REFORMER, REFORMING UNIT, AND FUEL CELL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a reforming unit which can prevent degradation of a catalyst by a simple configuration even in the state where stop control cannot be performed.

SOLUTION: An exhaust gas cooler 840 includes an exhaust gas discharge flow path in which a combustion gas for a burner unit 151 for heating a reforming catalyst in a reformer 620 circulates and a pure water flow path for circulating pure water for producing water vapor which is heat-exchanged with the exhaust gas discharge flow path and mixed with a source gas. A part of the pure water flow path in a circulation direction is provided with a pure water stagnating part 846 having a larger cross-sectional area in a circulation direction than other positions. In an emergency shutdown where stop control cannot be performed, the stagnating pure water produces water vapor by the remaining heat from the heating of the burner unit 151 to purge the inside of a reforming vessel 622, a CO converter 810, and a CO selective oxidation apparatus 830, Thus, the occurrence of coking can be prevented by a simple structure in which the size of a part of the flow path is increased.

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