CN-122000367-A - Fuel cell pulping system and method

Abstract

The invention discloses a fuel cell pulping system which comprises a catalyst dry powder premixing unit, a liquid feeding premixing unit connected with the catalyst dry powder premixing unit, a continuous circulation 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. The fuel cell pulping system can realize accurate, rapid and automatic feeding and slurry dispersing, improve the pulping speed of the fuel cell, and improve the utilization rate of materials. The invention also discloses a fuel cell pulping method.

Inventors

• WANG RUYI
• WANG YAN
• Gu Zaode

Assignees

• 安徽瑞氢动力科技有限公司

Dates

Publication Date

20260508

Application Date

20241104

Claims (10)

1. 1. The fuel cell pulping system is characterized by comprising a catalyst dry powder premixing unit, a liquid feeding premixing unit connected with the catalyst dry powder premixing unit, a continuous circulation 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; The catalyst dry powder premixing unit is used for mixing the catalyst and the ultrapure water to form a premix; The liquid feeding premixing unit is used for mixing the premix and a plurality of liquid materials to form a mixture; the continuous circulation dispersion pulping unit is configured to secondarily disperse the mixture from the liquid feed premix unit, form a slurry by circulation pulping, and enable the slurry to be returned to the liquid feed premix unit.
2. 2. The fuel cell pulping system of claim 1, wherein the catalyst dry powder premixing unit comprises a premixing tank and a first ultrapure water tank connected to the premixing tank, the premixing tank is disposed on a first balance, a first main dispersing device and a first auxiliary dispersing device are disposed on the premixing tank, and the catalyst is put into the premixing tank through a catalyst feed opening.
3. 3. The fuel cell pulping system of claim 2, wherein the first primary dispersing device is a high-speed shear dispersing machine or a planetary mixer and the first secondary dispersing device is a high-shear homogenizer or an ultrasonic dispersing machine.
4. 4. A fuel cell pulping system according to any of claims 1-3, wherein the liquid feeding premix unit comprises a dispersion storage tank, a second peristaltic pump, a second ultrapure water tank and a plurality of material tanks, the second ultrapure water tank and the plurality of material tanks are connected with an inlet end of the second peristaltic pump, an outlet end of the second peristaltic pump is connected with the dispersion storage tank, and a second main dispersion device and a second auxiliary dispersion device are arranged on the dispersion storage tank.
5. 5. The fuel cell pulping system of claim 4, wherein the dispersion storage tank is disposed on a second scale.
6. 6. The fuel cell pulping system of claim 4, wherein the second primary dispersing device is a high-speed shear dispersing machine or a planetary mixer and the second secondary dispersing device is a high-shear homogenizer or an ultrasonic dispersing machine.
7. 7. The fuel cell pulping system of any of claims 4 to 6, wherein the continuous circulation dispersion pulping unit includes a first diaphragm pump and a circulation dispersion pulping device, an inlet end of the first diaphragm pump is connected to the dispersion storage tank, and an outlet end of the first diaphragm pump is connected to the circulation dispersion pulping device.
8. 8. The fuel cell pulping system of claim 7, wherein the circulating dispersion pulping apparatus is a high shear homogenizer or a sand mill.
9. 9. The fuel cell pulping system of any one of claims 4 to 8, wherein the coating unit is connected to the dispersion storage tank by a second diaphragm pump, and the coating unit and the second diaphragm pump are connected to a waste liquid recovery tank.
10. 10. A fuel cell pulping method characterized by employing the fuel cell pulping system of any one of claims 1 to 9, and comprising the steps of: S1, mixing a catalyst and ultrapure water by the catalyst dry powder premixing unit to form a premix; S2, the liquid feeding premixing unit mixes the premix and a plurality of liquid materials to form a mixture; s3, the continuous circulation dispersion pulping unit carries out secondary dispersion on the mixture from the liquid feeding premixing unit, and pulp is formed through circulation pulping; S4, the sizing agent enters the coating unit to be coated.

Description

Fuel cell pulping system and method Technical Field The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell pulping system and a method. Background The fuel cell membrane electrode is used as a core for hydrogen fuel cell reaction, and the preparation process mainly comprises core procedures of catalyst slurry preparation, catalytic layer coating forming, CCM forming, GDL packaging forming and the like. Among them, the preparation of the catalyst slurry is the first step of membrane electrode preparation, which is the most critical step, and not only determines the quality of subsequent coating, but also determines the performance and durability of the membrane electrode produced subsequently. Therefore, optimizing the proportion and preparation process of the fuel cell slurry is an important content of iterative optimization of the current membrane electrode. In general, the fuel cell slurry is prepared by mixing and dispersing a Pt/C catalyst, an ionomer solution, an alcohol solvent and ultrapure water according to a certain proportion and sequence. Because Pt/C catalysis has the characteristics of easy burning, easy agglomeration and sedimentation, easy oxidative deterioration with alcohol, easy wall scraping residue, high price and the like, the existing slurry preparation often adopts a scheme of 'manual weighing and feeding and proportioning' and 'single-time and instant use'. So that the problems of low pulping efficiency, high catalyst waste rate and the like cannot meet the requirements of slurry rapid iterative optimization and catalyst utilization rate improvement. It is desirable to provide an improved fuel cell pulping system, particularly with respect to how to increase fuel cell pulping speed and increase catalyst utilization. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fuel cell pulping system for improving the pulping speed of a fuel cell. In order to solve the technical problems, the invention adopts the technical scheme that the fuel cell pulping system comprises a catalyst dry powder premixing unit, a liquid feeding premixing unit connected with the catalyst dry powder premixing unit, a continuous circulation 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; The catalyst dry powder premixing unit is used for mixing the catalyst and the ultrapure water to form a premix; The liquid feeding premixing unit is used for mixing the premix and a plurality of liquid materials to form a mixture; the continuous circulation dispersion pulping unit is configured to secondarily disperse the mixture from the liquid feed premix unit, form a slurry by circulation pulping, and enable the slurry to be returned to the liquid feed premix unit. The catalyst dry powder premixing unit comprises a premixing tank and a first ultrapure water tank connected with the premixing tank, the premixing tank is arranged on a first balance, a first main dispersing device and a first auxiliary dispersing device are arranged on the premixing tank, and a catalyst is put into the premixing tank through a catalyst feeding port. The first main dispersing device is a high-speed shearing dispersing machine or a planetary stirrer, and the first auxiliary dispersing device is a high-shearing homogenizing machine or an ultrasonic dispersing machine. The liquid feeding premixing unit comprises a dispersion storage tank, a second peristaltic pump, a second ultrapure water tank and a plurality of material tanks, wherein the second ultrapure water tank and the material tanks are connected with the inlet end of the second peristaltic pump, the outlet end of the second peristaltic pump is connected with the dispersion storage tank, and a second main dispersing device and a second auxiliary dispersing device are arranged on the dispersion storage tank. The dispersion storage tank is arranged on the second balance. The second main dispersing device is a high-speed shearing dispersing machine or a planetary stirrer, and the second auxiliary dispersing device is a high-shearing homogenizing machine or an ultrasonic dispersing machine. The continuous circulation dispersion pulping unit comprises a first diaphragm pump and circulation dispersion pulping equipment, wherein the inlet end of the first diaphragm pump is connected with the dispersion storage tank, and the outlet end of the first diaphragm pump is connected with the circulation dispersion pulping equipment. The circulating dispersion pulping equipment is a high-shear homogenizer or a sand mill. The coating unit is connected with the dispersion storage tank through a second diaphragm pump, and the coating unit and the second diaphragm pump are connected with the waste liquid recovery tank. The invention als