CN115261905A - High-pressure type water electrolysis hydrogen production device - Google Patents

Abstract

The invention discloses a high-pressure water electrolysis hydrogen production device, comprising a pressing device and an electrolytic cell, the pressing device applies sealing pressure to both ends of the electrolytic cell; a plurality of pole plate assemblies are stacked in sequence in the pressing device, A lip seal and a limit ring are concentrically arranged between two adjacent pole plate assemblies, the limit ring is sleeved on the outside of the lip seal, and the two adjacent pole plate assemblies are arranged on both sides of the limit ring at intervals. Insulation, the inner ring wall of the limit ring is used to constrain the lip seal ring; the water pressure strength of the electrolytic cell of the present invention can reach 10MPa and above, and the safety pressure of the air-tightness test can reach 8MPa and above. The principle of electrolytic cell sealing is to make changes from the aspect of the electrolytic cell sealing system, to overcome the difficulty of manufacturing and sealing of super-large electrolytic cell equipment, to overcome the problem of deflection and deformation during the use of medium and large-scale electrolytic cell equipment, and to meet the market's demand for high-pressure type, especially high-pressure electrolytic cell equipment. Demand for medium and large water electrolysis hydrogen production equipment.

Description

A high-pressure water electrolysis hydrogen production device

technical field

The invention relates to the field of water electrolysis hydrogen production equipment, in particular to a high-pressure water electrolysis hydrogen production device in the field of alkaline water electrolysis hydrogen production electrolyzer equipment.

Background technique

Water electrolysis hydrogen production is one of many hydrogen production routes, and alkaline water electrolysis hydrogen production is the mainstream process of water electrolysis hydrogen production technology route. And implementation, water electrolysis hydrogen production, especially alkaline water electrolysis hydrogen production process will occupy an important position in the market for a long time in the future, electrolyzer is the core part of water electrolysis hydrogen production equipment in terms of cost and operation .

The technical level and equipment scale of alkaline pressure water electrolysis hydrogen production equipment in my country lead the world. Generally, the operating pressure of medium and large-scale equipment is not greater than 1.6Mpa, which cannot operate under higher pressure; most foreign equipment operates under normal pressure. There are two development routes. The pressure of hydrogen in the transportation process and the terminal demand is often high. The general demand is about 4MPa or more. The process requires a compressor to increase the gas supply pressure at the hydrogen production end, thereby increasing equipment investment and energy consumption.

Sealing is the most important problem faced by water electrolysis hydrogen production electrolyzer equipment, especially for large-scale electrolyzer equipment. Whether the sealing system can operate stably for a long time is the prerequisite for determining whether the electrolyzer can operate normally and stably. At present and for a long time, the equipment of alkaline water electrolysis hydrogen production electrolyzers in the industry is sealed in the form of flat sealing structure combined with insulating modified plastic sealing gaskets. The pressure filter structure of water electrolysis hydrogen production electrolyzers results in hundreds of small chambers in the electrolyzer. Hundreds of seals, and one seal failure will cause the entire equipment to shut down, which directly affects the operation safety of the water electrolysis hydrogen production equipment, and is also an obstacle to the larger development of water electrolysis hydrogen production electrolyzer equipment.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a high-pressure water electrolysis hydrogen production device, which breaks through the upper limit of the sealing capacity of the existing medium and large electrolytic cell equipment, overcomes the problem of sealing the ultra-large electrolysis equipment, and realizes the electrolytic hydrogen production device Stable operation under high pressure.

The present invention is achieved through the following technical solutions:

A high-pressure water electrolysis hydrogen production device, including a pressing device and an electrolytic cell, the pressing device exerts sealing pressure on both ends of the electrolytic cell;

The electrolytic cell includes several pole plate assemblies, electrolytic chambers are arranged on both sides of the pole plate assemblies, and several pole plate assemblies are stacked in sequence in the pressing device, and concentric lips are pressed between two adjacent pole plate assemblies. Shaped sealing ring and limit ring;

The lip-shaped sealing ring and the limit ring are sleeved on the outside of the electrolytic chamber in sequence from the inside to the outside. The inner ring wall of the limit ring is used to constrain the lip-shaped seal ring in the circumferential direction. Several limit rings are arranged coaxially. Two adjacent pole plate assemblies are arranged at intervals on both sides of the limit ring and insulated, and a diaphragm cloth is arranged between two adjacent electrolytic chambers of two adjacent pole plate assemblies, and the edges of the diaphragm cloth are pressed on the two poles between board components.

