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Improvement of a Steam Turbine Performance in a Combined Power Cycle Benefiting from Aerodynamics Solutions Applied on its Air-Cooled Condenser

Khorshidi Behzadi, Hamid Reza | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50344 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Air-cooled condenser is widely used in thermal power plants as its main cooling system. However, the thermal capacity of air-cooled condensers reduces considerably in environmental wind drafts. So, the purpose of this study is to find practicable solutions to minimize the mal-performance of air-cooled condensers in windy conditions in either design or off-design conditions and consequently prevent the related steam turbines power reduction. The target combined cycle power plant consists of 4*160 MW steam turbines and 4 air-cooled condensers in its steam cycle part. This research presents two general and practical remedies, which are also applicable to many different powerplants irrespective of their locations and atmospheric conditions. One is to add screen wall under the air-cooled condenser level and the other one is to increase the air flow rate of some specific fans among the entire assembly of fans. To evaluate the effect of these solutions on improving the condenser performance in bad environmental conditions, we use the CFD simulations. Additionally, we benefit from the CFD results and extend 1D air-cooled condenser models to investigate the effects of improved performance of air-cooled condenser on the general performance of the turbine in its attributed steam power cycle. Based on the achieved results in this study, an increase in the blade angles of some fans can suitably increase the air flow rate through those fans. This study quantifies the required increases in blade angle magnitudes, which can be different from one fan to its adjacent fan. This study shows that this remedy is an effective solution, which not only improves the performance of air-cooled condenser but also improves the performance of steam turbine in the related power cycle. The study quantifies that in different ambient conditions, the installed screen walls results in 15 to 38 MW improvement in condenser heat load and consequently in 2 to 16 MW improvement in steam turbine power production. Additionally there will be about 53.5 to 99.5 MW improvement in the performance of condenser if the blades pitch angle are adjusted properly. In such conditions, there will be about 7.5 to 42.5 MW boost up in the power generation of the related steam turbines
  9. Keywords:
  10. Air Cooled Condenser ; Computational Fluid Dynamics (CFD) ; Steam Turbines ; Combined Cycle Power Generation ; Thermohydrodynamic Simulator

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