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Simulation, Optimization and Control of Reactive Batch Distillation Column - for Ethyl Acetate Synthesis

出版	Curtin University of Technology., 2006
URL	http://books.google.com.hk/books?id=COVmNQAACAAJ&hl=&source=gbs_api

註釋The optimum operating profiles derived from the dynamic simulations conclude that the production rate of ethyl acetate is maximum, when the column is operated at optimum reflux ratio of approximately 0.875 and the optimum batch time is fixed between 8.3 to 8.6 hrs. At times, steady and consistent behaviour could not be evaluated for a couple of simulation runs as a result of complexity arising due to highly unsteady and nonlinear reactive batch distillation dynamics. In the second part of the thesis, model based linear and nonlinear control analysis studies are performed on a reactive hatch distillation column producing ethyl acetate from acetic acid and ethanol. To achieve this, model based proportional-integral-derivative (PID), dynamic matrix control (DMC) and nonlinear model predictive controllers (NMPC)are designed and applied to the process model using SIMULINK toolbox in MATLAB'. First-order plus dead time (FOPDT) model was used to perform step response analysis for these control applications. The performance and robustness of these controllers is evaluated through repeated simulations. Specifically, control configurations with various tuning parameters such as proportional gain (KC), integral time (TI), derivative time (TD) for PID controllers, move suppression factors (q), prediction horizons (NP) for DMC and NMPC are derived and analysed with the aim of achieving the desired control objective. For an individual run, different tuning combinations are applied and the results are plotted in terms of the effect of reflux flow rate (a key manipulated input) on the specified product purity (a key controlled output), instantaneous distillate composition, average distillate composition, ethyl acetate produced, capacity factor (Pcap) and batch time.