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The vapor-liquid equilibrium（VLE） properties for the binary and ternary mixtures of CH4,C2H4 and isoC4H10 are of great importance in the recovery of ethylene from mixture containing CH4 and C2H4 with iso-C4H10 as solvent.Hence,Gibbs ensemble Monte Carlo（GEMC） simulations were used to estimate vapor-liquid equilibrium for the binary and ternary mixtures of CH4,C2H4 and iso-C4H10 with the united atom potential NERD model.The selected simulation conditions are based on the experiment in the literature.The results of this work were shown to be in satisfactory agreement with available experimental data and predictions of Peng-Robinson equation of state.The structure of simulated liquid phase is also characterized by radial distribution function（RDF）,which contributes to further understanding of the VLE curve of these systems.RDF is not sensitive to the pressure and temperature range.With the increase of pressure or the decrease of temperature,the molecules tend to gather together. 相似文献
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CFD Analysis of Gas Distributor in Packed Column--Prediction of Gas Flow and Effect of Tower Internals Geometry Structure 总被引：1，自引：0，他引：1
Computational fluid dynamics (CFD) simulations were carried out on the gas flow patterns of twin-tangential annular deflector gas distributor in the absence of liquid flow in a packed column (6.4 m in diameter), and the gas flow field in the column was presented close to reality on the whole. Furthermore, after ame-lioration of this gas distributor frame, turbulence energy and turbulence energy dissipation rate were both decreased greatly.Simulation results showed that the flow pattern and the distribution of gas flow were strongly affected by the column bottom frame; the proper column bottom frame could decrease the flow pressure drop greatly. Multifold factors, such as the column bottom geometry structure and distributor structure which affects the distribution capacity, must be considered. 相似文献
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Computational fluid dynamics (CFD) simulations were carried out on the gas flow patterns of twintangential annular deflector gas distributor in the absence of liquid flow in a packed column (6.4 m in diameter) , and the gas flow field in the column was presented close to reality on the whole. Furthermore, after amelioration of this gas distributor frame, turbulence energy and turbulence energy dissipation rate were both decreased greatly. Simulation results showed that the flow pattern and the distribution of gas flow were strongly affected by the column bottom frame ; the proper column bottom frame could decrease the flow pressure drop greatly. Multifold factors, such as the column bottom geometry structure and distributor structure which affects the distribution capacity, must be considered. 相似文献
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A mathematic model of two-phase flow and a physical model of two-dimensional (2D) vertical section for the plate-type structured packing Mellapak 250.Y were set up and verified. The models were used to study the influence of packing’s surface microstructure on the continuity of liquid film and the amount of liquid holdup. Simulation results show that the round corner shape and micro wavy structure are favorable in remaining the continuity of liquid film and increasing the amount of liquid holdup. The appropriate liquid flow rate was determined by investigating different liquid loadings to obtain an unbroken liquid film on the packing surface. The pressure difference between inlet and outlet for gas phase allowed gas and liquid to flow countercurrently in a 2D computational domain. The direction change of gas flow occurred near the phase interface area. 相似文献
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CFD Analysis of Gas Distributor in Packed Column ——Prediction of Gas Flow and Effect of Tower Internals Geometry Structure 总被引：2，自引：0，他引：2
Asoneofinternalparts,thefeedgasdistributorplaysanimportantroleinapackedcolumn.Thesmoothoperationandbetterqualityofproductsaregreatlyinfluencedbyitsperformance,especiallyinthecolumnwithlargediameter,shortpackedbedandlowpressuredrop.Duetotheimpor tanceoftheuniformityofinletgasdistribution ,itisessentialtodesignagoodfeedgasdistributor.However,fewtheoreti calandexperimentalapproacheshavebeencarriedoutinthisareasofarduetothecomplexityofthefluidflow[1 ,2 ] . Theliquidflowstructureisimprovedbyanew… 相似文献
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