Study On The Hydromechanics Of New Catalytic Distillation Internals

In order to improve performance of catalytic distillation column,two new types of column internals were proposed.A study on the hydromechanics of the two column internals was carried out in cold model experiment equipment,using air-water as medium.The influence of column internals structure parameters,such as opening ratio,loaded catalyst volume,catalyst diameter etc.on the hydromechanics was investigated.Elevated quantity was measured by the self-developed elevated quantity collector,and the influence of the opening ratio,loaded catalyst volume and catalyst diameter on elevated quantity was studied.The results show that the two new column internals are feasible.Comparing the two new internals with the New VST standard cap,the two new internals tray pressure drop is higher and the pressure drop of the cylindrical column internal is greater than the inverted cone column internal.For the entrainment,two new column internals are low,and the entrainment in inverted cone column internal is the minimum.The pressure drop of cylindrical column internal and the inverted cone column internal are similar.And bed pressure drop increases with the rising of gas velocity,catalyst loading quantity,decreases with the increasing of catalyst particle size and cap opening ratio.But when the opening ratio is greater than 1,the pressure drop will be stable.For the elevated quantity study,based on energy and mass conservation law and the experimental data,the mathematical model of the elevated quantity of cylindrical internals is found.Through model calculation and data analysis,the maximum absolute error between experimental value and calculated value is 0.0022g/s,the relative error is less than 15%,the average relative error is 4.75%.The calculation value and experimental data are fit well.