Method for baghouse brown plume pollution control

Details Method for baghouse brown plume pollution control Method for baghouse brown plume pollution control

B - Operations, Transporting

01

D

23/348, 23/353

B01D 53/34 (2006.01) B01D 53/60 (2006.01)

Patent

CA 1325709

ABSTRACT Baghouse SOx/NOx pollution control process comprising injecting from 1 to 25% urea or ammonia along with dry, finely divided sodium bicarbonate or Nahcolite, a naturally occurring form of sodium bicarbonate. The process removes both SOx and NOx from the flue gases of utility and industrial plants, incinerators and the like by dry injection into a flue gas duct a sufficient distance upstream of a baghouse to collect spent reagent and additive. The sodium reagent reacts with the SO2 to form sodium sulfate and also removes NOx in the form of NO. The urea or ammonia additive prevents the conversion of NO to NO2 by the sodium reagent, and reduces the concentration of the NO2 in the exit flue gases to below the NO2 brown plume visibility threshold (about 30 ppm NO2, not corrected to 0% O2, depending on ambient conditions). The additive may be used wet (sprayed into the flue gases in a concentrated water solution) or dry.

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