Fuel cell system with one hundred percent fuel utilization
First Claim
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1. A method of operating a fuel cell system, comprising:
- providing a fuel inlet stream into a fuel cell stack;
operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream;
separating at least 95% of hydrogen contained in the fuel exhaust stream using a cascaded electrochemical hydrogen pump; and
providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream.
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Abstract
A method of operating a fuel cell system includes providing a fuel inlet stream into a fuel cell stack, operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream, separating at least a portion of hydrogen contained in the fuel exhaust stream using a cascaded electrochemical hydrogen pump, such as a high temperature, low hydration ion exchange membrane cell stack having at least two membrane cells arranged in process fluid flow series, and providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream.
112 Citations
20 Claims
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1. A method of operating a fuel cell system, comprising:
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providing a fuel inlet stream into a fuel cell stack; operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream; separating at least 95% of hydrogen contained in the fuel exhaust stream using a cascaded electrochemical hydrogen pump; and providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel cell system, comprising:
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a fuel cell stack; a cascaded electrochemical hydrogen pump; a first conduit which operatively connects a fuel exhaust outlet of the fuel cell stack to a first inlet of the cascaded electrochemical hydrogen pump; and a second conduit which operatively connects a first outlet of the cascaded electrochemical hydrogen pump to a fuel inlet of the fuel cell stack. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A fuel cell system, comprising:
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a fuel cell stack; and a first means for separating at least 95% of hydrogen contained in a stack fuel exhaust stream and for providing the hydrogen separated from the fuel exhaust stream into a stack fuel inlet stream.
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Specification