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The Thermal Properties Model of Supercritical Carbon Dioxide

Author: FuChang
Tutor: WuDaKe
School: Guizhou University
Course: Chemical processes
Keywords: supercritical carbon dioxide thermal properties model parameters optimization genetic algorithm
CLC: O642
Type: Master's thesis
Year: 2006
Downloads: 315
Quote: 1
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Abstract


The thermal properties of supercritical carbon dioxide（SCF CO2） is the essential basic-data which the SCFE industrial equipments design and simulate.The AAD which caculated from EOS and it’s enduce model is greater.So creat the new model is necessary.This thesis proposed a new fit equation with two variables for compressibility factor data of supercritical carbon dioxide.There are no undertermined coefficients in the new equation. Parameters of the equation were optimized by using the genetic algorithm.Within wide range of temperature and pressure,the AAD of supercritical carbon dioxide’s compressibility factor data is 1.23%.With the new equation,this work educed the estimation models of enthalpy, heat capacity, Joule-Thomson coefficient for SCF CO2.Combining the new equation with Dean-Stiel viscosity model.built the viscosity model of SCF CO2. Combining the new equation with contrastive density model,built the density model of SCF CO2.The AAD for these models sequentially are as follow: enthalpy 3.71%, heat capacity 7.18%, Joule-Thomson coefficient 7.11%, viscosity 4.20%, thermal conductivity 5.63%.Compare with the equation of SRK, use the same approach to educe or modified these models, the each model of AAD is: 12.05 %,12.13 %,13.15 %,6.20%,9.54 %.The results shows that the new equation proposed obviously surpasses the equation of SRK.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical thermodynamics, thermochemistry, thermodynamic equilibrium
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