Fuel cell pulping system and method

Abstract

The invention discloses a pulping system for a fuel cell. The pulping system comprises a catalyst dry powder premixing unit, a liquid feeding premixing unit connected with the catalyst dry powder premixing unit, a continuous circulating dispersion pulping unit connected with the liquid feeding premixing unit, and a coating unit connected with the liquid feeding premixing unit and used for coating. According to the fuel cell pulping system, accurate, rapid and automatic feeding and slurry dispersion can be achieved, the fuel cell pulping speed is increased, and the utilization rate of materials can be increased. The invention also discloses a fuel cell pulping method.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell technology. Specifically, this invention relates to a fuel cell slurry preparation system and method. Background Technology

[0002] As the core component of hydrogen fuel cell reactions, the membrane electrode assembly (MEA) of a fuel cell mainly consists of core processes such as catalyst slurry preparation, catalyst layer coating and molding, CCM molding, and GDL encapsulation. Among these, catalyst slurry preparation, as the first and most critical step in MEA fabrication, determines not only the quality of subsequent coating but also the performance and durability of the resulting MEA. Therefore, optimizing the formulation and preparation process of the fuel cell slurry is a crucial aspect of current MEA iterative optimization.

[0003] Typically, fuel cell slurry preparation involves mixing and dispersing Pt / C catalyst, ionomer solution, alcohol solvent, and ultrapure water in a specific ratio and sequence. However, due to the characteristics of Pt / C catalysts, such as easy combustion, easy agglomeration and sedimentation, easy catalytic oxidation and deterioration with alcohols, easy wall scraping residue, and high cost, current slurry preparation methods often employ manual weighing and feeding, and a "one-time preparation and use" approach. This results in low slurry preparation efficiency and high catalyst waste, failing to meet the needs for rapid iterative optimization of slurry preparation and improved catalyst utilization.

[0004] The aim is to provide an improved fuel cell slurry preparation system, particularly regarding how to increase the slurry preparation rate and improve catalyst utilization. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a fuel cell slurry preparation system, the purpose of which is to improve the slurry preparation speed of fuel cells.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a fuel cell slurry preparation system, including a catalyst dry powder premixing unit, a liquid feeding premixing unit connected to the catalyst dry powder premixing unit, a continuous circulation dispersion slurry preparation unit connected to the liquid feeding premixing unit, and a coating unit connected to the liquid feeding premixing unit and used for coating.

[0007] The catalyst dry powder premixing unit is configured to mix the catalyst and ultrapure water to form a premix.

[0008] The liquid feeding premixing unit is configured to mix premixed materials with various liquid materials to form a mixture;

[0009] The continuous circulating dispersion pulping unit is configured to perform secondary dispersion of the mixture from the liquid feed premixing unit, form a slurry through circulating pulping, and enable the slurry to be returned to the liquid feed premixing unit.

[0010] The catalyst dry powder premixing unit includes a premixing tank and a first ultrapure water tank connected to the premixing tank. The premixing tank is set on a first balance. A first main dispersion device and a first auxiliary dispersion device are set on the premixing tank. The catalyst is fed into the premixing tank through the catalyst feeding port.

[0011] The first primary dispersing device is a high-speed shear disperser or a planetary mixer, and the first auxiliary dispersing device is a high-shear homogenizer or an ultrasonic disperser.

[0012] The liquid feeding premixing unit includes a dispersion storage tank, a second peristaltic pump, a second ultrapure water tank, and multiple material tanks. The second ultrapure water tank and multiple material tanks are connected to the inlet end of the second peristaltic pump, and the outlet end of the second peristaltic pump is connected to the dispersion storage tank. A second main dispersion device and a second auxiliary dispersion device are installed on the dispersion storage tank.

[0013] The distributed storage tanks are located on the second day of the month.

[0014] The second main dispersing device is a high-speed shear disperser or a planetary mixer, and the second auxiliary dispersing device is a high-shear homogenizer or an ultrasonic disperser.

