Effect on Coal Physicochemical Properties from Added Foreign Chemicals

Coal additives can promote coal burning and improve the utilization of coal, thus effectively saving coal resources. Coal additive was found to improve coal calorific value obviously by the tests of coal calorific value with two kinds additives, the maximum of calorific value could be increased by 19% , which indicated that the additives promoted coal combustion . By comparing the experimental data , when added directly , it was the most efficient to improve combustion heat for the dose group of 1% coal formulations. while immersed added, it was 0.5% dose formulations to improve coal combustion heat the most efficiently. The effect of immersed added was better than that of added directly. Through SEM micrographs analysis of coal sample experiments, surface roughness and angle were outstanding for not added coal additives. There are similar in shape of pulverized coal comparing the direct added additive with not added additive. The morphology of coal samples changed while dipping additives on them, coal was partially eroded , spherical trend , which increased the surface area, it was helpful for burning.