Patent ID: 7153333

Claim:
A fuel reforming system of a fuel cell, comprising: a reforming reactor into which hydrocarbon fuel and oxygen are introduced to perform a partial oxidation reaction; a mixer provided downstream the reforming reactor, which injects water into gas heated by the partial oxidation reaction to vaporize the water, and mix the vaporized water with the gas; a shift reactor provided downstream the mixer, into which the gas containing vaporized water is introduced, and which performs a shift reaction; and a direct passage which leads gas from the reforming reactor to the shift reactor; wherein the mixer comprises: a manifold which crosses the direct passage and collects a part of gas from the reforming reactor; a premixer into which gas is led via the manifold; a water injection device which injects water into the part of gas led into the premixer; and a communicating passage which leads the mixture of water injected from the water injection device and the part of gas into the shift reactor, and a remainder of gas which is not collected by the manifold is introduced to the shift reactor via the direct passage.