ON THE KINETICS OF DRY DESULFURIZATION WITH CALCIUM-OXIDE

The kinetics of the reaction between calcium oxide and sulfur dioxide in a gas stream simulating flue gas were studied in a differential, fixed bed reactor. Attention was focused on the influence of certain parameters (exposure time, temperature and particle size) on the degree of sulfation of calcium oxide. Compared with previous research the influence of these parameters was studied within broader ranges. Temperatures in the range 500-950-degrees-C and particle sizes in the range 0.65-2.0 mm were investigated with exposure times up to 1200 s. The experimental results obtained were interpreted by means of the grain model. The kinetic constant and solid diffusivity figures thus obtained were in line with those previously obtained by other researchers but they were less scattered over the wider range studied.