Burning and physico-chemical characteristics of carbon in ash from a coal fired power plant

Results showed the existence of marked differences in the content of both carbon and inorganic elements according to the row of EP and the granulometric size of the samples. In contrast with this, the combustion reactivity of all ash samples was similar regardless of their collection point and particle size. Ash reactivity resulted to be approximately 100 times lower than that of the parent coal.

The paper addresses the relationship between the chemico-physical properties and the residual combustion reactivity of fly ashes from a full-scale front fired PF coal boiler. Ashes collected at different rows of electrostatic precipitators (EP) have been characterized for their particle size distribution, morphology, chemical composition and combustion reactivity. The combustion time of carbon in ash has been estimated for a wide range of temperatures using a thermobalance and a heated strip reactor.