A proton exchange membrane fuel cell stack blow-by gas flow detection device and method

Abstract

The invention discloses a proton exchange membrane fuel cell stack fuel chamber and an oxidizer chamber blow-by gas flow detection device and method. Two branch pipes led out from a main pipe of test gas are respectively connected to a fuel inlet pipe and an oxidizer inlet pipe. And set an electric pressure reducing valve and a high-precision flowmeter on the test gas main line; the specific method is to measure the flow Q1 of the fuel chamber and oxidant chamber to the external environment and the test gas main line, and the fuel chamber to the external environment, oxidant chamber and test The flow Q2 of the gas main pipe permeates, the flow Q3 of the oxidant chamber to the external environment, the fuel chamber and the test gas main pipe, (Q2+Q3‑Q1) / 2 is the blow-by gas flow of the fuel chamber and the oxidizer chamber. The invention has the advantages of: remote unmanned detection can be realized, fast and efficient, labor saving, intuitive detection results, high accuracy and high safety.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a proton exchange membrane fuel cell stack fuel chamber and an oxidant chamber blow-by gas flow detection device and detection method. Background technique [0002] The core components of a proton exchange membrane fuel cell are membrane electrodes and bipolar plates, both of which form an oxidant chamber and a fuel chamber through a sealed structure, and the oxidant side plate and the fuel side plate form a coolant chamber through a sealed structure. For stacks that use internal shared pipelines, the above sealing structure has three functions: one is to prevent the leakage of oxidant, fuel and coolant; the other is to prevent fuel and oxidant from crossing through the shared pipeline; Mutual channeling of shared pipes. [0003] Among them, the blow-by gas in the stack fuel cavity and the oxidant cavity is the most harmful. If the flow rate of blow-by gas in the fuel cha...

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Problems solved by technology

This method is greatly affected by human beings, and requires multiple measurements to take the average value; and the drainage method may damage the measurement container or injure the tester when collecting gas, which is not safe

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