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萃取精馏隔壁塔分离乙酸乙酯-乙腈共沸物系的动态控制研究

发表时间:2017-01-17  浏览量:1622  下载量:488
全部作者: 王晓红,田光珍,谢力
作者单位: 青岛科技大学化工学院
摘 要: 以乙酸乙酯-乙腈共沸物系为分离体系,提出采用萃取精馏隔壁塔代替常规两塔萃取精馏序列的新工艺。利用Aspen Plus软件,对稳态工艺流程进行优化。在此基础上进行动态控制研究,通过进料流率和进料组成扰动结果评价控制结构的有效性。结果表明,基础控制结构方案在面对流量扰动和组成扰动时存在纯度偏差较大、温度响应缓慢的问题。针对存在的问题,提出带有温度控制器、组成控制器及q/f(再沸器热负荷与进料量之比)前馈控制的改进控制结构方案,在面对进料流量和进料组成扰动时能实现稳健的动态控制。本研究成果将对采用工业萃取精馏隔壁塔分离低碳二元共沸物系的设计和生产提供理论依据。
关 键 词: 化工系统工程;乙酸乙酯-乙腈;萃取精馏隔壁塔;动态模拟;控制方案
Title: Study on the dynamic control of extractive dividing-wall column for separating ethyl acetate-acetonitrile systems with azeotrope
Author: WANG Xiaohong, TIAN Guangzhen, XIE Li
Organization: College of Chemical Engineering, Qingdao University of Science and Technology
Abstract: In order to separate the system of ethyl acetate-acetonitrile, a new separating process of extractive dividing-wall column was put forward to replace the distillation of the conventional sequence. Using the software of Aspen Plus, the steady-state process was optimized. On the basis of the steady state flow sheet, the dynamic characteristics of control structure were studied and the effectiveness of the control structure was evaluated by the disturbance of feed flow rate and feed composition. Results show that the basic control structure cannot deal with the disturbance of feed flow rate and feed composition well. The problems of large deviation of purity and slow response to the temperature would still be existed. Ultimately, the improved control structure scheme with temperature controller, composition controller and q/f (ratio of reboil thermal load and feed quantity) feed-forward control can deal with the disturbance of feed flow rate and feed composition well. The results will be of theoretical guiding significance to the design and production of the industrial separation process for lower carbon binary azeotrope systems.
Key words: chemical system engineering; ethyl acetate-acetonitrile; extractive dividing-wall column; dynamic simulation; control scheme
发表期数: 2017年1月第1期
引用格式: 王晓红,田光珍,谢力. 萃取精馏隔壁塔分离乙酸乙酯-乙腈共沸物系的动态控制研究[J]. 中国科技论文在线精品论文,2017,10(1):98-105.
 
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