[0015] The continuous circulating dispersion pulping unit includes a first diaphragm pump and a circulating dispersion pulping equipment. The inlet end of the first diaphragm pump is connected to the dispersion storage tank, and the outlet end of the first diaphragm pump is connected to the circulating dispersion pulping equipment.

[0016] The circulating dispersion slurry preparation equipment is a high-shear homogenizer or a sand mill.

[0017] The coating unit is connected to the dispersion storage tank via a second diaphragm pump, and the coating unit and the second diaphragm pump are connected to the waste liquid recovery tank.

[0018] The present invention also provides a fuel cell slurry preparation method, employing the aforementioned fuel cell slurry preparation system, and comprising the following steps:

[0019] S1. The catalyst dry powder premixing unit mixes the catalyst and ultrapure water to form a premix.

[0020] S2. The liquid feeding premixing unit mixes the premixed material and various liquid materials to form a mixture;

[0021] S3. The continuous circulating dispersion pulping unit disperses the mixture from the liquid feeding premixing unit in a secondary manner and forms a slurry through circulating pulping.

[0022] S4. The slurry enters the coating unit for coating.

[0023] The fuel cell slurry preparation system of the present invention has the following beneficial effects:

[0024] 1. By premixing the catalyst with water, the traditional solid feed of catalyst powder is changed to liquid feed; with the help of a multi-channel intelligent peristaltic pump, the fine and automated feeding of each component in the slurry is achieved, which enables rapid adjustment of the slurry ratio and improves the utilization rate of materials;

[0025] 2. By adopting a sealed circulating pulping and dispersion system, the filling ratio and pulping efficiency of the pulp dispersion unit are improved;

[0026] 3. It has automated waste liquid recycling and pipeline rapid cleaning functions, enabling rapid slurry switching. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the fuel cell slurry preparation system of the present invention;

[0028] Figure 2 This is a schematic diagram of the second peristaltic pump;

[0029] The markings in the above figures are as follows: 1. Catalyst dry powder premixing unit; 2. Liquid feeding premixing unit; 3. Continuous circulating dispersion and slurry preparation unit; 4. Coating unit and waste recovery unit; 5. First balance; 6. Premixing tank; 7. Catalyst feeding port; 8. First ultrapure water tank; 9. First peristaltic pump; 10. First main dispersion equipment; 11. First auxiliary dispersion equipment; 12. First discharge valve; 13. Second ultrapure water tank; 14. Alcohol solvent tank; 15. Ionomer solution tank; 16. Second peristaltic pump; 17. Second balance; 18. Second main dispersion equipment; 19. Second auxiliary dispersion equipment; 20. Dispersion storage tank; 21a. Second discharge valve; 21b. Third discharge valve; 22. First diaphragm pump; 23. Circulating dispersion and slurry preparation equipment; 24. Coating unit; 25. Second diaphragm pump; 26a. First solenoid valve; 26b. Second solenoid valve; 27. Waste liquid recovery tank. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," and similar expressions used in this document are for illustrative purposes only.

[0032] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Firstly, such as Figure 1 As shown, an embodiment of the present invention provides a fuel cell slurry preparation system, including a catalyst dry powder premixing unit, a liquid feeding premixing unit connected to the catalyst dry powder premixing unit, a continuous circulation dispersion slurry preparation unit connected to the liquid feeding premixing unit, and a coating unit 24 connected to the liquid feeding premixing unit and used for coating.

[0035] Specifically, such as Figure 1 As shown in this embodiment of the invention, the catalyst can be fed in liquid form after the Pt / C catalyst and ultrapure water are premixed into a premixed solution with a certain solid content. Furthermore, the precise control of the amount of water, alcohol, ionomer solution, and premixed solution added to the slurry is achieved by using an intelligent peristaltic pump to precisely control the pumping speed and time, thus realizing slurry ratio regulation. After the materials in the slurry are fed, the slurry preparation is completed in the dispersion storage tank 20 and the circulating dispersion slurry preparation system, and then pumped into the coating unit 24 for coating. After coating, a certain proportion of water-alcohol solution is pumped in to clean the pipelines and dispersion equipment, and the residual waste liquid in the pipelines is collected. After cleaning, the slurry can be prepared and coated again.

