The Design and Operational Characteristics of a Combined Cycle Marine Powerplant

Merz, C. A.; Pakula, T J

doi:10.1115/72-gt-90

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…In its current development, there are various combined marine propulsion systems, including a combination of one or more diesel engines, gas engines, gas turbines, steam turbines, and electric propulsion [4].One of the most promising combined marine propulsion systems is a combined gas turbine and steam turbine integrated electric drive system (COGES) [5]. Initially, the COGES concept was introduced Energies 2024, 17, 1415 2 of 17 as an effort to increase power plant efficiency by integrating the gas cycle and steam cycle in one system [6]. Early in its development, COGES was faced with several technical and economic challenges, but over time, innovation and technological improvements have improved its performance and capabilities [7].…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of Combined Gas and Steam Propulsion System of Liquefied Natural Gas Carrier

Budiyanto,

Putra,

Riadi

et al. 2024

Energies

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Various combinations of ship propulsion systems have been developed with low-carbon-emission technologies to meet regulations and policies related to climate change, one of which is the combined gas turbine and steam turbine integrated electric drive system (COGES), which is claimed to be a promising ship propulsion system for the future. The objective of this paper is to perform a techno-economic and environmental assessment of the COGES propulsion system applied to liquefied natural gas (LNG) carriers. A propulsion system design for a 7500 m3 LNG carrier was evaluated through the thermodynamics approach of the energy system. Subsequently, carbon emissions and environmental impact analyses were carried out through a life cycle assessment based on the power and fuel input of the system. Afterwards, a techno-economic analysis was carried out by considering the use of boil-off gas for fuel and additional income from carbon emission incentives. The proposed propulsion system design produces 1832 kilowatts of power for a service speed of 12 knots with the total efficiency of the system in the range of 30.1%. The results of the environmental evaluation resulted an overall environmental impact of 10.01 mPts/s. The results of the economic evaluation resulted in a positive net present value and a logical payback period for investment within 8 years of operation. The impact of this result shows that the COGES has a promising technological commercial application as an environmentally friendly propulsion system. Last, for the economy of the propulsion system, the COGES design has a positive net present value, an internal rate return in the range of 12–18%, and a payback period between 6 and 8 years, depending on the charter rate of the LNG carrier.

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Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of Combined Gas and Steam Propulsion System of Liquefied Natural Gas Carrier

Budiyanto,

Putra,

Riadi

et al. 2024

Energies

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“…Regarding the GTs, their use in the merchant and passenger navy is practically nil. In the marine propulsion field, to remedy the GTs lower efficiency, compared to diesel engines one, plant solutions called COmbined Gas And Steam (COGAS) have been proposed in literature [1][2][3][4], which combine a GT with a bottoming steam plant, whose thermodynamic cycle is powered (thermally) by the GT Brayton cycle waste heat. In [5,6] this solution is proposed for container ship propulsion, while for passenger cruise ships and fast ferry this solution is examined in [7,8].…”

Section: Introductionmentioning

confidence: 99%

WR21 marine gas turbine thermodynamic simulator for ship propulsion studies

Ugo Campora

2024

Int. J. Front. Eng. Technol. Res.

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An original modular mathematical model, based on physical laws, for steady state and dynamics performance simulation of the WR21 gas turbine is presented in the paper. The model, developed in Matlab-Simulink language, is organized in modular form. Each gas turbine component (i.e. compressor, turbine, combustor, heat exchanger) is modelled in a specific simulator block, that simulates the performance of its pertinent component by means of steady state performance maps and/or correlations, time dependent momentum, energy and mass equations, nonlinear algebraic equations. The great application flexibility of the component simulator modules, allows to modelling any gas turbine layout (i.e. axial or radial flow compressor and turbine, rotating shafts number, heat exchangers). The WR21gas turbine, developed mainly for marine propulsion application, is a three shafts gas turbine with thermal regeneration. It is characterized by a high thermodynamic efficiency, which remains high up to 30% of the design power. The WR21 simulator results are validated by comparison with manufacturer or literature data. The WR21 gas turbine main performances are compared to those of the LM 2500 gas turbine, obtained by a previously author paper. The LM 2500 is the gas turbine currently most used in naval propulsion plants. In the article, a comparison between the steady state working data of the two gas turbines is reported in tabular and graphical form and commented.

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“…COGES plants are based on terrestrial power plant know-how developed approximately one century ago, hence they are a well-known and mature technology entered the marine sector in '70 when some aeroderivative GTs were introduced in marine propulsion market. Merz and Pakula [16] were among the first ones to study COGES plants applied to marine propulsion sector underlying their low environmental impact and fuel consumption rate as well as its operational flexibility. Haglind [17] proposed container ships, tankers and bulk carriers as possible application of COGES propulsion plants, while Benvenuto et al [18,19] focused their attention on large container ships.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of an integrated COGES-DF engine power plant in LNG propulsion for a cruise-ferry

Dotto

Campora

Satta

2021

Energy Conversion and Management

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The Design and Operational Characteristics of a Combined Cycle Marine Powerplant

Cited by 11 publications

References 2 publications

Techno-Economic Analysis of Combined Gas and Steam Propulsion System of Liquefied Natural Gas Carrier

Techno-Economic Analysis of Combined Gas and Steam Propulsion System of Liquefied Natural Gas Carrier

WR21 marine gas turbine thermodynamic simulator for ship propulsion studies

Feasibility study of an integrated COGES-DF engine power plant in LNG propulsion for a cruise-ferry

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