4649033 Process to eliminate air pollutants which result from the combustion of fuels containing sulphur

Abstract

Process to eliminate air pollutants which result from the combustion (1) of fuels containing sulphur, permitting the transformation of substantially all the existing SO2 and SO3 produced by the combustion of fuels, to Ammonium Sulphate. In accordance with an accomplishment of this invention, a quantity (1o) of gaseous Ammonia, sufficient to react with all the SO2 and SO3, is injected into the combustion gases when these are at a temperature range of 250oC to 600oC, these gases being subsequently cooled down to temperatures below 65oC, and then subjected to separation means to extract the submicron and micra sized particles (6, 7, 8), before being released to the atmosphere. In another accomplishment, a first injection (1o) of Ammonia is made into the 250oC to 600oC combustion gases in a quantity sufficient to fully react with the existing SO3, and a second Ammonia injection (2o) is made with the combustion gases at a 65oC to 250oC range, and in a quantity sufficient to react with all the existing SO2 or, if desired, with part of it.