CN217459611U

CN217459611U - PEM (proton exchange membrane) water electrolysis hydrogen production device with sealing structure

Info

Publication number: CN217459611U
Application number: CN202220192983.3U
Authority: CN
Inventors: 范峰强; 曹寅亮; 沈新龙; 张树国; 李伯球; 王胜平
Original assignee: Zhejiang Tianneng Hydrogen Energy Technology Co ltd
Current assignee: Zhejiang Tianneng Hydrogen Energy Technology Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-09-20
Anticipated expiration: 2032-01-24

Abstract

The utility model discloses a PEM (proton exchange membrane) water electrolysis hydrogen production device with a sealing structure, which comprises an anode plate and a cathode plate, wherein the anode plate and the cathode plate are both provided with central grooves, the central grooves of the anode plate and the cathode plate are oppositely arranged, the central grooves of the anode plate and the cathode plate are internally provided with evenly distributed bulges so as to form flow channels, the anode plate and the cathode plate are respectively provided with an anode current collector and a cathode current collector at the central grooves, and a proton exchange membrane is arranged between the anode current collector and the cathode current collector; the sealing structure comprises annular grooves which are respectively arranged on the anode plate and the cathode plate and surround the central groove, and sealing parts which are attached to the proton exchange membrane are arranged in the annular grooves. The utility model discloses under the prerequisite of not destroying sealing material structure, can effectively realize sealed, and can realize high strength material external seal and flexible material inner seal's self-adaptation high-pressure seal, simple process, the preparation is convenient, easily uses widely.

Description

PEM (proton exchange membrane) water electrolysis hydrogen production device with sealing structure

Technical Field

The utility model relates to an electrolytic water hydrogen manufacturing technical field, concretely relates to PEM electrolytic water hydrogen manufacturing installation with seal structure.

Background

The hydrogen production by water electrolysis of Proton Exchange Membrane (PEM) is one of the mature hydrogen production technologies, the produced hydrogen is convenient to transport, has high purity (more than 99.99 percent), can be directly used for fuel, carrier gas, reduction or protective gas and cooling medium, and is widely applied to various industries of national economy. The technology is applied to conventional hydrogen preparation in foreign countries, but the technical blockade of China is generally limited. The domestic PEM water electrolysis hydrogen production technology is not mature, and the problems of single combination mode, overlarge process loss, high manufacturing cost and the like exist.

The core technology of PEM water electrolysis hydrogen production is the manufacture of an electrolytic cell, and the material and combination mode thereof are very critical. The PEM electrolytic cell can directly output high-pressure hydrogen, the hydrogen outlet pressure of most electrolytic cells on the market is over 3.0MPa at present, foreign enterprises can even achieve over 35MPa, and the PEM electrolytic cell has extremely high requirements on the integral structure, particularly the sealing structure, of the electrolytic cell.

The electrolytic cell is mostly assembled by adopting an armless structure, PTFE or silica gel is usually filled between a polar plate light plate and a membrane electrode, and the sealing mode is mainly pressure fastening sealing. For example, patent specification No. CN111621806A discloses a PEM hydrogen production device by electrolyzing water, which comprises a special-shaped current collector, and further comprises a base, an anode special-shaped current collector, a proton exchange membrane module, a cathode special-shaped current collector and a top cover, which are connected in sequence, wherein PTFE gaskets are respectively arranged between the anode special-shaped current collector and the proton exchange membrane module, and between the cathode special-shaped current collector and the proton exchange membrane module. The sealing mode of the scheme has a defect that the PTFE or the silica gel can generate inert deformation under the condition of being subjected to gravity for a long time, and gradually lose elasticity, finally cause local air leakage, outward movement of material deformation, even rot and the like, and further lose the sealing effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a PEM electrolysis water hydrogen plant with seal structure, under the prerequisite of not destroying the sealing material structure, can effectively realize sealed, and can realize high strength material external seal and flexible material inner seal's self-adaptation high-pressure seal, simple process, the preparation is convenient, easily uses widely.

A PEM (proton exchange membrane) water electrolysis hydrogen production device with a sealing structure comprises an anode plate and a cathode plate, wherein the anode plate and the cathode plate are respectively provided with a central groove, the central grooves of the anode plate and the cathode plate are oppositely arranged, the central grooves of the anode plate and the cathode plate are respectively provided with uniformly distributed bulges to form a flow channel, the anode plate and the cathode plate are respectively provided with an anode current collector and a cathode current collector at the central grooves, and a proton exchange membrane is arranged between the anode current collector and the cathode current collector;

the sealing structure comprises annular grooves which are respectively arranged on the anode plate and the cathode plate and surround the central groove, and sealing parts which are attached to the proton exchange membrane are arranged in the annular grooves.

In this scheme, the runner is direct carves at the polar plate center, and the runner has designed the recess of sealing material outward, during the equipment, puts into the recess with flexible seal material to prevent the sealing member skew, such structural design, even very little fastening force can easily realize sealedly, the outside edge of sealing member is by the separation of polar plate material simultaneously, in order to realize that the banding is sealed.

Preferably, the edges of the respective central grooves of the anode plate and the cathode plate are provided with annular steps for limiting and fixing the anode current collector and the cathode current collector.

Preferably, the fuel cell further comprises end plates respectively arranged at the outer sides of the anode plate and the cathode plate, and the two end plates are locked through bolts so as to compress the anode plate, the anode current collector, the proton exchange membrane, the cathode current collector and the cathode plate which are sequentially arranged.

Preferably, the anode plate and the cathode plate are both graphite plates or titanium plates.

Preferably, the anode current collector and the cathode current collector are both titanium meshes or porous titanium plates.

Preferably, the sealing member is a silicone plate or a PTFE plate.

The utility model has the advantages that:

(1) the utility model discloses a seal structure does not need sealing material to warp by a wide margin, can not destroy the material structure.

(2) The utility model discloses a seal structure is suitable for most sealing materials, has broken the difficult dilemma of this research field sealing material lectotype.

(3) The sealing structure of the utility model is suitable for electrolytic stacks and electrolytic tanks of various specifications, and has small application limitation.

(4) The utility model discloses the design of polar plate structure, fine solution the lectotype cooperation problem of sealing material with the polar plate.

Drawings

FIG. 1 is a top view of an anode plate according to the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a top view of an anode plate, anode current collector, proton exchange membrane, cathode current collector, and cathode plate assembly;

fig. 4 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 3 and 4, a PEM electrolyzed water hydrogen production device with a sealed structure comprises an anode plate 1, an anode current collector 2, a proton exchange membrane 3, a cathode current collector 4 and a cathode plate 5 which are arranged in sequence.

The centers of the anode plate 1 and the cathode plate 5 are groove structures, the two center grooves are arranged oppositely, and the center grooves of the anode plate 1 and the cathode plate 5 are both provided with uniformly distributed bulges to form a flow channel 11. The anode current collector 2 and the cathode current collector 4 are respectively arranged at the central grooves of the anode plate 1 and the cathode plate 2, and the proton exchange membrane 3 is clamped between the anode current collector 2 and the cathode current collector 4.

As shown in fig. 1-4, the sealing structure of the PEM electrolyzed water hydrogen production device specifically comprises an annular groove 12 which is respectively arranged on the anode plate 1 and the cathode plate 5 and surrounds the central groove, a sealing element 6 is arranged in the annular groove 12, and when the sealing element 6 is clamped, the sealing element 6 is attached to the proton exchange membrane 3 to ensure the sealing effect.

In this embodiment, the edges of the central grooves of the anode plate 1 and the cathode plate 5 are provided with annular steps 13, and during assembly, the current collector is fixed on the annular steps 13 and plays a role in limiting.

The PEM water electrolysis hydrogen production device further comprises a clamping device, and specifically comprises end plates 7 which are respectively arranged on the outer sides of the anode plate 1 and the cathode plate 5, wherein the two end plates 7 are locked through bolts 8 so as to tightly press the anode plate 1, the anode current collector 2, the proton exchange membrane 3, the cathode current collector 4 and the cathode plate 5 which are sequentially arranged, so that the sealing element 6 is tightly attached to the proton exchange membrane 3 to ensure the sealing effect.

In this embodiment, the anode plate 1 and the cathode plate 5 are both titanium plates; the anode current collector 2 and the cathode current collector 4 are both titanium porous titanium plates; the seal 6 is a PTFE sheet.

The utility model discloses a runner 11 directly carves in the middle of the polar plate, and 11 top edge departments of runner have designed annular step 13, are convenient for place and fixed current collector, and 11 outer designs annular groove 12 of runner, and the depth of groove is decided by the thickness of sealing material. During assembly, the current collector is placed on the annular step 13 for fixing, the sealing member 6 is placed in the annular groove 12, the height of the sealing member 6 is slightly higher than that of the current collector, sealing is facilitated, and the size of the sealing member 6 is slightly smaller than that of the annular groove 12 so as to deal with offset caused by deformation of the sealing member 6 during assembly, fastening and extrusion. Due to the structural design, sealing can be easily realized even by small fastening force. The outer edge of the seal 6 is blocked by titanium plate material to achieve edge sealing.

In other alternative embodiments, the anode plate 1 and the cathode plate 5 are both graphite plates; the anode current collector 2 and the cathode current collector 4 are both titanium-titanium meshes; the sealing member 6 is a silicone plate.

The method for producing hydrogen by electrolyzing water comprises the following steps:

1. the pure water directly reaches the anode catalyst layer through the anode current collector to generate oxygen;

2. oxygen returns to the anode current collector and flows out of the water oxygen outlet together with the non-electrolyzed pure water;

3. the proton passes through the proton exchange membrane, is reduced into hydrogen under the action of the cathode catalyst layer, and is collected at the hydrogen outlet through the cathode current collector.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A PEM (proton exchange membrane) water electrolysis hydrogen production device with a sealing structure is characterized by comprising an anode plate and a cathode plate, wherein the anode plate and the cathode plate are respectively provided with a central groove, the central grooves of the anode plate and the cathode plate are oppositely arranged, the central grooves of the anode plate and the cathode plate are respectively provided with uniformly distributed bulges to form a flow channel, the anode plate and the cathode plate are respectively provided with an anode current collector and a cathode current collector at the central grooves, and a proton exchange membrane is arranged between the anode current collector and the cathode current collector;

2. The PEM electrolytic water hydrogen production device with sealing structure of claim 1, wherein the edges of the central grooves of the anode plate and the cathode plate are provided with annular steps for limiting and fixing the anode current collector and the cathode current collector.

3. The PEM electrolytic water hydrogen production device with seal structure of claim 1, further comprising end plates respectively disposed outside the anode plate and the cathode plate, wherein the two end plates are locked by bolts to compress the anode plate, the anode current collector, the proton exchange membrane, the cathode current collector and the cathode plate sequentially disposed.

4. The PEM electrolytic water hydrogen plant with a sealed structure of claim 1, wherein the anode plate and the cathode plate are both graphite plates or titanium plates.

5. The PEM electrolytic water hydrogen plant with a sealed structure of claim 1, wherein the anode current collector and the cathode current collector are both titanium meshes or porous titanium plates.

6. The PEM electrolytic water hydrogen plant with seal structure of claim 1, wherein the seal is a silica gel plate or a PTFE plate.