Method for eliminating fuel cell coolant pollution

Abstract

The invention relates to a method for eliminating fuel cell coolant pollution, which comprises the following steps of (1) placing a fuel cell stack polluted by coolant on a test board, setting the working temperature of the fuel cell stack to be 50-65 DEG C, and simultaneously purging a cathode and an anode of a fuel cell by adopting a certain flow of humidified oxidizing gas, ane enabling the gas inlet direction of the purge gas to be opposite to the normal working direction of the fuel cell stack, (2) after the purging is finished, purging the cathode and the anode by adopting nitrogen, and simultaneously purging the cathode and the anode of the fuel cell stack by adopting a certain flow of humidified reducing gas, and (3) after the purging is finished, purging the cathode and the anode by adopting nitrogen, setting the temperature of the fuel cell stack to be 50-65 DEG C, introducing air into the cathode of the fuel cell stack, introducing hydrogen into the anode, switching on a load, and continuously increasing the current density of the fuel cell stack to finish pollution elimination and reactivation. Compared with the prior art, the method has the advantages of good elimination effect, low cost and the like.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a method for eliminating the pollution of the fuel cell cooling fluid. Background technique [0002] As the core component of the fuel cell engine, the proton exchange membrane fuel cell maintains the capacity output process of the entire fuel cell system. Due to the high energy conversion efficiency of fuel cells, which breaks through the efficiency limitation 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 Electrode Assembly, MEA) and the bipolar plates on both sides constitute the basic unit of the fuel cell—a single cell. Several such single cells are combined into a fuel cell stack to meet different power outputs according to practical application needs. The most important part inside the fuel cell is the MEA, which can catalyze the conversion of chemica...

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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