Przemysl Chemiczny, Vol.92, No.6, 924-927, 2013
Use of additives to bituminous coal for decreasing the SO2 and NOx contents in flue gases from pilot plant with the circulating fluidized bed. Part 2. Addition of limestone and its mixtures with raw sodium bicarbonate
Limestone and its mixts. with raw NaHCO3 (20:80 to 60:40) were added to bituminous coal used as solid fuel for combustion in a pilot plant with circulating bed (0.1 MWt) at 850 degrees C and Ca/S ratio 1:3. The degree of SO2 removal increased with increasing Ca/S ratio up to 54%. The replacing limestone with NaHCO3 resulted initially in increasing the SO2 removal degree up to 66% and then decreasing down to 39% with increasing the NaHCO3 content. The ashes from combustions contained both sulfates and carbonates. The degree of NOx removal decreased also with increasing the NaHCO3 content (from 60 down to 41%).