Fuel cell system with electrochemical anode exhaust recycling
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, wherein the fuel cell stack is a solid oxide fuel cell stack;
operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream;
lowering a temperature of a fuel exhaust stream to between 120°
C. and 200°
C. by exchanging heat with the fuel inlet stream and then with an air inlet stream;
passing the lower temperature fuel exhaust stream to a splitter;
passing a first portion of the lower temperature fuel exhaust stream to a high temperature, low hydration ion exchange membrane cell stack and a second portion of the lower temperature fuel exhaust stream into the fuel inlet stream;
separating at least a portion of hydrogen contained in the fuel exhaust stream using the high temperature, low hydration ion exchange membrane cell stack;
providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream; and
heating the air inlet stream, which is preheated by the fuel exhaust stream, using heat from an air exhaust stream;
wherein an AC electrical efficiency of the system is at least 50% and an effective fuel utilization is at least 94%.
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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 high temperature, low hydration ion exchange membrane cell stack, and providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream.
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Citations
10 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, wherein the fuel cell stack is a solid oxide fuel cell stack; operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream; lowering a temperature of a fuel exhaust stream to between 120°
C. and 200°
C. by exchanging heat with the fuel inlet stream and then with an air inlet stream;passing the lower temperature fuel exhaust stream to a splitter; passing a first portion of the lower temperature fuel exhaust stream to a high temperature, low hydration ion exchange membrane cell stack and a second portion of the lower temperature fuel exhaust stream into the fuel inlet stream; separating at least a portion of hydrogen contained in the fuel exhaust stream using the high temperature, low hydration ion exchange membrane cell stack; providing the hydrogen separated from the fuel exhaust stream into the fuel inlet stream; and heating the air inlet stream, which is preheated by the fuel exhaust stream, using heat from an air exhaust stream; wherein an AC electrical efficiency of the system is at least 50% and an effective fuel utilization is at least 94%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification