Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Ammar, Nader R.

doi:10.21278/brod70304

Cited by 32 publications

(24 citation statements)

References 49 publications

(78 reference statements)

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“…In continuous steps, the International Maritime Organization (IMO) seeks to reduce the adverse effect of ship emissions by issuing the relative regulations within Annex VI of Marine Pollution Convention 78 (Ammar 2018 , 2019a ; Ammar and Seddiek 2017 ; Halff et al 2018 ; IMO 2018 , 2019 ). In addition to the international legislations, IMO pursues to urge those interested in the shipping industry to reach zero emissions ship either through the use of alternative fuels or a clean source of energy onboard ships (Ammar 2019b ; Joung et al 2020 ; Scott et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Seddiek

Ammar

2021

Environ Sci Pollut Res

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Shipping faces challenges of reducing the dependence on fossil fuels to align with the international regulations of ship emissions reduction. The maritime industry is in urgent need of searching about alternative energy sources for ships. This paper highlights the applicability of harnessing wind power for ships. Flettner rotors as a clean propulsion technology for commercial ships are introduced. As a case study, one of the bulk carrier ships operating between Damietta port in Egypt and Dunkirk port in France has been investigated. The results showed the high influence of the interaction between ship course and wind speed and direction on the net output power of Flettner rotors. The average net output power for each rotor will be 384 kW/h. Economically, the results reveal that the use of Flettner rotors will contribute to considerable savings, up to 22.28% of the annual ship’s fuel consumption. The pay-back period of the proposed concept will be 6 years with a considerable value of levelized cost of energy. Environmentally, NO x and CO 2 emissions will be reduced by 270.4 and 9272 ton/year with cost-effectiveness of $1912 and $55.8/ton, respectively, at annual interest rate of 10%.

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Section: Introductionmentioning

confidence: 99%

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Seddiek

Ammar

2021

Environ Sci Pollut Res

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“…As for example, steam propulsion systems are still dominantly represented in the propulsion of LNG (Liquefied Natural Gas) carriers due to the specificity of its operations and transported cargo [8,9]. However, internal combustion dual-fuel en-gines each day takes stronger and stronger impact also in LNG carriers propulsion systems, therefore it can be expected that in the near future it will overcome traditional steam propulsion [10,11].…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

et al. 2020

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This paper presents an exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system. Based on the operating parameters obtained in system exploitation, it is performed analysis of each system component individually, as well as analysis of the whole observed system. While observing all heat exchangers it is found that combustion gases-CO2 heat exchangers have the lowest exergy destructions and the highest exergy efficiencies (higher than 92%). The lowest exergy efficiency of all heat exchangers is detected in Cooler (51.84%). Observed system is composed of two gas turbines and two compressors. The analysis allows detection of dominant mechanical power producer and the dominant mechanical power consumer. It is also found that the turbines from the observed system have much higher exergy efficiencies in comparison to compressors (exergy efficiency of both turbines is higher than 94%, while exergy efficiency of both compressors did not exceed 87%). The whole observed waste heat recovery system has exergy destruction equal to 6270.73 kW, while the exergy efficiency of the whole system is equal to 64.12% at the selected ambient state. Useful mechanical power produced by the whole system and used for electrical generator drive equals 11204.80 kW. The obtained high exergy efficiency of the whole observed system proves its application on-board ships.

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“…Along with mentioned ones, it should be noted that new marine propulsion systems which are based on various combinations of gas turbine, steam turbine and diesel engine (or more of them) are currently under the development [21,22]. Such complex systems integrate in one engine room several benefits of each propulsion element in a current combination.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Perceptron approach to Condition-Based Maintenance of Marine CODLAG Propulsion System Components

et al. 2019

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In this paper multilayer perceptron (MLP) approach to condition-based maintenance of combined diesel-electric and gas (CODLAG) marine propulsion system is presented. By using data available in UCI, online machine learning repository, MLPs for prediction of gas turbine (GT) and GT compressor decay state coefficients are designed. Aforementioned MLPs are trained and tested by using 11 934 samples, of which 9 548 samples are used for training and 2 386 samples are used testing. In the case of GT decay state coefficient prediction, the lowest mean relative error of 0.622 % is achieved if MLP with one hidden layer of 50 artificial neurons (AN) designed with Tanh activation function is utilized. This configuration achieves the best results if it is trained by using L-BFGS solver. In the case of GT compressor decay state coefficient, the best results are achieved if MLP is designed with four hidden layers of 100, 50, 50 and 20 ANs, respectively. This configuration is designed by using Logistic sigmoid activation function. The lowest mean relative error of 1.094 % is achieved if MLP is trained by using L-BFGS solver.

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Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Cited by 32 publications

References 49 publications

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

Multilayer Perceptron approach to Condition-Based Maintenance of Marine CODLAG Propulsion System Components

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