PURGING METHOD FOR FUEL CELL SYSTEM

摘要

PURPOSE: A purging method for a fuel cell system is provided to improve impurities discharge performance, to obtain stable stack output, and to increase fuel efficiency due to the improvement of electric chemistry reaction. CONSTITUTION: A purging method for a fuel cell system to discharge impurities inside a fuel cell stack is carried out through supply hydrogen controlled in a pulse pressure state by controlling a hydrogen pressure inside a stack by periodically opening and closing a hydrogen supply valve(15) located at the front end of the fuel cell stack(1). A hydrogen recirculation valve(16) located at a hydrogen recirculation line and a hydrogen purge valve(18) located at an anode outlet side line of a fuel cell stack.