| 摘要 |
Provided is a fuel reforming apparatus wherein vacuum reforming tubes ( 13 ) are accommodated in a flow path ( 12 ) between an inner cylinder ( 9 a) of a heat-insulating vessel ( 9 ) and a furnace flue ( 11 ) arranged in the inner cylinder ( 9 a). Formed between the furnace flue ( 11 ) and a guide cylinder ( 21 ) accommodated in the furnace flue ( 11 ) is a gap though which combustion gas ( 28 ) generated in a combustor ( 10 ) is raised. A helical plate ( 22 ) is arranged in the flow path ( 12 ) such that the combustion gas ( 28 ) lowered in the flow path ( 12 ) flows across the reforming tubes ( 13 ). Thus, red heating of the furnace flue can be sufficiently conducted to sufficiently heat the reforming tubes through radiation heat transfer. As a result, heat transfer areas of the reforming tubes may be made smaller to reduce in size the reforming tubes. Since upper ends of the reforming tubes are not exposed to high temperature and the combustion gas lowered between the inner cylinder of the vessel and the furnace flue has no deflections in flow, heat inputs to the respective reforming tubes become uniform, leading to improvement in performance of and reduction in size of the reformer.
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