A Novel Parallel-Preheating Supercritical CO2 Brayton Cycle for Waste Heat Recovery from Offshore Gas Turbines: Energy, Exergy, and Economic Analysis Under Variable Loads
Dianli Qu, Jia Yan, Xiang Xu, Zhan Liu
TL;DR
A new supercritical CO2 power cycle is proposed for offshore gas turbines to recover waste heat, showing improved efficiency and cost savings.
Contribution
The novel parallel-preheating Brayton cycle (PBC) is introduced, offering enhanced performance for waste heat recovery on offshore platforms.
Findings
The PBC achieves a 27.9% higher power output and 41.4% better thermal efficiency than the simple cycle under full load.
The PBC reduces electricity generation cost by 21.23% compared to the simple cycle.
The PBC maintains high efficiency even at 30% load, with thermoelectric and exergy efficiencies of 30.54% and 35.43%.
Abstract
Supercritical carbon dioxide (SC-CO2) power cycles offer a promising solution for offshore platforms’ gas turbine waste heat recovery due to their compact design and high thermal efficiency. This study proposes a novel parallel-preheating recuperated Brayton cycle (PBC) using SC-CO2 for waste heat recovery on offshore gas turbines. An integrated energy, exergy, and economic (3E) model was developed and showed good predictive accuracy (deviations < 3%). The comparative analysis indicates that the PBC significantly outperforms the simple recuperated Brayton cycle (SBC). Under 100% load conditions, the PBC achieves a net power output of 4.55 MW, while the SBC reaches 3.28 MW, representing a power output increase of approximately 27.9%. In terms of thermal efficiency, the PBC reaches 36.7%, compared to 21.5% for the SBC, marking an improvement of about 41.4%. Additionally, the electricity…
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Taxonomy
TopicsThermodynamic and Exergetic Analyses of Power and Cooling Systems · Refrigeration and Air Conditioning Technologies · Carbon Dioxide Capture Technologies