Method and system for controlling pollutant emissions in combust

Details Method and system for controlling pollutant emissions in combust Method and system for controlling pollutant emissions in combust

1994-03-16

1996-12-24

Gromada, Denise L.

Furnaces

Process

Treating fuel constituent or combustion product

110238, 110344, 110215, 422168, F23J 1100

Patent

active

055865100

ABSTRACT:
The present invention relates to methods and systems for reducing pollutant emissions associated with combustion operations, e.g., cement manufacturing. The invention further relates to the disposal of sludge, e.g., produced by waste water treatment plants, by introducing it into the combustion process. In particular, the invention provides for introducing particles of aqueous sludge into a kiln at a point in the kiln effective to reduce pollutant emissions in outlet flue gasses produced by the kiln. Optimally, the sludge is introduced at a point in which maximum NO.sub.x emission reductions can occur and maximum HCl emission reductions can occur downstream (at lower temperatures). In a specific embodiment, introduction of about 10 to about 20 tons per hour of wet sludge results in about a 15% to 30% reduction in NO.sub.x emissions in a cement kiln.

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