ANODE PROTECTION SYSTEM FOR SHUTDOWN OF SOLID OXIDE FUEL CELL SYSTEM

摘要

An Anode Protection Systems for a SOFC system, having a Reductant Supply and safety subsystem, a SOFC anode protection subsystem, and a Post Combustion and slip stream control subsystem. The Reductant Supply and safety subsystem includes means for generating a reducing gas or vapor to prevent re-oxidation of the Ni in the anode layer during the course of shut down of the SOFC stack. The underlying ammonia or hydrogen based material used to generate a reducing gas or vapor to prevent the re-oxidation of the Ni can be in either a solid or liquid stored inside a portable container. The SOFC anode protection subsystem provides an internal pressure of 0.2 to 10 kPa to prevent air from entering into the SOFC system. The Post Combustion and slip stream control subsystem provides a catalyst converter configured to treat any residual reducing gas in the slip stream gas exiting from SOFC stack.

主权项

1. An anode protection system (APS) for a fuel cell system having a fuel cell stack formed of a plurality of solid oxide fuel cells, wherein each solid oxide fuel cell includes an anode layer, said APS comprises of:
a reductant supply and safety subsystem having:
means for generating a reducing gas;means for passing the reducing gas over the anode layer during the shutdown or standby operation of the fuel cell stack; andmeans for controlling a flow of the reducing gas over the anode layer.