Hydrogen emissions control during up-transients and cathode...

Details Hydrogen emissions control during up-transients and cathode... Hydrogen emissions control during up-transients and cathode...

2011-01-04

2011-01-04

Yuan, Dah-Wei D (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

C429S430000

Reexamination Certificate

active

07862941

ABSTRACT:
A fuel cell system that controls an anode exhaust gas bleed during power up-transients. The fuel cell system includes a by-pass valve that allows compressor air to by-pass the fuel cell stack and be directly emitted into the cathode exhaust gas stream. The system detects a power up-transient by monitoring the rate of closing of the by-pass valve and the rate of change of an increase in the compressor airflow set-point. If these parameters pass a certain threshold, then the system determines that a power up-transient is occurring, and prevents an anode exhaust gas bleed for a predetermined period of time. If cathode pulsing is occurring where power up-transients come one after another, then the system will continuously reset the time period for preventing the anode exhaust gas bleed until a second time limit is reached, where the bleed is then forced.

REFERENCES:
patent: 6821668 (2004-11-01), Perry et al.
patent: 2005/0123813 (2005-06-01), Matoba et al.

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