US 5,700,143 AGranted

Combination burner with primary and secondary fuel injection

AssigneeHauck Manufacturing Company

InventorsBruce C. Irwin, Edward E. Moore, Raymond F. Baum

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Abstract

A combination burner which uses primary and secondary fuel injection and improves liquid propane combustion. The burner supplies primary air, while secondary air is swirled to shape and mix the flame when the burner is firing "on oil". When the burner is firing "on gas", primary air enters the burner through an annulus at the atomizing air pipe or conduit so as to have the primary gas enter that pipe; secondary gas is injected radially into the air stream at a downstream location relative to an atomizing nozzle. In using liquid propane (butane) to fire the burner, two stage fuel injection is used, with a stream of fuel being injected upstream and toward the burner centerline and another stream of fuel being injected downstream and outwardly away from the burner centerline.

Claims9

Dependent claims

A combination burner, comprising

a primary air supply conduit having a central axis;
an atomizing nozzle operatively arranged inside the primary air supply conduit;
a secondary swirl air supply conduit arranged to permit secondary swirl air to exit past the atomizing nozzle and to shape a flame;
an annulus defined, in part, by the primary air supply conduit for selectively injecting primary gas into the secondary swirl air conduit when the burner is in a gas firing state;
a tertiary air supply conduit surrounding and partially defined by the secondary swirl air conduit for providing swirling tertiary air flow;
means for selectively supplying oil to the atomizing nozzle when the burner is in an oil firing state;
secondary gas supply nozzles for injecting secondary gas radially inwardly toward a centerline of the burner in the gas firing state to form a secondary gas flame stability zone;
injectors arranged selectively in relation to the secondary swirl air supply conduit to inject two streams of fuel, the first of the two streams converging toward the central axis of the primary air supply conduit as viewed in an upstream direction in the secondary swirl air conduit and the second of two streams diverging away from the central axis in a downstream direction in the secondary swirl air conduit with the burner in a firing state for firing the two streams of fuel;
and means for selectively swirling the second of the two streams.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/439,944Filed 12 May 1995 · continuation in part
Priority: 24 Jan 1994
Granted: 23 Dec 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F23D 17/002
Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel: gaseous or liquid fuel
F23C 2202/40
Fluegas recirculation: inducing local whirls around flame
F23D
Burners
F23C
Methods or apparatus for combustion using fluid fuel or solid fuel suspended

Family

Serial188,406Parent of this continuation-in-part · filed 24 Jan 1994
US 5,511,970 AParent of this continuation-in-part · filed 30 Apr 1996
US 5,700,143 AThis patent

From the US filing history. Foreign family members aren’t listed.

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