احمدرضا شفيعي

After the energy crisis in the 1970s, the study of reactive distillation processes in a single column instead of using the conventional methods of reaction an‎d separation separately has been one of the activities carried out in the field of energy saving. The integration of reaction an‎d separation in a single column has many advantages in terms of economy, environment an‎d safety, but the control of these processes is very difficult due to the creation of a nonlinear an‎d complex system. The controllability of chemical processes helps to improve productivity, reduce waste an‎d increase the quality of products. Therefore, in this study, with the aim of integrating design an‎d control in the design stages of these processes, a quantitative controllability index has been introduced to help designers find the best possible process an‎d control structure. The index presented in this study is able to simultaneously reflect the effect of the process structure, the control structure at the plant level, the quality of the dynamic response, an‎d the economic consequences in the form of a numerical value. The key features of this index are the focus on the level of product quality, product quantity, an‎d the effect of process disturbances on it, the combination of the economics of the dynamic state an‎d the control performance of the dynamic state of the process, an‎d finally the use of dynamic mathematical tools for system analysis. This index analyzes the behavior of the plant level control structure well, along with economic issues, by using a geometric combination of dynamic parameters of advection, settling time, weighted integral error index with respect to time, an‎d the duration of out-of-range behavior.In this study, the ethyl acetate production process with four process alternatives was used to prove the pragmatism of this index, an‎d the controllability index for the structures was calculated through an algorithm. At the end of this study, the reactive distillation process structure with a side reaction with an index of 0.55 compared to the indices of the other structures, all of which were values in the range of zero an‎d one, was introduced an‎d selec‎ted as the best structure among the proposed structures for ethyl acetate production by the Pishhadhi controllability index. Since the performance of the sugars was investigated with the index value, the best performance was an index value of one an‎d the worst performance was an index value of zero, the proposed index has shown its application in improving an‎d modifying the process an‎d control structure well. In fact, the results have shown that the presented index depends on the eva‎luation time horizon, the type an‎d number of applied disturbance scenarios, an‎d the adjustment of the controllers, an‎d achieving values close to one for the index means optimal performance for dynamic an‎d economic parameters.

كنترل‌پذيري , فرايند تقطيرواكنشي , شاخص كنترل‌پذيري كمي , شاخص عملكردي فرايند , كنترل فرايند

Controllability , Reactive Distillation , Quantitative Controllability index , Process Control

Ahmadreza Shafiei

Dr. Norolah Kasiri