On the SO2 Problem in Thermal Power Plants. 2.Two-steps chemical absorption modeling
Journal: International Journal of Engineering Research (IJER) (Vol.4, No. 10)Publication Date: 2015-10-01
Authors : Chr. Boyadjiev; P. Popova-Krumova; M. Doichinova; B. Boyadjiev;
Page : 557-561
Keywords : absorption; gas purification; two-phase absorbent method; three-zone column; convection-diffusion model; average concentration model.;
Abstract
The modeling of the gas absorption in a new column apparatus for waste gases purification from SО2, using twophase absorbent (CaCO3 / H2O suspension) is presented. The process is realized in a three-zone column. In the upper zone a physical absorption in gas-liquid drops system is realized and the big convective transfer in the gas phase leads to a decrease of the mass transfer resistances in this phase. In the middle zone a chemical absorption in liquid-gas bubbles system takes place and the big convective transfer in the liquid phase leads to a decrease of the mass transfer resistances in this phase. The large volume of the liquid in the middle zone causes an increase of the chemical reaction time and as a result a further decrease of the mass transfer resistances in the liquid phases is realized. The third zone is the column tank, where the chemical reaction takes place only.
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Last modified: 2015-11-17 13:52:17