The wet Flue Gas Desulfurization in the coal-fired power plants has been the most widely used because of
its high SO2 removal efficiency, reliable and low utility consumption. The difficulty in the prediction of
the SO2 removal from flue gas is that the performance of the system is related to a wide range of variables.
In this paper, the SO2 was removed by absorbing and reacting SO2 with limestone slurry, and limestone
scrubbing was accomplished in a spraying reactor. Experimental investigations for effects of different
operating variables on the SO2 removal showed the reasonable process parameters such as the pH value
of the liquid phase, droplet size of the spray and the flow rates of liquid and gas. The removal process was
analyzed using the two-film theory of mass-transfer. Both the liquid and gas side resistances were important,
and the absorption rate was controlled by a combination of both gas-film and liquid-film diffusion
controls. A model of external mass-transfer with the effects of a chemical enhancement factor and sulfite
concentration in the liquid phase was developed for the prediction of the SO2 removal efficiency, and the
calculated values were in reasonable agreement with the experimental values. The study is considered as
the one-dimensional prediction of SO2 removal and low-cost application of limestone slurry for commercial
FGD technology.