CN115548389A - Electrochemical hydrogen treatment system - Google Patents

Abstract

The invention provides an electrochemical hydrogen treatment system, and relates to the technical field of hydrogen transportation, purification and pressurization treatment in the hydrogen energy utilization technology. The purification units are arranged in parallel, and the purification inlets are independent of each other and simultaneously receive the hydrogen containing miscellaneous gases, so that the whole purification device can generate a large amount of purified hydrogen, is effectively suitable for occasions with high input hydrogen impurity content, and generates hydrogen with pressure and purity meeting use conditions. The method can also solve the problems of enrichment, separation, purification and pressurization in the process from low concentration to high purity when the hydrogen with small concentration is mixed in pipeline gas supply systems such as coal gas, natural gas and the like.

Description

Electrochemical hydrogen treatment system

Technical Field

The invention relates to the technical field of hydrogen transportation, purification and pressurization treatment in a hydrogen energy utilization technology, in particular to an electrochemical hydrogen treatment system.

Background

In recent years, various fuel cells using hydrogen as a fuel have been increasingly popularized and popularized. In the field of vehicle technology, in particular, the construction of various infrastructure associated with fuel cells has been proposed. The electrochemical hydrogen pressurizing pump is considered to be a feasible substitute of a compressor due to the advantages of high pressure-boosting efficiency, small volume and low noise. The hydrogen pressurizing pump is mainly used for inputting hydrogen with a certain pressure when in work and then pressurizing the hydrogen to a state meeting the use condition. The hydrogen pressurizing pump can realize separation, purification and pressurization of hydrogen, but the purification efficiency is low, and the hydrogen pressurizing pump is difficult to be directly applied to the environment with high impurity content of input hydrogen.

Disclosure of Invention

The present application provides an electrochemical hydrogen treatment system that can be adapted to situations where the input hydrogen gas has a high impurity content.

The present application provides an electrochemical hydrogen treatment system comprising:

a pressurizing device including a pressurizing unit including a first membrane electrode assembly for pressurizing hydrogen gas, the pressurizing unit having a pressurizing inlet and a pressurizing outlet formed thereon;

a purification apparatus including a plurality of purification units including a second membrane electrode assembly for purifying hydrogen gas, the purification units having a purification inlet and a purification outlet formed thereon, the plurality of purification units being arranged in parallel, and the purification inlet of each purification unit being configured to be capable of receiving hydrogen gas independently of each other;

wherein the purification outlet of each purification unit is communicated with the pressurizing inlet in the pressurizing device.

In some embodiments of the present application, the sum of the flow areas of the second membrane electrode assemblies is larger than the flow area of the first membrane electrode assembly.

In some embodiments of the present application, the sum of the flow areas of the second membrane electrode assemblies is in a proportional relationship with the flow area of the first membrane electrode assembly.

In some embodiments of the present application, the ratio of the sum of the flow areas of the second membrane electrode assemblies to the flow area of the first membrane electrode assembly is 2:1 to 35.

In some examples of the present application, the sum of the flow areas of the second membrane electrode assemblies was 2500cm ² And the second membrane electrode assembly has a flow area of 125cm ² 。

In some embodiments of the present application, the number of the pressurizing units is multiple, and the pressurizing units are sequentially connected in series; the pressurizing inlet in the pressurizing unit at the foremost side in the hydrogen gas conveying direction is used for communicating with the purification outlet of each of the purification units.

The pressurizing unit comprises an anode separator and a cathode separator, the anode separator and the cathode separator are respectively connected to two surfaces of the first membrane electrode assembly, the pressurizing inlet is arranged on the anode separator, and the pressurizing outlet is arranged on the cathode separator;

after the arrangement is adopted, the continuous and progressive pressurization operation of the existing hydrogen can be realized, so that the hydrogen pressure can meet the use conditions of hydrogen filling equipment in application scenes of fuel cell vehicles and the like.

