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

Dotto, A.; Campora, Ugo; Satta, Francesca

doi:10.1016/j.enconman.2021.114602

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…Then, to find out the Q in value, which is the product of the gas fuel mass flow rate and the lower heating value (LHV) of the fuel, the Q in calculation uses Equation (4). Thus, the value of the system's overall efficiency is designed using Equation (5).…”

Section: Cyclementioning

confidence: 99%

“…Meanwhile, if the ship is going to move at its maximum design speed of 14 knots, the required power is 3377 kW using a COGES combination design system at 44% loading conditions. Based on thermodynamic simulation data, the overall efficiency of the COGES system was calculated using Equation (5), resulting in a maximum efficiency of the system is 30.1%. This aligns with the practical operation of low-power-range power plants, where efficiencies typically range from 25% to 35% [54,55].…”

Section: Performance Of Coges Systemmentioning

confidence: 99%

“…Several technologies continue to be developed to increase decarbonization on ships, including combined marine propulsion [3]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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: Cyclementioning

confidence: 99%

Section: Performance Of Coges Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Combined gas turbine electricity and steam (COGES) is a propulsion system that uses a gas turbine to generate electric power, which is then utilized to drive an electric motor that is connected to a shaft propeller (Dotto, Campora, and Satta, 2021). To increase the performance of the gas turbine, several LNG vessels with COGES systems utilize exhaust gas to reheat the steam and used it as a heat recovery steam generator (Ziółkowski et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Combined Gas-Electric Steam Turbine System as Main Propulsion for Small-scale LNG Carrier Ships

Budiyanto,

Zidane,

Putra

et al. 2023

IJTech

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The development of liquefied natural gas (LNG) carrier ships is increasing rapidly along with the demand for alternative energy sources. This study aims to analyze the performance of an LNG-fueled propulsion system for a small-scale LNG carrier ship with a combination gas-electric steam turbine system (COGES). The performance of the propulsion system is analyzed based on the power output generation and the environmental effect of the system. The total power output was evaluated using thermodynamic analysis and the environmental impact was measured by carbon emissions using the life-cycle assessment approach. The analysis results show the COGES propulsion system potentially generates total power of 7600 kW at peak load. The desired ship operational speed of 12 knots can be achieved at 24% load of the total power output. The COGES propulsion system also indicates a low emission than other systems with a carbon emission is 0.149 kgCO2/kWh.

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“…DFDE -dual fuel diesel electric SSD -slow-speed diesel engine S. Reheat -steam thermal reheat STaGE -hybrid propulsion system consists of steam turbine and electric motor Despite much research in this area[7,13,16,17,28,29], a simple quantification of the benefits of introducing newer technologies on LNG carriers has never been clearly formulated. Many studies and research in this area emphasize the environmental impact of newer technologies[6,7,14,16,17,20,26,30] without quantifying the overall impact of these changes on the environment.…”

mentioning

confidence: 99%

Analysis of LNG carrier propulsion developments

et al. 2022

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The LNG market has undergone major changes and significant development in recent years. With the increase in the number of ships and the increase in the amount of gas transported, the propulsion machinery of LNG ships has also changed. For many years, the steam turbine was the only propulsion engine on this type of cargo ship. A negligible number of vessels powered by a traditional, low-speed, heavy-duty diesel engines are increasingly being replaced by new technologies. Versions of dual-fuel internal combustion engines that burn evaporated natural gas are increasingly replacing steam turbine propulsion systems. This phenomenon has been particularly pronounced in the last few years, when orders for steam turbine-powered LNG vessels have ceased. This article examines and presents the main reasons for these changes, which fall into two categories. The first is financial, as the use of new technologies can lead to significant financial savings in fuel consumption. Fuel costs can be reduced by more than 35% in some cases. The reduction in fuel consumption leads to a significant reduction in overall exhaust emissions and thus a reduction in air pollution and CO2 signature.

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

Cited by 12 publications

References 22 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

Performance Analysis of Combined Gas-Electric Steam Turbine System as Main Propulsion for Small-scale LNG Carrier Ships

Analysis of LNG carrier propulsion developments

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