Influence of Metal Surface Temperature and Coal Quality on Ash Deposition In PC-Fired Boilers

摘要

The six full-scale trials carried out at the Funen, Ensted and Vendsyssel power stations provided valuable information on the types and chemistry of deposits formed on heat transfer surfaces in pulverized coal-fired boilers. Based on the appearance (texture) of the deposits collected on probes during the trials, five distinct textural deposit types have been defined: 1) porous deposit; 2) powder deposit; 3) iron-rich deposit; 4) semifused slag; and 5) fused slag. These five textural deposit types have characteristic chemical compositions and their formation is controlled by various mechanisms.