Desulfurization Characteristics of Domestic Limestones through Simultaneous Calcination and Desulfurization Reaction

In order to analyze and compare the desulfurization characteristics of five different kinds of domestic limestons, a thermogravi- metric analyzer (TGA) was used in this study. Calcium carbonate contents of the domestic limestone varied from 91 to 96 wt%. Experimental temperature and sulfur dioxide concentration of 850 ℃ and 2,750 ppm, respectively were selected to simu- late commercial operation conditions. In this study, the calcination and desulfurization reaction of limestones were simulta- neously occurred and investigated to simulate in-situ desulfurization reaction in commercial circulating fluidized bed combustors. In addition, desulfurization reactivities of limes having the average particle sizes of 37.5, 90.5, 159, 356 and 750 µm were investigated. Desulfurization reactivities via simultaneous calcination and desulfurization reactions were 5-20% lower than those of using general desulfurization reactions.