Raw fuel vaporizing apparatus, method of vaporizing raw fuel, and fuel cell system equipped with raw fuel vaporizing apparatus

A method of vaporizing raw fuel, wherein high temperature gas generated in a catalyst combustor into which fuel and air are introduced for catalytic combustion is introduced into a vaporizer so as to vaporize liquid raw fuel introduced into the vaporizer, the method comprising:

• continuously introducing part of or the whole remaining gas vaporized in the vaporizer and reformed but unused in hydrogen utilizing equipment into the catalyst combustor as the fuel;
• and
• increasing the amount of the high temperature gas by increasing the amount of the air to be introduced into the catalyst combustor if a demand amount of vapor to be generated in the vaporizer is increased.

A method of vaporizing raw fuel, wherein high temperature gas generated in a catalyst combustor into which fuel and air are supplied for catalytic combustion is introduced into a vaporizer so as to vaporize liquid raw fuel introduced into the vaporizer, the method comprising:

• increasing the amount of the high temperature gas by increasing the amount of the air to be introduced into the catalyst combustor when a demand amount of raw fuel vapor to be generated by vaporizing the liquid raw fuel is increased and if increasing the introduction of the fuel into the catalyst combustor is delayed against the increased amount of the raw fuel introduced into the vaporizer.