Fuel cell system
First Claim
1. A fuel cell system, comprising:
- a fuel cell stack configured to have a plurality of fuel cells;
a fuel gas supply unit configured to supply fuel gas to an anode of the fuel cell stack;
an oxidant gas supply unit configured to supply oxidant gas to a cathode of the fuel cell stacka gas circulator configured to circulate anode off gas discharged from the anode to the anode;
a purge valve configured to discharge the anode off gas to the outside; and
a controller configured to, at an activation time of the system, close the purge valve, drive the gas circulator, and supply the fuel gas from the fuel gas supply unit to the anode,wherein after a predetermined condition has been satisfied, the controller increases an anode operating pressure to a target operating pressure.
1 Assignment
0 Petitions
Accused Products
Abstract
A system controller drives a gas circulator with a purge valve closed to supply hydrogen to a fuel cell stack and then increases anode operating pressure and cathode operating pressure to target operating pressures after a predetermined condition is satisfied. This allows an amount of gas mixture of remaining oxygen and hydrogen to be suppressed compared to the case of increasing the anode operating pressure in a state where oxygen remains in the anode circulation path. Accordingly, it is possible to suppress local generation of electric potential and heat and prevent degradation of the components of the fuel cell stack. Moreover, hydrogen is not discharged during activation, which eliminates the need to include dilution equipment of combustion equipment for treating hydrogen and increases the degree of freedom in the layout of the fuel cell system.
-
Citations
16 Claims
-
1. A fuel cell system, comprising:
-
a fuel cell stack configured to have a plurality of fuel cells; a fuel gas supply unit configured to supply fuel gas to an anode of the fuel cell stack; an oxidant gas supply unit configured to supply oxidant gas to a cathode of the fuel cell stack a gas circulator configured to circulate anode off gas discharged from the anode to the anode; a purge valve configured to discharge the anode off gas to the outside; and a controller configured to, at an activation time of the system, close the purge valve, drive the gas circulator, and supply the fuel gas from the fuel gas supply unit to the anode, wherein after a predetermined condition has been satisfied, the controller increases an anode operating pressure to a target operating pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification