Consider Distillation Process Dynamic Simulation And Analysis Of Condenser Leakage

Chemical process have flammable or toxic chemicals to use in large doses high temperature and high pressure or low temperature vacuum mode of operation are used,therefore devices will exist the potential risk of fire, explosion and poisoning.The distillation operation is one of the most important elements in chemical production,therefore, to carry out dynamic simulation of distillation process is of great significance for the realization of distillation column control of security and stability of production.In this paper, the dynamic behavior of condenser leakage of distillation column is carried out simulation,in order to provide the basis for detection and exclusion of the fault, and to provide the reference for the optimizing control of distillation column. The main research contents are as follows:1.According to the MESH equation of multiplate model, using the exchanger to accurately express the condenser and reboiler,establishing a strict process dynamic model of distillation column.The case study shows that comparing with the basic model of distillation tower of the paper, due to take into account the dynamic of condenser and reboiler, the characteristics of dynamic response is closer to actual production.2.Carrying out dynamic simulation of condenser leakage of distillation tower.With methanol-water system as an example, for dynamic simulation of the condenser leakage process, using the conventional control strategy of the distillation tower,investigating the dynamic response behavior of the parameters when distillation column occur leakage,the results as follows:(1) when the distillation tower happen condenser inner leakage:the flow of the bottom and the top both increase. Leading to the methanol mass fraction of the top drops.The level of the reflux tank rises.the reflux flow increase.the reboiler duty increases.the gas-liquid phase flow rate increases;(2)when the distillation tower happen condenser external leakage,the component of the bottom was taken to the top.the bottom flow drops and top flow increases.The proportion of volatile components increase in the top.as a result,the methanol mass fraction of the top drops.The reflux flow drops.The reboiler duty drops.The gas-liquid phase flow drop.The condenser duty drops.3.Carrying out dynamic simulation of condenser leakage of reactive distillation tower.With system of synthesis of ethyl acetate with acetic acid and ethanol as an example,the strict distillation column model is established to simulate the reaction rectification tower,the results as follows:(1) when the reactive distillation tower happen condenser inner leakage:the top flow,the bottom flow and the reflux flow increase.Volatile components of the quantizer increase.Leading to the level of quantizer rises and the temperature rises.the mole fraction of water increases and the mole fraction of ethyl acetate drops in the organic phase of the quantizr.The rise of the level of quantizer leading to the increasing of the reflux flow. The increasing of liquid phase flow rate leading to the increasing of reboiler duty.as a result,the gas phase flow rise and the pressure of tray increase. The conversion in the reaction section changes because of the leakage.(2) when the reactive distillation tower happen condenser external leakage,the droping of flow rate of the cooling medium lead to the drop of the condenser duty. The component of the bottom was taken to the top,as a result,.the mole fraction of water rise and the mole of ethyl acetate drop in the top.The droping of the reflux flow rate lead to the droping of the liquid phase flow of the tray,the reboiler duty and the gas phase flow.The mole fraction of fethyl acetate decrease and the mole fraction of acetic acid rise in the reactive section.