基团贡献法预测胜利原油>350℃常压重油气液平衡

/ PREDICTION OF VAPOR LIQUID EQUILIBRIUM BY USING GROUP CONTRIBUTION METHOD

测定了胜利常压重油的气液相平衡常数和各窄馏分的相应物性参数，在此基础上，得到了计算胜利常压重油气液相平衡常数的经验关联式。用正构烷烃模型分子法及相对分子质量确定石油窄馏分的基团组成，在实测数据的基础上，对ＵＮＩＦＡＣ基团贡献型饱和蒸气压模型参数进行修正。对ＵＮＩＦＡＣ饱和蒸气压模型参数修正后，ＫｉｋｉｃＫ和ＬａｒｓｅｎＫ模型预测闪蒸温度的平均相对偏差均为０．７９％；气化率的平均相对偏差分别为７．６９％和７．７７％，均可满足工程计算要求。

The experiential correlation expressions for calculating vapor liquid equilibrium of Shengli reduced crude oil are established on the basis of experimental data. The group composition of narrow petroleum fraction is determined by normal paraffin model molecule method. The parameters of vapor pressure model are modified with experimental data. Kikic K model and Larsen K model for predicting flash temperature ( T c) and flash vaporization ratio ( E c) are improved.The calculated average deviations of T c by two models are 0.79%, and those of E c are 7.69% and 7.77% respectively, which can meet the engineering need.