Proposition of Control Structure for DME Synthesis Plant

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Jahan Afrooz, Amir Mahdi | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51345 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Pishvaie, Mahmoud Reza
Abstract:
The development and use of design methods for control structures has grown significantly in recent decades. In this study, a systematic plantwide control procedure proposed by Skogestad, has been used. The main idea of suggested method is based on the self-optimizing variables. One of the advantages of this method of designing a control structure is considering the economic optimization of the process in most stages of its implementation. The indirect and direct dimethyl ether synthesis from natural gas feed have been investigated in this study. In this research, indirect and direct dimethyl ether synthesis processes are simulated with Aspen Plus V10 and degree of freedom analysis is done. Given the number of degrees of freedom, and the economic profit function, the controlled variables are selected and paired with suitable manipulated variables. To control the performance of the designed control structure, imminent disturbances (such as feed rate change) have been applied. According to obtained simulation results, the control structures designed for both processes have a good performance
Keywords:
Dynamic Simulation ; Plantwide System ; Direct Dimethyl Ether Synthesis Process ; Indirect Dimethyl Ether Synthesis Process ; Self-Organizing Variables

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