PURPOSE: To enable to maintain high combustion efficiency for a long period by passing a fuel pipe through a catalyst filling unit.
CONSTITUTION: A combustion unit has largely two catalyst filling units. The first catalyst filling unit 7 contains a catalyst including mainly Pd, and the second catalyst filling unit uses a catalyst including mainly Pt. Since the thermal insulating flame temperature of mixture gas of fuel and air supplied to this unit is 800W1,200°C, it is 1,200°C or lower even is a combustion occurs, and noble metal catalyst is less deteriorated. Further, since a fuel pipe 9 is passed through the first unit 7, the catalyst heat exchanged from fuel is not overheated, and the temperature drop when fuel is injected in the first catalyst outlet is advantageously less. As a result that the combustion gas and fuel are mixed at the outlet of the first catalyst, it becomes the temperature and fuel density for effectively acting the second catalyst filling unit, thereby preferably performing a combustion.
YAMANAKA CHIKAU
HAYATA TERUNOBU
HIZUKA JIYUNJI
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