PEM-based alkaline water electrolysis hydrogen production system
By using structures such as separation membranes and lifting cylinders in the alkaline water electrolysis hydrogen production system, the problems of mixing oxygen and hydrogen and insufficient sealing of electrolytic cells are solved, high-purity separation and recovery of hydrogen are achieved, and the overall performance of the system is improved. .
Patent Information
- Application Number
- CN202420433051.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-06
AI Technical Summary
In the existing alkaline water electrolysis hydrogen production system, it is difficult to effectively separate oxygen and hydrogen, resulting in a decrease in hydrogen purity and insufficient sealing at the upper end of the electrolytic cell, resulting in the entry of external polluted air and reducing the quality of hydrogen.
Design an alkaline water electrolytic hydrogen production system based on PEM, adopts the first and second layer structures of separation membrane to avoid mixing oxygen and hydrogen, and improves the sealing degree of the electrolytic cell by lifting cylinders and double-layer extrusion sealing structures to ensure hydrogen and Effective separation and recovery of oxygen.
It effectively improves the purity of hydrogen and the separation and recycling effect, while enhancing the sealing of the electrolytic cell, preventing external pollution from entering, and improving the quality of hydrogen.
Smart Images
Figure CN222205472U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of alkaline water electrolysis hydrogen production, in particular to an alkaline water electrolysis hydrogen production system based on PEM. Background Art
[0002] Alkaline water electrolysis hydrogen production system is a technology that decomposes water molecules into hydrogen and oxygen.
[0003] Among them, the PEM-based alkaline water electrolysis hydrogen production system is a relatively commonly used method. This method can realize the continuous production of hydrogen and achieve a step-by-step and continuous improvement process in the same scenario, saving energy and improving hydrogen efficiency.
[0004] However, in the existing alkaline water electrolysis hydrogen production system, the oxygen generated by the reduction at the cathode below tends to flow upward and mix with the hydrogen generated by the reduction at the anode above, which will affect the purity of the hydrogen produced by the alkaline water electrolysis hydrogen production system. Hydrogen and oxygen cannot be effectively separated, discharged and recycled, which greatly reduces the separation and recycling effects of green hydrogen production and oxygen production.
[0005] In addition, in the process of producing hydrogen by alkaline water electrolysis, the existing alkaline water electrolysis hydrogen system has a low overall sealing degree for the upper opening of the electrolytic cell, which causes external polluted air to enter the electrolytic cell, thereby reducing the quality of hydrogen produced by the alkaline water electrolysis hydrogen system.
[0006] The above problems are widespread and urgently need to be improved. Utility Model Content
[0007] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose an alkaline water electrolysis hydrogen production system based on PEM.
[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0009] A PEM-based alkaline water electrolysis hydrogen production system is designed, comprising an electrolytic cell, wherein a first layer of separation membrane and a second layer of separation membrane are arranged in the inner cavity of the electrolytic cell, a mounting plate and a sealing side ring gasket are arranged on the outer wall of the electrolytic cell, a lifting cylinder is arranged on the mounting plate, a lifting plate is arranged on the lifting cylinder, a slot sealing cover is arranged on the lifting plate, an outer sealing strip and an inner sealing strip are arranged on the slot sealing cover, an outer extrusion slot and an inner extrusion slot are opened on the electrolytic cell, a hydrogen recovery pipe and an anode are arranged on the slot sealing cover, a second valve is arranged on the hydrogen recovery pipe, a cathode and an oxygen recovery pipe are arranged on the electrolytic cell, a first valve is arranged on the oxygen recovery pipe, and a conductive rod and a controller are arranged on the electrolytic cell.
[0010] Furthermore, the mounting plate and the lifting cylinder form a group, which are two groups symmetrical on the left and right, and the telescopic rod of the lifting cylinder is fixedly arranged on the lifting plate.
[0011] Furthermore, the first separation membrane layer and the second separation membrane layer are both made of proton exchange membrane material.
