Potential of regenerative gas-turbine systems with high fogging compression

The study of evaporatively-cooled cycles is of interest because of the prospect of enhanced efficiencies and conceptual simplicity that can lead to low capital costs. This work focuses on a cycle that relies on continuous cooling of the air under compression, followed by recuperation of residual exh...

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Bibliographic Details
Published inApplied energy Vol. 84; no. 1; pp. 16 - 28
Main Authors Kim, Kyoung Hoon, Perez-Blanco, Horacio
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 2007
Elsevier Science
Elsevier
SeriesApplied Energy
Subjects
Applied sciences
Compressor cooling
Droplet evaporation
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Gas-turbine cycle
Regenerative Brayton-cycle
Water injection
Water injection Droplet evaporation Wet compression Gas-turbine cycle Regenerative Brayton-cycle Compressor cooling
Wet compression
Water injection
Compressor cooling
Wet compression
Gas-turbine cycle
Droplet evaporation
Regenerative Brayton-cycle
Compression
Brayton cycle
Evaporation
Regenerative process
Efficiency
Cooling system
Gas turbine
Regenerative Brayton- cycle
Cost lowering
Fog
Capital cost
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Summary:The study of evaporatively-cooled cycles is of interest because of the prospect of enhanced efficiencies and conceptual simplicity that can lead to low capital costs. This work focuses on a cycle that relies on continuous cooling of the air under compression, followed by recuperation of residual exhaust heat, combustion and expansion. Ideal gases are modeled, with realistic values of efficiencies, air-to-fuel ratios and turbine-inlet temperatures. As the amount of water injected in the compressor increases, the efficiency of the cycle peaks at progressively higher pressure-ratios. The pressure ratio and the recuperator effectiveness are important parameters for cycle efficiency. Compared to a dry cycle with no recuperation with a pressure ratio of 25, the efficiency can increase from 45% to 51.5% and the specific work from 410 kJ/kg to 680 kJ/kg when compression cooling and recuperation are implemented.
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2006.04.008