Drainage device and method for fuel cell system

Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a drainage device and method for a fuel cell system. According to the technical scheme, the drainage device of the fuel cell system comprises a gas-water separator, the gas-water separator comprises a gas-water separation cavity and a water storage cavity which are communicated with each other, the bottom of the water storage cavity is provided with a water outlet, the water outlet of the water storage cavity is connected with a drainage valve, the other end of the drainage valve is connected with a pore plate, and the other end of the pore plate is connected with a drainage pipe. The invention discloses a drainage method of a fuel cell system. The drainage method comprises the following steps: S1, separating hydrogen and water in fluid at an anode outlet of a galvanic pile by using a gas-water separator; s2, when the power of the fuel cell is high, normally opening the drain valve; when the power of the fuel cell is low, the drain valve is in a normally closed state and is periodically opened; and S3, water passing through the drainage valve is drained to a drainage pipe through the pore plate. The invention provides the drainage device and method for the fuel cell system, which can timely and effectively discharge separated water and prevent hydrogen from being discharged.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a drainage device and method for a fuel cell system. Background technique [0002] A fuel cell is a device that converts the chemical energy in hydrogen fuel into electrical energy through an electrochemical reaction. Because of its high energy conversion rate, clean and pollution-free reaction products, and strong adaptability, it is regarded as a promising energy source. powerplant. [0003] The reaction product of a hydrogen fuel cell is only water, which is mainly produced at the cathode. However, due to the influence of the concentration gradient between the cathode and the anode, the water produced at the cathode will permeate through the proton exchange membrane to the anode. If gas-water separation is not performed, the separated water will be discharged in time. If there is water, there will inevitably be "water flooding" on the anode side, which will aff...

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Problems solved by technology

In terms of drainage methods, pulse discharge is widely used. Although this method is simple to operate, it is very easy to block the flow channel or cause large pressure fluctuations due to untimely drainage or excessive drainage under high power conditions. If the drainage time is too long, the hydrogen gas will be discharged, which will reduce the fuel utilization rate, and the frequent opening and closing of the drainage valve will also shorten its service life.

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