汽液相平衡中无模型法的计算及应用

发布时间：2018-05-21 01:30

本文选题：相平衡 + 组成　；参考：《化工学报》2017年01期

【摘要】：汽液相平衡计算是化工过程开发及优化设计的基础。汽液相平衡计算的核心是确定体系处于平衡状态时,温度T、压力p、液相组成x及汽相组成y 4个变量之间的关系。在这4个变量中,汽相组成一般难以准确测定,低浓度汽相组成的测定偏差更为明显,因此一般实验测定T、p、x,用热力学方法推算y。由T、p、x数据推算y的方法分为模型法和无模型法两种,无模型法由于不需要考虑各种活度系数模型的使用限制条件而备受国内外学者的关注。通过分析无模型法的原理,按照直接法和间接法两部分对目前无模型法的发展历程进行归纳综述,着重比较了各方法的适用体系、收敛速度和计算精度等方面,总结了几种常用方法的应用情况,并对无模型法未来的研究方向进行了展望。
[Abstract]:Vapor-liquid equilibrium calculation is the basis of chemical process development and optimization design. The core of vapor-liquid equilibrium calculation is to determine the relationship between temperature, pressure, liquid phase composition x and vapor phase composition y when the system is in equilibrium state. Among these four variables, the vapor phase composition is generally difficult to determine accurately, and the deviation of the determination of the low concentration vapor phase composition is more obvious. Therefore, the general experimental method is used to determine the composition of the vapor phase, and the thermodynamic method is used to calculate y. There are two methods for calculating y from the data of TpX: model method and model free method. The model free method has attracted the attention of scholars at home and abroad because it does not need to consider the limited conditions of the use of various activity coefficient models. By analyzing the principle of model-free method, according to the direct method and indirect method, the development history of the current model-free method is summarized, and the applicable system, convergence speed and calculation precision of each method are emphatically compared. The application of several common methods is summarized, and the future research direction of model-free method is prospected.
【作者单位】：青岛科技大学过程系统工程研究所;石化盈科信息技术有限责任公司上海分公司;
【基金】：国家自然科学基金项目(21176127)~~
【分类号】：TQ013.1

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