Research on coal combustion catalysts for cement kiln via comprehensive evaluation method based on combustion characteristics

Abstract

Thermogravimetric-differential thermal analysis (TG-DSC) has been used to obtain information on combustion characteristics of bituminous coal and anthracite incorporating Cu(NO3)2, KNO3, ZnO and MnO2, and the apparent kinetic parameters were determined by the first-order Coats & Redfern method based on the TG-DSC results. Experiments were conducted from the 303 K–1172 K at heating rate of 10 K min−1. The ignition index, burning intensity, burnout index and activation energy were used as evaluation indexes. The weight of evaluation indexes was given by relative comparison method, The catalyst activity was evaluated by linear weighted synthesis method. It was indicated that those of bituminous coal and anthracite, the relative active sequence of catalysts to the comprehensive combustion performance of bituminous coal could be described as follows: Cu(NO3)2>KNO3>ZnO > MnO2. The relative active sequence of catalysts to the comprehensive combustion performance of anthracite could be described as follows: Cu(NO3)2>ZnO > MnO2>KNO3.