A Method for Eliminating Contamination of Fuel Cell Coolant

Abstract

The invention relates to a method for eliminating fuel cell coolant pollution, comprising the following steps: (1) placing the fuel cell stack polluted by the coolant on a test bench, setting the working temperature of the fuel cell stack to 50-65°C, and using a certain The flow-humidified oxidizing gas purges the cathode and anode of the fuel cell at the same time, and the inlet direction of the purge gas is opposite to the normal operation of the fuel cell stack; A certain flow rate of humidified reducing gas is used to purge the cathode and anode of the fuel cell stack at the same time; (3) after the above-mentioned purge is completed, the cathode and anode are purged with nitrogen, and the temperature of the fuel cell stack is set at 50-65°C. Air is fed into the cathode of the fuel cell stack, hydrogen is fed into the anode, the load is connected, and the current density of the fuel cell stack is continuously increased to complete pollution elimination and reactivation. Compared with the prior art, the invention has the advantages of good elimination effect and low cost.

Description

technical field [0001] The present invention relates to fuel cells, in particular to a method for eliminating the pollution of fuel cell cooling fluid. Background technique [0002] As the core component of the fuel cell engine, the proton exchange membrane fuel cell maintains the capability output process of the entire fuel cell system. Due to the high energy conversion efficiency of fuel cells, which breaks through the efficiency limitations of traditional internal combustion engines, fuel cell engines are becoming the most important development direction of power vehicle devices in the future. The membrane electrode (Membrane ElectrodeAssembly, MEA) and the bipolar plates on both sides constitute the basic unit of the fuel cell—the single cell, and several such single cells are combined into a fuel cell stack according to practical application requirements to meet different power outputs. The most important component inside the fuel cell unit is the MEA, which catalyzes ...

AI Technical Summary

Problems solved by technology

However, during improper operation or long-term use of the fuel cell stack, the fuel cell cooling system accessories (such as the intercooler) fail, causing the coolant in the coolant circuit to enter the fuel cell stack to generate carboxylate and other anions, which are harmful to the platinum of the MEA. The base catalyst or the proton exchange membrane will cause pollution, which will affect the performance output of the fuel cell stack

[0004] Chinese patent 201210090009.7 adopts air purging, then water flushing, and then air purging to eliminate anion, sulfate and ethylene glycol pollutants in the fuel cell, but the ethylene glycol entering the stack cannot be thoroughly cleaned by water flushing, and It can make the uncontaminated MEA also be polluted by ethylene glycol; there are few reports on the method of cleaning the coolant pollution in the fuel cell stack. In order not to affect the use of the stack, it is very effective to remove the coolant inside the stack. necessary

However, this treatment method has the following disadvantages: (1) The cleaning process involves a huge amount of work; (2) The cleaning process is likely to cause pollution or damage to the structural parts of the stack; Poor stack voltage consistency; (4) MEA and other materials and labor waste

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