[0012] Furthermore, the sealing side ring gasket is made of NBR nitrile rubber, and the sealing side ring gasket is arranged around the outer side wall of the electrolytic cell.
[0013] Furthermore, the outer extrusion groove and the outer sealing strip form a group, and the inner extrusion groove and the inner sealing strip form a group.
[0014] Furthermore, the outer sealing strip and the inner sealing strip are both made of highly elastic vulcanized rubber, and the vertical height dimensions of the outer sealing strip and the inner sealing strip are not less than the vertical height dimensions of the outer extrusion groove and the inner extrusion groove.
[0015] Furthermore, a chamfered surface is provided on the inner side wall of the groove sealing cover, and the inclination angle of the chamfered surface is forty-five degrees.
[0016] The utility model proposes a PEM-based alkaline water electrolysis hydrogen production system, which has the following beneficial effects:
[0017] 1. The utility model arranges a single-layer separation membrane and a double-layer separation membrane structure in the inner cavity of the electrolytic cell, thereby effectively preventing the oxygen generated by reduction at the lower cathode from easily flowing upward and mixing with the hydrogen generated by reduction at the upper anode, thereby effectively improving the purity of the hydrogen produced by the alkaline water electrolysis hydrogen production system. At the same time, the hydrogen and oxygen produced by direct electrolysis of liquid alkaline water can be effectively separated, discharged and recycled, further improving the separation and recycling effects of green hydrogen production and oxygen production.
[0018] 2. The utility model provides a symmetrical lifting cylinder, a double-layer extrusion sealing structure and a side wall sealing structure. During the process of hydrogen production by alkaline water electrolysis, the tank sealing cover is electrically and stably covered on the electrolytic cell, and the double-layer extrusion sealing and side wall sealing effects are achieved, thereby improving the overall sealing of the upper end opening of the electrolytic cell, and effectively preventing external polluted air from entering the electrolytic cell and reducing the quality of hydrogen produced by the alkaline water electrolysis hydrogen production system.
[0019] 3. The utility model provides a chamfered surface structure on the inner side wall of the groove sealing cover, which greatly improves the effect of the groove sealing cover being smoothly squeezed and clamped on the outer side wall of the sealing side ring gasket. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a first-view stereoscopic diagram of the overall structure of the utility model;
[0021] Figure 2 It is a schematic diagram of the overall structure of the utility model from top view;
[0022] Figure 3 For the utility model Figure 2 Middle AA section;
[0023] Figure 4 For the utility model Figure 3 Enlarged view of point B in the middle;
[0024] Figure 5 For the utility model Figure 1 A three-dimensional view of the middle tank sealing cover;
[0025] Figure 6 This is a stereoscopic diagram of the overall structure of the utility model from a second viewing angle.
[0026] Figure 7 It is a block diagram of the utility model.
[0027] In the figure: 1 electrolytic cell; 10 controller; 11 outer extrusion groove; 12 inner extrusion groove; 13 cathode; 14 conductive rod; 2 oxygen recovery pipe; 21 first valve; 3 mounting plate; 31 lifting cylinder; 32 lifting plate; 4 slot sealing cover; 41 outer sealing strip; 410 chamfered surface; 42 inner sealing strip; 43 anode; 5 hydrogen recovery pipe; 51 second valve; 6 sealing side ring gasket; 7 separation membrane layer 1; 8 separation membrane layer 2. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0029] Reference Figure 1-7A PEM-based alkaline water electrolysis hydrogen production system comprises an electrolytic cell 1, wherein a separation membrane layer 7 and a separation membrane second layer 8 are arranged in the inner cavity of the electrolytic cell 1, a mounting plate 3 and a sealing side ring gasket 6 are arranged on the outer wall of the electrolytic cell 1, a lifting cylinder 31 is arranged on the mounting plate 3, a lifting plate 32 is arranged on the lifting cylinder 31, a groove sealing cover 4 is arranged on the lifting plate 32, an outer sealing strip 41 and an inner sealing strip 42 are arranged on the groove sealing cover 4, an outer extrusion groove 11 and an inner extrusion groove 12 are opened on the electrolytic cell 1, and a groove sealing cover 4 is provided A hydrogen recovery pipe 5 and an anode 43, a second valve 51 is provided on the hydrogen recovery pipe 5, a cathode 13 and an oxygen recovery pipe 2 are provided on the electrolyzer 1, a first valve 21 is provided on the oxygen recovery pipe 2, a conductive rod 14 and a controller 10 are provided on the electrolyzer 1, the electrolyzer 1, the hydrogen recovery pipe 5, the anode 43, the cathode 13, the oxygen recovery pipe 2, the conductive rod 14, the second valve 51, and the first valve 21 are all related structures for an alkaline water electrolysis hydrogen production system, which are prior art. Some existing structures are not drawn and marked, and no further description is required.