In some embodiments of the present application, the first membrane electrode assembly includes a first anode diffusion layer, a first anode catalyst layer, a first proton exchange membrane, a first cathode catalyst layer, and a first cathode diffusion layer stacked in this order in the direction from the anode separator to the cathode separator.

In some embodiments of the present application, the second membrane electrode assembly includes:

a second proton exchange membrane, wherein the second proton exchange membrane is arranged on the first membrane,

the second anode catalyst layer and the second cathode catalyst layer are respectively connected to two sides of the second proton exchange membrane;

the second anode diffusion layer is connected with one surface, back to the second proton exchange membrane, of the second anode catalyst layer, and the second cathode diffusion layer is connected with one surface, back to the second proton exchange membrane, of the second cathode catalyst layer.

In some embodiments of the present application, the second anode diffusion layer partially defines an outer contour of the purification unit, so as to increase a contact area between the impurity-containing hydrogen and the second anode diffusion layer, thereby increasing a yield of the purified hydrogen.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

the electrochemical hydrogen treatment system provided by the invention is mainly used for pretreating hydrogen by a plurality of purification units arranged in parallel in the purification device. The purification units are arranged in parallel, and each purification inlet is independent of each other and simultaneously receives hydrogen with low concentration and impurity gas, so that the whole purification device can generate purified hydrogen with larger amount, thereby being effectively suitable for occasions with low concentration and high impurity content of input hydrogen and generating hydrogen with pressure and purity meeting use conditions.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of an electrochemical hydrogen processing system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a pressurization device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a pressing unit according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a first membrane electrode assembly provided in an embodiment of the invention;

fig. 5 is a schematic structural view of a second membrane electrode assembly provided in an embodiment of the invention.

Description of reference numerals:

100-pressurized cell, 110-first membrane electrode assembly, 111-first proton exchange membrane, 112-first anode layer, 113-first cathode layer, 114-first anode catalytic layer, 115-first anode diffusion layer, 116-first cathode catalytic layer, 117-first cathode diffusion layer, 120-anode separator, 121-pressurized inlet, 130-cathode separator, 131-pressurized outlet;

210-anode conducting plate, 220-anode insulating plate, 230-cathode conducting plate, 240-cathode insulating plate;

300-an insulator;

410-first end plate, 420-second end plate, 430-bolt, 440-nut;

600-purification unit, 610-second membrane electrode assembly, 621-second proton exchange membrane, 612-second anode layer, 613-second cathode layer, 614-second anode catalytic layer, 615-second anode diffusion layer, 616-second cathode catalytic layer, 617-second cathode diffusion layer.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or including indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Examples

Referring to fig. 1, the present embodiment provides an electrochemical hydrogen processing system, including:

a pressurizing device including a pressurizing unit 100, the pressurizing unit 100 including a first membrane electrode assembly 110 for pressurizing hydrogen gas, the pressurizing unit 100 having a pressurizing inlet 121 and a pressurizing outlet 131 formed thereon;

a purification apparatus including a plurality of purification units 600, the purification units 600 including a second membrane electrode assembly 610 for purifying hydrogen gas, the purification units 600 having a purification inlet and a purification outlet formed thereon, the plurality of purification units 600 being arranged in parallel, and the purification inlets of the purification units 600 being configured to be capable of receiving hydrogen gas independently of each other;

wherein the purification outlet of each of the purification units 600 communicates with the pressurizing inlet 121 in the pressurizing device.

The electrochemical hydrogen processing system provided in this embodiment is mainly used to pre-process hydrogen by a plurality of purification units 600 arranged in parallel in the purification apparatus. Since the plurality of purification units 600 are arranged in parallel and the purification inlets receive the hydrogen containing impurity gases independently, the entire purification apparatus can generate a large amount of purified hydrogen, and thus, the purification apparatus is effectively applicable to a case where the input hydrogen contains a high impurity gas.

