回流比对精馏塔理论塔板数的影响:计算机辅助计算在化工原理课程中的应用  

Influence of Reflux Ratio on the Number of Theoretical Plates in Distillation Tower:Application of Computer-Aided Calculation in Chemical Engineering Principle Course

作　　者：汪嘉杨[1] 伍绍贵[2] WANG Jia-Yang;WU Shao-Gui(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China;College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610066,China)

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225 [2]四川师范大学化学与材料科学学院,四川成都610066

出　　处：《化学教育（中英文）》2020年第14期80-84,共5页Chinese Journal of Chemical Education

基　　金：四川省社科规划项目SC18B027。

摘　　要：以精馏塔理论塔板数计算为例介绍计算机辅助计算在化工原理课程中的应用,并研究回流比对理论塔板数的影响。首先对已知塔板数的精馏塔设计实例进行计算,验证程序的正确性;然后以一个工业案例介绍本方法在实际生产中的应用;为了培养学生的探索精神,最后探讨改变参数对理论塔板数的影响,并分析了原因:当回流比减小时,理论塔板数增加,主要是精馏段塔板数增加引起。当回流比以很小的间隔减小时,理论塔板数呈锯齿形增加,是由于提馏段塔板数呈锯齿状变化引起。进一步分析提馏段的操作线和料液组成发现,锯齿状变化是由于进入提馏段料液的液相组成波动所导致。In this paper, we took the calculation of theoretical plate number as an example to introduce the application of computer-aided calculation in the course of chemical engineering principles. First, a distillation tower with known plate number was used to verify the correctness of the program. Then, an industrial case was used to introduce the application of this method in actual production. In order to cultivate students’ spirit of exploration, the influence of changing parameters on the number of theoretical plates was discussed, and the reasons were analyzed finally. When the reflux ratio decreases, the number of theoretical plates increases, which is mainly caused by the increase of the number of plates in the rectification section. When the reflux ratio decreases at small intervals, the theoretical plate number increases in a zigzag manner, which is caused by the zigzag change in the number of plates in the stripping section. Further analysis revealed that the zigzag change of theoretical plate number was resulted from the variation of liquid phase composition in the first plate of the stripping section.

关 键 词：理论塔板数 回流比 精馏 计算机辅助计算 

分 类 号：G642[文化科学—高等教育学] TQ02-4[文化科学—教育学]