Preferably, the plate assembly includes a plate frame, a flat plate, an anode sub-net, a cathode sub-net and a support net;

The flat plate is fitted in the inner hole of the plate frame, the edge of the flat plate is connected with the hole wall of the plate frame, and the anode auxiliary pole net and the cathode auxiliary pole net are arranged on both sides of the pole plate frame and fixed , the support net is arranged on both sides of the flat plate, and the support net is used for supporting and positioning the anode sub-net and the cathode sub-net.

Preferably, medium channels are provided on both sides of the plate frame for allowing the working fluid in the electrolytic chamber to enter the lip cavity of the lip seal ring.

Preferably, a channel pressing sheet is provided on the medium channel.

Preferably, both sides of the pole plate assembly are respectively provided with sealing grooves for installing a lip seal ring; one side of the pole plate assembly is provided with a limit groove for installing a limit ring.

Preferably, the lip-shaped sealing ring includes a circumferentially closed sealing body, the outer wall and the inner wall of the sealing body are respectively provided with an annular outer lip and an inner lip, and the inner wall of the sealing body is provided with a sealing lip chamber, and the two seals The lip cavities are arranged symmetrically on both sides of the inner lip.

Preferably, the sealing body is arranged in the sealing grooves of two adjacent plate frames, the outer lip and the inner lip are press-fitted between two adjacent plate frames, and the outer wall of the outer lip and the limit ring The inner wall abuts.

Preferably, the inner lip is provided with corrugated compensation joints.

Preferably, the corrugated compensation joint 21 is an annular structure, and its section is an arc structure with equal thickness.

Preferably, the limiting ring is made of hard insulating material.

Compared with the prior art, the present invention has the following beneficial technical effects:

A high-pressure water electrolysis hydrogen production device provided by the present invention installs a lip seal ring and a limit ring between two adjacent electrode plate assemblies, and isolates the two electrode plate assemblies through the limit ring for insulation Function, secondly, the limit ring can control the compression amount of the two plate assemblies on the lip seal ring, and ensure that the compression amount of each lip seal ring is the same, so as to avoid excessive compression force and cause the lip seal ring to fail. In addition , All the limit rings are set coaxially, the limit rings can provide support when the electrolyzer is fastened, greatly enhance the overall installation rigidity of the electrolyzer, and avoid deflection during the installation and long-term use of the electrolyzer.

Further, the lip seal is used as the main sealing element of the hydrogen production device, and the lip seal is located between the two plate assemblies to insulate the two adjacent plate assemblies and avoid contact between the two plate assemblies. Short circuit; Secondly, the lip seal can prevent the medium leakage of the electrolysis chamber and ensure the overall sealing performance of the electrolysis.

Description of drawings

Fig. 1 is the structural diagram of high pressure type water electrolysis hydrogen production device of the present invention;

Fig. 2 is a sealing structure diagram of the high-pressure water electrolysis hydrogen production device of the present invention;

Fig. 3 is the end view of the pole plate assembly of the present invention;

Fig. 4 is the structural representation of pole plate assembly of the present invention;

Fig. 5 is a schematic structural view of the lip seal ring of the present invention.

In the figure: tie rod 1; nut 2; gasket 3; insulating gasket 4; left end plate 5; left end plate assembly 6; insulating tube 7; right end plate 8; right end plate assembly 9; lip seal ring 10; diaphragm cloth 11; pole plate assembly 12; limit ring 13; pole plate frame 14; anode sub pole net 15; support net 16, flat plate 17; cathode sub pole net 18; Compensation section 21; lip chamber 22; inner lip 23; sealing body 24; sealing groove 25; limit groove 26.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.

Referring to Figures 1-5, a high-pressure water electrolysis hydrogen production device includes a compacting device and an electrolytic cell arranged inside it, and the compacting device is used to apply sealing pressure to the electrolytic cell.

