A comparison of advanced heat recovery power cycles in a combined cycle for large ships

Larsen, Ulrik; Sigthorsson, Oskar; Haglind, Fredrik

doi:10.1016/j.energy.2014.06.096

Cited by 89 publications

(48 citation statements)

References 27 publications

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“…The 12K98ME engine was used for optimisation in the present study, while the 7L70MC engine was used in a previous study [25].…”

Section: Calibrationmentioning

confidence: 99%

“…Table 3 presents the optimisation parameters and their boundaries, which were chosen wide enough to ensure that the optima would not be limited by the parameter variation limits. The start of injection time (SOI), end of injection time, exhaust valve closing time (EVC), scavenge pressure (P sc ) and fuel mass flow rates (ṁ f ) were optimised independently for each load (25,50,75 and 100%). The air mass flow rates (ṁ a ) were optimised only at design point, i.e., 100% load and at 25% in cases with an auxiliary blower.…”

Section: Optimisationmentioning

confidence: 99%

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Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

Larsen

Pierobon

Baldi

et al. 2015

Energy

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a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships. Energy, 80, 545-555. DOI: 10.1016/j.energy.2014 Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships AbstractThe international regulations on fuel efficiency and NOx emissions of commercial ships motivate the investigation of new system layouts, which can comply with the regulations. In combustion engines, measures to reduce the fuel consumption often lead to increased NOx emissions and careful consideration of this trade-off mechanism is required in the design of marine propulsion systems.This study investigates five different configurations of two-stroke diesel-based machinery systems for large ships and their influence on the mentioned trade-off. Numerical models of a low-speed two-stroke diesel engine, turbochargers and an organic Rankine cycle, are used for the optimisation of the NOx and fuel consumption at design and part-load conditions, using a multi-objective genetic algorithm. Moreover, the effects of engine tuning and exhaust gas recirculation are investigated.The results suggest that increased system complexity can lead to lower fuel consumption and NOx.Fuel consumption reductions of up to 9% with a 6.5% NOx reduction were achieved using a hybrid turbocharger and organic Rankine cycle waste heat recovery system.

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“…The 12K98ME engine was used for optimisation in the present study, while the 7L70MC engine was used in a previous study [25].…”

Section: Calibrationmentioning

confidence: 99%

Section: Optimisationmentioning

confidence: 99%

Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

Larsen

Pierobon

Baldi

et al. 2015

Energy

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“…A review of waste heat recovery systems on two-stroke internal combustion engines aboard ships is given by Shu et al [105] and a study by Larsen et al compares the steam cycle, Kalina cycle and organic Rankine cycle for marine application [124]. The most conventional waste heat recovery system (WHRS) employed today consists of a power turbine expanding part of the exhaust gas to ambient pressure and a steam boiler, which is used in a Rankine cycle for electricity production.…”

Section: Global Ecamentioning

confidence: 99%

“…This is a methodology not found in the present literature. To further increase the energy efficiency of the propulsion system, the heat from the WSA process will be utilized in an organic Rankine cycle, where the extensive work found in literature [125,126,124,107,127,128] can be drawn upon. The proposed system will enable ship owners and operators to continue to use the cheaper HFO, while still complying with future legislations on SO x .…”

Section: Global Ecamentioning

confidence: 99%

Design and modeling of an advanced marine machinery system including waste heat recovery and removal of sulphur oxides

Nielsen

Haglind

Larsen

2014

Energy Conversion and Management

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Abstract:In order to reduce the formation of acid rain and its harmful effects, stricter legislations on emissions of sulphur oxides from ships applies as of 2015 in emission control areas and globally in 2020 by the international maritime organization (IMO). Consequently, prices on low sulphur fuels are expected to increase drastically compared to those of heavy fuel oil, giving ship owners a strong incentive to find alternative ways of complying with the legislations. In addition, IMO regulations on carbon dioxide emissions and high fuel prices provide incentives for improving the efficiency of the machinery system. The wet sulphuric acid process has shown to be an effective way of removing sulphur oxides from flue gas of landbased coal fired power plants. Moreover, organic Rankine cycles are suitable for heat to power conversion for low temperature heat sources. This paper is aimed at designing and modelling a highly efficient machinery system which includes the removal of exhaust gas sulphur oxides. Numerical simulations are carried out using an open source software developed at Technical University of Denmark called Dynamic Network Analysis (DNA). The machinery system suggested in this paper consists of a two-stroke diesel engine, the wet sulphuric process for sulphur removal and an advanced waste heat recovery system including a conventional steam Rankine cycle and an organic Rankine cycle. The results are compared with those of a state-of-the-art machinery system featuring a two-stroke diesel engine and a conventional waste heat recovery system. The results suggest that an organic Rankine cycle placed after the conventional waste heat recovery system is able to extract the sulphuric acid from the exhaust gas, while at the same time increase power generation from waste heat by 32.9% and the combined cycle thermal efficiency by 2.6%. The findings indicates that the technology has an energetic and environmental potential in marine applications, while still further research and development need to be done before it can be put into operation on ships.

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“…Larsen et al [20] compared the design point performance of a dual pressure SRC system, an ORC unit and a Kalina cycle power plant. The analysis included performance estimations and qualitative assessments of the three competing WHR technologies.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Organic and Steam Rankine Cycle Power Systems for Waste Heat Recovery on Large Ships

2017

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This paper presents a comparison of the conventional dual pressure steam Rankine cycle process and the organic Rankine cycle process for marine engine waste heat recovery. The comparison was based on a container vessel, and results are presented for a high-sulfur (3 wt %) and low-sulfur (0.5 wt %) fuel case. The processes were compared based on their off-design performance for diesel engine loads in the range between 25% and 100%. The fluids considered in the organic Rankine cycle process were MM(hexamethyldisiloxane), toluene, n-pentane, i-pentane and c-pentane. The results of the comparison indicate that the net power output of the steam Rankine cycle process is higher at high engine loads, while the performance of the organic Rankine cycle units is higher at lower loads. Preliminary turbine design considerations suggest that higher turbine efficiencies can be obtained for the ORC unit turbines compared to the steam turbines. When the efficiency of the c-pentane turbine was allowed to be 10% points larger than the steam turbine efficiency, the organic Rankine cycle unit reaches higher net power outputs than the steam Rankine cycle unit at all engine loads for the low-sulfur fuel case. The net power production from the waste heat recovery units is generally higher for the low-sulfur fuel case. The steam Rankine cycle unit produces 18% more power at design compared to the high-sulfur fuel case, while the organic Rankine cycle unit using MM produces 33% more power.

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A comparison of advanced heat recovery power cycles in a combined cycle for large ships

Cited by 89 publications

References 27 publications

Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

Design and modeling of an advanced marine machinery system including waste heat recovery and removal of sulphur oxides

A Comparison of Organic and Steam Rankine Cycle Power Systems for Waste Heat Recovery on Large Ships

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