Keywords: fluidised beds, lime slurry, sulphur dioxide absorption, TCA, turbulent contact absorbers, mathematical modelling, flue-gas desulphurisation, flue gases, eddy viscosity, eddy diffusivity, partial differential equations, PDE, mass transfer, moving boundaries
Mathematical modelling of flue-gas desulphurisation using lime slurry in a turbulent contact absorber
A mathematical model has been developed for absorption of SO2 from flue gases using lime slurry in Turbulent Contact Absorbers (TCA). In this model, the TCA was simulated by considering it as a falling film absorption system. Turbulent effects were taken into account by using eddy viscosity and eddy diffusivity. The system of partial differential equations of mass transfer with moving boundaries was solved numerically in order to obtain the concentration profiles of the reactants, the thickness of the reaction zone and the outlet gas concentration. A bench-scale TCA was built up, and the mathematical model was evaluated against experimental data obtained from the built device. The model predictions showed good agreement with the experimental data and literature data.