Preliminary System Design and Off-Design Analysis for a Gas Turbine and ORC Combined Cycle
Publication: Journal of Energy Engineering
Volume 143, Issue 5
Abstract
Organic Rankine cycle (ORC) is a more efficient way to recover exhaust heat from medium- and small-scale gas turbines than conventional steam power cycles. Plate-fin heat exchangers (PFHEs) were applied as the evaporator and recuperators because gas-liquid and gas-gas heat transfers occurred. This study focused on the preliminary system design and off-design analysis of the gas turbine (GT)–ORC combined cycle. Therefore, optimum-rated parameters for the ORC and geometric parameters for the PFHEs were designed first. Based on the established off-design model and constant pressure control approach, off-design simulations were done and results showed that the combined cycle efficiency decreased monotonically with the decline of GT load. However, the ORC still had good performance and played a more important role in the combined cycle under low-load conditions. Moreover, sensitivity simulations concluded that the ambient temperature impacted the combined cycle performance mainly by the gas turbine under high-load conditions and the ORC under low-load conditions. In addition, the ORC had better performance with higher ambient temperature. This model can provide reference parameters for detailed design of the GT-ORC combined cycle and predict its off-design performance under variable conditions.
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Acknowledgments
The authors gratefully acknowledge the financial support by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130201110037) and the National High-Tech Research and Development Program (Grant No. 2012AA053002).
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Published In
Journal of Energy Engineering
Volume 143 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 22, 2016
Accepted: Mar 8, 2017
Published online: Jun 21, 2017
Published in print: Oct 1, 2017
Discussion open until: Nov 21, 2017
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