Mechanism of ash deposit formation, corrosion and sulphur capture by burning calcium and chlorine containing fuels

The paper deals with the behaviour of fuel mineral matter in combustion process. The results are primarily based on research and experience with Estonian oil shale, as a high carbonate, alkali metal and chlorine content fuel. The ECD (extent of carbonates decomposition) in PF (pulverized firing), AFBC (atmospheric fluidized bed combustion) and PFBC (pressurized fluidized bed combustion) conditions was investigated experimentally. The relationship between the heating value of the fuel and CO 2 concentration in the flue gas as a function of the ECD was established. A description of fouling and high-temperature corrosion of heat transfer surfaces is presented.