LKP状态方程在天然气热物性参数计算的应用  

Application of LKP Equation of State in Calculation of Natural Gas Thermo-physical Parameters

作　　者：申琳 杨文川 徐嘉爽 苑伟民 SHEN Lin;YANG Wenchuan;XU Jiashuang;YUAN Weimin

机构地区：[1]中国石油工程建设有限公司西南分公司,四川成都610041 [2]国家管网集团北海液化天然气有限责任公司,广西北海536000

出　　处：《煤气与热力》2021年第6期31-38,I0043,共9页Gas & Heat

摘　　要：结合文献,对天然气物性参数计算公式进行了梳理,阐述用Lee-Kesler-Plocker状态方程(LKP状态方程)求解天然气各物性参数(密度、压缩因子、摩尔焓、摩尔熵、摩尔热容、摩尔热容比)的方法及其求解过程。根据热力学基本公式,依据LKP状态方程,推导和补充了单组分理想气体摩尔焓和摩尔熵,以及焦耳-汤姆逊系数和气体声速的计算公式。通过计算实例,将LKP状态方程方法计算值和文献实测值进行对比,结果表明,LKP状态方程及其导出的热物性计算公式和方法用于计算天然气各常用热物性参数的计算,易于编程计算,计算准确度高,值得在工程计算中推广应用。Combined with the literature,the calculation formulas of natural gas physical parameters are sorted out,and the method and solution process of using Lee Kesler-Plocker equation of state(LKP equation of state)to solve the thermo-physical parameters of natural gas,such as density,compressibility factor,molar enthalpy,molar entropy,molar heat capacity and molar heat capacity ratio are described.According to the basic formula of thermodynamics and based on the LKP equation,the calculation formulas of molar enthalpy and entropy,Joule Thomson coefficient and sound velocity of a single component ideal gas are derived and supplemented.Through calculation examples,the calculated values of the LKP equation of state method are compared with the measured values in the literature.The results show that the LKP equation of state and its derived thermophysical property calculation formulas and methods are used to calculate the common thermophysical parameters of natural gas,it is easy to program and calculate,and the calculation accuracy is high,it is worthy of popularization and application in engineering calculations.

关 键 词：LKP状态方程 热物理性质 摩尔热容 等熵指数 热物性参数 

分 类 号：TE832[石油与天然气工程—油气储运工程]