摘要
膜阻力是传质工艺计算的基本特征量,反映了传递过程的动力学属性。为了说明气液传质机理,本文针对吸收操作中易混淆的控制阻力问题进行讨论,通过图解对比了易溶、难溶体系的阻力分配情况,对影响膜阻力大小和分配比例的热力学因素及动力学因素(如相平衡、流动状况、化学反应等)作了分析,结合算例说明了工业生产中膜阻力分配的可控性及确定控制阻力的工程意义,此外还评价了膜阻力在不同单元操作过程中的个性差异。
Film resistance is the basic characteristic parameter in the calculation ofmass transfer process. It demonstrates the dynamic properties of the process. The controlling film resistance in absorption, which often results in misunderstanding, has been discussed to reinforce the comprehension of the gas- liquid mass transfer mechanism. The resistance distribution of soluble/dissoluble system has been ana- lyzed by graphical method. It is helpful to evaluate the effects of the thermodynamic and kinetic influen- cing factors on film resistance, such as the equilibrium condition, flow behaviors, chemical reaction, and so on. The results have been validated by the cited example. It indicates that the film resistance distribu- tion can be adjusted and controlled in industrial application, which interprets the meaning of engineering in determining the controlling film resistance. In addition, the distinct characteristics of the film resist- ance are compared among individual unit operations.
出处
《化工高等教育》
2014年第3期88-92,105,共6页
Higher Education in Chemical Engineering
基金
中国石油大学(北京)校青年基金(No.2462012KYJJ0319)
中国石油大学(北京)化工原理教学改革项目资助
关键词
吸收
解吸
膜阻力
气膜控制
液膜控制
相平衡
传质系数
Absorption/Desorption
Film resistance
Gas-film controlling/Liquid-film controlling
Equi-librium
Mass transfer coefficient
