Abstract
The chemical reaction between sorbent particles and sulfur dioxide (SO2) is used to remove SO2 from stack gases. The addition of powdered limestone to coal in the fluidized bed coal combustor generates calcium oxide (CaO) which reacts with the SO2 to form CaSO3 at low temperatures and CaSO4 at temperatures above 700 K. The utilization of the limestone is known to be low (about 20%) because the pores of the CaO plug as the product forms. This research was conducted to examine the reaction between CaO and SO2 to elucidate the rate-controlling processes, to generate CaO particles with a more open pore structure, and to develop techniques for single particle measurements at elevated temperatures.
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