Clean Air Gas Engine (CAGE): reducing emissions by replacing diesel power in construction

Davidson, Andrea; Wait, Neil; Desouza, Carl; Marsh, Daniel; Andrews, Paul; Chapman, Stan

doi:10.1680/hs2.66915.229

Cited by 1 publication

(1 citation statement)

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“…Higher efficiency and cleaner fuel can reduce carbon dioxide (CO 2 ) and nitrogen oxide (NO x ) emissions [58]. The COGES system does not rely on combustion like diesel and DFDE systems, which can lead to lower methane emissions, a potent greenhouse gas [59]. This is in line with other research; from direct measurements on LNG carrier ships, it was found that CO 2 emissions from using gas fuel were lower compared to conventional diesel engines [60].…”

Section: Analysis Of the Environmental Impact Of The Systemsupporting

confidence: 65%

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: Analysis Of the Environmental Impact Of The Systemsupporting

confidence: 65%