Review article
https://doi.org/10.21278/brod70304
ENVIRONMENTAL AND COST-EFFECTIVENESS COMPARISON OF DUAL FUEL PROPULSION OPTIONS FOR EMISSIONS REDUCTION ONBOARD LNG CARRIERS
Nader R. Ammar
; 1 Department of Marine Engineering, Faculty of Maritime Studies, King Abdulaziz University, 21589 Jeddah, Saudi Arabia. 2 Department of Naval Architecture and Marine Engineering, Faculty of Engineering, Alexandria University 21544 Alexandria, Egypt
Abstract
The selection of the suitable propulsion system for LNG carrier highly affects the ship capital and life cycle costs. The current paper compares between the available propulsion systems for LNG carriers from environmental and economic points of view operated with heavy fuel oil (HFO) and marine gas oil (MGO). In addition, the cost-effectiveness for emission reduction due to using dual fuel propulsion options using natural gas fuel (NG) is calculated. As a case study, large conventional LNG carrier class has been investigated. The results show that steam turbine (ST), Ultra-ST, dual fuel diesel engine (DFDE), and combined gas and steam (COGAS) propulsion options can comply with NOx and SOx emissions regulations set by IMO using dual fuel mode with NG percentages of 87.5%, 82%, 98.5% and 94%, respectively. DFDE operated with pilot HFO and NG is the most economic propulsion option. It reduces the dual fuel costs by 1.37 MUS$/trip compared with HFO cost. The annual cost-effectiveness for the most economic and emission compliance propulsion option is 6.07 $/kg, 6.39 $/kg, and 0.55 $/kg for reducing NOx, SOx, and CO2 emissions, respectively.
Keywords
LNG carriers; Propulsion options; Boil-off gas; Environmental and economic analysis; EEDI; Fuel saving cost-effectiveness
Hrčak ID:
221116
URI
Publication date:
30.9.2019.
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