Fuel cell exhaust system and starting method thereof

Abstract

The invention discloses a tail discharge system for a fuel battery and a starting method for the tail discharge system. The tail discharge system comprises a primary heating tail discharge solenoid valve and an auxiliary heating tail discharge solenoid valve which is arranged above the primary heating tail discharge solenoid valve. The starting method comprises the following steps: electrifying and heating the primary heating tail discharge solenoid valve and the auxiliary heating tail discharge solenoid valve during starting, and introducing a corresponding reaction gas into the fuel battery; then, starting the primary heating tail discharge solenoid valve which is matched with a corresponding gas discharge pipeline to determine whether the gas pressure of a gas inlet of the primary heating tail discharge solenoid valve or the gas pressure of the corresponding gas supply pipeline is suddenly reduced or not; if the pressure is suddenly reduced, stopping electrifying and heating the primary heating tail discharge solenoid valve and the auxiliary heating tail discharge solenoid valve, and performing follow-up pulse gas emission by starting the primary heating tail discharge solenoid valve; if the pressure is not suddenly dropped, adopting a circulating and unblocking strategy of firstly starting the primary heating tail discharge solenoid valve and then starting the auxiliary heating tail discharge solenoid valve until the primary heating tail discharge solenoid valve can be used for discharging gas. According to the tail discharge system for the fuel battery and the starting method for the tail discharge system disclosed by the invention, the problem that the starting time of the fuel battery system is too long under a subzero low-temperature environment can be improved.

Description

technical field [0001] The present invention relates to the field of fuel cells, and more specifically relates to a fuel cell exhaust system and a starting method thereof. Background technique [0002] A fuel cell is a power generation device that converts chemical energy present in fuel and oxidant directly into electrical energy. There are two main types of fuel cells: [0003] 1) For fuel cells that use air as the oxidant, the anode usually adopts a pulse exhaust method, that is, the hydrogen exhaust solenoid valve connected to the fuel cell anode exhaust pipeline is periodically switched. When the hydrogen exhaust solenoid valve is opened, the anode will be discharged. The exhaust gas also discharges the water remaining in the anode of the fuel cell. Therefore, it is inevitable that liquid water will remain in the valve core and the surrounding area of ​​the anode hydrogen exhaust solenoid valve. When the fuel cell system operates in a sub-zero environment, once the f...

AI Technical Summary

Problems solved by technology

However, since there is often more ice in the valve core of the oxygen exhaust solenoid valve, the heating time is long, so the start-up time of the fuel cell system is relatively long in sub-zero low temperature environments.

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