Performance enhancement of semi-closed cycle gas turbines by aqueous glycol direct contact chilling
Başlık çevirisi mevcut değil.
- Tez No: 402888
- Danışmanlar: DR. WILLIAM E. LEAR
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: University of Florida
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 76
Özet
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Özet (Çeviri)
A PoWER variant consisting of the HPRTE semi-closed cycle gas turbine, VARS, and glycol cycle was modeled by using zero-dimensional steady state thermodynamics. The VARS was modeled using a second law efficiency approach. Two cases were considered: a medium size and a small engine. In contrast to previous studies, all of the refrigeration capacity was used to cool the high pressure compressor inlet to below ambient temperature. Cooling of the gas was provided by the VARS system both directly and indirectly. Final drying of the gas flow and depression of the temperature below freezing were accomplished by a direct contact spray chamber. The VARS cycle was operated on the usable waste heat of the semi closed gas turbine cycle. A thermodynamic model was developed for the complete system, and parametric results were generated. The following are conclusions drawn from this analysis: The medium size engine with 14% blade cooling has a predicted efficiency of 47.8% without spray cooling. Spray cooling raises system efficiency up to 50%. The small engine with 14% blade cooling of the compressed air has an efficiency of 34.8% without spray cooling. Spray cooling raises system efficiency up to 37.5%. Spray cooling results in a greater system efficiency increase for the small engine than for the medium size engine. Spray cooling provides a flatter maximum efficiency peak for both sizes. For different ambient conditions, the spray cooled system efficiency is insensitive to ambient temperature for both small and medium size engines. So the system can be run under these conditions with stable performance even while the temperature during a particular day changes. Increasing temperature at the exit of the burner always has a positive effect on system efficiency, whereas recuperator inlet temperature exhibits an optimal value. Spray cooling becomes useless after that peak value since the system does not have much available waste heat. 63 The temperature at the inlet of the high pressure compressor drops to around -13°C for both small and medium size engines for given base case conditions. This temperature is very sensitive to input parameters which are recuperator inlet temperature, burner exit temperature, and generator exit temperature. The solution mass flow rate must be determined by considering both the cooling effect of the spray chamber and the freezing point of the solution. The higher mass flow rates decrease the efficiency gain of the system, however, the solution does not freeze as easily. Mass flow rate must be selected based on the design point of the system. If the design point promises more available waste heat, then higher solution mass flow rates can be used.
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