Известия Томского политехнического университета: Инжиниринг георесурсов (Dec 2016)
Mass transfer efficiency of shock-spray packing
Abstract
Relevance of the work is caused by the need to intensify mass transfer in gas-liquid systems for reducing the dimensions of industrial apparatus and decreasing harmful emissions into the environment. The main aim of the study is to determine experimentally the volumetric coefficient of mass transfer in carbon dioxide desorption from water into the air stream on a new shock-spray packing at different relative gas velocity and irrigation density and to compare the efficiency of the shock-spray packing with the known ones based on the experimental data obtained. The methods used in the study: experimental determination of the volumetric coefficients of mass transfer using the material balance and mass transfer equations, direct titration, instrumental definition of gas and liquid flow rates. The results. The authors have obtained the experimental data base on the volumetric coefficients of mass transfer at carbon dioxide desorption from water in a wide range of superficial gas velocities and irrigation densities in the new regular shock-spray packing. It was found out that the dependence of the volumetric mass transfer coefficient in the shock-spray packing on irrigation density is extreme. The appearance of maxima is explained by the properties of arising hydrodynamic regimes, which provide the developed surface of phase contact and high intensity of mass transfer. It is shown that, depending on the irrigation density and superficial gas velocity on the shock-spray packing four hydrodynamic regimes: jet, spray, shock-spray and flooding, occur. It was shown that when the gas superficial velocity is 1,21-1,56 m/s the volumetric mass transfer coefficient in the shock-spray packing exceeds in 2,49-3,33 times the volumetric mass transfer coefficient on the packing GIAP H3 (equivalent diameter de=0,038 m). This fact is explained by hydrodynamic regime in the new packing shock-spray. It is shown that the new shock-spray packing is prospective for gas-liquid processes in chemical industry.
