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Economic Model Predictive Control of a Multiproduct CSTR Based on Elementary Reactions

Soofi, Vahid | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56454 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vafa, Ehsan
  7. Abstract:
  8. One of the model based control strategies that has been proposed in recent years for the control of process systems is the one based on the economic models, in which objective functions with an economic basis are used along with the equations and constraints to perform control calculations. In this work, the control of a multiproduct continuous stirred reactors is discussed, in which, it is possible to produce different products based on changes in the market demand, the price of the products or the primary raw materials according to a specific schedule. One of the recently used methods is the economic predictive control method based on the Lyapunov function. In this method a quadratic Lyapunov function is used to define a constraint to guarantee the stability of the system within a certain range of operating conditions, in addition to driving the states of the closed loop system to their steady state values. In this work, based on the simulation studies, the EMPC strategy has been implemented and its performance has been investigated in three different cases for the control of continues stirred tank reactors: 1- in the presence of average constraints on the total amount of reactive substance that can be added to the reactor, 2- economic model predictive control based on the Lyapunov function for a continuous reactor based on non-elementary reactions with a specific production schedule, 3- control of a polymerization reactor based on elementary reactions using the Lyapunov-based economic model predictive control with a specific production schedule to produce two different polymer grades. The simulation results show that the LEMPC has better performance in driving the state variable to their set point values in comparison to the conventional method. In addition, the results show that under LEMPC control strategy less amount of heat is used which is economically valuable
  9. Keywords:
  10. Lyapunov Function ; Continous Stirred Tank Reactor (CSTR) ; Economic Model Predictive Control (EMPC) ; Schedule Management ; Primary Reactions

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