Modifying device

A shift conversion unit having a shift reaction section (10) for causing hydrogen-rich reformed gas produced by partial oxidation of feed gas that is composed of hydrocarbon gas, oxidizing gas and steam in a reforming reaction section (6) to undergo shift conversion by water gas shift reaction with a shift conversion catalyst, comprising:

• a heat exchanger (23) including a reformed gas side heat transfer fin (21) presented to the reformed gas passage (11) and a feed gas side heat transfer fin (22) presented to the feed gas passage (3) and exchanges heat of reaction and sensible heat in the shift reaction section (10) with heat of the feed gas in the feed gas passage (3),
• wherein the shift reaction section (10) is arranged to introduce the reformed gas from the reforming reaction section (6) directly into a reformed gas passage (11) and effect the shift reaction while heat-exchanging the reformed gas with the feed gas, and
• the shift conversion catalyst of the shift reaction section (10) is applied to or supported on at least the reformed gas side heat transfer fin (21).