereby accelerating the damage of the sealing gaskets in this area. The combined effect of the above two reasons is the most fundamental reason why the sealing gaskets near the end plates and the middle plates are prone to failure.

[0009] Therefore, how to prevent the failure and damage of the sealing gaskets in the alkaline water hydrogen production electrolyzer, especially to solve the problem that the sealing gaskets near the end plates and the middle plates are more prone to failure and damage, is one of the technical problems that technicians in this field urgently need to solve. Summary of the Invention

[0010] To address the above-mentioned issues, the present invention proposes an alkaline water hydrogen production electrolyzer with a cooling device. This device aims to reduce the temperature of the sealing gaskets near the end plates and the intermediate plates, thereby increasing the compressive strength of the sealing gaskets there. This solves the problem of the sealing gaskets being more susceptible to failure and damage at the end plates and the intermediate plates, thereby improving the operating reliability of the alkaline water hydrogen production electrolyzer and effectively extending the service life of the alkaline water hydrogen production electrolyzer. The specific technical solution is as follows: An alkaline water hydrogen production electrolyzer with a cooling device is provided with cooling cavities in the end plates located at both ends of the alkaline water hydrogen production electrolyzer, or cooling cavities are provided in both the end plates and the intermediate plates located at both ends of the alkaline water hydrogen production electrolyzer; wherein the cooling cavities are connected to a circulating cooling system.

[0011] Furthermore, the cooling cavities of the end plates and the intermediate plates of the alkaline water hydrogen production electrolyzer are arranged at axially adjacent positions where they abut against the sealing gasket.

[0012] Furthermore, the cooling cavities in the end plates and the intermediate plates of the alkaline water hydrogen production electrolyzer are arranged in a closed annular shape at an axially adjacent position where the sealing gasket is abutted, and are used to cool the sealing gasket pressed against its end face, thereby achieving a compressive strength of the sealing gasket pressed against the end faces of the end plates and the intermediate plates greater than the compressive strength of the sealing gaskets located between the remaining plates.

[0013] Furthermore, the outer edges of the end plates and the intermediate plates of the alkaline water hydrogen production electrolyzer are respectively provided with a coolant inlet and a coolant outlet connected to the cooling cavity inside the end plates and the intermediate plates, and the coolant inlet and the coolant outlet are connected to the circulating cooling system through pipelines.

[0014] As one of the preferred schemes of the circulating cooling system in the present invention, the circulating cooling system of the alkaline water hydrogen production electrolyzer is a circulating cooling system that adopts a heat exchange method of a heat exchanger, which includes a cooling circulation pipeline connected to the coolant inlet and coolant outlet corresponding to the outer edge of the end plate and the intermediate plate, and a coolant circulation pump and a heat exchanger respectively arranged on the cooling circulation pipeline.

[0015] Furthermore, the circulating liquid used in the circulating cooling system of the alkaline water hydrogen production electrolyzer is a non-conductor; at the same time, the pipeline connecting the circulating cooling system and the electrolyzer is an insulating pipeline.

[0016] Preferably, the heat exchanger is connected to a pipeline of circulating cooling water from a public works to achieve heat exchange.

[0017] Preferably, the coolant of the circulating cooling system may be deionized water, silicone oil, ethanol, etc., or other non-conductive fluids.

[0018] Furthermore, the coolant is selected taking into account compatibility with materials in the circulating cooling system and does not corrode the system materials.

[0019] By starting the circulating cooling system, the coolant is passed into the internal cooling cavity of the end plate and the middle plate of the alkaline water hydrogen production electrolyzer, taking away the local heat of the sealing gasket near the end plate and the middle plate, so as to cool the sealing gasket, so that the temperature of the sealing gasket at this location is always lower than the temperature of the sealing gaskets in other parts, thereby making the compressive strength of the sealing gasket at this location higher than the compressive strength of the sealing gaskets in other parts, thereby achieving the purpose of resisting pressure changes.

[0020] In the present invention, the heat brought out of the cooling chamber is brought out of the circulating cooling system through the heat exchanger.

