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Doichinova, M.
- On the SO2 Problem in Thermal Power Plants. 1. Absorption Processes Modeling
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Authors
Affiliations
1 Institute of Chemical Engineering, Bulgarian Academy of Sciences, “Acad. St. Angelov Str., Bl. 103, 1113 Sofia, BG
1 Institute of Chemical Engineering, Bulgarian Academy of Sciences, “Acad. St. Angelov Str., Bl. 103, 1113 Sofia, BG
Source
International Journal of Engineering Research, Vol 4, No 10 (2015), Pagination: 550-556Abstract
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.Keywords
Gas Purification, Physical Absorption, Chemical Absorption, Two-Phase Absorbent, Mass Transfer Resistance, Convection-Diffusion Model, Average Concentration Model.Full Text
- On the SO2 Problem in Thermal Power Plants. 2.Two-Steps Chemical Absorption Modeling
Abstract Views :152 |
PDF Views:0
Authors
Affiliations
1 Institute of Chemical Engineering, Bulgarian Academy of Sciences, “Acad. St. Angelov Str., Bl. 103, 1113 Sofia, BG
1 Institute of Chemical Engineering, Bulgarian Academy of Sciences, “Acad. St. Angelov Str., Bl. 103, 1113 Sofia, BG
Source
International Journal of Engineering Research, Vol 4, No 10 (2015), Pagination: 557-561Abstract
The modeling of the gas absorption in a new column apparatus for waste gases purification from SО2, using two phase 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.Keywords
Absorption, Gas Purification, Two-Phase Absorbent Method, Three-Zone Column, Convection-Diffusion Model, Average Concentration Model.Full Text