In a wetted-wall column of pilot-scale sulphur dioxide removal efficiencies were measured at 20
and atmospheric pressure with aqueous ammonia solutions. The liquid-phase mass transfer coefficient and gas-phase mass transfer coefficients of the system were determined. Based on the classical two-film theory the mathematical model was built to describe the complex absorption process. Combined with the valuation of the model parameters and the appropriate boundary conditions the model equations were solved and got the concentration distribution of each component in the liquid film and pH value, gas partial pressure and enhancement factor of distribution along the tower. Compared experimental results with the initial concentration of desulfurization efficiency. The results show that the numerical results were in good agreement with experimental results