The electrolytic cell includes a pole plate assembly 12, a lip seal 10 and a limit ring 13; coaxial electrolytic chambers are arranged on both sides of the pole plate assembly, and several pole plate assemblies 12 are stacked and pressed in sequence In the pressing device, a concentric lip seal ring 10 and a limit ring 13 are arranged between two adjacent pole plate assemblies, and the two adjacent pole plate assemblies are non-contact connected and insulated, and the limit ring 13 is sleeved with The outer side of the lip seal 10, the space surrounded by the lip seal 10 and the two adjacent electrolysis chambers of two adjacent plate assemblies 12 forms an electrolysis chamber, and a diaphragm cloth is arranged in the electrolysis chamber for isolating the two electrolysis chambers. In the sealed state of the electrolytic chamber, the inner ring wall of the limit ring 13 is used to constrain the lip seal ring 10 in the circumferential direction.

The plate assembly 12 includes a plate frame 14, a flat plate 17, a support net 16, an anode sub-pole net 15, a cathode sub-pole net 18 and a channel press piece 19; the pole plate frame 14 has a circular ring with a certain thickness , the flat plate 17 is fitted in the inner hole of the plate frame 14 and is located at the axial center of the ring, the edge of the flat plate 17 is connected with the hole wall of the plate frame 14, the anode sub-pole net 15 and the cathode The auxiliary pole net 18 is arranged on both sides of the pole plate frame 14, and the edges of the anode auxiliary pole net 15 and the cathode auxiliary pole net 18 are affixed to the two ends of the pole plate frame 14, and both sides of the flat pole plate 17 are provided with supports Net 16, the support net 16 is used for supporting and positioning the anode sub-pole net 15 and the cathode sub-pole net 18, and two electrolytic chambers are formed between the anode sub-pole net 15 and the cathode sub-pole net 18 and the flat plate 17 respectively Each junction of described pole plate frame 14, flat pole plate 17, support net 16, anode sub pole net 15, cathode sub pole net 18 is mutually welded to form pole plate assembly 12, can reduce the contact resistance between parts, on the other hand The number of parts installed in the electrolytic cell can be reduced, and the convenience of assembly can be improved.

The two ends of the plate frame 14 are provided with a sealing groove 25 for installing the lip seal 10, and one of the sides is provided with a limiting groove 26 for installing the limiting ring 13. The diameter of the limiting groove 26 is greater than the diameter of the sealing groove, and the limit The bit groove 26 is located on one side of the cathode sub-pole net 18 or the anode sub-pole net 15. In addition, both sides of the plate frame 14 are provided with a medium channel for the medium in the electrolysis area to freely enter the lip seal ring 10 to seal the lip cavity. The medium channel One end communicates with the electrolytic chamber, and the other end communicates with the sealing groove 25.

The lip seal 10 includes a circumferentially closed sealing body, the outer wall and the inner wall of the sealing body are respectively provided with an annular outer lip 20 and an inner lip 23 and are located on the same radial plane, and the sealing body is close to the side of the electrolytic chamber There are sealing lip cavities 22, two sealing lip cavities 22 are symmetrically arranged on both sides of the inner lip 23, and the opening position of the sealing lip cavity 22 and the contact position of the inner lip 23 transition smoothly.

The sealing body is located in the sealing grooves 25 of two adjacent plate frames 14, the outer lip 20 and the inner lip 23 are clamped in two adjacent plate frames 14, and the edge of the outer lip 20 is in contact with the limit The inner ring wall of the bit ring abuts, and the opening end of the sealing lip cavity 22 communicates with the electrolytic cavity through a medium channel. The medium channel is located on one side of the inner lip 23. When the electrolyte enters the sealing lip cavity 22 under pressure, the lip cavity The chamber 22 deforms and expands under the pressure of the electrolyte, which increases the volume of the entire sealing body. The sealing body is constrained by the plate assembly on both sides, which can effectively increase the sealing pressure between the sealing body and the plate assembly, thereby improving the sealing performance. .

The inner lip 23 is provided with a corrugated compensation joint 21, and the corrugated compensation joint 21 is located on the side of the inner lip 23 close to the lip chamber 22, and is used to increase the compression deformation of the inner lip in a sealed state , the compensation structure can ensure that the inner lip of the lip seal ring will not be torn due to internal and external compression and pulling under the working stress state. The corrugated compensating joint 21 is an annular structure, and its cross-section is an arc structure of equal thickness, and is arranged concentrically with the sealing body. The corrugated compensating joint 21 forms an annular convex structure on one side of the inner lip 23, and the other An annular groove structure is formed on one side, and the inner lip is compressed and deformed in the working state, and the corrugated compensation joint 21 is stretched under pressure to relieve the pulling deformation caused by the internal and external compression of the inner lip, avoid tearing and damage to the inner lip, and improve the overall The service life of the lip seal.

