不同压力下石油馏分平衡汽化曲线换算的数学模型  

Mathematical model of interconversion to EFV curves for petroleum fractions at different pressure

作　　者：曹睿[1] 王俊[1] 刘艳升[1] 严超宇[1] 蒋荣兴[2] 

机构地区：[1]中国石油大学(北京)化学科学与工程学院,北京102249 [2]中国石化建设工程公司,北京100101

出　　处：《计算机与应用化学》2010年第3期405-408,共4页Computers and Applied Chemistry

摘　　要：本文针对现有工艺计算中存在的缺乏一定压力下的石油馏分汽液平衡数据,并且3种石油馏分蒸馏曲线之间难以换算等问题,对不同压力下石油馏分平衡汽化曲线换算的数学模型进行了研究。通过对常压和减压下石油馏分平衡汽化曲线的换算图表数据进行回归,同时总结了前人已有的常压与加压下的平衡汽化曲线换算模型,从而建立了1套完整的不同压力下的平衡汽化曲线换算模型。采用该模型可以为不同压力下的蒸馏设计计算提供基础数据,避免了以往单纯依靠经验数据的缺点,可以提高蒸馏塔的设计精度。新模型采用拟多项式的非线性函数,可以直接进行双向计算,稳定性高,模型的最大相对误差为3.52%。通过用实测数据对新模型进行验证,结果表明新模型的计算值与常压、减压下的平衡汽化数据吻合良好,最大相对误差不超过0.52%,说明新模型的计算精度令人满意。Accounting for the case of that the equilibrium flash vaporization data about the petroleum fractions at certain pressure are insufficient and the three types of distillation curves are difficult to be interconverted in process calculations, the mathematical models of interconversion to EFV curves for petroleum fractions at different pressure were investigated in this paper. The diagrams of interconversion between EFV curves at atmospheric and vacuum conditions were regressed. Moreover, the corresponding interconversion models of EFV curves at atmospheric and high pressure conditions in the literatures were also reviewed. Therefore, a set of integrate new inter- conversion models for EFV curves at different pressures were established. The models provide basic data for the calculation of the distil- lation design under different pressure, where the empirical data were mainly used previously. It can improve the design accuracy of the distillation column. The model is the nonlinear quasi-polynomial function, which has the high calculation stability and can be applied to bidirectional numerical simulation. The max relative error of the models is 3.52%. Furthermore, the model has been checked by the measured EFV data at atmospheric or vacuum pressure. The predicted values agree well with the measured data. The maximum relative error is no more than 0. 52%.

关 键 词：石油馏分 数学模型 平衡汽化 不同压力 

分 类 号：TE622.5[石油与天然气工程—油气加工工程]