[0036] like Figure 1As shown, the catalyst dry powder premixing unit is configured to mix the catalyst and ultrapure water to form a premix. The liquid feed premixing unit is configured to mix the premix with various liquid materials to form a mixture. The continuous circulating dispersion slurrying unit is configured to perform secondary dispersion of the mixture from the liquid feed premixing unit, form a slurry through circulating slurrying, and enable the slurry to be returned to the liquid feed premixing unit.

[0037] like Figure 1 As shown, the catalyst dry powder premixing unit includes a premixing tank 6 and a first ultrapure water tank 8 connected to the premixing tank 6. The premixing tank 6 is set on the first flat surface 5. The premixing tank 6 is equipped with a first main dispersion device 10 and a first auxiliary dispersion device 11. The catalyst is fed into the premixing tank 6 through the catalyst feeding port 7.

[0038] In this embodiment of the invention, the first balance 5 is a precision analytical balance, and the premixing tank 6 is placed on the precision analytical balance. After the material is put into the premixing tank 6, its weight can be measured by the first balance 5. Furthermore, a first main dispersion unit and a first auxiliary dispersion unit are installed above the premixing tank 6, which can mix the substances in the premixing tank 6. A first discharge valve 12 is located below the premixing tank 6. After the material is fully premixed, the first discharge valve 12 can be opened, and the premixed material in the premixing tank 6 enters the next unit.

[0039] In embodiments of the present invention, such as Figure 1 As shown, one side of the premix tank 6 is connected to the catalyst feeding port 7, so that the catalyst can directly enter the premix tank 6 through the feeding port, and the weight of the catalyst added into the premix tank 6 can be measured by a precision analytical balance.

[0040] The other side of the premixing tank 6 is connected to the ultrapure water supply system. The ultrapure water supply system includes a first peristaltic pump 9 and a first ultrapure water tank 8. The first ultrapure water tank 8 is a deionization storage tank. The inlet of the first peristaltic pump 9 is connected to the first ultrapure water tank 8, and the outlet of the first peristaltic pump 9 is connected to the premixing tank 6. By controlling the pumping speed and time of the first peristaltic pump 9, the volume of ultrapure water added to the premixing tank 6 can be precisely controlled. Since the density of ultrapure water is known, its weight can be calculated from its volume. Furthermore, the solid content of the catalyst in the premixed solution in the mixing tank can be accurately calculated using a precision analytical balance.

[0041] Preferably, the first primary dispersion unit 10 can be a high-shear mechanical mixer to strongly shear and disperse the material. The primary dispersion unit 10 can be a high-speed shear disperser or a planetary mixer, suitable for rapid mixing and dispersion of large-volume slurries. The first auxiliary dispersion unit 11 is a high-shear homogenizer or an ultrasonic disperser, which can further disperse the slurry in the laminar flow zone on the surface of the slurry. The combination of these two dispersion units helps promote the interaction and mixing between materials, significantly improving premixing efficiency. By setting up the first primary dispersion unit and the first auxiliary dispersion unit, the material in the premixing tank 6 is rapidly dispersed, achieving rapid and efficient dispersion. This ensures that the catalyst in the premixing tank 6 is fully wetted, guaranteeing adequate wetting of the catalyst in the liquid. This helps improve the catalyst's activity utilization rate, promotes chemical reactions, and significantly improves the dispersion efficiency of the material, thereby improving production efficiency and slurry quality. Then, the discharge valve can be opened to proceed to the next mixing step.

