摘要
精馏过程的模型化与仿真在化工操作和工艺设计中具有重要的意义。对精馏塔进行动态数学模型的建立与仿真,不仅可以研究精馏过程在不同工况下的变化情况,而且还可以用于精馏塔的优化控制,进而提高精馏过程的生产效益。本文针对精馏塔操作过程,建立了基于平衡级假设和非平衡级假设的精馏过程动态机理数学模型,并对平衡级假设的模型进行了动态模拟。该模型从机理分析入手,进行合理的简化,模型的计算时间大大的缩短,从而使模型具有比较广泛的实用性。该模型采用的动态数学模型为METSH(质量平衡方程、相平衡方程、塔板效率方程、摩尔分数归一化方程、能量平衡方程)方程,通过计算METSH方程,可以模拟出精馏塔内温度、汽相流量、液相流量、汽相组分以及液相组分的变化趋势。通过仿真结果可以看到,该模型比较准确的预测了精馏塔中各个操作参数的动态趋势,与实际情况基本一致,其稳态结果与实际情况也基本吻合。该模型对于仿真培训及精馏过程的控制分析具有较高的理论研究意义和实际应用价值。
The modeling and simulation of distillation process is great important on chemical technological design and operation. The foundation and simulation of the dynamic mathematical model on the distillation column can not only study the changes of distillation process in different conditions, but also can be used for optimal control, furthermore it can improve economic benefits of distillation process. A precise dynamic mechanism mathematical model based on assumptions about the equilibrium and non-equilibrium is set up for the distillation process. And simulate the equilibrium stage model. Starting from the mechanism analysis, the computing time is greatly shorted by reasonable simplifying the model and the model has a wider relevance. METSH equations （material equation, phase equilibrium equation, tray efficiency equation, summation equation, heat equation） are introduced in this mathematical model. By calculating the METSH equations, we can understand the trend of temperature, the vapour and liquid flow rates, the component eompositation of vapour and liquid phases in a distillation. From the simulation results, we can see the model can predict the dynamic trend accurately. The steady state results are consistent with the actual situation. Therefore, the model has a high theoretical significance and practical value for simulation training and the analysis of control system.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2011年第9期1219-1223,共5页
Computers and Applied Chemistry
关键词
精馏塔
塔板效率
数学模型
MESH方程
distillation column, tray efficiency, mathematical model, METSH equation
