MATHEMATICAL-MODELING OF A ROTARY SWIRL CYCLONE SCRUBBER

Rotary Swirl Cyclone Scrubber (RSCS) is a device designed to remove SO 2 and ash from the combustion products of an entrained-flow gasifier. It uses a combination of highly swirling how and water sprays to produ ce high heat and mass transfer rates. In order to develop a better und erstanding of the operation of this device, modelling has been perform ed using an extended version of CFX-F3D. Simulations have been perform ed to examine the flowfield in the device and to determine SO2 and ash capture efficiencies. The simulations show that the water jets used t o remove the SO2 from the gas completely change the direction of swirl in the device, resulting in a highly turbulent flow. The experimental SO2 capture efficiency and the outlet temperature are well reproduced using a water droplet size of 60 mu m, with this value being determin ed via fitting to a particular experiment. Predictions of ash particle capture are found to be in good agreement with the experimental data.