To provide combustion equipment for avoiding a temperature drop in combustion gas by properly burning high concentration hydrogen gas by a little secondary combustion air quantity by efficiently mixing secondary combustion air in the high concentration hydrogen gas.
A raw fuel gas passage 34 and an offgas passage 36 are independently formed in the combustion equipment 14. A primary combustion air passage 38 is communicated with the raw fuel gas passage 34, and primary combustion air take in by a fan 30 is excessively supplied and premixed. The primary combustion air passage 38 is not communicated with offgas, and the primary combustion air is not actively supplied. Mixed gas of the raw fuel gas and air contacts with the offgas on the downstream side of a burner 32, and at this time, the air of quantity insufficient for combustion of the offgas is compensated by a surplus quantity of the primary combustion air supplied to raw fuel gas. The offgas can be excellently burnt by the little secondary combustion air, and the temperature drop in the combustion gas can be avoided.
COPYRIGHT: (C)2004,JPO&NCIPI
Akio Tanaka
Yoshihiko Takasu
Tsutomu Sobue
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