Comparison of Sulfur Dioxide Removal Reactions Kinetics by Na2CO3 and Other Different Sorbents from Coal-fired Power Plants

Abstract

This work deals with kinetic parameters estimation of Na 2 CO 3 +SO 2 reaction em-ploying sophisticated random pore model. The temperature of experiments ranges from 100 to 250 °C, and various SO 2 concentrations are within 0.13–1.12 vol.%. According to the results, the reaction rate concentration dependency follows the fractional function. The values of rate constants and product layer diffusivities are expressed at various temperatures. Finally, it was attempted to describe the significance of this sorbent for SO 2 removal. Therefore, the kinetic results of Na 2 CO 3 +SO 2 reaction were compared with other similar studies on SO 2 reaction kinetics with CaO, CuO, and MgO sorbents. It was concluded that Na 2 CO 3 shows advantages of higher rate constants, lower operating temperatures, and less possibility of incomplete conversion problem. The reported kinetic constants are essential for design of flue gas desulfurization reactors, especially in coal-fired power plants.