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Operability Analysis of Two Conventional Integrated SOFC Plants with Direct Thermal Coupling Scheme

Eskandari Haghighi, Mohammad Sadegh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46727 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza
  7. Abstract:
  8. Integrated SOFC plants, because of the high efficiency and optimum energy consumption, are important processes that have many applications. According to the importance of these plants, their optimum operability and favorable operations are also very important. One of the ways to optimize the process performance is the suitable selection of the control structures. The objective of this project is to analyze the operability or inherent controllability of integrated SOFC plants in the absence of any controller. In this work, the controllability of the process have been investigated with using the output controllability index and the other indexes such as relative gain array, singular value and condition number numerically and graphically and the best control structure of the plants have been chosen. The desired integrated plants are two convenient plants that operate at 3.3 bar and consisted of components such as heat exchanger, combustion chamber, compressor and turbine. The plants have been simulated by MATLAB software in dynamic mode and output controllability index have been calculated by MATLAB software and Multi-Parametric Toolbox. After analyzing of different control structures and comparison of the controllability indexes it was concluded that the best control structures of two desired plants are in such a way that the fuel utilization factor should be controlled by current density, cell output temperature by auxiliary fuel, turbine inlet temperature by air flow and the total power of the system by fuel flow
  9. Keywords:
  10. Solid Oxide Fuel Cell (SOFC) ; Dynamic Simulation ; Control Structure ; Hybrid System ; Operability Index ; Integrated System ; Output Controllbility

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