Chování toxických prvků při spalování uhlí

Abstract

This work was focused to the behaviour of 18 minor and trace elements at coal combustion at circulating fluidised-bed power station. Owing to high efficiency of the capture of solid particles in particulate control device there are especially volatilized elements present in flue gas that are the most dangerous for the environment. This is the reason why this work was devoted to the evaluation of the effect of unburned carbon content and the contents of major elements on the toxic minor and trace elements contents in fly ash fractions. It was concluded that with increasing unburned carbon content in ash fraction the contents of Cl, Br, As, Se, Cu, Ni and Sr considerably increased as well; the increase of Ba, Cr, V, Zn, Ge and Y contents was not so significant. S contents increased above all with increasing CaO content and, to a lesser extent, also with Fe2O3 content.