隔壁塔四塔模型的设计计算  

Design and Calculation for Four-Column Model of Dividing Wall Column

作　　者：方静[1] 祁建超[1] 李春利[1] 郭佳佳[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《石油化工》2014年第5期530-535,共6页Petrochemical Technology

基　　金：河北省科技计划项目(13274004D);河北省应用基础研究计划重点基础研究项目(13964506Z);河北省高等学校科学技术研究重点项目(ZH2011221)

摘　　要：在对分离三组分混合物的隔壁塔结构进行分析的基础上,为隔壁塔的设计建立简捷计算的四塔模型,以最佳中间组分分配比为基础,以汽相分配比和液相分配比为设计变量,对汽相、液相流量进行平衡,将其作为设计计算的模型约束条件,计算此时全塔的最小汽相流率;基于Underwood-Fenske-Gilliland-Kirkbride计算方法,确定塔的最小回流比、理论塔板数、实际塔板数以及进料和采出位置。以分离正己烷、正庚烷和正辛烷的混合物为例,对隔壁塔进行简捷计算,得到汽、液相分配比的初值;再进行严格计算,对汽、液相分配比进行优化分析,得到最优的设计参数。A short-cut design method of a four-column model for the separation of a threecomponent mixture was established based on the analysis of dividing wall column（DWC） structure. The minimum vapor flow rate of an overall column was calculated based on the preferred distribution ratio of the middle components βp with the vapor distribution ratio Rv and the liquid distribution ratio RL as design variables. The equilibrium of the vapor phase and liquid phase flows was used as the constraint condition of the design calculation. The minimum reflux ratio, theoretical plate number, actual plate number, feed position and outlet position were obtained by means of the Underwood- Fenske-Gilliland-Kirkbride method. For the separation of n-hexane, n-heptane and n-octane ternary system as an example, the initial values of the Rv and RL could be obtained by the short-cut design of DWC. Then the optimized Rv and RL were obtained by means of the Radfrac module of Aspen Plus software.

关 键 词：隔壁塔 热耦合精馏塔 简捷设计方法 四塔模型 

分 类 号：TQ051.81[化学工程]