[0030] The controller 10 is preset with a PLC and is electrically connected to the lifting cylinders 31 on both sides to achieve synchronous and stable lifting.
[0031] In detail, the mounting plate 3 and the lifting cylinder 31 form a group, which are two groups symmetrical on the left and right. The telescopic rod of the lifting cylinder 31 is fixed to the lifting plate 32 to achieve the electronically controlled vertical stability of the tank sealing cover 4 at the opening of the electrolytic cell 1.
[0032] Furthermore, both the first separation membrane 7 and the second separation membrane 8 are made of proton exchange membrane material, which is a special polymer membrane that selectively transmits protons. The double-layer separation membrane effect can ensure that the mixing of oxygen and hydrogen is avoided, thereby ensuring the separation and recycling of green hydrogen production and oxygen production.
[0033] Furthermore, the sealing side ring gasket 6 is made of NBR nitrile rubber, and the sealing side ring gasket 6 is arranged around the outer wall of the electrolytic cell 1. The NBR nitrile rubber material has high elastic sealing properties and can achieve an extrusion sealing effect between the outer wall of the electrolytic cell 1 and the inner wall of the cell sealing cover 4.
[0034] In more detail, the outer extrusion groove 11 and the outer sealing strip 41 form a group, and the inner extrusion groove 12 and the inner sealing strip 42 form a group, thereby achieving a double-layer sealing effect.
[0035] In general, the outer sealing strip 41 and the inner sealing strip 42 are both made of highly elastic vulcanized rubber, and the vertical height dimensions of the outer sealing strip 41 and the inner sealing strip 42 are not less than the vertical height dimensions of the outer extrusion groove 11 and the inner extrusion groove 12. Combined with the highly elastic extrusion deformation effect of the highly elastic vulcanized rubber material, the outer sealing strip 41 and the inner sealing strip 42 are respectively inserted into the outer extrusion groove 11 and the inner extrusion groove 12 for extrusion sealing.
[0036] Finally, a chamfered surface 410 is provided on the inner wall of the groove sealing cover 4 , and the inclination angle of the chamfered surface 410 is forty-five degrees, which greatly improves the effect of the groove sealing cover 4 being smoothly squeezed and stuck on the outer wall of the sealing side ring gasket 6 .
