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US 5,308,239 AGranted
Method for reducing NOx production during air-fuel combustion processes
AssigneeAir Products and Chemicals, Inc.
InventorsEdward R. Bazarian, James F. Heffron, Charles E. Baukal, Jr.
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Abstract
Oxy-fuel combustion combined with air-fuel combustion to increase productivity of the combustion process and reduce nitrogen oxides in the products of combustion by maintaining fuel rich oxy-fuel combustion while combusting the air-fuel as close as possible at stoichiometric conditions.
Claims10
A method of reducing nitrogen oxide levels produced during the combustion of an air-fuel mixture comprising the steps of:
- (a) combusting an oxy-fuel mixture inside an envelope of air-fuel combustion to shield the oxy-fuel combustion from nitrogen during combustion;
- (b) maintaining the oxy-fuel mixture in a fuel rich condition during the entire combustion process;
- and
- (c) maintaining combustion of the air-fuel mixture at conditions dictated by stoichiometry or slightly fuel-lean.
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Dependencies are inferred from the claim text.