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Generalized Analysis of Gasifier Performance using Equilibrium Modeling
Ravikiran, Anapagaddi,Renganathan, Thiruvengadam,Pushpavanam, Subramaniam,Voolapalli, Ravi Kumar,Cho, Young Sang American Chemical Society 2012 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.51 No.4
<P>Thermodynamic modeling of gasification process provides a quick estimate of performance of the gasifier. Most of the earlier work on thermodynamic modeling is restricted to a particular feedstock–gasification agent combination and hence the results cannot be generalized. In the present work, the equilibrium modeling based on Gibb’s free energy minimization approach is used to analyze the performance of gasification of any fuel using oxygen or steam. The performance is analyzed at the carbon boundary point at which the cold gas efficiency is maximum. The gasification temperature, amount of gasification agent required, composition of syngas, and cold gas efficiency are predicted using Aspen Plus. The results are presented as contour plots on Van Krevelen coordinates (<I>H/C</I> vs <I>O/C</I>) and interpreted based on simplified gasification reactions. The performance for different feedstocks represented in Van Krevelen diagram is also analyzed. Finally, advantage of cogasification of feedstocks is highlighted.</P>
Hydrodynamics of co-current downward liquid-liquid system with packing
Swaminathan Samdavid,Thiruvengadam Renganathan,Kamatam Krishnaiah 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1
The effect of packing and its voidage on the hydrodynamic characteristics of co-current downward liquidliquid system (CCDLLS) was studied using water and three different oils (exxsol, kerosene and white oil). Two flow regimes, homogeneously dispersed oil regime and heterogeneously dispersed oil, were observed with the total pressure drop showing a minimum at the regime transition velocity. Depending on the packing, frictional pressure drop either shows a minimum or monotonically increases with water velocity. Low-density oil results in higher holdup and correspondingly higher frictional pressure drop. Higher dispersed phase holdup is obtained by using a low voidage packing. Semi-empirical/empirical equations are proposed to predict the frictional pressure drop and phase holdup.