NOx, Hg, and SO 2 removal using ammonia

Details NOx, Hg, and SO 2 removal using ammonia NOx, Hg, and SO 2 removal using ammonia

2006-01-31

2006-01-31

Silverman, Stanley S. (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S242100, C423S243060, C423S243110

Reexamination Certificate

active

06991771

ABSTRACT:
A process and apparatus for removing SO2, NO, and NO2from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.

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Lee et al., “The Effect of In Situ Generated Ammonia-Sulfur Aerosols on the Removal of NOx in a Wet ESP”, Aug. 20, 2001, Mega Symposium, Chicago, IL.

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