返混相关概念理解以及在化工过程建模中的体现

Understand of Back-mixing and Its Application in Chemical Process Modeling

返混作为化工学科中的一个重要概念,对于理解设备内部非理想流动、停留时间分布和微观混合等知识点非常有帮助。化工过程建模,也存在返混效应不能忽视的情况,需要在模型中正确地体现出返混因素,对于化工专业的学生而言,理解并正确地认识返混及其建模,有一定难度。本文对返混概念和实质进行了阐述,以及建模过程中的注意事项,并对隔板精馏塔中出现的再混合效应和返混作了区别,这些内容有利于学生更好地掌握返混方面的知识及其运用。

As an important knowledge of chemical engineering,backmixing is helpful to understand non-ideal flow and resident time distribution.So it is crucial to reflect backmixing in the modeling of chemical process.It is hard for some students to understand and grasp this point.So,in this paper,backmixing is detailed elaborated,and how to express backmixing in the model is exampled.Also the remixing in DWC is different from the traditional backmixing,which is explained in the final section.These will help student understand these key points more effectively.