Process and apparatus for enhancing distribution of nox...

Details Process and apparatus for enhancing distribution of nox... Process and apparatus for enhancing distribution of nox...

B - Operations, Transporting

01

D

B01D 53/56 (2006.01)

Patent

CA 2161135

Reduction of nitrogen oxides emissions from large scale combus- tors, such as coal-fired boilers and incinerators which produce effluents with high solids concentrations, is improved. High solids loading and other operational factors can cause such large temperature gradients trans- verse to the direction of effluent flow the SNCR cannot be practiced in fashion. The process entails defining a near-wall zone having a temperature effective for SNCR and a central zone where the tempera- ture is too high. NOx-reducing composition is introduced into the effluent within the near-wall zone in fine droplets (30 and 130) and can be intro- duced into the central zone after the gas has cooled or as large droplets effective to survive the high temperature.

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