Comparative life cycle cost analysis of low pressure fuel gas supply systems for LNG fueled ships

Wang, Cheng; Ju, Yonglin; Fu, Yunzhun

doi:10.1016/j.energy.2020.119541

Cited by 25 publications

(4 citation statements)

References 16 publications

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“…The economic evaluation in this study compares the two systems-re-liquefaction (Case 1) and the direct LP-SCR (Case 2)-based on life cycle cost (LCC) using Equation ( 6) [42]:…”

Section: Economic Evaluationmentioning

confidence: 99%

Techno-Economic Evaluation of Direct Low-Pressure Selective Catalytic Reduction for Boil-Off Gas Treatment Systems of NH3-Fueled Ships

Ji,

Jung,

Lee

2024

JMSE

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This study proposes a feasible solution for boil-off gas (BOG) treatment to facilitate NH3 fuel use by ocean-going ships, which is currently considered an alternative fuel for ships. Two systems were designed and analyzed for BOG in IMO Type-A NH3 fuel storage tanks for 14,000 TEU container ships. First, BOG lost inside the storage tank minimized economic losses through the onboard re-liquefaction system. The total energy consumed by the system to process NH3 gas generated in the fuel tank at 232.4 kg/h was 51.9 kW, and the specific energy consumption (SEC) was 0.223 kWh/kg. Second, NH3 was supplied to the direct Low-Pressure Selective Catalytic Reduction (LP-SCR) system to treat marine pollutants generated by combustion engines. The feasible design point was determined by calculating the NH3 feed flow rate using three methodologies. The energy consumed by the direct LP-SCR system was 3.89 and 2.39 kW, and the SEC was 0.0144 at 0.0167 kWh/kg at 100% and 25% load, respectively. The feasibility was indicated via economic analysis. Depending on the life cycle cost, the competitiveness of the re-liquefaction system depends on the price of NH3, where a higher price yields a more economical solution. In conclusion, the direct LP-SCR system has a low overall cost because of its low energy consumption when supplying NH3 and its reduced amount of core equipment.

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“…The economic evaluation in this study compares the two systems-re-liquefaction (Case 1) and the direct LP-SCR (Case 2)-based on life cycle cost (LCC) using Equation ( 6) [42]:…”

Section: Economic Evaluationmentioning

confidence: 99%

Techno-Economic Evaluation of Direct Low-Pressure Selective Catalytic Reduction for Boil-Off Gas Treatment Systems of NH3-Fueled Ships

Ji,

Jung,

Lee

2024

JMSE

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“… Tan et al (2020) proposed a mixed integer programming model to study the fuel use flexibility of LNG dual-fuel engine ships with limited LNG bunkering equipment. Wang et al (2020) performed a comparative analysis on the life cycle cost of the low-pressure gas supply system for a pure LNG-powered ship.…”

Section: Literature Reviewmentioning

confidence: 99%

Container fleet renewal considering multiple sulfur reduction technologies and uncertain markets amidst COVID-19

Zhao

Zhou

2021

Journal of Cleaner Production

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The onset of 2020 is marked by stricter restrictions on maritime sulfur emissions and the spread of Coronavirus Disease 2019 (COVID-19). In this background, liner companies now face the challenge to find suitable sulfur reduction technologies, make reasonable decisions on fleet renewal, and prepare stable operation plans under the highly uncertain shipping market. Considering three sulfur reduction technologies, namely, fuel-switching, scrubber, and liquefied natural gas (LNG) dual-fuel engine, this paper develops a robust optimization model based on two-stage stochastic linear programming (SLP) to formulate a decision plan for container fleet, which can deal with various uncertainties in future: freight demand, ship charter rate, fuel price, retrofit time and Sulfur Emission Control Area (SECA) ratio. The main decision contents include ship acquisition, ship retrofit, ship sale, ship charter, route assignment, and speed optimization. The effectiveness of our plan was verified through a case study on two liner routes from the Far East to Northwest America, operated by COSCO Shipping Lines. The results from SLP model show that large-capacity fuel-switching ships and their LNG dual-fuel engine retrofits should be included in the long-term investment and operation plan; slow-steaming is an important operational decision for ocean liner shipping; if the current SECA boundary is not further expanded or the sulfur emission restrictions not further tightened, the scrubber ship will have no advantage in investment cost and operation. However, considering the probabilities of more flexible scenarios, the results from the robust model suggest that it is beneficial to install scrubber on medium-capacity fuel-switching ships, and carry out more LNG dual-fuel engine retrofits for large-capacity fuel-switching ships. Compared with SLP, this robust strategy greatly reduces sulfur emissions while slightly pushing up carbon emissions.

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“…According to Ocean Forecast 2050, LNG will account for 40-80% of ship fuel by 2050 (DNV, 2019). Since 2000, the number of LNG-powered vessels operating or being built around the world has gradually increased (Baalisampang et al, 2018;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics simulation of cryogenic safety analysis in an liquefied natural gas powered ship during liquefied natural gas leakage

et al. 2023

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LNG is considered a promising alternative fuel for the marine industry with the increasingly strict environmental requirements while the safety problems caused by LNG leakage accidents need to be concerned and analyzed. In this article, the cryogenic safety analysis of the fuel gas preparation room in an LNG-powered ship during LNG leakage accidents was performed by CFD simulations. The simulation results showed as follows: the range of cryogenic region in the fuel gas preparation room was related to flow field direction during LNG leakage; The surface temperature of equipment dropped to some extent during LNG leakage accidents. The temperature drop was less than 15°C, which was confirmed to be a safe temperature range in engineering; In addition, for safety operation analysis, the NG distribution situation of dangerous regions with explosive limit was also obtained.

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Comparative life cycle cost analysis of low pressure fuel gas supply systems for LNG fueled ships

Cited by 25 publications

References 16 publications

Techno-Economic Evaluation of Direct Low-Pressure Selective Catalytic Reduction for Boil-Off Gas Treatment Systems of NH3-Fueled Ships

Techno-Economic Evaluation of Direct Low-Pressure Selective Catalytic Reduction for Boil-Off Gas Treatment Systems of NH3-Fueled Ships

Container fleet renewal considering multiple sulfur reduction technologies and uncertain markets amidst COVID-19

Computational fluid dynamics simulation of cryogenic safety analysis in an liquefied natural gas powered ship during liquefied natural gas leakage

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