Study on the influence of light-burnt dolomite/Fe2O3/CeO2 composite combustion aid on the enhanced combustion characteristics of pulverized coal

Abstract

ABSTRACT To enhance the performance of pulverized coal combustion, a composite combustion aid was prepared by the physical mixing method using the preferred coal blend of a particular enterprise as the raw material. The effects of different proportions of composite combustion aids (light-burnt dolomite (LBD), Fe2O3, and CeO2) on the catalytic combustion reactivity of pulverized coal were studied using a synchronous thermal analyzer, and the enhanced combustion characteristics, kinetic parameters, and thermal release characteristics of the composite combustion aids on pulverized coal were examined. The results showed that the composite combustion aids with different ratios had different combustion-enhancing effects on pulverized coal; the composite combustion aid consisting of LBD, Fe2O3, and CeO2 in a specific ratio could reduce the ignition temperature of pulverized coal by 1.94%, the maximum weight loss temperature by 0.71%, the burn-out temperature by 0.15%, the integrated combustion index by 15.31%, the mass loss by 87.15%, and it appeared in the combustion stage; the activation energy decreased by 8.2%; the exothermic capacity increased by 12.90%. By comparing the ratio content of the composite combustion aid in terms of its effect on the combustion of coal powder, the best catalytic effect was achieved with a ratio of LBD, Fe2O3, and CeO2 of 7:2:1. The research results obtained the optimal catalytic effect of the composite combustion aid, which provides a theoretical reference for the industrial application of catalysts added to blast furnace blowing pulverized coal.