Abstract:

The refinery short-cut column model plays an important role in the practical application of refinery production scheduling. As the traditional short-cut model does not conform to the actual assumptions, it cannot reflect the true nonlinear property of the product distillation curve. In this study, a refinery short-cut column model based on separation factor was developed. The separation process of the oil refining column was simplified as continuous separation unit by using the relationship between the degree of component separation and the boiling point, and the nonlinear degree of the model was reasonably improved. The model could satisfy the two calculation modes of given cutting point or yield. Based on parameters such as cutting temperature or yield and separation factor, the secant method was used to solve iteratively, which could better simulate the incomplete separation process near the cutting point of the product. The model was verified by an example of the atmospheric and vacuum process. The results showed that the relative deviation between the calculated values of main process indexes and the actual values was within 5%, which proved that the developed model could effectively simulate the refinery column production process.

Key words: refinery short-cut column model, planning and scheduling, crude distillation unit, separation, simulation

摘要：

简捷炼油塔模型在炼油厂生产调度实际应用具有重要作用，但传统简捷模型不符合实际的假设，无法反映产品蒸馏曲线的真实非线性性质。本研究开发出一种基于分离因数的简捷炼油塔模型。首先，针对炼油塔分离过程，利用组分分离程度与沸点之间关系，将炼油塔分离过程简化为连续分离单元，合理地提高模型的非线性程度。其次，模型可以满足给定切割点或产率两种模式计算，基于切割温度或产率、分离因数等参数，采用割线算法迭代求解，较好地模拟在产品切割点附近组分不完全分离过程。最后，通过常减压过程实例进行模型验证，主要工艺指标计算值与实际值相对偏差均在5%以内，证明开发的模型能够较好地模拟炼油塔生产过程。

关键词: 简捷炼油塔模型, 生产调度, 常减压装置, 分离, 模拟