[0021] In the present invention, the pipeline connecting the circulating cooling system and the electrolytic cell adopts a non-conductive insulating pipeline, and the coolant used in the circulating cooling system is also non-conductive.

[0022] As the second preferred embodiment of the circulating cooling system in the present invention, the circulating cooling system is a circulating cooling system that utilizes the circulating alkali liquid of the hydrogen production system for heat exchange. The cooling method of the circulating cooling system that utilizes the circulating alkali liquid of the hydrogen production system for heat exchange is as follows: the low-temperature circulating alkali liquid to be introduced into the alkaline water hydrogen production electrolytic cell is first introduced into the cooling cavity of the end plate and the intermediate plate to take away the heat, and then enters the electrolytic cell for electrolysis reaction, so as to achieve cooling of the sealing gasket pressed against the end faces of the end plate and the intermediate plate.

[0023] Preferably, the circulating cooling system that utilizes the circulating alkali liquid of the hydrogen production system for heat exchange includes an alkali liquid circulation pump of the hydrogen production system, and the alkali liquid output end of the alkali liquid circulation pump is connected to the coolant inlet on the end plate and the intermediate plate through a pipeline. After the heat is taken away by the cooling cavity, the coolant outlet on the end plate and the intermediate plate is connected to the interior of the alkaline water hydrogen production electrolyzer through a pipeline.

[0024] Preferably, a partition is provided in the cooling cavity arranged in a closed annular shape inside the end plate and the intermediate plate, and the coolant inlet and the coolant outlet are respectively arranged on both sides of the partition on the end plate and the intermediate plate.

[0025] The above technical solution of the present invention focuses on solving the problem of failure of the sealing gasket located at the weakest link among all the sealing gaskets in the alkaline water hydrogen production electrolyzer. It improves the temperature environment of the sealing gasket pressed against the end pressure plate and the intermediate plate by setting a cooling cavity inside the end plate and the intermediate plate, thereby increasing the service life of the sealing gasket at this location. Therefore, when cooling cavities are set only on the end pressure plate and the intermediate plate, and no cooling cavity is set on the other plates, the weak plate problem in the "barrel theory" (i.e., the problem that early damage to the sealing gasket at the end pressure plate and the intermediate plate leads to early failure of the entire electrolyzer) is strengthened, so that the service life of the sealing gasket pressed against the end pressure plate and the intermediate plate is close to or exceeds the service life of the sealing gasket located between the other plates, thereby greatly improving the overall service life of the alkaline water hydrogen production electrolyzer.

[0026] The beneficial effects of the present invention are: First, the present invention is an alkaline water hydrogen production electrolyzer with a cooling device. By setting a cooling cavity in the end plate and the middle plate of the alkaline water hydrogen production electrolyzer, the sealing gasket pressed against the end surface of the end plate and the middle plate is cooled, so that the compressive strength of the sealing gasket at this location is higher than that of the sealing gaskets at other locations. This solves the problem that the sealing gaskets at the end plate and the middle plate are more prone to failure and damage, improves the working reliability of the alkaline water hydrogen production electrolyzer, and effectively extends the overall service life of the alkaline water hydrogen production electrolyzer.

[0027] Second, the alkaline water hydrogen production electrolyzer with a cooling device of the present invention adopts a circulating cooling system with a heat exchanger heat exchange method. Its cooling circulation pipeline is a non-conductive insulating pipeline, and the coolant is a non-conductive fluid, which further improves the operating safety and working reliability of the electrolyzer.

[0028] Third, the alkaline water hydrogen production electrolyzer with a cooling device of the present invention utilizes the circulating alkaline liquid of the hydrogen production system for heat exchange in a circulating cooling system, without the need for a special heat exchanger. While cooling the sealing gaskets at the end plates and the intermediate plates and increasing the service life of the sealing gaskets therein, it also saves the purchase cost of the heat exchanger and the coolant circulation pump, and reduces the energy consumption of heat exchange, thereby having good energy-saving performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of an alkaline water hydrogen production electrolyzer in the prior art; Figure 2 Yes Figure 1 An end plate of an alkaline water hydrogen production electrolyzer with a cooling device formed by improving an alkaline water hydrogen production electrolyzer of the present invention (a cooling cavity is provided inside the pole frame portion of the end plate for pressing the sealing gasket); Figure 2The view is a two-view view, the left part of which is the main view and the right part is the left view of the main view.

