Development of the New Energy Saving Device for the Reduction of Fuel of 176k Bulk Carrier

Song, Hyun-Jin; Kim, Moon-Chan; Lee, Won Joon; Lee, Kyoung-Wan; Kim, Jihee

doi:10.3744/snak.2015.52.6.419

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…The same design concept of PSD was applied to the target ship 158K crude oil tanker; however, a sufficiently satisfactory improvement in propulsion efficiency was not obtained. An improvement of only 1.6% gain in terms of delivered horsepower on the model scale was obtained, as shown in Table 4, which is quite different from previous results [26].…”

Section: Investigation Of Wake and Validationcontrasting

confidence: 90%

“…The developed pre-swirl duct was successfully applied to 176K bulk carriers [26]. An efficiency gain of approximately 8% was obtained using the developed PSD.…”

Section: Investigation Of Wake and Validationmentioning

confidence: 99%

“…Regarding stator design, the pitch angle is the most important factor. In a previous The developed pre-swirl duct was successfully applied to 176K bulk carriers [26]. An efficiency gain of approximately 8% was obtained using the developed PSD.…”

Section: Design Of Ring Statormentioning

confidence: 99%

“…In a previous study [24], the potential-based pitch design showed a good correlation with the experimental results. In the case of duct design, the duct angle is determined by aligning the flow direction through CFD computation [26], and NSMB Nozzle 19A was adopted for the present foil shape. A parametric study of the duct and the stator was conducted with variations in diameter, a taper ratio of a stator, length and thickness of duct, and so on.…”

Section: Design Of Ring Statormentioning

confidence: 99%

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Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Kang

Kim

Shin

2022

JMSE

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This study is a parametric investigation of the application of a compact type of pre-swirl duct for a slender aft-body 158k crude oil carrier. The International Maritime Organization (IMO) has created the Energy Efficiency Design Index (EEDI), which is an index related to carbon dioxide emissions, to enforce regulations on newly built ships; many solutions have been proposed, including an increase in propulsion efficiency. In the present study, a new type of energy-saving device (pre-swirl duct), the so-called ring stator, is proposed for 158k crude oil carriers, the hull form of which has been developed as a slender after-body full form to reduce the resistance by delaying separation. A conventional pre-swirl duct is no longer effective at the slender aft-body hull forms because of the small radial flow to the propeller. A parametric study was conducted through Computational Fluid Dynamics (CFD) analysis using the commercial program Star-CCM+, and an improvement of approximately 3% in the propulsion efficiency was achieved in the present study. The efficiency gain was validated through a comparison with the experimental results. The developed ring stator may become applicable to container ships through further parametric studies in the near future.

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Section: Investigation Of Wake and Validationcontrasting

confidence: 90%

“…The developed pre-swirl duct was successfully applied to 176K bulk carriers [26]. An efficiency gain of approximately 8% was obtained using the developed PSD.…”

Section: Investigation Of Wake and Validationmentioning

confidence: 99%

Section: Design Of Ring Statormentioning

confidence: 99%

Section: Design Of Ring Statormentioning

confidence: 99%

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Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Kang

Kim

Shin

2022

JMSE

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Investigation of Applying Technical Measures for Improving Energy Efficiency Design Index (EEDI) for KCS and KVLCC2

Park¹,

Jung²,

Seo³

2023

J. Ocean Eng. Technol.

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While extensive research is being conducted to reduce greenhouse gases in industrial fields, the International Maritime Organization (IMO) has implemented regulations to actively reduce CO2 emissions from ships, such as energy efficiency design index (EEDI), energy efficiency existing ship index (EEXI), energy efficiency operational indicator (EEOI), and carbon intensity indicator (CII). These regulations play an important role for the design and operation of ships. However, the calculation of the index and indicator might be complex depending on the types and size of the ship. Here, to calculate the EEDI of two target vessels, first, the ships were set as Deadweight (DWT) 50K container and 300K very large crude-oil carrier (VLCC) considering the type and size of those ships along with the engine types and power. Equations and parameters from the marine pollution treaty (MARPOL) Annex VI, IMO marine environment protection committee (MEPC) resolution were used to estimate the EEDI and their changes. Technical measures were subsequently applied to satisfy the IMO regulations, such as reducing speed, energy saving devices (ESD), and onboard CO2 capture system. Process simulation model using Aspen Plus v10 was developed for the onboard CO2 capture system. The obtained results suggested that the fuel change from Marine diesel oil (MDO) to liquefied natural gas (LNG) was the most effective way to reduce EEDI, considering the limited supply of the alternative clean fuels. Decreasing ship speed was the next effective option to meet the regulation until Phase 4. In case of container, the attained EEDI while converting fuel from Diesel oil (DO) to LNG was reduced by 27.35%. With speed reduction, the EEDI was improved by 21.76% of the EEDI based on DO. Pertaining to VLCC, 27.31% and 22.10% improvements were observed, which were comparable to those for the container. However, for both vessels, additional measure is required to meet Phase 5, demanding the reduction of 70%. Therefore, onboard CO2 capture system was designed for both KCS (Korea Research Institute of Ships & Ocean Engineering (KRISO) container ship) and KVLCC2 (KRISO VLCC) to meet the Phase 5 standard in the process simulation. The absorber column was designed with a diameter of 1.2–3.5 m and height of 11.3 m. The stripper column was 0.6–1.5 m in diameter and 8.8–9.6 m in height. The obtained results suggested that a combination of ESD, speed reduction, and fuel change was effective for reducing the EEDI; and onboard CO2 capture system may be required for Phase 5.

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