| 摘要 |
PROBLEM TO BE SOLVED: To reduce energy loss and simplify an apparatus in restoring the permeability of a paladium-based hydrogen separation membrane having hydrogen permeability lowered by keeping the temperature of a paladium-based hydrogen separation membrane apparatus at the hydrogen-separation operation temperature or higher and by causing steam to flow through the before-permeation side. SOLUTION: In producing high-purity hydrogen, a feed gas introduction valve 14 and a steam introduction valve 15 are opened to supply the raw material and steam to a steam reforming apparatus 10. In this apparatus 10, the raw material is reacted with steam to produce a hydrogen-containing gas, which is supplied to a hydrogen separation membrane apparatus 1. In restoring the permeability of a hydrogen separation membrane having hydrogen permeability lowered, the feed gas introduction valve is closed while the steam introduction valve 15 is kept open, thus reducing the pressures of the steam reforming apparatus 10 and the hydrogen separation membrane apparatus 1 to the atmospheric pressure. The permeability can also be restored by causing steam to flow through the beforepermeation side of the hydrogen separation membrane apparatus 1 while the temperature of the apparatus 1 is kept at 200-600 deg.C.
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