Method for high temperature fuel cell system start up and shutdown
First Claim
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1. A method of operating a fuel cell system comprising a fuel cell stack, and a PEM stack, said method comprising:
- operating said fuel cell stack in a steady state operating mode by;
providing a fuel inlet stream to the fuel cell stack;
providing a fuel exhaust stream from the fuel cell stack to the PEM stack; and
providing a hydrogen stream from the PEM stack to the fuel inlet stream; and
switching from the steady state operating mode to a shut down operating mode and operating said fuel cell stack in said shut down operating mode by;
providing a fuel inlet stream to the PEM stack;
providing an air stream to the PEM stack; and
providing power from the PEM stack to at least one auxiliary component of the system.
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Abstract
A fuel cell system includes a fuel cell stack and a PEM stack for providing power to the system in a start up or shut down operating mode and hydrogen to the fuel cell stack in a steady state operating mode.
110 Citations
14 Claims
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1. A method of operating a fuel cell system comprising a fuel cell stack, and a PEM stack, said method comprising:
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operating said fuel cell stack in a steady state operating mode by;
providing a fuel inlet stream to the fuel cell stack;
providing a fuel exhaust stream from the fuel cell stack to the PEM stack; and
providing a hydrogen stream from the PEM stack to the fuel inlet stream; andswitching from the steady state operating mode to a shut down operating mode and operating said fuel cell stack in said shut down operating mode by;
providing a fuel inlet stream to the PEM stack;
providing an air stream to the PEM stack; and
providing power from the PEM stack to at least one auxiliary component of the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a fuel cell system comprising a fuel cell stack, and a PEM stack, said method comprising:
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operating said fuel cell stack in a start up operating mode by;
providing a fuel inlet stream to the PEM stack;
providing an air stream to the PEM stack; and
providing power from the PEM stack to at least one auxiliary component of the system;switching from the start up operating mode to a steady state operating mode and operating said fuel cell stack in said steady state operating mode by;
providing a fuel inlet stream to the fuel cell stack;
providing a fuel exhaust stream from the fuel cell stack to the PEM stack;
providing power to the PEM stack to operate the PEM stack in electrolysis mode to separate hydrogen from fuel cell stack exhaust stream; and
providing the separated hydrogen stream from the PEM stack to the fuel inlet stream of the fuel cell stack; andswitching from the steady state operating mode to a shut down operating mode and operating said fuel cell stack in said shut down operating mode by;
providing a fuel inlet stream to the PEM stack;
providing an air stream to the PEM stack; and
providing power from the PEM stack to the at least one auxiliary component of the system. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification