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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。
In view of the lack of certain data on the vapor-liquid equilibrium of petroleum distillate in the calculation of the existing technology and the difficulty of converting the distillation curves of the three kinds of petroleum distillates, the mathematical models for the conversion of equilibrium vaporization curves of petroleum distillates under different pressures the study. Regression chart data by converting under reduced pressure to atmospheric pressure and vaporized petroleum fractions equilibrium curve, while the curve summarizes the equilibrium vaporization predecessors the existing atmospheric pressure and in terms of the model, so as to establish a complete set of different pressures Under the equilibrium vaporization curve conversion model. Using this model can provide basic data for distillation design and calculation under different pressures, avoiding the shortcoming of relying on empirical data in the past and improving the design accuracy of distillation column. The new model uses quasi-polynomial nonlinear function, which can be directly bi-directional calculation, the stability is high, the maximum relative error of the model is 3.52%. The experimental results show that the calculated value of the new model is in good agreement with the equilibrium vaporization data at atmospheric pressure and reduced pressure, and the maximum relative error is less than 0.52%, which shows that the calculation accuracy of the new model is satisfactory.