用SRK方程与PR方程求算双组分混合气体热力学性质  

The Calculation of Thermodynamic Properties for Binary Mixtures of Gases with SRK and PR Equations

作　　者：于志家[1] 杨筱恬[1] 

机构地区：[1]大连理工大学化工与环境生命学部,辽宁大连116024

出　　处：《化工高等教育》2013年第1期59-62,80,共5页Higher Education in Chemical Engineering

基　　金：大连理工大学教改基金资助;项目编号:ZD201206

摘　　要：流体热力学性质的计算是化工热力学中的一类重要计算,立方型方程经常用于这类计算中。SRK方程与PR方程是在RK方程基础上发展而来的,具有比RK方程更好的计算精度。但现有教材中没有给出PR方程和SRK方程的剩余焓、剩余熵的计算公式,缺失了流体热力学性质计算的系统性。本文通过立方型状态方程的一般形式推导出PR方程和SRK方程的剩余焓、剩余熵的计算公式,利用Excel电子表格计算双组分混合气体的热力学性质。计算过程简捷明了,利于学生更好地理解混合物热力学性质的计算过程。The calculations of thermodynamic properties of fluids are important calculations in Chemical Engineering Thermodynamics. The cubic equations of state are frequently used for such calculations. SRK equation and PR equation are developed based on RK equations and can get a better accuracy. But in present textbooks, there is no description on the calculation of residual enthalpy and residual entropy with PR equation and SRK equation, resulting in the incompleteness in the calculation methodology. In this paper, we derive residual enthalpy and residual entropy calculation formula of PR equation and SRK equation based on the generalized cubic equation of state. With Microsoft Excel spread sheet, thermody- namic properties of a binary gaseous mixture are calculated. The use of Microsoft Excel enables the calcu- lation process simple and intuitive, and helps students better in understanding the calculation procedures.

关 键 词：化工热力学 流体热力学性质 气体混合物 SRK方程 PR方程 EXCEL 

分 类 号：TQ013.1[化学工程] G642[文化科学—高等教育学]