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Numerical Simulation to Improve the Efficiency of a Combined Cycle Incorporating a J-Class Gas Turbine Equipped with a Water Fogging System at Its Inlet

Babaei, Mohammad Aref | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55722 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. One way to increase the power and efficiency of the gas turbines is to cool their incoming air. There are different methods to cool down the inlet air. One of the most widely used and suitable method is spraying or fogging the water droplets into the air at the gas turbine air inlet. In this research and for the first time, the effect of fogging system on the performance of a combined cycle incorporated with a J-class gas turbine (M-501J) is investigated using the computational fluid dynamics (CFD). There are so many parameters, which affect the amount of achieved efficiency. A few of them includes the average temperature and humidity at the outlet, the evaporation efficiency of the water droplets, the temperature distortion, and the diameter of the outlet droplets. As a novel contribution, this research studies the effect of number of fogging nozzles, the changes in the injected water flow rates, the distance of spraying location from the inlet, the arrangements of injectors, and different injection angles on the achieved efficiency separately. After finding the most suitable fogging system with the highest possible efficiency, a combined cycle with two J-class gas turbines are modeled using the Thermoflow software. The results of performed simulations show that the use of optimum fogging system designed in this research can increase the output power of each gas turbine up to 9.44%, which is equivalent to 26.2 MW. This in turn can increase the output power of the entire power plant by 7%, which is equivalent to 58.7 MW.
  9. Keywords:
  10. Gas Turbines ; Fogging System ; Combined Cycle Power Generation ; Computational Fluid Dynamics (CFD) ; Air Inlet ; Spray Droplets ; Spray Cooling

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