After the purification treatment by the purification device, the pressurization device pressurizes the purified hydrogen gas. So as to pressurize the purified hydrogen gas to a state in accordance with the use condition.

Note that the first membrane electrode assembly 110 and the second membrane electrode assembly 610 described above are the same in principle with respect to the hydrogen gas treatment, and both can perform the purification and pressurization functions at the same time to some extent. And each purification unit 600 in the purification apparatus independently receives the hydrogen containing the impurity gas, compared with the technical scheme of only arranging a single purification unit 600, the purification apparatus with a plurality of purification units 600 can generate a larger amount of purified hydrogen, thereby providing a basis for the subsequent pressurization operation and being suitable for the environment with hydrogen content of only about three percent.

With respect to the above-described scheme, it can be understood that the amount of purified hydrogen gas generated in the purification unit 600 needs to be adapted to the processing capacity of the pressurizing device to avoid the situation where the hydrogen gas supply in the pressurizing device is insufficient or excessive.

In addition, it should be noted that the electrochemical hydrogen processing system shown in fig. 1 is only an illustration, and the implementation personnel can couple the purification device and the pressurization device into the same module, and directly communicate with each other, or configure the two modules as independent modules, and the purification device and the pressurization device communicate with each other through a hydrogen pipeline. The present disclosure is not particularly limited thereto.

Therefore, in the present embodiment, the sum of the flow areas of the second membrane electrode assemblies 610 is larger than the flow area of the first membrane electrode assembly 110. The flow area of the membrane electrode assembly determines the amount of hydrogen gas that can be handled, and the larger the flow area, the larger the amount of purified and pressurized hydrogen gas that can be generated by the membrane electrode assembly. And the separation and purification efficiency of the second membrane electrode assembly 610 tends to be low. Setting the flow area of the second membrane electrode assembly 610 to be larger than that of the first membrane electrode assembly 110 can ensure that the amount of hydrogen gas introduced into the pressurizing means satisfies the processing capability of the pressurizing means to some extent.

The sum of the flow areas of the second membrane electrode assemblies 610 and the flow area of the first membrane electrode assembly 110 may be arranged in a proportional relationship to further ensure that the amount of hydrogen gas introduced into the pressurizing device satisfies the processing capability of the pressurizing device. For example, the ratio of the sum of the flow areas of the second membrane electrode assemblies 610 to the flow area of the first membrane electrode assembly 110 may be set to 2:1 to 35 so that the amount of hydrogen gas generated by the purification device can satisfy the processing capacity of the pressurization device.

The implementing personnel can correspondingly adjust and optimize the proportional relation according to the self requirements. Specifically, the optimal proportional relationship can be obtained through experiments. Specifically, pressure sensors may be respectively provided on both sides of the first membrane electrode assembly 110 to detect a pressure difference between the low pressure side and the high pressure side of the first membrane electrode assembly 110. When the pressure difference is large, the sum of the flow areas of the second membrane electrode assemblies 610 is increased. When the pressure difference is small, the sum of the flow areas of the second membrane electrode assemblies 610 is reduced.

More specifically, in the present embodiment, the sum of the flow areas of the second membrane electrode assemblies 610 is 2500cm ² The first membrane electrode assembly 110 had a flow area of 125cm ² 。

The above flow area means an effective working area, i.e., an active area, through which hydrogen protons can pass in the membrane electrode assembly. .

On the other hand, the pressurizing unit 100 is mainly used for pressurizing the purified hydrogen gas, and referring to fig. 2, in the present embodiment, the pressurizing device is mainly formed by connecting a plurality of pressurizing units 100 having the same structure and principle. A plurality of the pressurizing units 100 are sequentially connected in series; the pressurizing inlet 121 in the pressurizing unit 100 at the foremost side in the hydrogen gas conveying direction is adapted to communicate with the purification outlet of each of the purification units 600. Referring to fig. 3, each pressurizing unit 100 includes a first membrane electrode assembly 110 formed by sequentially stacking and connecting a first anode layer 112, a first proton exchange membrane 111, and a first cathode layer 113, and is used for realizing continuous and progressive pressurizing operation of hydrogen so that the hydrogen pressure can meet the use conditions of hydrogen pressurizing equipment for fuel cell vehicles and the like.

