Patent ID: 7635399

Claim:
A fuel reformer, comprising: a high-temperature unit having a combustion chamber in which fuel is burned, and a reforming section disposed on an outer peripheral surface side of the combustion chamber, surrounding the combustion chamber and filled with a reforming catalyst in an annular shape; a medium-low-temperature unit having a shift converter section located on a side where the medium-low-temperature unit is connected to the high-temperature unit and filled with a shift converter catalyst in a cylindrical or annular shape, and a selective oxidation section located on a side opposite the side where the medium-low-temperature unit is connected to the high-temperature unit and filled with a selective oxidation catalyst in a cylindrical or annular shape; a connection flow pipe for supplying reformate having passed through the reforming section of the high-temperature unit to the shift converter section side in the medium-low-temperature unit; a vessel for integrally housing the high-temperature unit and the medium-low-temperature unit connected by the connection flow pipe; a reforming additive water passage formed in a gap between outer walls of the high-temperature unit and the medium-low-temperature unit and an inner wall of the vessel; a reforming additive water injection port provided at an end of the reforming additive water passage on a side opposite the side where the medium-low-temperature unit is connected to the high-temperature unit; a reforming material supply passage for supplying reforming material to the high-temperature unit; a second reforming additive water passage for supplying reforming additive water directly to the high-temperature unit, not through the medium-low-temperature unit; and a mixing chamber communicating the reforming additive water passage, the reforming material supply passage and the second reforming additive water passage.