[0042] Preferably, the premix tank 6 has a heating and drying function. After the premixed material in the premix tank 6 is discharged, the premix tank 6 can be heated to remove the moisture in the premix tank 6 and recover the unused catalyst for reuse.

[0043] The heating and drying function of premix tank 6 is typically achieved through built-in heating elements (such as heating rods, heating coils, etc.) or an external heat source. After the premixed material in premix tank 6 has been discharged, the inlet and outlet valves related to the material are closed, and the heating system is started to heat the interior of premix tank 6. During the heating and drying process, as the moisture evaporates, the unused catalyst will gradually become visible.

[0044] Furthermore, after the catalyst and ultrapure water are premixed, the first discharge valve 12 can be opened to transfer the premix to the next process. Once the catalyst slurry is prepared, any excess premix can be stored in the premix tank 6 for future use.

[0045] Unlike batch-prepared fuel cell slurries, the premix tank 6 does not contain alcohols, preventing catalyst deterioration and allowing for long-term storage. Furthermore, water can be removed from the catalyst through heating and drying to obtain solid catalyst powder. This significantly reduces catalyst slurry waste.

[0046] like Figure 1As shown, the liquid feeding premixing unit includes a dispersion storage tank 20, a second peristaltic pump 16, a second ultrapure water tank 13, and multiple material tanks. The premixing tank 6, the second ultrapure water tank 13, and the multiple material tanks are connected to the inlet end of the second peristaltic pump 16, and the outlet end of the second peristaltic pump 16 is connected to the dispersion storage tank 20. A second main dispersion device 18 and a second auxiliary dispersion device 19 are installed on the dispersion storage tank 20. The dispersion storage tank 20 is mounted on a second balance 17, which is a precision analytical balance. The precision analytical balance allows for real-time verification of the materials fed into the dispersion storage tank 20, thereby achieving rapid and accurate feeding.

[0047] Preferably, the dispersion storage tank 20 has heat preservation and vacuum degassing functions, which can remove air bubbles in the slurry in a timely manner.

[0048] The dispersion equipment installed on the dispersion storage tank 20 can achieve preliminary and sufficient dispersion of each added liquid. Preferably, the second main dispersion equipment 18 can be a high-shear mechanical agitator, which exerts strong shearing and dispersion action on the material. The second main dispersion equipment 18 can be a high-speed shear disperser or a planetary mixer, which can adapt to the rapid mixing and dispersion of large-volume slurries. The second auxiliary dispersion equipment 19 is a high-shear homogenizer or an ultrasonic disperser, which can further disperse the slurry in the laminar flow zone on the surface of the slurry. The combination of the two dispersion equipment helps to promote the interaction and mixing between materials, which can greatly improve the premixing efficiency. By setting up the second main dispersion unit and the second auxiliary dispersion unit, the material in the dispersion storage tank 20 is rapidly dispersed, realizing rapid and efficient dispersion processing of the material in the dispersion storage tank 20, thereby improving production efficiency and slurry quality.

[0049] In this embodiment of the invention, the second peristaltic pump 16 is a multi-channel intelligent peristaltic pump, capable of precise feeding of liquid materials through multiple channels. Its key feature is a programmable intelligent distribution system that precisely controls and distributes materials in each channel, meeting the needs of simultaneous or sequential feeding. This allows for automated feeding of all materials required for fuel cell slurry formulation. Multiple material tanks connected to the inlet of the second peristaltic pump 16 include, but are not limited to, an alcohol solvent tank 14 and an ionomer solution tank 15, which can be added according to formulation requirements. The ionomer solution tank 15 is used to store the ionomer solution, and the alcohol solvent stored in the alcohol storage tank can be ethanol, ethylene glycol, n-propanol, or isopropanol, etc.

