NOVELTY - A fuel reforming apparatus (20) comprises a burner, reforming reactor, evaporator, and air spraying unit (70). The burner sprays a flame by burning a fuel together with air. The reforming reactor receives thermal energy from the flame and generates a reformed gas through a reforming reaction between the fuel and steam. A pipeline allows the fuel and water to flow. The pipeline is disposed in the evaporator. The pipeline discharge fuel and water in a direction of the flame sprayed from the burner.    USE - The fuel reforming apparatus is useful for generating a reformed gas containing hydrogen used as fuel for fuel cell system.    ADVANTAGE - The apparatus achieves optimal operation performance only when the thermal energy in the temperature range corresponding to the specific operational temperature is supplied to the reformer and evaporator, allows controlling thermal energy transferred from the burner to the reformer and evaporator to maximize the thermal efficiency, and operational efficiency of the fuel reforming apparatus. The apparatus improves reaction efficiency and thermal efficiency, is capable of maximizing thermal efficiency and operational efficiency by controlling thermal energy needed for operation.    DETAILED DESCRIPTION - The water is evaporated by the flame to produce the steam. The fuel and steam are supplied to the reforming reactor. The air spraying unit is adapted to spray additional air into the evaporator. A liquefied gaseous fuel comprises butane as the fuel is used in the apparatus. The evaporator is made with path having a shape of a pipeline. The path is wound in a helical coiled shape to form an inner space and is connected to the reforming reactor. The reforming reactor is connected to supply the reformed gas to a fuel cell body in which electrical energy is generated through a reaction between hydrogen and oxygen. An air spraying unit is connected to a non-reacted reformed gas outlet of the fuel cell body. An INDEPENDENT CLAIM is included for fuel cell system (100). The burner is made with torch connected to an end portion of the second pipe to ignite and burn the gaseous phase fuel together with air. The fuel cell body is electricity generator (11) made with membrane electrode assembly (MEA) and separators disposed on both sides of the MEA. The fuel cell body is constructed with a non-reacted reformed gas outlet for discharging the reformed gas which remains after a reaction in the electricity generators. The non-reacted reformed gas outlet is connected to the air spraying unit.    DESCRIPTION OF DRAWING(S) - The figure shows schematic diagram of fuel cell system.    Electricity generator (11)    Fuel reforming apparatus (20)    Fuel tank (50, 51)    Water tank (61)    Air spraying unit (70)    Fuel cell system (100)