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Plant-Wide Control of an Integrated Molten Carbonate Fuel Cell (MCFC) Plant

Davoodi, Amir Hossein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45300 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza
  7. Abstract:
  8. Molten carbonate fuel cell (MCFC) is a kind of high operating temperature fuel cells (600-800℃), tupically used for stationary power plant. These fuel cells have high efficiency (about 50%), but expensive to produce electricity. Hence, fuel cells are integrated into gas turbine cycle to decrease cost and increase efficiency of system. In this work, an integrated pressurized molten carbonate fuel cell is selected. Then, structure of selected process is changed and two new systems have proposed. Then, steady-state and dynamic behaviors of three systems were simulated separately, and their performances were compared. Efficiency increased about 5% in two new structures. Total power of system, temperature of fuel cell, turbine inlet temperature and fuel utilization were selected as process variables, and flow of air, flow of fuel, current density and flow of auxiliary fuel were considered as manipulated variables. Afterward, relative gain array (RGA) analysis was done for three systems to determine control structure. Proportional integral (PI) controller that tuned by Ziegler-Nichols method was used to control the system. At the end, performances of three systems are investigated for setpoint tracking and load rejection. Results showed that the proposed control structures for three systems are suitable. A detailed model of hybrid system is simulated in MATLAB-Simulink
  9. Keywords:
  10. Molten Carbonate Fuel Cell ; Control Structure ; Hybrid System ; Integrated System ; Plantwide System ; Dynamic Simulation

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