On the SO2 Problem in Thermal Power Plants. 1. Absorption processes modeling

A theoretical analysis, of the processes for gas purification from low SO2 concentration in the thermal power plants, is presented. A new approach, for qualitative analysis (convection-diffusion type of model) and quantitative description (average concentration model) of the absorption processes in column apparatuses, is proposed. The theoretical analysis of the physical absorption, chemical absorption and absorption with two-phase absorbent, is shown. The presented theoretical analysis of the methods and apparatuses for waste gases purification from SО2, using two-phase absorbent (CaCO3 suspension), shows, that the process is physical absorption practically and the mass transfer resistances in the gas and liquid phases are 44% and 56% respectively. In these conditions a new patent is proposed, where the process optimization is realized in two-zone column, where the upper zone is physical absorption in gas-liquid drops system and the lower zone is physical absorption in liquid-gas bubbles system. The chemical reaction takes place in the column tank.