Control structure comparison for three-product Petlyuk column  

作　　者：Shengkun Jia Xing Qian Xigang Yuan Sigurd Skogestad 

机构地区：[1]School of Chemical Engineering and Technology, Chemical Engineering Research Center, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin),State Key Laboratory of Chemical Engineering, Tianjin University [2]Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU)

出　　处：《Chinese Journal of Chemical Engineering》2018年第8期1621-1630,共10页中国化学工程学报（英文版）

基　　金：Supported by the National Basic Research Program of China(973 Program:2012CB720500);the National Supporting Research Program of China(Grant2013BAA03B01);the National Natural Science Foundation of China(21176178);the China Scholarship Council(201506250011);the China Postdoctoral Science Foundation(2017M620587)

摘　　要：The focus of this paper is to investigate different control structures(single-loop PI control) for a dividing wall(Petlyuk) column for separating ethanol, n-propanol and n-butanol. Four control structures are studied. All the results are simulations based on Aspen Plus. Control structure 1(CS1) is stabilizing control structure with only temperature controllers. CS2, CS3 and CS4, containing also composition controllers, are introduced to reduce the steady state composition deviations. CS2 adds a distillate composition controller(CCDB) on top of CS1. CS3 is much more complicated with three temperature-composition cascade controllers and in addition a selector to the reboiler duty to control the maximum controller output of light impurity composition control in side stream and bottom impurity control in the prefractionator. CS4 adds another high selector to control the light impurity in the sidestream. Surprisingly, when considering the dynamic and even steady state performance of the proposed control structures, CS1 proves to be the best control structure to handle feed disturbances inserted into the three-product Petlyuk column.The focus of this paper is to investigate different control structures（single-loop PI control） for a dividing wall（Petlyuk） column for separating ethanol, n-propanol and n-butanol. Four control structures are studied. All the results are simulations based on Aspen Plus. Control structure 1（CS1） is stabilizing control structure with only temperature controllers. CS2, CS3 and CS4, containing also composition controllers, are introduced to reduce the steady state composition deviations. CS2 adds a distillate composition controller（CCDB） on top of CS1. CS3 is much more complicated with three temperature-composition cascade controllers and in addition a selector to the reboiler duty to control the maximum controller output of light impurity composition control in side stream and bottom impurity control in the prefractionator. CS4 adds another high selector to control the light impurity in the sidestream. Surprisingly, when considering the dynamic and even steady state performance of the proposed control structures, CS1 proves to be the best control structure to handle feed disturbances inserted into the three-product Petlyuk column.

关 键 词：Distillation columns Automatic process control Computer-aided control system design Petlyuk columns 

分 类 号：TE65[石油与天然气工程—油气加工工程] TQ053.5[化学工程]