Study on the effect of kaolin on the emission of trace elements during staged-combustion of coal
分级燃烧工况下高岭土对煤中微量元素排放的影响研究

This paper reports the effects of kaolin addition on concentrations and distribution of 18 trace elements (Hg, As, Cd, Pb, Zn, Sb, Sn, Ba, Co, Be, Cr, Ni, Mo, Tl, V, U, Mn, Th) in the fatty coal and anthracite and their burnt products based on a coal combustion experiment in one-dimensional coal-fired furnace. The Coefficients of adsorptions of each trace element on kaolin during air-staged combustion were calculated. The results showed that kaolin had a different adsorptive capacity to different trace elements, especially for those with medium and low volatile trace elements. Experimental results indicated that adsorptive capacity was related to the types of coal, trace element, combustion temperature, the content of carbon in fly ashes, and anthracite combustion is better than fatty coal combustion.