Simulation And Operation Problem Analysis Of BTX Production Process

BTX production process generally uses catalytic reforming oil or pyrolysis gasoline as raw materials.Benzene,toluene and xylene products in line with national standards are obtained through three processes: raw material pretreatment,aromatics extraction and aromatics distillation.Firstly,according to the operation and equipment data of BTX production process in a refinery,PRO/II 9.4 was used to simulate the steady-state process,and the models of depentanizer column,decomposition column,extraction column,stripping column,recovery column,benzene column,toluene column and xylene column were es Tablelished to simulate the process.Then the simulation results were compared with the actual operation results of the process,and the accuracy of the simulation was verified.The key parameters such as solvent ratio,backwashing ratio and column pressure were analyzed and optimized by using the simulation results.In addition,according to the energy consumption of the process,specific suggestions were put forward to achieve energy-saving effect.Through steady-state simulation,the aim of improving product quality and yield,saving energy and reducing consumption was achieved.Secondly,after a long period of operation,problems such as degradation of sulfolane and low qualified rate of BTX products appeared in the BTX production process,which affected the long-term safe,s Table and efficient operation.In this paper,the steady-state simulation process was used to study these two problems.On the one hand,this paper analyses the causes of sulfolane degradation and degradation,and puts forward some specific solutions such as temperature control system,air tightness enhancement,p H value concern and strict process dehydration.The start-up and shutdown schemes of stripping column and recovery column had been partially adjusted to effectively slow down the degradation of sulfolane.On the other hand,the reasons of low qualified rate of BTX products were analyzed,and corresponding solutions were put forward,such as optimizing operation parameters of stripping column,adding frequency converter regulator of air cooler,etc.,to improve the qualified rate of BTX products.In addition,dynamic model of benzene column was es Tablelished by dynamic simulation software Dynsim 5.3.2,disturbance was added to control structure of temperature,pressure and flow,and dynamic response of control system was analyzed.As a result,it is helpful to analyze the source of fluctuation according to device parameters and product changes in the production process,so as to ensure the quality and yield of BTX products.This study has certain guiding significance for reducing energy consumption of BTX production process,slowing down degradation of sulfolane in BTX production process,and improving the qualified rate of BTX products.