[0030] Figure 3 This is a schematic diagram of the installation position of the cooling cavity of the end plate of an alkaline water hydrogen production electrolyzer with a cooling device according to the present invention (partially enlarged schematic diagram); Figure 4 This is one of the structural schematic diagrams of the circulating cooling system of an alkaline water hydrogen production electrolyzer with a cooling device of the present invention (using a heat exchanger heat exchange method).

[0031] Figure 5 This is the second structural schematic diagram of the circulating cooling system of an alkaline water hydrogen production electrolyzer with a cooling device according to the present invention (using a circulating alkali solution heat exchange method).

[0032] In the figure: 1. end pressure plate, 2. insulating plate, 3. end plate, 4. plate, 5. sealing gasket, 6. oxygen evolution electrode, 7. hydrogen evolution electrode, 8. nut, 9. disc spring, 10. diaphragm, 11. insulating sleeve, 12. tightening bolt, 13. cooling chamber, 14. intermediate plate, 15. partition, 16. coolant inlet, 17. coolant outlet, 18. cooling circulation pipeline, 19. coolant circulation pump, 20. heat exchanger, 21. alkali solution channel, 22. end surface countersunk hole, 23. through groove, 24. alkali solution through hole, 25. plate body of end plate, 26. pole frame of end plate, 27. alkali solution circulation pump. DETAILED DESCRIPTION

[0033] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] like Figures 1 to 5 The figure shows an embodiment of an alkaline water hydrogen production electrolyzer with a cooling device according to the present invention, wherein cooling cavities 13 are provided in the end plates 3 located at both ends of the alkaline water hydrogen production electrolyzer, or cooling cavities are provided in both the end plates 3 and the intermediate plates 14 located at both ends of the alkaline water hydrogen production electrolyzer; wherein the cooling cavity 13 is connected to a circulating cooling system.

[0035] Furthermore, the cooling cavities 13 of the end plates 3 and the intermediate plates 14 are arranged at adjacent positions in the longitudinal direction where they abut against the sealing gasket 5 .

[0036] Furthermore, the cooling cavity 13 in the end plate 3 and the intermediate plate 14 is arranged in a closed ring shape at an axially adjacent position where the sealing gasket 5 is abutted, and is used to cool the sealing gasket 5 pressed against its end face, so that the compressive strength of the sealing gasket 5 pressed against the end plate 3 and the intermediate plate 14 is greater than the compressive strength of the sealing gasket located between the remaining plates 4.

[0037] Furthermore, a coolant inlet 16 and a coolant outlet 17 connected to the cooling cavity 13 inside the end plate 3 and the intermediate plate 14 are respectively provided at the outer edge portions of the end plate 3 and the intermediate plate 14, and the coolant inlet 16 and the coolant outlet 17 are connected to the circulating cooling system through pipelines.

[0038] As one of the preferred schemes of the circulating cooling system in this embodiment, the circulating cooling system is a circulating cooling system that adopts a heat exchange method of a heat exchanger, which includes a cooling circulation pipeline 18 connected to the coolant inlet 16 and the coolant outlet 17 on the end electrode plate 3 and the intermediate electrode plate 14, and a coolant circulation pump 19 and a heat exchanger 20 respectively arranged on the cooling circulation pipeline 18.

[0039] Furthermore, the circulating liquid used in the circulating cooling system of the alkaline water hydrogen production electrolyzer is a non-conductor; at the same time, the pipeline connecting the circulating cooling system and the electrolyzer is an insulating pipeline.

