Gas Turbines for Marine Applications

Sayma, A. I.

doi:10.1002/9781118476406.emoe227

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…It was assumed that the CCGT burns LNG and MDO, and the two-stroke diesel engine burns MDO. It was also assumed that NO x and CO 2 were used for CCGT and two-stroke diesel engine emission factors in g/kWh regarding the engine or fuel type found in [28][29][30][31][32][33][34], as shown in Table 5. Figure 12 shows the effect of TET with NOx emission on all CCGT cycles; increasing the TET increases the NOX emission.…”

Section: Environmental Resultsmentioning

confidence: 99%

Techno-Environmental Evaluation of a Liquefied Natural Gas-Fuelled Combined Gas Turbine with Steam Cycles for Large Container Ship Propulsion Systems

2022

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Restrictions on emissions are being imposed by regional and international shipping organisations, which raise the question of which marine fuel and technology can most effectively replace heavy fuel oil and diesel engines. The aim of this study is to find appropriate advanced combined gas and steam turbine cycles for marine propulsion systems in a large container ship with respect to the evolving maritime environmental regulations. The selection criteria are the thermodynamic performance, emissions, size, and weight of advanced combined gas and steam turbine cycles in a large container ship. Two baselines are used: a diesel engine using marine diesel oil and a combined gas and steam turbine system using liquefied natural gas and marine diesel oil. Then, liquefied natural gas cycles are examined based on fuel replacement and enhanced to assess the benefits of liquefied natural gas over marine diesel oil. The results show that the enhanced liquefied natural gas combined gas and steam turbine cycles are the most efficient, at up to 1.6% higher than the other cycles. Regarding the size and weight, the combined gas and steam turbine propulsion system is approximately 24.7% lighter than the original diesel engine propulsion system.

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Section: Environmental Resultsmentioning

confidence: 99%

Techno-Environmental Evaluation of a Liquefied Natural Gas-Fuelled Combined Gas Turbine with Steam Cycles for Large Container Ship Propulsion Systems

2022

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“…Gas turbine engines are used on large sea vessels (tankers, cargo and military ships, passenger liners, etc.) [6,7]. The gas turbine drive is also used for modern tanks.…”

Section: Introductionmentioning

confidence: 99%

Tribology Characteristics of Heatproof Alloys at a Dynamic Pin Ladening in the Variable Temperature Field

Bembenek,

Tsyganov,

Sakhniuk

et al. 2023

Adv. Sci. Technol. Res. J.

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An analysis of the operating conditions of gas turbine engines, their components, and the destruction causes was carried out. The designer problems of tribo-joints operating under difficult conditions of force and temperature loads are singled out. The study aimed at obtaining the comparable quantitative dependences of blade material wear, taking into account the role of both cyclical changes in the temperature of the gas flow under the conditions close to real ones, and their frictional characteristics. Deformable heat-resistant nickel alloys and foundry heatresistant nickel alloys from which T-shaped samples were made, were chosen for the research. The tests were carried out on the developed gas dynamic stand, which simulates the working conditions of the bandage joints of the bladed turbomachines of gas turbine installations. The intensity of wear was determined as the ratio of the worn material volume to the number of load cycles under different temperature conditions. The wear resistance of three-way connections operating under the conditions of non-stationary thermal loads and fluctuations in the contact was considered. It was shown that thermal cycling leads to a decrease in the wear resistance of heat-resistant nickel alloys by 2-3 times and depends on the average temperature of the cycle. It wasfound that resistance to the wear, and also the character of change of coefficient of friction is mainly determined by the terms of education and destruction of the protective superficial layer. Basic factors managing tribology processes in the zone of contact were determined.

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“…Aero-derivative engines [7][8][9] have always been a good choice for marine applications and have been preferred in military ships since 1947 [10]. Along with the robust safety and rigorous maintenance systems associated with engines derived from the aviation industry [11], there is also the problem of the high initial cost, the requirement of more processed fuel, and the installation sensitivity when compared against the diesel counterpart. In terms of nitrogen oxides (NOx) [12] and carbon dioxide emissions [13], gas turbine engines are among the least polluting because of their finely tuned burning chambers and their continuous operating cycle, which maintains the temperature at a very constant level, under the threshold of NOx formation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

Dumitrescu

Drãgan

Gherman

et al. 2023

JMSE

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This paper describes the effort of designing an unconventional exhaust manifold for a marine gas turbine engine, with an integrated passive ventilation port for cooling the engine housing. The study is part of a larger program to substitute the propulsion gas turbines for the T22R defense frigate and make the proper aerodynamic adaptations. The system in question is unique, in the sense that it uses the exhaust gas momentum to entrain outside air and ventilate the engine enclosure. In achieving this, RANS computation was used to test various concepts and dimensions for the ventilation system. Based on these analyses, the design that provided adequate air circulation with minimum pressure losses was chosen and the parts were integrated in the overall assembly. The experimental campaign performed on the entire aero-package showed good synergies of the ventilation system with the other adaptations and the engine itself. Performance was evaluated with pressure and temperature probes distributed around the aero-package and were found to be within 3.5% of the data predicted by CFD. This brings further studies closer to a technology readiness level vital for insitu testing on board the ship itself.

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Gas Turbines for Marine Applications

Cited by 4 publications

References 9 publications

Techno-Environmental Evaluation of a Liquefied Natural Gas-Fuelled Combined Gas Turbine with Steam Cycles for Large Container Ship Propulsion Systems

Techno-Environmental Evaluation of a Liquefied Natural Gas-Fuelled Combined Gas Turbine with Steam Cycles for Large Container Ship Propulsion Systems

Tribology Characteristics of Heatproof Alloys at a Dynamic Pin Ladening in the Variable Temperature Field

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

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