The lip-shaped sealing ring 10 is a sealing element of a high-pressure water electrolysis hydrogen production device, and its material is rubber, plastic or a modified product thereof. The plate assembly plays an insulating role to avoid the short circuit of the two contacting plate assemblies 12; secondly, the lip seal 10 provides the inner seal and the outer seal for the electrolysis chamber, and the inner seal is to seal the hydrogen and oxygen generated in the electrolysis chamber so that they do not cross each other. The outer seal is to seal the electrolytic cell and the electrolytic chamber without leakage, so as to ensure the overall sealing performance of the electrolysis. The lip seal ring 10 is mainly composed of two lip-shaped chambers, an inner lip and an outer lip, and the two lip chambers are used for external sealing. , the inner lip is used for inner sealing, and the outer lip is used for dial adjustment during the installation process of the lip seal 10 to ensure that the installation posture of the lip seal 10 is correct.

The limiting ring 13 is made of insulating hard material, which can operate at about 100°C without any change in material properties. The material is epoxy resin or ceramics, and the thickness of the limiting ring 13 is greater than that of the limiting groove The depth of 26 makes the end face of the limit ring 13 protrude from the end face of the plate frame 14, so that two adjacent plate frames 14 maintain a certain gap, and the limit ring 13 separates the two adjacent plate assemblies 12 Play an insulating role. Secondly, it is used to control the amount of compression of the lip seals 10 before the two plate assemblies, to ensure that the amount of compression deformation of all lip seals 10 is the same, and to constrain the lip seals 10 under internal pressure and outwards in the working state Extrusion; In addition, the limit ring 13 is made of hard material, which can provide a super large preload for two adjacent plate assemblies without affecting the sealing performance, and the excessive compression force will not cause excessive compression of the lip seal ring 10 Failure, the limit ring 13 can provide supporting force when the electrolytic cell is fastened, greatly enhance the overall installation rigidity of the electrolytic cell, and avoid deflection during installation and long-term use of the electrolytic cell.

Referring to Fig. 1 again, the pressing device includes a pull rod and an end plate, and a plurality of plate assemblies are stacked to form an electrolytic cell, and two adjacent plate assemblies are provided with a diaphragm cloth 11 for separating the positive and negative sides of the electrolytic chamber. hydrogen and oxygen, to ensure the purity of hydrogen and oxygen substances, the two ends of the electrolytic cell are respectively provided with a left end plate assembly 6 and a right end plate assembly 9, and the outer sides of the left end plate assembly 6 and the right end plate assembly 9 are respectively provided with a left end The plate 5 and the right end plate 8, the left end plate 5 and the right end plate 8 are connected by a plurality of pull rods 1, the two ends of the pull rods are provided with gaskets and insulating gaskets, and the nuts 2 are applied to the left end plate 5 and the right end plate 8 to make the left end The plate 5 and the right end plate 8 hold the electrolytic cell.

The left end plate assembly 6 and the right end plate assembly 9 have the same structure. Compared with the plate assembly 12, the left end plate assembly 6 and the right end plate assembly 9 have a thicker sheet material, and a flat plate 17 is welded on both sides of the workpiece. , the flat plate 17 and the left end plate assembly 6 or the right end plate assembly 9 form an inner chamber, which mainly acts as a buffer for the electrolyte in the electrolytic cell and improves the stability of the electrolytic cell. The left end plate 5 and the right end plate 8 are used to clamp the entire electrolytic cell, and the left end plate 5 or the right end plate 8 are provided with interfaces for the electrolyte and the generated gas, which are connected to the boundary. The entire electrolytic cell applies fastening force through auxiliary parts such as tie rod 1 and nut 2. Compared with conventional electrolytic cells, there is no need for disc springs at both ends of the electrolytic cell, and no compensation for thermal expansion and contraction can ensure the sealing performance of the cell body.

