化工原理教学中的核心概念:传递的平衡态与过程的推动力

The Core Concept in the Course of Principles of Chemical Engineering:Transfer Equilibrium State&Process Driving Force

热力学平衡、过程推动力是化工原理课程中的两个核心概念,对于理解传递过程非常重要。文章围绕这两个概念,基于单元操作的特性与物理定律,建立相应的平衡线方程,从理论上明确传递的极限(终点);进一步依据传递方程的基本表达式,用图示法对传递过程的推动力进行具体描述,强调推动力在传递动力学中的核心作用,从工程实际角度加深学生对化工传递过程的理解。

Thermodynamic equilibrium and process driving force are core concepts in the course of principles of chemical engineering,they are important for students to understand the transfer processes in chemical unit operation.In this paper,according to the characteristics of the process,the corresponding equation of the equilibrium line is established by the laws of physics and the limit(end point)of transfer is theoretically clarified.Furthermore,on the basis of the expression of the transfer equation,the specific description of the driving force of the transfer process is made with the graphic method,emphasizing the core role of driving force in the transfer dynamics,so that students can have a clear understanding on the chemical transfer process from the view of engineering practice.