Process for providing a pure hydrogen stream for use with fuel cells
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United States of America Patent
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Oct 9, 2001
Grant Date -
N/A
app pub date -
Jun 18, 1999
filing date -
Jun 18, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Hydrogen generation and fuel cell operation are integrated through the use of a low-cost hydrogen generation zone which comprises a pre-reforming zone, a partial oxidation zone, a reforming zone, and a water gas shift zone. Anode waste gas from the fuel cell is burned to provide heat to pre-reform the feed to the hydrogen generation zone while the burner exit temperature and the reforming zone exit temperatures are controlled to eliminate thermal cycling in the hydrogenation zone. This simplified control of the hot side temperatures in the hydrogen generation zone below about 700.degree. C. combined with use of the pre-reforming zone, surprisingly permits the use of carbon steel and/or stainless steel for construction of the hydrogenation zone while providing an efficient system which does not require external fuel and offers a high degree of feedstock flexibility at low cost.
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