PURPOSE:To make operation easy, and to raise energy efficiency, by making a mixed gas of methanol and steam flow through a catalytic layer of reaction tubes, circulating a combustion gas between an inner column and a group of reaction tubes. CONSTITUTION:The inner column 3 is set in the cylindrical container 1, tube sheets are laid at the upper and the lower parts of the container 1 and the inner column 3, and the tube sheets are provided with the sheath pipes 22. The reaction tubes 6 containing the catalytic layer 24 are inserted into the sheath pipes 22, and supported on the top of the sheath pipes 22. The heights at the tops of the reaction tubes 6 are stepwise varied by taking header attachment into account. The circulating fan 5 is set at the top of the inner column 3. Another cylindrical column 9 is laid in the inner column 3, and a combustion gas from a burner is introduced into the cylindrical column. The inlet regulator 11 for secondary air is set before an inlet of the combustion gas, and the heater 10 for a mixed gas of methanol and steam is set at the rear part of the flow. By this reforming device, methanol is efficiently decomposed to give hydrogen.
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