[0040] Preferably, the heat exchanger 20 is connected to a pipeline of circulating cooling water from a public utility to achieve heat exchange.

[0041] Preferably, the coolant of the circulating cooling system may be deionized water, silicone oil, ethanol, etc., or other non-conductive fluids.

[0042] Furthermore, the coolant is selected taking into account compatibility with materials in the circulating cooling system and does not corrode the system materials.

[0043] By starting the circulating cooling system, the coolant is passed into the cooling cavity 13 inside the end plate 3 and the intermediate plate 14 of the alkaline water hydrogen production electrolyzer, taking away the local heat of the sealing gasket 5 near the end plate 3 and the intermediate plate 14, so as to cool the sealing gasket 5, so that the temperature of the sealing gasket 5 at this location is always lower than the temperature of the sealing gasket 5 at other locations, thereby making the compressive strength of the sealing gasket 5 at this location higher than the compressive strength of the sealing gaskets at other locations, thereby achieving the purpose of resisting pressure changes.

[0044] In this embodiment, the heat brought out of the cooling chamber 13 is brought out of the circulating cooling system through the heat exchanger 20 .

[0045] In this embodiment, the pipeline connecting the circulating cooling system and the electrolytic cell adopts a non-conductive insulating pipeline, and the coolant used in the circulating cooling system is also non-conductive.

[0046] As the second preferred solution of the circulating cooling system in this embodiment, the circulating cooling system is a circulating cooling system that uses the circulating alkali liquid of the hydrogen production system for heat exchange. The cooling method of the circulating cooling system that uses the circulating alkali liquid of the hydrogen production system for heat exchange is as follows: the low-temperature circulating alkali liquid to be introduced into the alkaline water hydrogen production electrolytic cell is first introduced into the cooling cavity 13 of the end plate 3 and the intermediate plate 14 to take away the heat, and then enters the electrolytic cell for electrolysis reaction, so as to achieve cooling of the sealing gasket 4 pressed against the end faces of the end plate 3 and the intermediate plate 14.

[0047] Preferably, the circulating cooling system that utilizes the circulating alkali liquid of the hydrogen production system for heat exchange includes an alkali liquid circulation pump 27 of the hydrogen production system, and the alkali liquid output end of the alkali liquid circulation pump 27 is connected to the coolant inlet 16 on the end electrode plate 3 and the intermediate electrode plate 14 through a pipeline. After the heat is taken away by the cooling cavity 13, the coolant outlet 17 on the end electrode plate 3 and the intermediate electrode plate 14 is connected to the interior of the alkaline water hydrogen production electrolyzer through a pipeline.

[0048] Preferably, a partition 15 is provided in the cooling cavity 13 arranged in a closed annular shape inside the end plate 3 and the intermediate plate 14, and the coolant inlet 16 and the coolant outlet 17 are correspondingly arranged on both sides of the partition 15 on the end plate 3 and the intermediate plate 14.

[0049] The above-mentioned technical solution of this embodiment focuses on solving the problem of failure of the sealing gasket located at the weakest link among all the sealing gaskets in the alkaline water hydrogen production electrolyzer. By providing a cooling cavity inside the end plate and the intermediate plate 14, the temperature environment of the sealing gasket 5 pressed against the end pressure plate 3 and the intermediate plate 14 is improved, thereby increasing the service life of the sealing gasket 5 at this location. Therefore, when the cooling cavity 13 is only provided on the end pressure plate 3 and the intermediate plate 14, and no cooling cavity 13 is provided on the remaining plates 4, the weak link problem in the "barrel theory" (i.e., the problem that early damage to the sealing gasket 5 at the end pressure plate 3 and the intermediate plate 14 leads to early failure of the entire electrolyzer) is strengthened, so that the service life of the sealing gasket 5 pressed against the end pressure plate 3 and the intermediate plate 14 is close to or exceeds the service life of the sealing gasket located between the remaining plates 4, thereby greatly improving the overall service life of the alkaline water hydrogen production electrolyzer.

