Particulate injection burner
AssigneeThe BOC Group, Inc.
InventorChristian J. Feldermann
Life of this patent
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Abstract
A burner has a body portion and a main outlet. Fuel and primary oxidant outlets are arranged upstream of the main outlet and are disposed substantially concentrically about the axis of the burner. A chamber inside the body portion provides a place for the mixing of the fuel and oxidant. A laval nozzle provides acceleration of the mixed fuel and oxidant. Particulate matter are injected into a secondary oxidant flow immediately adjacent and downstream of the accelerating nozzle. The burner can be used in an electric arc furnace for decarburization of metals as well as post combustion. The burner can be mounted in a water-cooled box and can be fitted with an oxygen port for extra oxygen for post combustion while the burner injects hot oxygen and carbon for slag forming.
Claims13
A burner comprising:
- a body portion having a longitudinal axis;
- the body portion having a main outlet, fuel and primary oxidant outlets upstream of said main outlet and disposed substantially concentrically about the longitudinal axis, a chamber within the body portion for receiving and mixing said fuel and primary oxidant to produce a mixture, means downstream of said chamber for accelerating said mixture of fuel and oxidant towards and out of said main outlet for combustion;
- and
- means for discharging particulate matter entrained in a secondary oxidant into the flow of accelerated fuel and primary oxidant immediately adjacent and downstream of said accelerating means, the discharging means being substantially coaxial with the longitudinal axis and the accelerating means being concentrically disposed around the discharging means.
A method of operating a burner comprising the steps of accelerating a mixture of fuel and a primary oxidant towards and out of a main outlet of a burner body of the burner for combustion;
- discharging particulate matter being entrained in a secondary oxidant into said mixture at a position adjacent and downstream to the accelerating flow of fuel and primary oxidant;
- and drawing said oxidant-entrained particulate matter into the flow of fuel and primary oxidant;
- wherein the primary oxidant is discharged from the burner at supersonic speed and the particulate matter includes droplets of liquid entraining solid material.
Dependencies are inferred from the claim text.