2004 Volume 44 Issue 3 Pages 470-475
Isothermal combustion experiments of coke pellet mixed with lime/limestone had been performed to investigate the effect of lime/limestone addition on the reduction of NO and SO2 emission. The coke pellets were combusted between 700°C and 1300°C under pure oxygen atmosphere. Combustion kinetics and conversion data of SO2 and NO were obtained from the thermogravimetry of coke pellet and gas analysis data. Adsorption of NO by lime mixed with coke was not occurred in the experimental ranges. It was possible to reduce most of SO2 emission below 900°C by adding lime/limestone to coke. However, the reduction efficiency of SO2 by the addition of lime/limestone decreased with increasing temperature due to the decomposition reaction of CaSO4. The variation of the conversion to NO and SO2 with the combustion conditions during the combustion of coke pellet was compared with the results of thermodynamic calculation.