Computational investigation of a large containership propulsion engine operation at slow steaming conditions

Guan, Cong; Theotokatos, Gerasimos; Zhou, Peilin; Chen, Hui

doi:10.1016/j.apenergy.2014.05.063

Cited by 70 publications

(71 citation statements)

References 26 publications

(41 reference statements)

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“…Figure 6 shows AFR actual and stoichiometric air consumption change with main engine loads. Actual (total) AFR was very close to the results presented in the work of Guan et al [29] for the main engine load from 50 to 100% SMCR. In this work, a new term was defined, the air consumption ratio/factor.…”

Section: Resultssupporting

confidence: 74%

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An Investigation of the Composition of the Flow in and out of a Two-Stroke Diesel Engine and Air Consumption Ratio

2017

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Abstract:The aim of this research was to investigate the mass, substance and energy flow through two-stroke low speed Diesel engines. For this reason, a zero-dimensional model of the combustion in the engine was developed with a calculated amount and composition of exhaust gases. Due to the large amount of oxygen in the exhaust gases, a ratio of real air consumption and stoichiometric amount of air required for combustion of injected fuel was set. The calculated ratio showed that the engine consumed four times more air than needed for combustion in AFR stoich . In this work, this was called the Air Consumption Factor or Ratio, and has not previously been mentioned in scientific literature. The air consumption ratio is defined as a factor of dry or humid air. To be more comprehensive, a modified diagram of the composition of the flow in and out of a two-stroke fuel injection engine and the cylinder was made.

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Section: Resultssupporting

confidence: 74%

“…η rt = mass of delivered air retained mass of delivered air / cycle = m ar m sc (29) This shows how much air comes directly to the exhaust.…”

Section: (D) Retaining Efficiency η Rtmentioning

confidence: 99%

An Investigation of the Composition of the Flow in and out of a Two-Stroke Diesel Engine and Air Consumption Ratio

2017

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“…The former are fast running and need less input, but they require an elaborate setting up phase in order to predict the engine behaviour with sufficient accuracy. Furthermore, the in-cycle variation (per degree crank angle) cannot be represented [38,39] and therefore the modelling of engines with varying settings poses difficulties since parametric response surfaces are needed [40,41]. The latter are more complex and require a greater amount of input data and execution time, but they can represent the engine working processes more accurately and predict the in-cylinder parameters variation.…”

Section: Introductionmentioning

confidence: 99%

“…Although slow steaming is commonly used in the last years, only limited published works have investigated this specific engine operating phases [41][42][43]. Kyrtatos et al [43] proposed a novel way of evaluating engine performance by comparing service monitored data and thermodynamic model predictions, and they carried out a study for predicting a VLCC main engine performance at slow steaming conditions concluding that a sufficient extrapolation of the compressor map is required in order to avoid errors in simulation results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Two Stroke Marine Diesel Engine Operation Including Turbocharger Cut-Out by Using a Zero-Dimensional Model

2015

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Abstract:In this article, the operation of a large two-stroke marine diesel engine including various cases with turbocharger cut-out was thoroughly investigated by using a modular zero-dimensional engine model built in MATLAB/Simulink environment. The model was developed by using as a basis an in-house modular mean value engine model, in which the existing cylinder block was replaced by a more detailed one that is capable of representing the scavenging ports-cylinder-exhaust valve processes. Simulation of the engine operation at steady state conditions was performed and the derived engine performance parameters were compared with the respective values obtained by the engine shop trials. The investigation of engine operation under turbocharger cut-out conditions in the region from 10% to 50% load was carried out and the influence of turbocharger cut-out on engine performance including the in-cylinder parameters was comprehensively studied. The recommended schedule for the combination of the turbocharger cut-out and blower activation was discussed for the engine operation under part load conditions. Finally, the influence of engine operating strategies on the annual fuel savings, CO2 emissions reduction and blower operating hours for a Panamax container ship operating at slow steaming conditions is presented and discussed. OPEN ACCESSEnergies 2015, 8 5739

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“…Recently, Guan et al [10] presented an analytical study of the part-load performance of different main engine and turbocharger (T/C) configurations useful for low-load operation. A novel methodology for the modelling of the compressor low-speed region was also proposed in this work.…”

Section: Introductionmentioning

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 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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Computational investigation of a large containership propulsion engine operation at slow steaming conditions

Cited by 70 publications

References 26 publications

An Investigation of the Composition of the Flow in and out of a Two-Stroke Diesel Engine and Air Consumption Ratio

An Investigation of the Composition of the Flow in and out of a Two-Stroke Diesel Engine and Air Consumption Ratio

Analysis of Two Stroke Marine Diesel Engine Operation Including Turbocharger Cut-Out by Using a Zero-Dimensional Model

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

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