| 摘要 |
A fuel cell system comprises a reformer ( 8 ) which produces reformate gas containing hydrogen using gas containing oxygen and raw material vapor, and a fuel cell ( 9 ) which generates power by reacting hydrogen in the reformate gas with oxygen. A controller ( 21 ) determines whether or not excess hydrogen has been produced by the reformer ( 8 ), and when it is determined that excess hydrogen was produced, burns the excess hydrogen to keep the reformer ( 8 ) warm.
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