In addition, referring to fig. 2 again, it can be seen that in the present embodiment, each of the pressing units 100 is sequentially stacked between the first end plate 410 and the second end plate 420, and the first end plate 410 and the second end plate 420 clamp and fasten the pressing units 100 through the bolts 430 and the nuts 440.

The fastening means may be configured in other manners, for example, in another embodiment, the fastening means includes an elastic member, and both ends of the elastic member are respectively connected to the first end plate 410 and the second end plate 420, so as to apply an elastic force to the first end plate 410 and the second end plate 420, wherein the elastic force is a force for moving the two plates toward each other, and the elastic force constitutes a fastening force. In the related embodiment, the elastic member is embodied as a tension spring, and both ends of the tension spring are respectively connected to the first end plate 410 and the second end plate 420 to apply an elastic force to the two so that the two have a tendency to move toward each other.

The principle of pressurization of the first membrane electrode assembly 110 will be briefly described below.

When the pressurizing unit 100 is used, a voltage is applied to the first anode layer 112 and the first cathode layer 113, and a low-pressure hydrogen gas is applied to the first anode layer 112 through the pressurizing inlet 121 of the anode separator 120. Then, as shown in formula (1), in the first anode layer 112, the low-pressure-side hydrogen molecules are dissociated into protons and electrons by the catalyst.

H ₂ (Low pressure) → 2H ⁺ +2e ^- (1)

The protons dissociated in the first anode layer 112 pass through the first proton exchange membrane 111 under the action of water molecules and finally reach the first cathode layer 113, and the protons react in the cathode layer under the action of a catalyst as shown in formula (2), i.e., electrons in the first cathode layer 113 and the protons passing through the first proton exchange membrane 111 undergo a reduction reaction, so as to obtain hydrogen gas which is enriched, separated, purified and pressurized, and the hydrogen gas is discharged from a pressurizing outlet 131 of the cathode separator 130.

2H ⁺ +2e ^- →H ₂ (high pressure) (2)

The second membrane electrode assembly 610 and the first membrane electrode assembly 110 are consistent in the principle of processing hydrogen, and both can simultaneously achieve the effects of purification and pressurization, and the difference between the two is that the introduced hydrogen has different impurity content and pressure, so the description is not repeated.

As for the specific structure of the pressurizing unit 100, please refer to that the pressurizing unit 100 includes an anode separator 120 and a cathode separator 130, the anode separator 120 and the cathode separator 130 are respectively connected to both sides of the first membrane-electrode assembly 110, the pressurizing inlet 121 is provided on the anode separator 120, and the pressurizing outlet 131 is provided on the cathode separator 130. More specifically, in the present embodiment, the anode separator 120 and the cathode separator 130 are provided with flow channels to facilitate the flow of the low-pressure hydrogen from the pressure inlet 121 to the first membrane electrode assembly 110 and to facilitate the flow of the high-pressure hydrogen from the first membrane electrode assembly 110 to the pressure outlet 131.

