Proton exchange membrane fuel cell stack gas blow by flow amount detection device and method

Abstract

The invention discloses a proton exchange membrane fuel cell stack gas blow by flow amount detection device, and a method. According to the proton exchange membrane fuel cell stack gas blow by flow amount detection device, two branch pipelines of a main pipeline used for testing gas are connected with a fuel inlet gas pipeline and an oxidant agent inlet gas pipeline respectively, an electrically operated pressure-reducing valve and a high precision flowmeter are arranged on the main pipeline used for testing gas. According to the method, penetration flow amount Q1 of a fuel chamber and an oxidant agent chamber to the external environment and the main pipeline used for testing gas is measured, penetration flow amount Q2 of the fuel chamber to the external environment, the oxidant agent chamber, and the main pipeline used for testing gas is measured, penetration flow amount Q3 of the oxidant agent chamber to the external environment, the fuel chamber, and the main pipeline used for testing gas is measured, and the fuel chamber and oxidant agent chamber gas blow by flow amount is (Q2+Q3 / Q1) / 2. The advantages are that: remote unmanned detection can be realized, speed is fast, efficiency is high, human labour is saved, detection results are visual, accuracy is high, and safety is high.

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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