C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/353
C01B 21/00 (2006.01) B01D 53/56 (2006.01)
Patent
CA 1255475
REDUCTION OF NITROGEN-BASED POLLUTANTS THROUGH THE USE OF UREA SOLUTIONS CONTAINING OXYGENATED HYDROCARBON SOLVENTS ABSTRACT Disclosed is a process for maintaining low effluent ammonia contents while reducing nitrogen oxides in an effluent from the combustion of a carbonaceous fuel under oxygen-rich conditions which minimize the production of carbon-based pollutants. An aqueous solution of urea and an oxygenated hydrocarbon is injected into an effluent at a temperature above 1600°F, and preferably above 2000°F. The oxygenated hydrocarbon will be employed at a level effective to reduce the levels of free ammonia in the effluent. This is important when burning fuels containing significant sulfur contents because the free ammonia tends to react with the sulfur compounds to produce solid ammonium sulfate and/or bisulfate which can decrease boiler efficiency.
519895
Borden Ladner Gervais Llp
Fuel Tech Inc.
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