Staged venting of fuel cell system during rapid shutdown
- Palmyra, NY
- Columbia, MD
- Webster, NY
A venting methodology and system for rapid shutdown of a fuel cell apparatus of the type used in a vehicle propulsion system. H.sub.2 and air flows to the fuel cell stack are slowly bypassed to the combustor upon receipt of a rapid shutdown command. The bypass occurs over a period of time (for example one to five seconds) using conveniently-sized bypass valves. Upon receipt of the rapid shutdown command, the anode inlet of the fuel cell stack is instantaneously vented to a remote vent to remove all H.sub.2 from the stack. Airflow to the cathode inlet of the fuel cell stack gradually diminishes over the bypass period, and when the airflow bypass is complete the cathode inlet is also instantaneously vented to a remote vent to eliminate pressure differentials across the stack.
- Research Organization:
- General Motors LLC, Detroit, MI (United States)
- DOE Contract Number:
- AC02-90CH10435
- Assignee:
- General Motors Corporation (Detroit, MI)
- Patent Number(s):
- US 6395414
- OSTI ID:
- 874462
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
venting
fuel
cell
rapid
shutdown
methodology
apparatus
type
vehicle
propulsion
hsub2
air
flows
stack
slowly
bypassed
combustor
receipt
command
bypass
occurs
period
time
example
five
conveniently-sized
valves
anode
inlet
instantaneously
vented
remote
remove
airflow
cathode
gradually
diminishes
complete
eliminate
pressure
differentials
fuel cell
cell stack
air flow
pressure differential
cell apparatus
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