The Influence of Ash Composition on Fouling and Slagging Propensity in a Coal-Fired Power Plant Boiler

摘要

Coal is a very complex fuel due to its chemical and physical properties. The effects of coal combustion behavior, such as fly ash loss on ignition or slagging and fouling, will affect power plant performance, such as boiler efficiency and possible load deviations. The most common causes for slagging and fouling are a low excess of oxygen, high primary airflows, burner damage, poor coal pulverizer conditions, and coal chemistry. This paper addresses the last point, analyzing the influence of the sodium and iron content in coal on fouling and slagging phenomena in pulverized coal boilers. The formation of eutectic mixtures from the different oxides causes a drop in the fusion temperatures in the boiler convective zone.