Study On Characteristics And Algorithms Of Multi-component High Temperature Distillation Reflux Ratio

Abstract:Reflux ratio is the main factor of affecting the distillation separation effect, is the key parameters of energy saving distillation process, and also a difficult problem of operation optimization of distillation process. In order to solve the multiple components of high temperature distillation system transition separation problem, to realize the control of multi-component high temperature distillation reflux ratio, achieve the purpose of energy saving, properties and algorithm of the multi-component high temperature distillation reflux ratio were studied. Mainly completed the following work:(1) The chemical distillation mathematical model as the basis, comparing the advantages and disadvantages of the traditional mathematical model and its solving method, combined with the characteristics of multi-component high temperature distillation, the components of high temperature distillation system mathematical model, namely MESH-C equation, the multi-component high temperature distillation system step-by-step calculation method, and the preparation of the sequential simulation program using MATLAB.(2) Analysis of multicomponent high-temperature distillation flow and component concentration variation, the return tray two adjacent blocks between tower back flow, evaporation changes in an arithmetic progression, increasing from the top level, tolerance and heat dissipation is proportional; reflux ratio and reflux heat flux is proportional, therefore in the case of minimum reflux ratio of distillation, the minimum energy consumption; the return tray two adjacent blocks between tower volatile component concentration is approximately geometric series change, heat flux, reflux condensation of steam pressure, disc, activity coefficient will affect the change rate of concentration.(3) Relative error of calculation of the heat release calculation are obtained by the MESH-C model and thermal test between2.4%-4%, verify the accuracy of the mathematical model of MESH-C. Flow and zinc distillation lead tower reflux section of the variation of concentration and multi-component high temperature distillation system mathematical model analysis results, verify the applicability of multiple group high-temperature distillation system mathematical model and its calculation method.(4) Through a detailed analysis of the reflux ratio and the relationship between the material ratio, concentration, feed state, the return tray outside temperature, put forward in order to meet the separation task, target function to achieve maximum production for rectification operation, and its programming solving process using C language program, solution minimum reflux ratio. The results show that:the minimum reflux in this study, the calculated ratio, adjusting the lead column parameters, can realize energy-saving2186tons of standard coal/year.