基团贡献法预测孤岛-草桥馏分油气液平衡研究

VAPOR LIQUID EQUILIBRIUM PREDICTION OF GUDAO CAOQIAO PETROLEUM FRACTIONS WITH GROUP ANALYSIS

提出了两个计算孤岛－草桥混合原油及其常压重油馏分油气液平衡常数的经验关联式，经考察经验关联式的预测结果良好。采用ＵＮＩＦＡＣ基团贡献模型，用正构烷烃模型分子法确定基团组成，考察了三种模型对原油的泡点、露点及气化率的预测情况，发现拉乌尔平衡常数模型的预测结果最好。对于重油的气液平衡预测，使用ｎ－ｄ－Ｍ－ＬＰ法确定基团组成，经验修正Ｌａｒｓｅｎ模型并回归基团值，对孤岛－草桥、胜利重油的泡点、露点及气化率进行预测，修正后模型提高了预测的精确度。

Two empirical correlation equations for Gudao Caoqiao mixed crude oil and its atmospheric residue were proposed to calculate the equilibrium constants of the fractions. By using the UNIFAC method, three kinds of model were investigated to predict the vapor liquid properties, such as bubble point, dew point and vaporization ratio of crude oil with the method of normal paraffin molecular model to devide groups. It was shown that the result of Rault model was the best. For residue, the method of n d M LP was adopted to divide groups. After modifying the model of Larsen and regressing some of the group parameters, the prediction accuracy was improved.