การควบคุมอุณหภูมิของเครื่องปฏิกรณ์การเกิดโพลิเมอร์แบบอีมัลชันโดยใช้เจเนริกโมเดลคอนโทรเลอร์ / สุณี นิธิกาญจนธาร = Temperature control on an emulsion polymerization reactor by a generic model controller / Sunee Nithikanjanathran
Emulsion polymerization reactions of acrylic emulsion in a semi-batch reactor are highly exothermic reactions and heat of reaction is released continuously. After monomer is initially feeding, temperature is increased over set point and temperature overshoot occurs. The production of acrylic emulsion normally gives fouling on surface area of reactor, therefore heat transfer between reactant in the reactor and cooling water in the jacket is decreased. Presently, a PID controller is applied to control the temperature of an emulsion polymerization reactor, but the performance of the PID controller process control may be poor particularly in the presence of plant/model mismatch The thesis presents of the application of Generic model control (GMC) to control the temperature of an emulsion polymerization reactor. Since the GMC is a model-based controller, it needed states and parameters of a system to determine control action. Therefore, an estimation technique is incorporated into the GMC control formulation to estimate unmeasurable state and unknown/uncertain parameters. In this thesis, an on-line heat released estimator is used to estimate the heat released of the reactions. Simulation, shown that the GMC with the estimator gives better control performance than that of the PID controller. Furthermore, the GMC is much more robust than the PID in the presence of plant/model mismatch in rate of reaction, heat transfer coefficient and monomer feed rate mismatch.
