Research on the performance and emission characteristics of the LNG-diesel marine engine

Li, Jiehui; Wu, Biao; Mao, Gongping

doi:10.1016/j.jngse.2015.09.036

Cited by 48 publications

(29 citation statements)

References 18 publications

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“…A recent study by Lehtoranta et al [13] showed that dual-fuel operation, with LNG as the main fuel, resulted in PM levels 72-75% lower than MDO. Li et al [14] reported similar results with a maximum drop percentage of 78% in dual fuel mode compared to pure diesel mode. Reduction of these local pollutants is particularly important for short sea vessels with regional operations near coasts and populated areas [15].…”

Section: Introductionmentioning

confidence: 64%

Environmental and Economic Evaluation of Fuel Choices for Short Sea Shipping

Spoof-Tuomi

Niemi

2020

Clean Technol.

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The shipping industry is looking for strategies to comply with increasingly stringent emission regulations. Fuel has a significant impact on emissions, so a switch to alternative fuels needs to be evaluated. This study investigated the emission performances of liquefied natural gas (LNG) and liquefied biogas (LBG) in shipping and compared them to conventional marine diesel oil (MDO) combined with selective catalytic reduction (SCR). For assessing the complete global warming potential of these fuels, the life-cycle approach was used. In addition, the study evaluated the local environmental impacts of combustion of these fuels, which is of particular importance for short sea shipping operations near coastal marine environment and residential areas. All three options examined are in compliance with the most stringent emission control area (ECA) regulations currently in force or entering into force from 2021. In terms of local environmental impacts, the two gaseous fuels had clear advantages over the MDO + SCR combination. However, the use of LNG as marine fuel achieved no significant CO2-equivalent reduction, thus making little progress towards the International Maritime Organization’s (IMO’s) visions of decarbonizing shipping. Major life cycle GHG emission benefits were identified by replacing fossil fuels with LBG. The most significant challenge facing LBG today is fuel availability in volumes needed for shipping. Without taxation or subsidies, LBG may also find it difficult to compete with the prices of fossil fuels.

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Section: Introductionmentioning

confidence: 64%

Environmental and Economic Evaluation of Fuel Choices for Short Sea Shipping

Spoof-Tuomi

Niemi

2020

Clean Technol.

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“…In [21], a marine DF engine was studied experimentally at steady state conditions complemented by a liquid fuel injection model to obtain a better understanding of the local combustion conditions. In Li et al [22], a small marine DF four-stroke engine was experimentally investigated for comparison with the engine performance/emissions characteristics in the diesel and the gas operating modes. Boeckhoff et al [23] presented the experimental investigation of a large marine DF four-stroke engine of the premixed combustion type at both steady state conditions (studying the effect of the engine and fuel parameters variations on the engine performance and emissions) and transient conditions (with fuel switching), reporting the engine operational experience.…”

Section: Introductionmentioning

confidence: 99%

Towards Marine Dual Fuel Engines Digital Twins—Integrated Modelling of Thermodynamic Processes and Control System Functions

Stoumpos

Theotokatos

Mavrelos

et al. 2020

JMSE

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This study aims at developing an integrated model that combines detailed engine thermodynamic modelling and the control system functional modelling paving the way towards the development of high-fidelity digital twins. To sufficiently represent the combustion process, a multi-Wiebe function approach was employed, whereas a database for storing the combustion model parameters was developed. The developed model was employed for the systematic investigation of a marine four-stroke dual fuel engine response during demanding transient operation with mode switching and load changes. The derived results were analysed to identify the critical engine components and their effect on the engine operational limitations. The results demonstrate that the developed model can sufficiently represent the engine and its subsystems/components behaviour and effectively capture the engine control system’s functionality. The appropriate turbocharger matching along with the sufficient design of the exhaust gas waste gate valve and fuel control systems are crucial for ensuring the smooth engine operation of dual fuel engines.

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“…However, when a fixed CCR NG gas component exists, there is a lack of data regarding the fuel mixture composition in wide and rational engine work mode ranges, as well as rational dual-fuel distribution in real-life operational range modes. Work that evaluates diesel reading changes under operational conditions has passive properties as a rule, without the realisation of experiments [4,26,35]. This is because of operational health and safety regulations for parameter changes, which limit fast-acting processes.…”

Section: Introductionmentioning

confidence: 99%

Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas

et al. 2019

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This paper presents a study on the energy efficiency and emissions of a converted high-revolution bore 79.5 mm/stroke 95 mm engine with a conventional fuel injection system for operation with dual fuel feed: diesel (D) and natural gas (NG). The part of NG energy increase in the dual fuel is related to a significant deterioration in energy efficiency (ηi), particularly when engine operation is in low load modes and was determined to be below 40% of maximum continuous rating. The effectiveness of the D injection timing optimisation was established in high engine load modes within the range of a co-combustion ratio of NG ≤ 0.4: with an increase in ηi, compared to D, the emissions of NOx+ HC decreased by 15% to 25%, while those of CO2 decreased by 8% to 16%; the six-fold CO emission increase, up to 6 g/kWh, was unregulated. By referencing the indicated process characteristics of the established NG phase elongation in the expansion stroke, the combustion time increase as well as the associated decrease in the cylinder excess air ratio (α) are possible reasons for the increase in the incomplete combustion product emission.

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Research on the performance and emission characteristics of the LNG-diesel marine engine

Cited by 48 publications

References 18 publications

Environmental and Economic Evaluation of Fuel Choices for Short Sea Shipping

Environmental and Economic Evaluation of Fuel Choices for Short Sea Shipping

Towards Marine Dual Fuel Engines Digital Twins—Integrated Modelling of Thermodynamic Processes and Control System Functions

Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas

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