重油蒸馏曲线的延伸

Extension of distillation curve of heavy oil

介绍了为延伸石油实沸点蒸馏曲线对分子蒸馏数据进行处理的关联式和模型,并采用分段讨论的方法对重油蒸馏曲线进行了合理准确地描述。当石油馏分常压相当温度AET≤565℃时,分别采用ASTM D2892及ASTM D5236方法绘制蒸馏曲线;当565℃<AET≤700℃时,使用分子蒸馏实验方法结合FRAMOL数学关联式绘制该区间蒸馏曲线,且分子蒸馏所得蒸馏曲线与ASTM方法所得曲线有较好的连续性;当AET>700℃时的石油组分在现有设备及技术条件下很难蒸发,应使用合理的数学模型并根据AET≤700℃蒸馏曲线回归数学模型中系数,外延得到完整的蒸馏曲线。通过以上方法,可相对经济、准确地得到重油蒸馏曲线,并作为流程模拟依据。

The correlation equations and model for the treatment of molecular distillation data to extend the true boiling point distillation curve are introduced, and the heavy oil distillation curves are accurately described on section by section basis. The distillation curves are drawn by means of ASTM D2892 and ASTM D5236 respectively when the atmospheric equivalent temperature AET of petroleum fractions is lower than or equal to 565 ℃. When 565 ℃<AET≤700 ℃, the interval distillation curve is worked out by using molecular distillation experiment method and FRAMOL mathematical correlation. The experimental results show that the distillation curve obtained by molecular distillation has a good continuity with the curve obtained by ASTM method. It is difficult to vaporize the petroleum fractions higher than 700 ℃ with the existing equipment and technical conditions. A complete distillation curve should be obtained by using an appropriate mathematical model and regressing the coefficients in the mathematical model according to the distillation curve of AET ≤700 ℃. Through the above methods, the distillation curve of heavy oil can be obtained relatively economically and accurately and can be used as the basis for process simulation.