Utilization of Estonian Oil Shale at Power Plants
Estonian oil shale belongs to the carbonate class and is characterized as a solid fuel with very high mineral matter content (60–70% in dry mass), moderate moisture content (9–12%) and low heating value (LHV 8–10 MJ/kg).
Estonian oil shale deposits lie in layers interlacing mineral stratas. The main constituent in mineral stratas is limestone. Organic matter is joined with sandy-clay minerals in shale layers.
Estonian oil shale at power plants with total capacity of 3060 MWe is utilized in pulverized form. Oil shale utilization as fuel, with high calcium oxide and alkali metal content, at power plants is connected with intensive fouling, high temperature corrosion and wear of steam boiler’s heat transfer surfaces.
Utilization of Estonian oil shale is also associated with ash residue use in national economy and as absorbent for flue gas desulphurization system.
KeywordsCalcium Oxide Heat Transfer Surface High Temperature Corrosion Clinker Mineral Free Calcium Oxide
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