A raw fuel vaporizing apparatus comprising: a vaporizer for vaporizing liquid
raw
fuel; a raw fuel introducing device for introducing the liquid raw fuel into the
vaporizer; a catalyst combustor into which fuel and air are supplied for catalytic
combustion, the catalyst combustor generating heat in the presence of a catalyst
and supplying the resulting heat to the vaporizer to vaporize the liquid raw fuel;
a fuel introducing device for introducing the fuel into the catalyst combustor;
an air introducing device for introducing the amount of the air suitable for catalytic
combustion into the catalyst combustor; a heat transferring gas introducing device
introducing heat transferring gas into the catalyst combustor to transfer heat
retained by the catalyst combustor to the vaporizer; and a controller increasing
the amount of the heat transferring gas through the heat transferring gas introducing
device when the amount of vapor generated in the vaporizer is increased.
