초록 ▼

A low NOx burner for a furnace operating under natural draft in which primary and secondary combustion air are provided to a first burning zone, in which either or both liquid and gaseous fuel can be used. Less than stoichiometric air is supplied in the primary burning zone and tertiary combustion a

A low NOx burner for a furnace operating under natural draft in which primary and secondary combustion air are provided to a first burning zone, in which either or both liquid and gaseous fuel can be used. Less than stoichiometric air is supplied in the primary burning zone and tertiary combustion air is supplied in a second combustion zone downstream from the first combustion zone. The total air supply is over the stoichiometric requirement. Air control means is provided so that a fixed ratio of primary-secondary air/tertiary air is provided for all burning and fuel rate conditions, so as to maintain the less than stoichiometric air supply to the first combustion zone. In addition, water atomization is provided upstream of the first burning zone to provide a burning chemistry which favors the reduction of NOx in the first burning zone.

대표청구항 ▼

A burner for minimal NOx production under varying rates of either liquid and/or gaseous fuel firing, comprising, means defining a centrally disposed primary combustion area having means to selectively supply liquid fuel and air thereto; means defining a secondary combustion area downstream of the pr

A burner for minimal NOx production under varying rates of either liquid and/or gaseous fuel firing, comprising, means defining a centrally disposed primary combustion area having means to selectively supply liquid fuel and air thereto; means defining a secondary combustion area downstream of the primary combustion area, means defining an annular space surrounding the primary combustion area and communicating with said secondary combustion area, and having means to selectively supply gaseous fuel and air thereto; means defining a tertiary combustion area downstream of the secondary combustion area, means defining an annular space surrounding the secondary combustion area and communicating with said tertiary combustion area and means to supply air thereto; and means to simultaneously control the ratio of air to the primary and secondary combustion area relative to the tertiary combustion area.