In addition, the anode separator 120 and the cathode separator 130 also form a part of a battery circuit, and specifically, the anode separator 120 is connected to the anode through an anode conductive plate 210, and the cathode separator 130 is connected to the cathode through a cathode conductive plate 230. The anode separator 120 and the first anode layer 112 are electrically conductive to each other, and the cathode separator 130 and the first cathode layer 113 are electrically conductive to each other, so that the anode separator 120 and the cathode separator 130 supply voltages to the first anode layer 112 and the first cathode layer 113, respectively. The anode separator plates 120 and the cathode separator plates 130 in the adjacent two-stage pressurizing units 100 are conductively connected to each other, so that the voltage can be simultaneously supplied to the first membrane-electrode assemblies 110 in the respective stages of pressurizing units 100 by providing only one pair of the anode conductive plates 210 and the cathode conductive plates 230 for the entire pressurizing device. Meanwhile, an anode insulating plate 220 is disposed between the anode conductive plate 210 and the first end plate 410, and a cathode insulating plate 240 is disposed between the cathode conductive plate 230 and the second end plate 420, for insulating the first end plate 410 and the second end plate 420. The conductive layer 210 and the conductive layer 230 are not provided, and the anode and cathode of the power supply are directly connected to the anode and cathode layers through the terminals.

Further, in order to prevent the anode separator 120 and the cathode separator 130 in the pressurizing unit 100 from being electrically conductive with each other, in the present embodiment, the pressurizing unit 100 further includes an insulator 300, the insulator 300 is provided between the anode separator 120 and the cathode separator 130, and the insulator 300 encloses a space for accommodating the first membrane electrode assembly 110 in cooperation with the anode separator 120 and the cathode separator 130. The insulator 300 is mainly used to insulate the anode separator 120 and the cathode separator 130, and is in the form of a ring, and the space in the inner hole forms a space for accommodating the first membrane electrode assembly 110. A sealing member such as an O-ring may be provided on the insulator 300 to ensure the airtightness of the space. With regard to the material of the insulator 300, practitioners can select from the prior art insulators 300 that have satisfactory mechanical properties and good insulating properties, such as PEN and PET insulators.

Referring to fig. 4, a schematic structural view of the first membrane electrode assembly 110 used in the present embodiment is shown for a specific structure of the first membrane electrode assembly 110. In the present embodiment, the first membrane electrode assembly 110 includes a first anode diffusion layer 115, a first anode catalytic layer 114, a first proton exchange membrane 111, a first cathode catalytic layer 116, and a first cathode diffusion layer 117 stacked in this order in the direction from the anode separator 120 to the cathode separator 130;

wherein the first anode diffusion layer 115 is connected to the anode separator 120 so that the pressurizing inlet 121 and the first anode diffusion layer 115 communicate with each other, and the first cathode diffusion layer 117 is connected to the cathode separator 130 so that the pressurizing outlet 131 and the first cathode diffusion layer 117 communicate with each other.

The first anode diffusion layer 115 and the first anode catalyst layer 114 constitute the first anode layer 112, and the first cathode catalyst layer 116 and the first cathode diffusion layer 117 constitute the first cathode layer 113.

In the present embodiment, the first proton exchange membrane 111 is mainly used for proton transfer, and may be a fluorine polymer electrolyte membrane or a hydrocarbon polymer electrolyte membrane, which is not limited in the disclosure. The first anode diffusion layer 115 and the first cathode diffusion layer 117 mainly allow hydrogen to diffuse and flow therethrough and perform the functions of electrical conduction and mechanical support. In the present embodiment, the first anode diffusion layer 115 is mainly composed of a sintered titanium powder. The practitioner may also use a metal fiber sintered body made of titanium, a titanium alloy, stainless steel, or the like as a base material of the first anode diffusion layer 115. In the present embodiment, the first cathode layer 113 is made of a carbon fiber layer. The titanium powder sintered body is used as the first anode diffusion layer 115, the carbon fiber body 117 is used as the first cathode diffusion layer 117, the electrical and thermal conductivity of the membrane electrode combination body can be effectively guaranteed, the volume specific power and the mass specific power of the whole pressurizing unit are improved, and implementers can select the first anode diffusion layer 115 and the first cathode diffusion layer 117 made of other materials to guarantee the mechanical property and the electrical and thermal conductivity of the whole pressurizing unit.

