Fuel cell system and method for discharging fluid in the system

Abstract

There is provided a fuel cell system, wherein a controller configured to set the flow volume of a fluid in an anode flow path at an outlet of an anode of the fuel cell to a first flow volume, then set thereafter the flow volume of the fluid in the anode flow path at the outlet of the anode to a second flow volume which is smaller than the first flow volume, and discharge the water in the hydrogen discharge flow path by opening an exhaust and drain valve while the fluid is flowing at the second flow volume.

Description

technical field [0001] The present invention relates to a fuel cell system and a method for discharging fluid in the system. Background technique [0002] Impurities such as nitrogen and / or carbon monoxide and / or water accumulate in the inside of the fuel cell system and / or in the circulation flow path of the fuel off-gas due to power generation. In order to discharge such impurities and / or water to the outside, an exhaust and drain valve is installed on the discharge channel connected to the circulation channel, and by controlling the opening and closing of the exhaust and drain valve, the gas in the circulation channel is and / or technology in which water is expelled at regular intervals (exile technology). [0003] In addition, in order to ensure the starting performance of the fuel cell system at the freezing point, immediately before components (such as the above-mentioned exhaust and drain valves) constituting the fuel cell system reach 0°C, the gas stored in the flow ...

AI Technical Summary

Problems solved by technology

Insufficient drainage treatment in this way may cause the residual water to freeze in a sub-freezing environment, making it impossible to ensure start-up performance.

Images