Development and Application of the Polymerization System with Fuzzy Temperature Control for Highly Viscous and Eexothermal Polymerization

在本研究中，我们开发了一个在垂直方向上有五个冷却盘管的间歇式聚合反应器。有十六个热电偶来测量反应器中的温度分布。每个热电偶的温度值被发送到微电脑。微型计算机根据适当的控制理论计算每个冷却盘管的操作值，该控制理论是“模糊”或“模型预测”等。本文首先研究了聚合反应器内温度分布与聚合物性能的关系，发现当反应液粘度较高时，开关控制和PID控制反应器不能进行温度控制。而模糊控制反应器和模型预测反应器具有通过反应时间的控制能力。模糊控制反应器和模型预测反应器生产的聚合物分子量分布比其他控制反应器的聚合物分子量分布窄。在对模糊控制反应器和模型预测控制进行比较的情况下，模型预测控制效果更好。由于模型预测控制不需要模糊控制中必不可少的模糊常数的调整，因此本研究开发了具有多个控制系统的间歇聚合反应器的数值模拟器。该模拟器可计算任意时刻反应器内的三维速度、温度分布、单体转化率分布和聚合物分子量分布。

In this study, We developed a batch polymerization reactor which have five cooling coils in the vertical direction. There are sixteen thermocouples to measure temperature distribution in the reactor. The temperature value from each thermocouples are sent microcomputer. The microcomputer calculated operation values for each cooling coils based on a suitable control theory, which is 'fuzzy' or 'model prediction' etc..We investigated the relationship temperature distribution in the polymerization reactor and the properties of produced polymers at first.As a result, We found that on-off control reactor and PID control reactor could not temperature control when reaction fluid was high viscosity. But the fuzzy control reactor and the model prediction reacter had control capacity through the reaction time. And produced polymers from the fuzzy control reactor and the model prediction reactor had a narrower molecular weight distributions then the other control reactor. In the case of compared the fuzzy control reactor with the model prediction control, the latter one was better. Because model prediction control was not necessary adjustment of fuzzy constants which is indispensable operation in fuzzy control.In this study, we developed the numerical simulator for batch polymerization reactor with several control system. This simulator was calculated three dimensional velocity, temperature distribution, monomer conversion distribution in reactor and molecular weight distribution of produced polymer at any time.