Fluidized-Bed Coal Combustion with Lime Additives. The Phenomenon of Peaking of Sulfur Retention at a Certain Temperature

Preliminary kinetic results and the mechanistic implications of the reactions between calcium sulfate and coal ash are presented. Calcium silicates were identified in the reaction products. These reactions also produce SO₂ and have been shown to have a high temperature dependency. Taken with the published kinetic data on the sulfation reaction of limestone, this leads to a possible contributory mechanism toward the phenomenon of peaking of sulfur retention at a certain temperature in fluidized-bed coal combustion with lime additives.