[0050] like Figure 1As shown, by calculating the slurry ratio and the total amount of slurry required, the amount of premixed liquid to be added, as well as the amounts of alcohol solvent, ultrapure water, and ionomer solution, are obtained. The first discharge valve 12 of the premix tank 6 is opened, and the pump speed and time are controlled by the second peristaltic pump 16 to automatically add the materials from the connected second ultrapure water tank 13, alcohol solvent tank 14, and ionomer solution tank 15 into the dispersion storage tank 20 for dispersion.

[0051] Furthermore, the slurry is dispersed by the second main dispersion device 18 and the second auxiliary dispersion device 19 above the bulk storage tank, thus completing the premixing of the slurry.

[0052] like Figure 1 As shown, the continuous circulating dispersion pulping unit includes a first diaphragm pump 22 and a circulating dispersion pulping device 23. The inlet end of the first diaphragm pump 22 is connected to the dispersion storage tank 20, and the outlet end of the first diaphragm pump 22 is connected to the circulating dispersion pulping device 23.

[0053] like Figure 1 As shown, the dispersion storage tank 20 is equipped with two outlets, with a second discharge valve 21a and a third discharge valve 21b respectively. After the materials in the dispersion storage tank 20 are mixed, the second discharge valve 21a is opened, and the mixture in the dispersion storage tank 20 is pumped into the circulating dispersion slurry preparation equipment 23 by the first diaphragm pump 22. The circulating dispersion slurry preparation equipment 23 performs secondary fine dispersion of the mixture, and then the dispersed mixture in the circulating dispersion slurry preparation equipment 23 is introduced into the dispersion storage tank 20. This process is one cycle; multiple cycles are performed continuously to form the final required slurry.

[0054] Furthermore, the circulating dispersion slurry preparation equipment 23 can employ a high-shear homogenizer with a high filling ratio and high dispersion efficiency, or a sand mill, for secondary fine dispersion of the slurry. This dispersion equipment ensures that the particle size and viscosity of the slurry meet the coating requirements.

[0055] In this embodiment of the invention, compared with single-batch dispersion, continuous dispersion transforms the dispersion of large-capacity slurry into multiple small-volume cyclic dispersion, resulting in higher dispersion efficiency, more thorough dispersion of each component, and a significant reduction in the amount of slurry residue adhering to the wall, thereby improving the utilization rate of the catalyst slurry.

[0056] like Figure 1As shown, the coating unit 24 is connected to the dispersion storage tank 20 via a second diaphragm pump 25. The inlet end of the second diaphragm pump 25 is connected to the dispersion storage tank 20, and the outlet end of the second diaphragm pump 25 is connected to the coating unit 24. After the slurry dispersion is completed, the second discharge valve 21a is closed and the third discharge valve 21b is opened. The second diaphragm pump 25 can then pump the dispersed slurry in the dispersion storage tank 20 into the coating unit 24 for coating to obtain a catalyst coating.

[0057] like Figure 1 As shown, preferably, the outlet end of the coating unit 24 and the outlet end of the second diaphragm pump 25 are also connected to the waste liquid recovery tank 27. A first solenoid valve 26a is installed in the pipeline connecting the outlet end of the coating unit 24 and the waste liquid recovery tank 27, and a second solenoid valve 26b is installed in the pipeline connecting the outlet end of the second diaphragm pump 25 and the waste liquid recovery tank 27. The first solenoid valve 26a and the second solenoid valve 26b are used to control the on / off state of their respective pipelines.

[0058] After coating is completed, close the first discharge valve 12, and open the second discharge valve 21a, the third discharge valve 21b, the first solenoid valve 26a, and the second solenoid valve 26b. Using the second peristaltic pump 16, ultrapure water and alcohol solvent are added in a specific ratio to the pipelines, dispersion storage tank 20, and coating unit 24 to clean the pipelines. The slurry in the pipelines and containers is then recovered to the waste liquid recovery tank 27. At this point, the secondary slurry preparation can begin.

