Patent ID: 7883672

Claim:
A small cylindrical reformer, comprising: a combustion unit, which includes: a combustion part to burn air and fuel supplied from an air fuel inlet, a combustion gas distributor to distribute the combustion gas burned in the combustion part, and a first combustion gas passage and a second combustion gas passage to guide the distributed combustion gas into an outlet to be discharged; and a fuel-converting catalytic reaction unit, which includes: two reforming reaction parts preparing a reforming reaction reformate, each having a reforming catalyst to reform feed and water supplied from a feed/water inlet, and a water gas shift reaction part preparing a water gas shift reformate, between the two reforming reaction parts to decrease a concentration of carbon monoxide in the reforming reacting reformate, wherein the combustion reaction unit and the fuel-converting catalytic reaction unit are structured as six cylindrical pipes to realize optimal heat exchange efficiency, and preferential oxidation reactor is provided between first air fuel preheating passages in the combustion part to decrease the concentration of carbon monoxide in the water gas shift reformate to a predetermined level or lower.