The Simulation And Calculation Of The Fully Thermally Coupled Distillation Columns For C4Mixture Separation

Distillation unit is one of the largest energy consumption unit in petrochemicalindustry. The traditional distillation’s energy efficiency is very low because of the processirreversibility is large. Due to the relatively large energy consumption of rectificationdevice energy-saving tap potential is also big, so the distillation energy-saving technologyresearch received more attention from academia and industry. Fully thermally coupleddistillation technology is a kind of new energy saving technology. By changing the towerstructure and using internal flow heat coupling,its process have changed and can save alarge amount of energy consumption and reduce the investment cost.This papper’s simulation and calculation is based on the three components of C4mixture thermal coupling distillation. First fully thermally coupled distillation columns issimplified into three simple clear separation tower by using of three-tower model, so wecan use the Fenske-Underwood to make a simulation and caculation. In this step, the platenumber and reflux ratio were obtained by simple method of design and simulation. Afterthe initial value and operating conditions were obtaind, using RadFrac model of Aspensoftware to complete a rigorous simulation. Balancing and optimize the product separationunder a area which a given design minimizes the heat duty supplied to the reboiler.After the initial value and operating conditions were obtaind, using RadFrac model ofAspen software to complete a rigorous simulation. As rigorous simulation was employed,The results show that the Fully thermally coupled distillation columns can reduce about25%energy consumption and capital investment comparing to conventional distillationconsequences for separation of ternary-components C4hydrocarbon mixture.Finally in this paper, the different separation factor and feed composition thermalcoupling distillation simulation studies, comparison of5kinds of distillation sequence atthe same time, including: direct sequence, indirect sequence, side rectification, sidestripping and fully thermally coupling distillation. After the simulation found that when theseparation index:ESI≈1change the feed composition on the thermal coupling distillationminimal impact energy saving data, meanwhile thermal coupling distillation applicabilityis the largest, when other ESI <1, increase of intermediate component content in the feedto improve thermal coupling distillation energy saving rate is very useful. When the ESI>1thermal coupling distillation energy saving rate is the lowest. On the thermal couplingdistillation simulation steps and simulation analysis results, set the stage for the futureinvestigations.