Performance study of a supercritical CO<sub>2</sub> Brayton cycle coupled with a compressed CO<sub>2</sub> energy storage system for waste heat recovery of ship gas turbines under variable load conditions

Guo, Jing; Du, Jun; Li, Menghan; Zhang, Zongnan

doi:10.1039/d2se01319c

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…Their study has been carried out considering extreme ocean conditions, to highlight the Instabilities related to the rolling motion. Guo et al [24] proposed a WHR system based on the sCO 2 Brayton cycle, transcritical CO 2 cycle, compressed CO 2 energy storage, and thermal storage system. Results of their thermody-namic model highlighted that the thermal efficiency reaches 40%.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

2023

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Waste heat recovery (WHR) can represent a solution to improve the efficiency of ships’ propulsion, helping to exceed stringent greenhouse gas emission limits. This is particularly suitable in the case of propulsion based on gas turbines due to their medium-high temperature level of the exhaust gases. This study analyzes the performance of a hybrid energy grid, in which the heat is recovered by the exhaust gases of an aeroderivative gas turbine, a GE LM2500+, when the bottoming system is a supercritical CO2 gas turbine. Given the issues and peculiarities related to the onboard installation, where size and weight are fundamental concerns, six WHR schemes have been analyzed. They span from the simple cycle to partial preheated and regenerative, to a cascade layout in which an ORC system receives thermal power by the sCO2 GT. The influence of the seawater temperature on the performance of the hybrid energy system has been also considered. The energetic and exergetic performance comparison of the different schemes has been carried out by using the commercial software Thermoflex. The results showed that an increase in overall performance by up to 29% can be obtained and that the increase in seawater temperature can lead to a decrease in the overall performance.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

2023

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Analysis of multi-cascade CCHP system with gas turbine bypass extraction air energy storage

Guo

2023

Applied Thermal Engineering

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Thermodynamic analysis of combined power cycle, combining heat from a waste heat source with sub-cycles

Elbir

2023

THERM SCI

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Significantly increasing consumption and demand in conventional fossil energy sources require energy sources to be more efficient and sustainable. In this study, it is aimed to increase the efficiency of the systems by using thermodynamic cycles from waste heat sources. The designed system is aimed at increasing the efficiency of the system by adding sub-cycles of the waste heat of a gas turbine. The results analyzed with the engineering equation solver program, when all the cycles are combined, the system energy efficiency is 75% and the total exergy efficiency is 24%. Brayton cycle when the system is evaluated alone, the energy efficiency of the system is 65%, the exergy efficiency is 14%. The S-CO2 cycle system when the system is evaluated alone, the exergy efficiency is 23% and the exergy efficiency is 11%. The ORC system when the system is evaluated alone, the exergy efficiency is 19% and the exergy efficiency is 22%. Rankine system when the system is evaluated alone, the exergy efficiency is 17% and the exergy efficiency is 88%. Turbine inlet temperatures tend to decrease as the exergy destruction in the system also affects the subcomponents.

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Performance study of a supercritical CO₂ Brayton cycle coupled with a compressed CO₂ energy storage system for waste heat recovery of ship gas turbines under variable load conditions

Abstract: A novel waste heat recovery system with a supercritical CO2 Brayton cycle, transcritical CO2 Brayton cycle, compressed CO2 energy storage, and thermal storage system for gas turbine variable load conditions.

Cited by 3 publications

References 47 publications

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

Analysis of multi-cascade CCHP system with gas turbine bypass extraction air energy storage

Thermodynamic analysis of combined power cycle, combining heat from a waste heat source with sub-cycles

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Performance study of a supercritical CO2 Brayton cycle coupled with a compressed CO2 energy storage system for waste heat recovery of ship gas turbines under variable load conditions

Abstract: A novel waste heat recovery system with a supercritical CO2 Brayton cycle, transcritical CO2 Brayton cycle, compressed CO2 energy storage, and thermal storage system for gas turbine variable load conditions.

Cited by 3 publications

References 47 publications

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

Performance Analysis of WHR Systems for Marine Applications Based on sCO2 Gas Turbine and ORC

Analysis of multi-cascade CCHP system with gas turbine bypass extraction air energy storage

Thermodynamic analysis of combined power cycle, combining heat from a waste heat source with sub-cycles

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Product

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Performance study of a supercritical CO₂ Brayton cycle coupled with a compressed CO₂ energy storage system for waste heat recovery of ship gas turbines under variable load conditions