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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 SO 2 emission. The coke pellets were combusted between 700°C and 1 300°C under pure oxygen atmosphere. Combustion kinetics and conversion data of SO 2 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 SO 2 emission below 900°C by adding lime/limestone to coke. However, the reduction efficiency of SO 2 by the addition of lime/limestone decreased with increasing temperature due to the decomposition reaction of CaSO 4 . The variation of the conversion to NO and SO 2 with the combustion conditions during the combustion of coke pellet was compared with the results of thermodynamic calculation.

Influence of Lime/Limestone Addition on the SO2 and NO Formation during the Combustion of Coke Pellet