Hydrogen recirculation system using integrated motor generator energy
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United States of America Patent
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Apr 17, 2012
Grant Date -
Jun 4, 2009
app pub date -
Dec 3, 2007
filing date -
Dec 3, 2007
priority date (Note) -
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Abstract
A system for delivering a supply fluid stream to a fuel cell stack that discharges an unused fluid stream is provided. A fuel supply is adapted to provide a pressurized supply fluid stream. An expander is in fluid communication with the fuel supply and is configured to receive the pressurized supply fluid stream to reduce the pressure of the pressurized supply fluid stream and to generate mechanical energy in response to reducing the pressure of the pressurized supply fluid stream. An electric machine is operably coupled to the expander and for selectively converting the mechanical energy generated by the expander into electrical energy. A compressor/blower is capable of being driven by at least one of the mechanical energy and the electrical energy to control the flow of the unused fluid stream to the fuel cell stack for recirculating the unused fluid stream back to the fuel cell stack.
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