Study of slagging and fouling mechanisms in a lignite-fired power plant

A significant proportion of the electrical power requirements of Greece are covered by lignite-fired power plants. Greek lignite is characterized by a high water and ash content and a low heating value. Slagging and fouling are common inside the power units and severely affect the performance of the power plants (reduced efficiency, steam leakage in the superheaters and water walls whereas the high temperature of the exhaust gases leads to the mal-functioning of the electrostatic filters). In addition excessive interior pollution cause the units to stop for cleaning resulting in a reduced production and increased maintenance costs.