Design and thermodynamic analysis of a combined system including steam Rankine cycle, organic Rankine cycle, and power turbine for marine low-speed diesel engine waste heat recovery

Qu, Jinbo; Feng, Yongming; Zhu, Yuanqing; Zhou, Song; Zhang, Wenping

doi:10.1016/j.enconman.2021.114580

Cited by 33 publications

(5 citation statements)

References 26 publications

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“…Similar to the Brayton cycle, an extra power turbine separated by a valve from the part of the exhaust gases going to the turbocharger is used to generate extra power by expanding the part of the exhaust gas that is left over from the compressor drive and disposed of as a bypass (Qu, Feng, Zhu, Zhou, & Zhang, 2021). On this occasion, in ships with space problems, additional power is provided to the shaft or used by adding only one turbine.…”

Section: Brayton Cyclementioning

confidence: 99%

A literature survey on exergy analyses of marine diesel engine and power systems

GÖKSEL¹

2022

Seatific

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The oil crisis in the world has led countries to seek an alternative fuel that can replace fossil fuels. In addition, the fact that global warming, which is one of the most important problems for the world, has reached significant levels, has led to an increase in studies on greenhouse gas emissions and the efficient use of energy. Every effort to increase efficiency contributes to both environmental and economic improvements. Considering this situation, the study was compiled by examining the studies on energy and exergy analysis related to diesel engines and marine diesel power systems in the literature. As a result of the study, it has been seen that the use of different fuel types contributes significantly to the decrease in environmental emissions as well as the increase in efficiency in diesel engines. In addition, it is thought that there are few studies in the literature on ship diesel engines, and with the increase in the studies to be done on this subject, there may be important references to both companies engaged in maritime transport and studies that will conduct research on this subject.

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Section: Brayton Cyclementioning

confidence: 99%

A literature survey on exergy analyses of marine diesel engine and power systems

GÖKSEL¹

2022

Seatific

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“…Under the condition of a load of 100%, the total power generation reached 1079.1 kW. Among them, the maximum thermal efficiency and exergy efficiency of the SRC-ORC unit occurred at 90% load and the maximum thermal efficiency and exergy efficiency of the SRC-ORC unit occurred at 90% load, which reached 28.5% and 65.7%, respectively [42]. Baldasso et al explored the design of an ORC system for recovering exhaust gas waste heat, concluding that design units with a minimal pinch point temperature approach could result in unfeasible WHR boiler designs [43].…”

Section: Introductionmentioning

confidence: 99%

Complex Use of the Main Marine Diesel Engine High- and Low-Temperature Waste Heat in the Organic Rankine Cycle

Lebedevas,

Čepaitis

2024

JMSE

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The decarbonization problem of maritime transport and new restrictions on CO2 emissions (MARPOL Annex VI Chapter 4, COM (2021)562) have prompted the development and practical implementation of new decarbonization solutions. One of them, along with the use of renewable fuels, is the waste heat recovery of secondary heat sources from a ship’s main engine, whose energy potential reaches 45–55%. The organic Rankine cycle (ORC), which uses low-boiling organic working fluids, is considered one of the most promising and energy-efficient solutions for ship conditions. However, there remains uncertainty when choosing a rational cycle configuration, taking into account the energy consumption efficiency indicators of various low-temperature (cylinder cooling jacket and scavenging air cooling) and high-temperature (exhaust gas) secondary heat source combinations while the engine operates within the operational load range. It is also rational, especially at the initial stage, to evaluate possible constraints of ship technological systems for ORC implementation on the ship. The numerical investigation of these practical aspects of ORC applicability was conducted with widely used marine medium-speed diesel engines, such as the Wartsila 12V46F. Comprehensive waste heat recovery of all secondary heat sources in ORC provides a potential increase in the energy efficiency of the main engine by 13.5% to 21% in the engine load range of 100% to 25% of nominal power, while individual heat sources only achieve 3% to 8%. The average increase in energy efficiency over the operating cycle according to test cycles for the type approval engines ranges from 8% to 15% compared to 3% to 6.5%. From a practical implementation perspective, the most attractive potential for energy recovery is from the scavenging air cooling system, which, both separately (5% compared to 6.5% during the engine’s operating cycle) and in conjunction with other WHR sources, approaches the highest level of exhaust gas potential. The choice of a rational ORC structure for WHR composition allowed for achieving a waste heat recovery system energy efficiency coefficient of 15%. Based on the studied experimental and analytical relationships between the ORC (generated mechanical energy) energy performance (Pturb) and the technological constraints of shipboard systems (Gw), ranges for the use of secondary heat sources in diesel operational characteristic modes have been identified according to technological limits.

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“…They reported that the ORC system can reduce 678.1 tons/year of CO 2 in optimal operating conditions. Qu et al 12 experimentally analyzed a thermal system which consists of Rankine, ORC and power turbine WHR systems. According to the results, the pay-back period of the system is calculated as 5.2 years.…”

Section: Introductionmentioning

confidence: 99%

Thermo-economic optimization of an ORC system for a dual-fuel marine engine

Akman,

Ergin

2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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The Organic Rankine Cycle (ORC) is one of the most promising systems to recover the waste heat sourced from internal combustion engines. In this study, thermodynamic, economic and environmental analyses of the scavenge air cooling water-driven Waste Heat Recovery System (WHRS) based on the organic Rankine cycle are conducted for a dual-fuel marine engine integrated with exhaust gas recirculation (EGR) system. Zero ozone-depleting and low global warming potential working fluids; R245fa, R236ea from hydrofluorocarbons, R600a, R601a from hydrocarbons, R1234ze and R1234yf from hydrofluoroolefins are selected for the low-grade WHRS. In addition to the thermal analyses, the mass and volume of the system along with the safety factors of the working fluids are evaluated to judge the physical applicability of the system for ships. Thermo-economic performances of the fluids are analyzed, optimized and compared under various engine loads, Tier II and Tier III modes to reveal the effects of different engine operating conditions on the parameters. According to the results, scavenge air has a significant amount of waste heat at medium and heavy loads and switching the engine mode remarkably affects the performance of the WHRS. R601a shows the best thermo-economic performance, however, considering the applicability of the system R236ea is the most suitable working fluid for the ORC WHRS. The overall thermal efficiency of the power generation system can be increased by about 2.8%.

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Design and thermodynamic analysis of a combined system including steam Rankine cycle, organic Rankine cycle, and power turbine for marine low-speed diesel engine waste heat recovery

Cited by 33 publications

References 26 publications

A literature survey on exergy analyses of marine diesel engine and power systems

A literature survey on exergy analyses of marine diesel engine and power systems

Complex Use of the Main Marine Diesel Engine High- and Low-Temperature Waste Heat in the Organic Rankine Cycle

Thermo-economic optimization of an ORC system for a dual-fuel marine engine

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