NDLI: Investigation of the Bottoming Cycle for High Efficiency Combined Cycle Gas Turbine System With Supercritical Carbon Dioxide Power Cycle

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cho, Seong Kuk Kim, Minseok Baik, Seungjoon Ahn, Yoonhan Lee, Jeong Ik
Copyright Year	2015
Abstract	The supercritical CO2 (S-CO2) power cycle has been receiving attention as one of the future power cycle technology because of its compact configuration and high thermal efficiency at relatively low turbine inlet temperature ranges (450∼750°C). Thus, this low turbine inlet temperature can be suitable for the bottoming cycle of a combined cycle gas turbine because its exhaust temperature range is approximately 500∼600°C. The natural gas combined cycle power plant utilizes mainly steam Rankine cycle as a bottoming cycle to recover waste heat from a gas turbine. To improve the current situation with the S-CO2 power cycle technology, the research team collected various S-CO2 cycle layouts and compared each performance. Finally, seven cycle layouts were selected as a bottoming power system. In terms of the net work, each cycle was evaluated while the mass flow rate, the split flow rate and the minimum pressure were changed. The existing well-known S-CO2 cycle layouts are unsuitable for the purpose of a waste heat recovery system because it is specialized for a nuclear application. Therefore, the concept to combine two S-CO2 cycles was suggested in this paper. Also the complex single S-CO2 cycles are included in the study to explore its potential. As a result, the net work of the concept to combine two S-CO2 cycles was lower than that of the performance of the reference steam cycle. On the other hand, the cascade S-CO2 Brayton cycle 3 which is one of the complex single cycles was the only cycle to be superior to the reference steam cycle. This result shows the possibility of the S-CO2 bottoming cycle if component technologies become mature enough to realize the assumptions in this paper.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856802
DOI	10.1115/GT2015-43077
Volume Number	Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Cycles Temperature Combined cycle gas turbines Cascades (fluid dynamics) Thermodynamic power cycles Brayton cycle Flow (dynamics) Pressure Heat recovery Exhaust systems Supercritical carbon dioxide Gas turbines Power systems (machinery) Steam Rankine cycle Teams Thermal efficiency Waste heat Turbines Combined cycle power stations Natural gas
Content Type	Text
Resource Type	Article

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