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Developing Advanced Models to Simply Simulate the HRSG of Class F Turbine in Full Scale

Mohammad, Ali | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54595 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Todays, heat recovery steam generator (HRSG) systems are used extensively in combined power plant cycles (consisting of Rankine cycles and Brighton gas cycle) to maximize their efficiencies. The role of HRSG is essential in providing additional energy needed in the steam cycle part. The HRSG has many pipes or harps. They recover the heat from the incoming gas from the gas turbine outlet, which may be boosted up by the duct burner unit. The main challenge in simulating heat recovery units such as tube bundles is to provide ultra-large and cost-efficient grids. In such situations, alternative models are used to simplify the simulation of the steam generator in full scale, including the replacement of porous media in the position of different tube bundles in the HRSG; which need to use empirical correlations in terms of pressure drop and heat transfer parameters. The CFD simulation can be used to extract numerical correlations. In this research, to simulate a pipe harp, the HRSG unit of Yazd Thermal Power plant is selected as the test case, and the necessary investigations on the second tube bundle modules is done. In practice and during the simulation, another serious challenge was confronted in this research. The previous scientific resources did not simulate the tube bundles properly with different fin pitch values in adjacent rows. This research tries to introduce two methods called the unified domain and the separated domain, respectively. This study leads to the most proper one. The results show that the flow parameter, specifically those related to pressure drop, does not perform well in the solutions presented by the unified domain. The cross-sections that appear due to a change in the height of the fluid domain lead to some inconsistency in the results. At the end, employing the selected solution or so-called separated domain, the operating conditions of the HRSG of an F-class gas turbine are considered at the input boundary of the domain, and the relevant numerical correlations will be displayed. They have the ability to apply in porous media, which can replace with the full scale harps in the HRSG
  9. Keywords:
  10. Boilers ; Furnaces ; Heat Transfer ; Periodic Boundary Condition ; Pressure Drop ; Numerical Simulation ; Computational Fluid Dynamics (CFD) ; Heat Recovery Steam Generator ; Tube Banks

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