To provide a reformer for a hydrocarbon-based gas which prevents creep fatigue failure due to repeated use and can reduce the cost of equipment.
The reformer 1 which reforms a hydrocarbon-based gas to a hydrogen-rich reformed gas by bringing the hydrocarbon-based gas together with oxygen and water vapor into a catalytic reaction with a catalyst comprises an inner cylinder 34 in which a reforming catalyst 31 is put and which reforms the raw material gas introduced from the upstream end and discharges the reformed gas to the downstream end, and an outer case 33 which houses the inner cylinder 34 with a predetermined heat insulating space 37 left between the outer case 33 and the inner cylinder 34, wherein the inner cylinder 34 is fixed in the outer case 33 at the upstream end of the raw material gas, but at the downstream end opposite to the fixed end, the inner cylinder 34 has a predetermined gap 40 between it and the outer case 33 and is not fixed in the outer case 33. A relatively inexpensive material is used for the outer case 33 to reduce the cost and stress concentration by the thermal expansion difference between the inner cylinder 34 and the outer case 33 is absorbed in the predetermined gap 40 to prevent creep fatigue failure.
JO HISANAO
MATSUDA HIDEAKI
AKASAKA HIDESHI
MICHITANI KAZUO
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