16. The release behavior of trace elements from coal during high temperature process

Abstract

Four kinds of coal samples whose Cl-contents vary from 30ppm to 300ppm were pyrolyzed and burned, and the release behavior of Zn was examined. In the coal pyrolysis step, as the increase of Cl contents in coal, the release amounts of Zn also increased. It was considered that the generation of ZnCl2 was one reason for Zn emission. In the coal combustion, a part of Zn was released as ZnCl2 and the other part was remained in the ash as non-volatile ZnO, because some of Zn in the coal was reacted with Cl and others were oxidized during volatilization.