[0050] See also Figure 1, which is a typical structure of the end plate inlet and outlet of the existing alkaline water electrolyzer, including end pressure plates 1 at both ends, tightening bolts 12, disc springs 9, end plates 3, sealing gaskets 5, plates 4, diaphragms 10, oxygen evolution electrodes 6, hydrogen evolution electrodes 7, etc., and is also provided with an intermediate plate 14 for the inlet and outlet of alkaline solution, hydrogen, and oxygen.

[0051] See also Figure 2 and 3 , which is the present invention relative to Figure 1 The improvement is that a cooling cavity 13 is made inside the end plate 3 and the intermediate plate 14. The cooling cavity 13 is arranged inside the pole frame 26 of the end plate 3 and the intermediate plate 14 (the end face of the pole frame 26 is pressed against the sealing gasket 5). The cooling cavity 13 is arranged in a closed annular shape and is not connected to the electrolysis chamber. It is used to cool the sealing gasket 5 pressed against the end face of the pole frame 26 of the end plate 3 and the intermediate plate 14. The cooling cavity 13 has two coolant inlet and outlet ports at the outer edge of the pole frame of the end plate 3 and the intermediate plate 14 for connecting to the circulating cooling system. In order to ensure that the coolant can circulate in an annular manner, a cooling cavity partition 15 is provided in the annular cooling cavity (see Figure 2 ).

[0052] See also Figure 2 and 3 The end surfaces of the end plates 3 and the intermediate plates 14 of the alkaline water hydrogen production electrolyzer are also provided with an alkali liquid channel 21 for the entry and exit of alkali liquid. The channel adopts the structure of an end surface countersunk hole 22, and a through groove 23 is radially provided on the end surface countersunk hole 22 to connect to the electrolysis chamber. In addition, each electrode plate 4 and sealing gasket 5 of the alkaline water hydrogen production electrolyzer is also sequentially provided with an alkali liquid through hole 24 connected to the end surface countersunk hole 22. The alkali liquid through hole 24, the end surface countersunk hole 22, and the through groove 23 are sequentially connected to form an alkali liquid channel 21 connecting to the electrolysis chamber. The structure of the alkali liquid channel 21 provided on the end surfaces of the end plates 3 and the intermediate plates 14 can avoid interference with the annular structure space of the cooling chamber 13.

[0053] The end plates 3 and the intermediate plates 14 include a plate body 25 of the end plates and the intermediate plates 14 and a pole frame 26 of the end plates and the intermediate plates 14 connected to the outer edges of the plate bodies 25 of the end plates and the intermediate plates 14. The structures can be either integral or assembled and welded. For example, when the end plates and the intermediate plates 14 adopt an assembled and welded structure, an annular groove can be provided along the circumferential direction on the inner hole surface of the pole frame 26, a partition 15 is first welded into the annular groove, and then the outer circle of the plate body 25 of the end plates and the intermediate plates 14 is fitted into the inner hole of the pole frame 26, thereby sealing the notch of the annular groove at the inner hole of the pole frame 26, and then a closed annular cooling chamber 13 is formed by welding.

[0054] See also Figure 4The present invention provides a technical solution for a circulating cooling system. The circulating cooling system consists of a heat exchanger 20, a circulating pump 19, and cooling circulation piping (insulated piping). The system is connected to the coolant inlet and outlet ports 16 and 17 of the electrolyzer's end plates 3 and intermediate plate 14. Utility circulating cooling water, essential for hydrogen production by water electrolysis, is also connected to the heat exchange end of heat exchanger 20. Preferably, the piping connecting the circulating cooling system to the electrolyzer is non-conductive, insulated piping, and the coolant passing through it is also non-conductive. The coolant can be deionized water, silicone oil, ethanol, or other non-conductive fluids.

[0055] Operation method: Start the circulating cooling system and pass the coolant into the cooling chamber 13 inside the end plate 3 and the intermediate plate 14 of the alkaline water hydrogen production electrolyzer to remove the local heat of the sealing gasket 5 at the pole frame of the end plate 3 and the intermediate plate 14 to cool the sealing gasket 5; the heat taken out of the cooling chamber 13 is taken away by the public utility circulating cooling water through the heat exchanger 20, thereby realizing the cooling of the circulating cooling water.