A high-pressure water electrolysis hydrogen production device of the present invention carries out experimental pressure measurement, the water pressure strength pressure of the electrolytic cell can reach 10MPa and above, the air pressure airtightness test safety pressure can reach 8MPa and above, and the sealing pressure of the electrolytic cell is far greater than The sealed operating pressure of electrolyzers with conventional structures in the market. In addition, based on safety considerations, no higher-level pressure tests have been carried out. According to the current pressure measurement results, it is possible to maintain sealing under higher pressures; The gaskets of the tank sealing system are for one-time use, and cannot be reused after disassembly and assembly of the electrolyzer, and the maintenance cost is too high. However, sealing components such as lip seals and limit rings can be used repeatedly, which can greatly reduce the equipment of the electrolyzer. Repair fees. In addition, the limit ring is made of insulating hard material, so there is no need to worry about excessive compression of the gasket due to excessive pressure when the electrolytic cell is pre-tightened. The problem of deflection in the long-term use of the sealed type electrolyzer has broken through the design shortcoming of large-scale and ultra-large electrolyzers.

The above content is only to illustrate the technical ideas of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solutions according to the technical ideas proposed in the present invention shall fall within the scope of the claims of the present invention. within the scope of protection.

Claims (10)

1. A high-pressure type water electrolysis hydrogen production device is characterized by comprising a pressing device and an electrolytic cell, wherein the pressing device is used for applying sealing pressure to two ends of the electrolytic cell;

the electrolytic bath comprises a plurality of polar plate assemblies, electrolytic cavities are arranged on two sides of the polar plate assemblies, the polar plate assemblies are sequentially overlapped in a pressing device, and a concentric lip-shaped sealing ring and a limiting ring are pressed between every two adjacent polar plate assemblies;

the lip-shaped sealing ring and the limiting ring are sequentially sleeved on the outer side of the electrolytic cavity from inside to outside, the inner ring wall of the limiting ring is used for annularly constraining the lip-shaped sealing ring, the limiting rings are coaxially arranged, two adjacent polar plate assemblies are arranged on two sides of the limiting ring at intervals and are insulated, diaphragm cloth is arranged between two adjacent electrolytic cavities of the two adjacent polar plate assemblies, and the edge of the diaphragm cloth is pressed between the two polar plate assemblies.

2. The high-pressure type water electrolysis hydrogen production device according to claim 1, wherein the polar plate assembly comprises a polar plate frame, a flat polar plate, an anode auxiliary polar net, a cathode auxiliary polar net and a support net;

the flat polar plate is assembled in an inner hole of the polar plate frame, the edge of the flat polar plate is connected with the hole wall of the polar plate frame, the anode auxiliary polar net and the cathode auxiliary polar net are arranged on two sides of the polar plate frame and fixedly connected, the supporting nets are arranged on two sides of the flat polar plate and used for supporting and positioning the anode auxiliary polar net and the cathode auxiliary polar net.

3. The high-pressure type water electrolysis hydrogen production device according to claim 2, wherein the two sides of the polar plate frame are provided with medium channels for enabling working media in the electrolysis cavity to enter the lip cavity of the lip-shaped sealing ring.

4. The apparatus as claimed in claim 3, wherein the medium passage is provided with a passage pressing piece.

5. The high-pressure type hydrogen production device by water electrolysis as claimed in claim 1, wherein, two sides of the pole plate assembly are respectively provided with a sealing groove for installing a lip-shaped sealing ring; and one side of the pole plate assembly is provided with a limiting groove for mounting a limiting ring.

6. The high-pressure type water electrolysis hydrogen production device according to claim 5, wherein the lip-shaped sealing ring comprises an annularly closed sealing body, the outer wall and the inner wall of the sealing body are respectively provided with an annular outer lip edge and an annular inner lip edge, the inner wall of the sealing body is provided with two sealing lip cavities, and the two sealing lip cavities are symmetrically arranged on two sides of the inner lip edge.

7. The high-pressure type water electrolysis hydrogen production device according to claim 6, wherein the sealing body is arranged in the sealing grooves of two adjacent polar plate frames, the outer lip edge and the inner lip edge are pressed between the two adjacent polar plate frames, and the outer wall of the outer lip edge is abutted against the inner wall of the limiting ring.

8. The apparatus of claim 7, wherein the inner lip is provided with a corrugated compensation joint.

9. The apparatus as claimed in claim 8, wherein the corrugated compensation joint 21 has an annular structure with a circular arc structure with a cross section of equal thickness.

10. The device for producing hydrogen by electrolysis of water under high pressure as claimed in claim 1, wherein the spacing ring is made of hard insulating material.

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