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针对工业实际装置Spheripol-Ⅱ液相双环管聚丙烯反应器,从丙烯聚合反应动力学出发,根据物料平衡和能量平衡原理建立了反应器动态数学模型,并采用机理建模和经验建模相结合的方法得到熔融指数预报模型。考虑到装置是双环管串联的结构,给出聚合速率系数和夹套水换热系数的估计方法,并利用现场操作数据确定出上述模型参数。使用建立的模型对反应器进行仿真研究,分析主要操作条件的变化对浆液密度、反应温度和熔融指数等产生的影响。仿真结果表明所建模型能较好地反映双环管反应器的动态性能,对进一步先进控制策略的实施具有一定的指导意义。
According to the kinetics of propylene polymerization reaction, the dynamic mathematical model of the reactor was established according to the principle of material balance and energy balance, and the combination of mechanism modeling and empirical modeling was applied to the industrial actual device Spheripol-Ⅱ liquid phase double loop polypropylene reactor. Method to get the melt index forecasting model. Taking into account the structure of the device is a double loop in series, given the polymerization rate coefficient and jacket water heat transfer coefficient of the estimation method, and the use of field operation data to determine the model parameters. The established model was used to simulate the reactor and analyze the influence of the main operating conditions on the slurry density, reaction temperature and melt index. The simulation results show that the model can well reflect the dynamic performance of the double loop reactor, which is of guiding significance to the implementation of further advanced control strategy.