Method for homogenizing the heat distribution as well as decreasing the amount of NO.sub.x
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United States of America Patent
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Dec 13, 2011
Grant Date -
Sep 23, 2010
app pub date -
Mar 22, 2010
filing date -
Mar 20, 2009
priority date (Note) -
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Abstract
in 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.
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