Keywords: mass transfer, structured packing, absorption, sulphur dioxide removal, exhaust gases, hydrocarbon combustion, hydrodynamics, hydrodynamic modelling
Removal of sulphur dioxide from exhaust gases using hazardous and structured packing
The expulsion of sulphur dioxide from hydrocarbon combustion can reach levels higher than accepted by the normative. In order to evaluate the efficiency of separation of SO2 by different packing systems constructed with materials such as metals or ceramics, the mass transfer and hydrodynamic parameters were evaluated. With the use of mass transfer model, the ININ packing showed higher separation efficiency with respect to Sulzer BX, Mellapak, and Raschig packing: 33.74%, 45.43% and 61.32%, respectively. These results were because the ININ packing has lower corrugation angles and narrower corrugated side than the others. The present work quantifies the improvements in mass transfer, like mass transfer volumetric coefficient and the height of the transfer global units in gas and liquid phase per each packing, using absorption columns with different gas flow managed: 5,000, 4,000 and 3,000 Nm³/h. The hydrodynamic model was used to design the column, as well as to determine the diameter or the cross area of the column per each packing. It is discussed that the ININ packing was one of the best of those tested because it has the highest separation efficiency with the least height of the transfer global units.