[0059] With this setup, when preparing multiple batches of slurry, if the types of catalyst and ionomer remain unchanged, a solid mixture of catalyst and ionomer can be obtained by drying the substances in the waste liquid. Further analysis using thermogravimetric analysis (TGA) or X-ray fluorescence spectroscopy (XRF) to determine the ratio of ionomer to resin allows the solid mixture in the waste liquid to be recycled for the re-preparation of membrane electrodes, thus reducing catalyst waste.

[0060] This system enables rapid control of the dispersion process, water-to-alcohol ratio, solid content, and ionomer type of fuel cell slurry, while keeping the catalyst and ionomer types constant, thereby achieving rapid slurry shaping corresponding to the catalyst.

[0061] The fuel cell slurry preparation system described above has the following advantages:

[0062] 1. By premixing the catalyst with water, the traditional solid feed of catalyst powder is changed to liquid feed; with the help of a multi-channel intelligent peristaltic pump, the fine and automated feeding of each component in the slurry is achieved, which enables rapid adjustment of the slurry ratio and improves the utilization rate of materials;

[0063] 2. By adopting a sealed circulating pulping and dispersion system, the filling ratio of the pulp dispersion unit is increased, thereby improving dispersion efficiency and pulping efficiency;

[0064] 3. It has automated waste liquid recycling and pipeline rapid cleaning functions, enabling rapid slurry switching, recovery of high-value solid substances in the slurry, and improvement of material utilization.

[0065] The present invention also provides a fuel cell slurry preparation method, employing a fuel cell slurry preparation system with the above-described structure, and comprising the following steps:

[0066] S1, the catalyst dry powder premixing unit mixes the catalyst and ultrapure water to form a premix;

[0067] S2, the liquid feeding premixing unit mixes premixed materials and various liquid materials to form a mixture;

[0068] S3, the continuous circulating dispersion pulping unit disperses the mixture from the liquid feeding premixing unit in a secondary manner and forms a pulp through circulating pulping;

[0069] S4. The slurry enters the coating unit 24 for coating.

[0070] In step S1 above, the premix tank 6 has a heating and drying function. After the premixed material in the premix tank 6 is discharged, the water in the premix tank 6 can be removed by heating the premix tank 6, and the unused catalyst can be recovered for reuse.

[0071] In step S2 above, various liquid materials, including alcohol solvents and ionomers, can be added according to formulation requirements. The alcohol solvent can be ethanol, ethylene glycol, n-propanol, or isopropanol, etc.

[0072] Step S3 above includes:

[0073] S301, The mixture in the dispersion storage tank 20 enters the circulating dispersion slurry preparation equipment 23;

[0074] S302, The mixture is finely dispersed a second time by the circulating dispersion slurry preparation equipment 23;

[0075] S303. The mixture dispersed in the circulating dispersion slurry preparation equipment 23 is fed into the dispersion storage tank 20;

[0076] S304. Repeat steps S301 to S303 multiple times;

[0077] S305. The final required slurry is formed and enters the dispersion storage tank 20.

[0078] In step S3 above, by continuously performing multiple cycles, the dispersion of large-volume slurry is transformed into small-volume multiple-cycle dispersion, resulting in higher dispersion efficiency, more thorough dispersion of each component, and a significant reduction in the amount of slurry residue adhering to the wall, thereby improving the utilization rate of the catalyst slurry.

[0079] In step S4 above, after the slurry is dispersed, the second discharge valve 21a is closed and the third discharge valve 21b is opened. The second diaphragm pump 25 can then pump the dispersed slurry in the dispersion storage tank 20 into the coating unit 24, where the coating unit 24 coats the base membrane of the proton exchange membrane to obtain the catalyst coating.

[0080] The fuel cell slurry preparation method of the present invention further includes the following steps:

[0081] S5. Recycle waste liquid.

