Abstract
Many researchers have considered externally fired gas turbines (EFGT) as an option for the implementation of biomass-fueled power plants. The EFGT cycle with regeneration or the gas-vapor combined cycle using one EFGT, also known as externally fired combined cycle (EFCC), could lead to significant efficiency improvements if compared to current technology used for power generation from biomass. This work presents one improved numerical model used for the simulation of EFGT cycle. The results were obtained with a numerical model for the EFGT cycle coupled with a model for the high temperature heat exchanger (HTHE) that is necessary for the cycle implementation. The model of the heat exchanger is based in correlations for the Colburn and friction factors, obtained with CFD simulations. In previous work, the model included only laminar regime for the heat exchanger. The present work extends the correlations that describe the behavior of the heat exchanger to turbulent and transitional regimes. The updated model of the EFGT cycle is used to investigate the influence of the turbine inlet temperature over the cycle efficiency. The results obtained confirm that the pressure drop caused by the heat exchanger is one important parameter that influences the cycle efficiency. The feasibility of the EFGT cycle is discussed taking into consideration that the highest temperature in EFGT cycle is not in the turbine inlet, but in the high temperature heat exchanger.
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Acknowledgements
The authors would like to acknowledge Centro Universitário da FEI and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the research support.
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Nomenclature
Nomenclature
- a:
-
Plate thickness (m)
- Afr :
-
Exchanger total frontal area (m2)
- b:
-
Plate spacing (m)
- Dh :
-
Hydraulic diameter (m)
- f:
-
Friction factor
- G:
-
Exchanger flow stream mass velocity (kg/s m2)
- h:
-
Enthalpy (kJ/kg)
- j:
-
Colburn factor
- L1 :
-
Exchanger external core dimension perpendicular to the flow (m)
- L2 :
-
Exchanger external core dimension perpendicular to the flow (m)
- L3 :
-
Exchanger external core dimension in the flow direction (m)
- mair :
-
Air mass flow (kg/s)
- mexaust :
-
Exaust mass flow (kg/s)
- NTU:
-
Number of transfer units
- P:
-
Pressure (Pa)
- q:
-
Heat transferred in recuperator (kJ/kg)
- Qcc :
-
Heat supplied in combustion chamber (kJ/s)
- Re:
-
Reynolds number
- U:
-
Overall heat transfer coefficient (W/m2 K)
- v:
-
Specific volume (m3/kg)
- V:
-
Volume of the heat exchanger (m3)
- We :
-
Electric net work output (W)
- Wnet :
-
Mechanical net work output (W)
- α:
-
Ratio of total transfer area of one side of exchanger to total exchanger volume (m2/m3)
- β:
-
Ratio of total transfer area of one side of exchanger to volume between plates (m2/m3)
- ε:
-
Effectiveness
- ηEG :
-
Efficiency of electric generator
- ηel :
-
Net electric efficiency
- μ:
-
Dynamic viscosity (kg/m s)
- πC :
-
Pressure ration in compressor
- πT :
-
Pressure ration in turbine
- σ:
-
Ratio of free-flow to frontal area of one side of exchanger
- act:
-
Actual
- c:
-
Cold
- f:
-
Fin
- h:
-
Hot
- max:
-
Maximum
- min:
-
Minimum
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de Mello, P.E.B., Scuotto, S., Ortega, F.d.S., Donato, G.H.B. (2014). Influence of Turbine Inlet Temperature on the Efficiency of Externally Fired Gas Turbines. In: Dincer, I., Midilli, A., Kucuk, H. (eds) Progress in Sustainable Energy Technologies Vol II. Springer, Cham. https://doi.org/10.1007/978-3-319-07977-6_6
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DOI: https://doi.org/10.1007/978-3-319-07977-6_6
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