Comparative investigation on the supercritical carbon dioxide power cycle for waste heat recovery of gas turbine

2021 ◽  
Vol 228 ◽  
pp. 113670
Author(s):  
Bo Li ◽  
Shun-sen Wang ◽  
Keke Wang ◽  
Liming Song
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Gas Turbine ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Comparative Investigation ◽  
Power Cycle ◽  
Supercritical Carbon

Advanced Exergy Analysis of the Supercritical Carbon Dioxide Power Cycle for Waste Heat Recovery of Gas Turbine

2021 ◽  
Author(s):  
Bo Li ◽  
Shun-sen Wang ◽  
Liming Song
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Gas Turbine ◽  
Exergy Analysis ◽  
Waste Heat ◽  
Design Stage ◽  
Exergy Destruction ◽  
Technical Improvement ◽  
Power Cycle ◽  
Supercritical Carbon

Abstract In this paper, the supercritical carbon dioxide power cycle used to recover the waste heat of gas turbine is investigated by means of conventional exergy analysis and advanced exergy analysis. Firstly, the thermodynamic parameters of carbon dioxide cycle in design stage are determined by single-objective optimization with net power output as objective function. Then, conventional exergy analysis is carried out on the partial heating cycle under real, unavoidable and ideal conditions. After that, advanced exergy analysis, in which the exergy destruction is divided into endogenous / exogenous part and avoidable / unavoidable part is adopted to reveal the improvement potential of the system and illustrate the interaction among the components. According to the calculation results, a total amount of 3.55MW (47.33%) exergy destruction could be reduced by the improvement of component efficiency. Endogenous exergy destruction is higher than exogenous exergy destruction in all components. Based on the results of conventional exergy analysis, the high-temperature heater should be paid attention in order to reduce exergy destruction. However, according to the results of advanced exergy analysis, the technical improvement of turbine should be emphasized due to its high endogenous-avoidable exergy destruction. Meanwhile, for the components with high unavoidable exergy destruction, external systems should be employed to exploit the underutilized energy and enhance the system performance.

scholarly journals Design optimization of supercritical carbon dioxide (s-CO2) cycles for waste heat recovery from marine engines

2021 ◽  
pp. 1-44
Author(s):  
Md. J. Hossain ◽  
Jahedul Islam Chowdhury ◽  
Nazmiye Balta-Ozkan ◽  
Faisal Asfand ◽  
Syamimi Saadon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
State Models ◽  
Supercritical Carbon

Abstract The global climate change challenge and the international commitment to reduce carbon emission can be addressed by improving energy conversion efficiency and adopting efficient waste heat recovery technologies. Supercritical carbon dioxide (s-CO2) cycles that offer a compact footprint and higher cycle efficiency are investigated in this study to utilize the waste heat of the exhaust gas from a marine diesel engine (Wärtsilä-18V50DF, 17.55 MW). Steady-state models of basic, recuperated and reheated s-CO2 Brayton cycles are developed and optimised for net work and thermal efficiency in Aspen Plus to simulate and compare their performances. Results show that the reheated cycle performs marginally better than the recuperated cycle accounting for the highest optimised net-work and thermal efficiency. For the reheated and recuperated cycle, the optimized net-work ranges from 648–2860 kW and 628–2852 kW respectively, while optimized thermal efficiency ranges are 15.2–36.3% and 14.8–35.6% respectively. Besides, an energy efficiency improvement of 6.3% is achievable when the engine is integrated with an s-CO2 waste heat recovery system which is operated by flue gas with a temperature of 373 °C and mass flow rate of 28.2 kg/s, compared to the engine without a heat recovery system.

Optimal structure design of supercritical CO2 power cycle for gas turbine waste heat recovery: A superstructure method

2021 ◽  
Vol 198 ◽  
pp. 117515
Author(s):  
Chendi Yang ◽  
Yuanyuan Deng ◽  
Ning Zhang ◽  
Xiaopeng Zhang ◽  
Gaohong He ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Supercritical Co2 ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Structure Design ◽  
Optimal Structure ◽  
Power Cycle
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