Process for air enrichment in producing hydrogen for use with fuel cells
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United States of America Patent
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Issued Date -
Oct 3, 2002
app pub date -
Dec 8, 2000
filing date -
Dec 8, 2000
priority date (Note) -
Abandoned
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Abstract
Hydrogen generation and fuel cell operation are integrated through the use of a fuel processor or hydrogen generation zone which comprises a pre-reforming zone, a partial oxidation zone, a reforming zone, a water gas shift zone and a preferential oxidation zone. According to the present invention, an oxygen-enriched stream is provided to the fuel processor and to the fuel cell from the adsorption effluent withdrawn from an adsorption zone. The oxygen-enriched stream is depleted in nitrogen which improved the efficiency of the fuel processor and the fuel cell by reducing nitrogen dilution. A further advantage resulted in fuel processor/fuel cell systems which burn the anode waste gas in a combustion zone to provide heat to the fuel processor zone. By diluting the anode waste gas with an oxygen-reduced gas, it is possible to maintain the combustion temperature in the convection range and reduce or eliminate the amount of excess air employed in the combustion zone
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