[0082] In step S5 above, after coating is completed, the first discharge valve 12 is closed, and the second discharge valve 21a, the third discharge valve 21b, the first solenoid valve 26a, and the second solenoid valve 26b are opened. The second peristaltic pump 16 is operated to inject cleaning agent into the pipeline, the dispersion storage tank 20, and the coating unit 24 to clean the pipeline and to recover the slurry in the pipeline, the dispersion storage tank 20, and the coating unit 24 into the waste liquid recovery tank 27.

[0083] In step S5 above, the cleaning agent is a mixture of ultrapure water and alcohol solvent in a certain proportion.

[0084] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A fuel cell slurry preparation system, characterized in that, It includes a catalyst dry powder premixing unit, a liquid feeding premixing unit connected to the catalyst dry powder premixing unit, a continuous circulating dispersion slurry preparation unit connected to the liquid feeding premixing unit, and a coating unit connected to the liquid feeding premixing unit and used for coating. The catalyst dry powder premixing unit is configured to mix the catalyst and ultrapure water to form a premix. The liquid feeding premixing unit is configured to mix premixed materials with various liquid materials to form a mixture; The continuous circulating dispersion pulping unit is configured to perform secondary dispersion of the mixture from the liquid feed premixing unit, form a slurry through circulating pulping, and enable the slurry to be returned to the liquid feed premixing unit.

2. The fuel cell slurry preparation system according to claim 1, characterized in that, The catalyst dry powder premixing unit includes a premixing tank and a first ultrapure water tank connected to the premixing tank. The premixing tank is set on a first balance. A first main dispersion device and a first auxiliary dispersion device are set on the premixing tank. The catalyst is fed into the premixing tank through the catalyst feeding port.

3. The fuel cell slurry preparation system according to claim 2, characterized in that, The first primary dispersing device is a high-speed shear disperser or a planetary mixer, and the first auxiliary dispersing device is a high-shear homogenizer or an ultrasonic disperser.

4. The fuel cell slurry preparation system according to any one of claims 1 to 3, characterized in that, The liquid feeding premixing unit includes a dispersion storage tank, a second peristaltic pump, a second ultrapure water tank, and multiple material tanks. The second ultrapure water tank and multiple material tanks are connected to the inlet end of the second peristaltic pump, and the outlet end of the second peristaltic pump is connected to the dispersion storage tank. A second main dispersion device and a second auxiliary dispersion device are installed on the dispersion storage tank.

5. The fuel cell slurry preparation system according to claim 4, characterized in that, The distributed storage tanks are located on the second day of the month.

6. The fuel cell slurry preparation system according to claim 4, characterized in that, The second main dispersing device is a high-speed shear disperser or a planetary mixer, and the second auxiliary dispersing device is a high-shear homogenizer or an ultrasonic disperser.

7. The fuel cell slurry preparation system according to any one of claims 4 to 6, characterized in that, The continuous circulating dispersion pulping unit includes a first diaphragm pump and a circulating dispersion pulping equipment. The inlet end of the first diaphragm pump is connected to the dispersion storage tank, and the outlet end of the first diaphragm pump is connected to the circulating dispersion pulping equipment.

8. The fuel cell slurry preparation system according to claim 7, characterized in that, The circulating dispersion slurry preparation equipment is a high-shear homogenizer or a sand mill.

9. The fuel cell slurry preparation system according to any one of claims 4 to 8, characterized in that, The coating unit is connected to the dispersion storage tank via a second diaphragm pump, and the coating unit and the second diaphragm pump are connected to the waste liquid recovery tank.

10. A method for preparing fuel cell slurry, characterized in that, The fuel cell slurry preparation system according to any one of claims 1 to 9 is used, and includes the following steps: S1. The catalyst dry powder premixing unit mixes the catalyst and ultrapure water to form a premix. S2. The liquid feeding premixing unit mixes the premixed material and various liquid materials to form a mixture; S3. The continuous circulating dispersion pulping unit disperses the mixture from the liquid feeding premixing unit in a secondary manner and forms a slurry through circulating pulping. S4. The slurry enters the coating unit for coating.

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