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US 2010/0244337 A1Published application
NOx Suppression Techniques for an Indurating Furnace
OwnerBruce E. Cain, Thomas F. Robertson +1inventors
InventorsBruce E. Cain, Thomas F. Robertson, John J. Nowakowski
Life of this patent
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Abstract
Techniques for suppressing NOx in an indurating furnace include the use of a premix burner, the use of a staged fuel injector structure to enhance fuel lean conditions in the downdraft, and the use of a Venturi mixture structure in the downcomer.
Claims24
An apparatus comprising:
- an indurating furnace structure defining drying, heating, and cooling stations;
- a conveyor to convey pelletized material through the drying, heating and cooling stations;
- a downcomer configured to direct a downdraft toward the heating station;
- and
- a premix burner configured to form premix from fuel gas and combustion air and to inject the premix into the downcomer for combustion of the premix in the downdraft.
2 more elements
An apparatus comprising:
- an indurating furnace structure defining drying, heating, and cooling stations;
- a conveyor to convey pelletized material through the drying, heating and cooling stations;
- a downcomer configured to direct a downdraft toward the heating station;
- a premix burner configured to form premix from fuel gas and combustion air and to inject the premix into the downcomer for combustion of the premix in the downdraft;
- and
- a reactant supply and control system configured to supply fuel gas and combustion air to the premix burner and simultaneously to inject staged fuel gas without combustion air into the downcomer separately from the premix injected by the premix burner.
3 more elements
An apparatus comprising:
- an indurating furnace structure defining drying, heating, and cooling stations;
- a conveyor to convey pelletized material through the drying, heating and cooling stations;
- a downcomer configured to direct a downdraft toward the heating station;
- a burner configured to inject fuel gas and combustion air into the downcomer for combustion in the downdraft;
- a reactant supply and control system configured to supply fuel gas and combustion air to the burner and simultaneously to inject staged fuel gas without combustion air into the downcomer separately from the burner;
- and
- a Venturi mixer structure that has a mixer flow passage and is arranged for the injected fuel gas and combustion air to entrain staged fuel gas into the mixer flow passage.
4 more elements
Dependencies are inferred from the claim text.