常压塔顶冷凝系统水露点预测

发布时间：2018-03-23 17:35

本文选题：常压塔顶冷凝系统　切入点：塔顶油气　出处：《石油学报(石油加工)》2017年01期

【摘要】：以常压塔塔顶石脑油的相对密度和蒸馏数据为基础,通过化工流程模拟软件Aspen Plus生成了一系列虚拟组分,计算了每个虚拟组分的摩尔分数、标准沸点、相对密度和相对分子质量,并估算了每个虚拟组分的临界性质和偏心因子。使用Peng-Robinson方程对常压塔塔顶油气馏分进行严格三相平衡计算,研究了烃-水之间的二元交互作用参数对水在烃相的溶解度及水露点的影响。假设塔顶油气体系形成的水相为游离水,研究了水在烃相的溶解度对水露点的影响。计算结果表明,烃-水之间的二元交互作用参数对水在烃相的溶解度影响非常显著,当交互作用参数取0.43时,计算的水的溶解度与API Data Book计算值一致。使用2种方法计算时,水在烃相的溶解度对水露点的影响均不明显。使用严格的三相平衡计算的水露点为384.65K,比基于游离水假设计算的水露点高1.3K。
[Abstract]:Based on the relative density and distillation data of naphtha at the top of atmospheric tower, a series of virtual components were generated by chemical process simulation software Aspen Plus, and the molar fraction and standard boiling point of each virtual component were calculated. The critical properties and eccentricity factors of each virtual component are estimated. The Peng-Robinson equation is used to calculate the strict three-phase equilibrium of the top oil and gas fractions of the atmospheric tower. The effects of the binary interaction parameters between hydrocarbon and water on the solubility and dew point of water in hydrocarbon phase are studied. It is assumed that the water phase formed by the oil and gas system at the top of the tower is free water. The effect of solubility of water in hydrocarbon phase on water dew point is studied. The results show that the binary interaction parameter between hydrocarbon and water has a significant effect on the solubility of water in hydrocarbon phase, and when the interaction parameter is 0.43, The calculated solubility of water is consistent with that calculated by API Data Book. The water dew point calculated by strict three-phase equilibrium is 384.65K, which is 1.3K higher than that calculated based on free water hypothesis.
【作者单位】：西安交通大学化学工程与技术学院;中国石油兰州石化公司研究院;
【基金】：中国石油天然气股份有限公司项目(20151191)资助
【分类号】：TE624

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