一种改进的分隔壁精馏塔简捷计算方法  

An Improved Shortcut Design Method for Dividing Wall Column

作　　者：叶贞成 倪泽雨 程辉 YE Zhencheng;NI Zeyu;CHENG Hui(Key Laboratory of Advanced Control and Optimization for Chemical Processes,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2021年第1期26-34,共9页Journal of East China University of Science and Technology

基　　金：国家杰出青年科学基金(61725301);国家自然科学基金重点项目(61533003);国家自然科学基金重大项目(61590922);高等学校学科创新引智计划资助(B17017);中央高校基本科研业务费专项资金资助(222201917006)。

摘　　要：针对现有分隔壁精馏塔四塔等效模型简捷计算方法的不足,提出了一种改进的计算方法,根据Underwood方程确定分隔壁精馏塔的最小气相流率。该方法可以结合设计要求快速确定精馏塔的塔板数、进出料位置、回流比、气液分配比等操作参数。为了验证设计方法的有效性,分别选取3种不同分离因子的进料物系进行设计并将获得的设计结果在HYSYS软件中进行严格模拟,结果表明:与其他设计方法相比,该方法可以更准确地计算出预分馏塔与主塔之间连接流股的组成,且所需要的年总成本较小。Dividing wall column has the advantage of energy saving and low capital cost compared to the conventional rectifying column.While this method is more flexible than the conventional rectifying column,its control and optimization are more difficult.In this paper,we address the shortcomings of existing dividing wall column methods by introducing an improved calculation method.The minimum operating conditions of the dividing wall column are determined according to the Underwood equation,and the operating parameters such as the number of stages,the feeding stage,side-stream stage,the reflux ratio,and the gas-liquid distribution ratio of the dividing wall column can be quickly determined in combination with design requirements.To verify the effectiveness of the design method,three different Ease of Separability Index(ESI)feed streams are selected,and the results are strictly simulated in HYSYS.The results show that our method is more accurate than previous methods in calculating the composition of the connecting stream between the pre-fractionator and the main column,and the total annual cost is lower.

关 键 词：精馏 简捷设计 模拟 节能 分隔壁精馏塔 

分 类 号：TP273.1[自动化与计算机技术—检测技术与自动化装置]