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Sulfur dioxide reactivity potential of different types of coal fly ash

Sylvia Boycheva

Fly ash (FA) collected in the electrostatic precipitators of the main Thermal Power Plants (TPP) in Bulgaria, burning different types of domestic (lignite and bituminous) and imported (anthracite) coals was studied with respect to its chemical composition and some physical properties. The potential for reaction with SO2 of studied fly ashes in flue gas desulphurization systems was evaluated by empirical criteria, such as total and real alkaline and sulfur capture capacities. The reactivity ofmixtures of FAwith alkaline and alkaline-earth additives in conjunction with the available surface area was also calculated.