Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone
Reexamination Certificate
2010-03-22
2011-12-13
Basichas, Alfred (Department: 3743)
Combustion
Process of combustion or burner operation
Flame shaping, or distributing components in combustion zone
C431S008000, C431S012000
Reexamination Certificate
active
08075303
ABSTRACT:
Method for homogenizing the heat distribution as well as decreasing the amount of NOxin combustion products when operating an industrial furnace with at least one conventional burner using air as an oxidant. An additional oxidant including at least 50% oxygen gas is caused to stream into the furnace through a lance. The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner. Firstly, the combination of at least 40% of the supplied oxygen is supplied through the additional oxidant, the lance is arranged at a distance from the air burner of at least 0.3 meters, and the additional oxidant streams into the furnace through the lance with at least sonic velocity, and secondly the additional oxidant is supplied only when the air burner is operated at a certain lowest power or at a higher power.
REFERENCES:
patent: 5601425 (1997-02-01), Kobayashi et al.
patent: 6705117 (2004-03-01), Simpson et al.
patent: 2007/0287109 (2007-12-01), Lodin
patent: 0601274 (2001-12-01), None
patent: 2007/126980 (2007-11-01), None
Ekman Tomas
Gartz Mats
Lugnet Anders
Ritzén Ola
AGA AB
Basichas Alfred
Young & Thompson
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