[0056] See also Figure 5 , which is another technical solution of a circulating cooling system. The electrolyte output by the alkali liquid circulation pump 27 for realizing the alkali liquid circulation of the alkaline water hydrogen production electrolyzer does not directly enter the electrolyzer, but first enters the cooling cavity 13 inside the end electrode plate 3 and the intermediate electrode plate 14 through a pipeline, thereby cooling the sealing gasket pressed against the pole frame 26 of the end electrode plate 3 and the intermediate electrode plate 14, and then comes out of the cooling cavity 13 of the end electrode plate 3 and the intermediate electrode plate 14 through a pipeline and enters the electrolyzer again from the intermediate electrode plate 14.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An alkaline water hydrogen production electrolyzer with a cooling device, characterized in that: A cooling cavity is provided in the end plates at both ends of the alkaline water hydrogen production electrolyzer, or a cooling cavity is provided in both the end plates and the intermediate plates at both ends of the alkaline water hydrogen production electrolyzer; wherein the cooling cavity is connected to a circulating cooling system.

2. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 1, characterized in that: The cooling cavities of the end plates and the intermediate plates are arranged at axially adjacent positions where the sealing gaskets are abutted.

3. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 2, characterized in that: The cooling cavity in the end plate and the intermediate plate is arranged in a closed ring shape at an axially adjacent position where the sealing gasket is abutted, and is used to cool the sealing gasket pressed against its end face, so that the compressive strength of the sealing gasket pressed against the end face of the end plate and the intermediate plate is greater than the compressive strength of the sealing gasket located between the remaining plates.

4. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 3, characterized in that: A coolant inlet and a coolant outlet are respectively provided at the outer edges of the end plate and the intermediate plate, which are connected to the cooling cavity inside the end plate and the intermediate plate. The coolant inlet and the coolant outlet are connected to the circulating cooling system through pipelines.

5. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 4, characterized in that: The circulating cooling system is a circulating cooling system that adopts a heat exchange method of a heat exchanger, which includes a cooling circulation pipeline connected to the coolant inlet and coolant outlet on the end plate and the intermediate plate, and a coolant circulation pump and a heat exchanger respectively arranged on the cooling circulation pipeline.

6. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 5, characterized in that: The circulating liquid used in the circulating cooling system is a non-conductor; at the same time, the pipeline connecting the circulating cooling system and the electrolytic cell adopts an insulating pipeline.

7. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 2, characterized in that: The circulating cooling system is a circulating cooling system that uses the circulating alkali liquid of the hydrogen production system for heat exchange. The cooling method of the circulating cooling system that uses the circulating alkali liquid of the hydrogen production system for heat exchange is as follows: the low-temperature circulating alkali liquid to be introduced into the alkaline water hydrogen production electrolytic cell is first introduced into the cooling cavity of the end plate and the intermediate plate to remove heat, and then enters the electrolytic cell for electrolysis reaction, so as to cool the sealing gasket pressed against the end surface of the end plate and the intermediate plate.

8. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 4, characterized in that: The circulating cooling system that utilizes the circulating alkali liquid of the hydrogen production system for heat exchange includes an alkali liquid circulation pump of the hydrogen production system. The alkali liquid output end of the alkali liquid circulation pump is connected to the coolant inlet on the end plate and the intermediate plate through a pipeline. After the heat is taken away by the cooling cavity, the coolant outlet on the end plate and the intermediate plate is connected to the interior of the alkaline water hydrogen production electrolyzer through a pipeline.

9. The alkaline water hydrogen production electrolyzer with a cooling device according to claim 3, characterized in that: A partition is provided in the cooling cavity arranged in a closed annular shape inside the end plate and the middle plate, and the coolant inlet and the coolant outlet are correspondingly arranged on both sides of the partition on the end plate and the middle plate.

Images