Meanwhile, the first anode catalytic layer 114 and the first cathode catalytic layer 116 mainly perform a catalytic function. In the present embodiment, the first anode catalyst layer 114 and the first cathode catalyst layer 116 contain platinum for catalysis, but the present invention is not limited thereto. It should be noted that, the person skilled in the art has the ability to select a suitable catalytic layer structure and a preparation method thereof from the prior art, and the disclosure is not limited thereto. For example, carbon-based powder or compound powder having conductivity can be used as a carrier of the catalyst. As the carbon-based powder, a powder of graphite, carbon black, activated carbon having conductivity, or the like can be used. As a method for carrying the platinum catalyst or the other metal catalyst on the carrier, a method using mutual mixing of powders or liquid phase mixing may be employed.

Referring to fig. 5, with respect to the second membrane electrode assembly 610, in the present embodiment, the second membrane electrode assembly 610 includes:

a second proton exchange membrane 621;

a second anode catalytic layer 614 and a second cathode catalytic layer 616, wherein the second anode catalytic layer 614 and the second cathode catalytic layer 616 are respectively connected on two sides of the second proton exchange membrane 621; the second anode catalytic layer 614 and the second cathode catalytic layer 616 have the material characteristics of low cost and impurity gas resistance, so that catalyst poisoning is avoided, and the durability of the electrochemical hydrogen pump is improved;

a second anode diffusion layer 615 and a second cathode diffusion layer 617, wherein the second anode diffusion layer 615 is connected to a side of the second anode catalytic layer 614 facing away from the second proton exchange membrane 621, and the second cathode diffusion layer 617 is connected to a side of the second cathode catalytic layer 616 facing away from the second proton exchange membrane 621.

The second anode catalyst layer 614 and the second anode diffusion layer 615 constitute the second anode layer 612, and the second cathode catalyst layer 616 and the second cathode diffusion layer 617 constitute the second cathode layer 613.

The specific material composition of the second membrane electrode assembly 610 may be selected to be the same as or different from that of the first membrane electrode assembly 110. For example, in the present embodiment, the second membrane electrode 610 and the first membrane electrode assembly 110 described above are configured to have the same configuration.

In addition, in the present embodiment, the second anode diffusion layer 615 partially defines an outer contour of the purification unit 600, so that the second anode diffusion layer 615 directly constitutes the purification inlet. That is, in the present embodiment, the second anode diffusion layer 615 is configured in an open pattern, such that the efficiency of the hydrogen gas containing the impurity gas entering into the second anode diffusion layer 615 can be improved, the second anode diffusion layers 615 in the respective purification units 600 receive the hydrogen gas containing the impurity gas independently of each other, and the purification efficiency of the entire purification apparatus can be improved.

In the present embodiment, the purification units 600 are sequentially stacked, and the side of the second anode diffusion layer 615 is open, so that it directly receives hydrogen gas containing a foreign gas from the outside. It should be noted that different types of bipolar plates can be used for the purification unit 600 and the pressurization unit 100, and the corresponding diffusion layer, the flow channel layer of the bipolar plate, and the sealing ring in each unit cooperate to form a passage for conducting hydrogen. The form of the flow channel includes but is not limited to: open anode (cathode) type, 3D variable cross-section flow field, wave type, snake type, etc.

Further, in the above electrochemical hydrogen processing system, the pressurizing outlet of the last pressurizing unit 100 in the pressurizing means in the hydrogen gas transporting direction may be directly connected to a storage means such as a hydrogen gas storage tank to directly store hydrogen gas in accordance with the use condition.

More specifically, in the embodiment, the number of the purification units 600 is 4, and the purification units are disposed in the purification apparatus, so that an implementer can correspondingly adjust the number of the purification units 600 in the purification apparatus according to his own needs, which is not limited by the disclosure.

