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Method of controlling injection of oxygen into hydrogen-rich fuel cell feed stream

United States Patent

6,265,092
July 24, 2001
View the Complete Patent at the US Patent & Trademark Office
A method of operating a H.sub.2 --O.sub.2 fuel cell fueled by hydrogen-rich fuel stream containing CO. The CO content is reduced to acceptable levels by injecting oxygen into the fuel gas stream. The amount of oxygen injected is controlled in relation to the CO content of the fuel gas, by a control strategy that involves (a) determining the CO content of the fuel stream at a first injection rate, (b) increasing the O.sub.2 injection rate, (c) determining the CO content of the stream at the higher injection rate, (d) further increasing the O.sub.2 injection rate if the second measured CO content is lower than the first measured CO content or reducing the O.sub.2 injection rate if the second measured CO content is greater than the first measured CO content, and (e) repeating steps a-d as needed to optimize CO consumption and minimize H.sub.2 consumption.
Meltser; Mark Alexander (Pittsford, NY), Gutowski; Stanley (Pittsford, NY), Weisbrod; Kirk (Los Alamos, NM)
General Motors Corporation (Detroit, MI)
09/ 550,054
April 14, 2000
The Government of the United States of America has rights in this invention pursuant to Agreement No. DE-AC02-90CH10435 awarded by the U.S. Department of Energy.