2001 Volume 80 Issue 8 Pages 758-764
SO2 capture by limestone was conducted within a 71MWe pressu-rized fluidized bed combustor. Mixtures of high-sulfur petroleum coke and low-sulfur coal with different mixing proportion were used as fuels. The effect of the size distribu-tion of limestone on SO2 removal efficiency was evaluated. The SO2 removal efficiency was well correlated with feed rate of external surface area of limestone greater than the cut size of cyclone that recycled elutriated fine particle into the bed. A semi-theoretical correlation between size distribution of fed limestone and SO2 removal efficiency was proposed. This model assumed the uniform formation of SO2 in the dense bed, SO2 cap-ture in the dense bed by fresh limestone of fractions greater than elutriation size, and SO2 capture in the freeboard by fresh limestone of fractions smaller than the elutriation size but greater than the cyclone cut size.