The electrochemical hydrogen processing system provided by the embodiment comprises a purification device with a plurality of purification units 600 arranged in parallel and a pressurizing device with a plurality of pressurizing units 100 arranged in series, and further realizes continuous pressurization of low-pressure hydrogen on the basis of realizing separation and purification of impurity-containing hydrogen, thereby obtaining hydrogen capable of meeting the use condition of hydrogen fuel cell vehicle pressurizing equipment. Taking this embodiment as an example, the application scenarios of this embodiment are: small or micro-concentration hydrogen (< 20%) is mixed in gas, natural gas and other pipeline gas supply systems. The system provided by the embodiment realizes enrichment, separation, purification and pressurization of hydrogen from low purity to high purity (99.999%).

Meanwhile, in this embodiment, the shape of the second anode diffusion layer 615 in the purification apparatus is optimized and improved, and the second anode diffusion layer 615 is in an open shape, so that the contact area between the second anode diffusion layer 615 and hydrogen is increased, and the amount of purified hydrogen gas generated by the whole apparatus is increased finally.

The electrochemical hydrogen treatment system provided in the embodiments of the present application is described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, which are only used to help understand the method and the core concept of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. An electrochemical hydrogen processing system, comprising:

a pressurizing device including a pressurizing unit including a first membrane electrode assembly for pressurizing hydrogen gas, the pressurizing unit having a pressurizing inlet and a pressurizing outlet formed thereon;

a purification apparatus including a plurality of purification units including a second membrane electrode assembly for purifying hydrogen gas, the purification units having a purification inlet and a purification outlet formed thereon, the plurality of purification units being arranged in parallel, and the purification inlet of each purification unit being configured to be capable of receiving hydrogen gas independently of each other;

wherein the purification outlet of each purification unit is communicated with the pressurizing inlet in the pressurizing device.

2. The electrochemical hydrogen gas treatment system according to claim 1, wherein the sum of the flow areas of the second membrane electrode assemblies is larger than the flow area of the first membrane electrode assembly.

3. The electrochemical hydrogen gas processing system according to claim 2, wherein the sum of the flow areas of the second membrane electrode assemblies is proportional to the flow area of the first membrane electrode assembly.

4. The electrochemical hydrogen gas processing system according to claim 3, wherein the ratio of the sum of the flow areas of the second membrane electrode assemblies to the flow area of the first membrane electrode assembly is 2:1 to 35.

5. The electrochemical hydrogen gas processing system according to claim 1, wherein the sum of the flow area of each of the second membrane electrode assemblies is 2500cm ² The first membrane electrode assembly has a flow area of 125cm ² 。

6. The electrochemical hydrogen gas treatment system according to claim 1, wherein the pressurizing units are plural in number, and plural pressurizing units are connected in series in this order; the pressurizing inlet in the pressurizing unit at the foremost side in the hydrogen gas conveying direction is used for communicating with the purification outlet of each of the purification units.

7. The electrochemical hydrogen processing system according to claim 1, wherein the pressurizing unit comprises an anode separator and a cathode separator, the anode separator and the cathode separator being attached to both surfaces of the first membrane-electrode assembly, respectively, the pressurizing inlet being provided in the anode separator, and the pressurizing outlet being provided in the cathode separator.

8. The electrochemical hydrogen gas treatment system according to claim 7, wherein the first membrane-electrode assembly comprises a first anode diffusion layer, a first anode catalyst layer, a first proton exchange membrane, a first cathode catalyst layer, and a first cathode diffusion layer, which are stacked in this order in a direction from the anode separator to the cathode separator.

9. The electrochemical hydrogen gas treatment system according to claim 1, wherein the second membrane electrode assembly comprises:

a second proton exchange membrane;

the second anode catalyst layer and the second cathode catalyst layer are respectively connected to two sides of the second proton exchange membrane;

the second anode diffusion layer is connected with one surface, back to the second proton exchange membrane, of the second anode catalyst layer, and the second cathode diffusion layer is connected with one surface, back to the second proton exchange membrane, of the second cathode catalyst layer.

10. The electrochemical hydrogen processing system of claim 9 wherein the second anode diffusion layer partially defines an outer contour of the purification unit.

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