基于PR-EOS的酸气-水体系二元交互系数修正与应用  

Modification and application of binary interaction parameters for acid gas-water based on PR-EOS

作　　者：王治红[1] 温立宪 杜竹影 刘佳 张志锋 WANG Zhi-hong;WEN Li-xian;DU Zhu-ying;LIU Jia;ZHANG Zhi-feng(School of Chemistry&Chemical Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan Province,China;The First Natural Gas Plant of Changqing Oil-field Constituent Company,Jingbian718500,Shaanxi Province,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500 [2]中国石油长庆油田分公司第一采油厂,陕西靖边718500

出　　处：《化学工程》2020年第8期36-41,共6页Chemical Engineering(China)

摘　　要：PR状态方程虽应用广泛,能够准确预测出非极性物质的物性参数,但对含有极性物质如水的体系适用性较差。为此,文中根据实验测得的H 2 S-H 2 O、CO 2-H 2 O和CH 4-H 2 O二元体系气液相平衡实验数据,分别将其二元交互作用系数拟合成温度和压力的函数。在此基础上,分别预测了H 2 S-H 2 O、CO 2-H 2 O、CH 4-H 2 O和H 2 S-CO 2-CH 4-H 2 O体系的气液相平衡。结果表明:修正二元交互作用系数后,H 2 S-H 2 O体系的平均相对偏差降低至3.43%,CO 2-H 2 O体系的平均相对偏差降低至6.72%,CH 4-H 2 O体系的平均相对偏差降低至4.37%;对于H 2 S-CO 2-CH 4-H 2 O多组分体系,修正后的二元交互系数预测精度明显高于PR状态方程的预测精度。修正二元交互作用系数后不仅能为准确预测H 2 S-CO 2-CH 4-H 2 O多组分体系的气液相平衡提供依据,还可将其修正过程运用于其他含极性物质体系的相平衡计算。Because of the accuracy for prediction,the PR equation of state is widely used,but it is not very suitable for the system containing polar substances like water.In this paper,the binary interaction parameters(BIP)for hydrogen-water,carbon dioxide-water and methane-water binaries were fitted to a formula which was correlated to the temperature and pressure based on experimental vapor-liquid equilibrium data.Finally,the vapor-liquid phase equilibrium of hydrogen-water,carbon dioxide-water,methane-water and hydrogen sulfide-carbon dioxide-methane-water mixtures were predicted.The results show that,through modifying binary interaction coefficients,the average relative deviation of hydrogen-water,carbon dioxide-water and methane-water mixtures between the experimental and calculated water contents in the vapor phase are reduced to 3.43%,6.72%and 4.37%;for the hydrogen sulfide-carbon dioxide-methane-water mixtures,the prediction accuracy of corrected binary interaction coefficient are significantly higher than that of the PR equation of state.The achievement provides a practical way to calculate the vapor-liquid phase equilibrium of hydrogen sulfide-carbon dioxide-methane-water mixtures.

关 键 词：PR状态方程 硫化氢 二氧化碳 甲烷 水 气液相平衡 

分 类 号：TQ013.1[化学工程]