On the SO2 problem of solid fuel combustion

Many companies use two-phase absorbents (CaCO₃ suspension) for waste gases purification from SO₂. A qualitative theoretical analysis of the absorption kinetics in the cases of two-phase absorbent, using the convection-diffusion type of model, is presented. It is shown that the low CaCO₃ concentration lead to very small chemical reaction rate and as a result the absorption rate is limited by the physical absorption of SO₂ in water, i.e. the process efficiency is very small. An average concentration model for quantitative analysis of the absorption process and an iterative numerical algorithm for the model equations solution is proposed.