NOVELTY - A fuel reforming system (20) comprises a fuel reformer (22); a carbon monoxide (CO) remover; a heat source (28); and a moving unit for moving the heat source relative to the fuel reformer and the CO remover, to control an amount of heat energy supplied to the fuel reformer and CO remover. The moving unit includes a drive motor, and a controller to control the operation of the drive motor.    USE - In a fuel cell system (claimed); useful for reforming a fuel containing hydrogen (e.g. butane, propane, methane, methanol, ethanol and liquefied natural gas) and producing reformed gas rich in hydrogen; useful in fuel cell systems such as phosphoric acid fuel cell, molten carbon fuel cell, solid oxide fuel cell, polymer electrolyte membrane fuel cell and alkaline fuel cell, for mobile devices, transportation devices and distributed power sources.    ADVANTAGE - The fuel reformer and the CO remover are directly heated by the heat source. Then, when the temperature of the CO remover reaches a catalyst activation temperature, the heat source can be moved to directly heat only the fuel reformer, thus enhancing the reforming effect and power generation efficiency of the fuel reforming system.    DETAILED DESCRIPTION - A fuel reforming system (20) comprises a fuel reformer (22); a carbon monoxide (CO) remover; a heat source (28); and a moving unit for moving the heat source relative to the fuel reformer and the CO remover, to control an amount of heat energy supplied to the fuel reformer and CO remover. The moving unit includes a drive motor, and a controller to control the operation of the drive motor. The fuel reformer produces a reformed gas having hydrogen as a main component, from a fuel containing hydrogen. The CO remover removes carbon monoxide from the reformed gas. The heat source supplies heat energy to the fuel reformer and CO remover. The CO remover includes a water gas shift unit (24) and a selective oxidation unit (26). An INDEPENDENT CLAIM is included for a fuel cell system comprising the fuel reforming system, a supplying source (10) to supply a fuel containing hydrogen, and an electric generator to generate electricity by an electrochemical reaction between the reformed gas and an oxidant.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a fuel cell system having a fuel reforming system.    fuel supplying source (10)    fuel reforming system (20)    fuel reformer (22)    reforming catalyst (22a)    water gas shift unit (24)    shift catalyst (24a)    selective oxidation unit (26)    oxidation catalyst (26a)    heat source (28)    flame (28a)    air feeder (40)    recovering unit. (50)