[0037] Working method: Before electrolysis and hydrogen production, a certain amount of liquid alkaline water is first injected into the electrolytic cell 1, and then the controller 10 is started. The PLC in the controller 10 will control the start of the lifting cylinders 31 on both sides to drive the telescopic rods of the lifting cylinders 31 to retract downward. When the tank sealing cover 4 is driven to cover the electrolytic cell 1 through the lifting plate 32, the PLC in the controller 10 will control the closing of the lifting cylinders 31 on both sides, and then the conductive rod 14 is energized, and the electrical energy of the conductive rod 14 is used to decompose water molecules into hydrogen ions and hydroxide ions. Then, these ions are reduced to generate hydrogen and oxygen at the anode 43 and the cathode 13 under the action of the electric field, and then the first valve 21 and the second valve 51 are opened respectively, and the oxygen The recovery gas pump connected to the recovery pipe 2 will quickly and effectively extract the reduced oxygen on the cathode 13 for recovery and storage for later use. At the same time, the recovery pump connected to the hydrogen recovery pipe 5 will quickly and effectively extract the reduced hydrogen on the anode 43 for recovery and storage. Moreover, the separation membrane layer 7 and the separation membrane layer 8 structure are set up to effectively prevent the oxygen generated by the reduction of the lower cathode 13 from easily flowing upward and mixing with the hydrogen generated by the reduction of the upper anode 43, thereby effectively improving the purity of the hydrogen produced by the alkaline water electrolysis hydrogen production system. At the same time, the hydrogen and oxygen produced by direct electrolysis of liquid alkaline water can be effectively separated, discharged and recovered, further improving the separation and recycling effects of green hydrogen production and oxygen production.
[0038] Moreover, when the slot sealing cover 4 is covered on the electrolytic cell 1 by the lifting cylinder 31, the outer sealing strip 41 will be squeezed and sealed and inserted into the outer extrusion groove 11, and at the same time, the inner sealing strip 42 will also be squeezed and sealed and inserted into the inner extrusion groove 12, and the inner wall of the slot sealing cover 4 will also be squeezed and contacted with the sealing side ring gasket 6 to seal, and the double-layer extrusion sealing and side wall sealing effects are achieved at the same time, thereby improving the overall sealing of the upper end opening of the electrolytic cell 1, and effectively preventing external polluted air from entering the electrolytic cell 1 and reducing the quality of hydrogen produced by the alkaline water electrolysis hydrogen production system.
[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A PEM-based alkaline water electrolysis hydrogen production system, comprising an electrolyzer (1), characterized in that: The inner cavity of the electrolytic cell (1) is provided with a first separation membrane layer (7) and a second separation membrane layer (8), the outer wall of the electrolytic cell (1) is provided with a mounting plate (3) and a sealing side ring gasket (6), the mounting plate (3) is provided with a lifting cylinder (31), the lifting cylinder (31) is provided with a lifting plate (32), the lifting plate (32) is provided with a tank sealing cover (4), the tank sealing cover (4) is provided with an outer sealing strip (41) and an inner sealing strip (42), The electrolytic cell (1) is provided with an outer extrusion groove (11) and an inner extrusion groove (12); the groove sealing cover (4) is provided with a hydrogen recovery pipe (5) and an anode (43); the hydrogen recovery pipe (5) is provided with a second valve (51); the electrolytic cell (1) is provided with a cathode (13) and an oxygen recovery pipe (2); the oxygen recovery pipe (2) is provided with a first valve (21); and the electrolytic cell (1) is provided with a conductive rod (14) and a controller (10).
2. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The mounting plate (3) and the lifting cylinder (31) form a group, which is two groups symmetrical on the left and right. The telescopic rod of the lifting cylinder (31) and the lifting plate (32) are fixedly arranged.
3. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The first separation membrane layer (7) and the second separation membrane layer (8) are both made of proton exchange membrane material.
4. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The sealing side ring gasket (6) is made of NBR nitrile rubber and is arranged around the outer side wall of the electrolytic cell (1).
5. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The outer extrusion groove (11) and the outer sealing strip (41) form a group, and the inner extrusion groove (12) and the inner sealing strip (42) form a group.
6. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The outer sealing strip (41) and the inner sealing strip (42) are both made of highly elastic vulcanized rubber, and the vertical height dimensions of the outer sealing strip (41) and the inner sealing strip (42) are not less than the vertical height dimensions of the outer extrusion groove (11) and the inner extrusion groove (12).
7. The PEM-based alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: A chamfered surface (410) is provided on the inner side wall of the groove sealing cover (4), and the chamfered surface (410) has an inclination angle of forty-five degrees.