• Title/Summary/Keyword: LNG fuel container

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A Study and Design on Tank Container for Fuel Tank of LNG Fueled Ship (LNG 연료 추진선의 연료 탱크로서 탱크컨테이너의 적용성 연구 및 구조설계)

  • Kim, Tae-Woo;Suh, Yong-Suk;Jang, Ki-Bok;Chun, Min-Sung;Lee, Kang-Dae;Cha, Kyong-Ho
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.6
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    • pp.504-511
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    • 2012
  • The objective of this study is to investigate tank container to be used as fuel tank for LNG fueled ship. Feasibility of tank container to the fuel tank of LNG fueled ship is addressed and the advantage of tank container as fuel tank of ship is investigated. Conceptual configuration of the tank container is designed as well as structural analyses based on finite element method are carried out to meet the design regulation suggested by shipping register. Static loading is considered by structural analysis and impact test is performed. It is necessary to require SRS(shock response spectrum) in order to investigate structural safety which can meet.

Crash Safety Evaluation of LNG Fuel Containers for Vehicles using ANSYS Explicit Dynamics (ANSYS Explicit Dynamics 해석을 활용한 차량용 LNG 용기의 충돌안전성 평가)

  • Nam, SuHyun;Kim, JiYu;Kim, EuiSoo
    • Journal of the Korean Institute of Gas
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    • v.26 no.4
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    • pp.58-63
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    • 2022
  • With the emergence of environmental problems caused by fine dust worldwide, LNG, which is cheaper and less pollution than diesel, is attracting attention as the next generation energy of automobiles and is expanding its supply. However, it is difficult to operate smoothly due to the lack of infrastructure for LNG charging stations in Korea and the limited size of containers that can be installed according to regulations. In Korea, research and development on the contents of containers for the smooth operation of natural gas vehicles are underway, but there is a problem that the container directly receives the impact of the vehicle collision and explodes, causing a major disaster. Therefore, in this study, the safety of the container was verified by deriving the strain and stress values through ANSYS Explicit Dynamics analysis. As a result, a maximum stress of 565.37MPa occurred in the container, and it is expected that plastic deformation will occur as it exceeds the yield stress of STS304 used as a material for the container, which is beyond 505MPa. When an impact caused by a collision between a vehicle and a container is applied, it is considered necessary to design a support or reinforcement because the container may be damaged or defective.

A Study of Thermo-structural Analysis and Fatigue Analysis for Independent Type-B LNG Fuel Tank (독립형 B타입 LNG 연료 탱크의 열-구조 연성해석 및 피로 해석에 관한 연구)

  • Kim, Tae-Wook;Kim, Jong-Min;Kim, Jong-Hwan;Lee, Jeong-Ho;Park, Seong-Bo;Lee, Sung-Min;Lee, Jae-Myung
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.5
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    • pp.410-419
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    • 2016
  • With the aim of reducing greenhouse gas emissions by 20 percent by 2020 and by 50 percent by 2050 from their 2005 level, International Maritime Organization (IMO) regulated the emissions of SOx and NOx by setting the emission control area in 2012. Since these environmental regulations have been reinforced, demands for the LNG fuel ships are expected to increase dramatically. Accordingly, the worldwide shipbuilding companies spur the development of the LNG fueled ships. Therefore, it is essential to carry out the research on the development of LNG fuel tank, which is one of the important components of the LNG fuel supply system. In this study, the deliberate finite element analysis of type-B LNG fuel tank for 10,000 TEU containership was carried out to evaluate structural safety and provide the process for analyzing stress levels and evaluating fatigue life of target structural. In particular, thermo-structural analysis and fatigue analysis were carried out using the databases on materials and structures of LNG fuel tank.

Estimation of explosion risk potential in fuel gas supply systems for LNG fuelled ships (액화 천연 가스 연료 선박의 연료 공급 장치 폭발 잠재 위험 분석)

  • Lee, Sangick
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.918-922
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    • 2015
  • As international environmental regulations for pollutant and greenhouse gas emissions discharged from ships are being reinforced, it is drawing attention to use LNG as ship fuel. This paper compares the explosion risk potential in the LNG fuel gas supply systems of two types used in marine LNG fuelled vessels. By selecting 8500 TEU class container ships as target, LNG storage tank was designed and pressure conditions were assumed for the use of each fuel supply type. The leak hole sizes were divided into three categories, and the leak frequencies for each category were estimated. The sizes of the representative leak holes and release rates were estimated. The release rate and the leak frequency showed an inverse relationship. The pump type fuel gas supply system showed high leak frequency, and the pressure type fuel gas supply system showed high release rate. Computational fluid dynamics simulation was applied to perform a comparative analysis of the explosion risk potential of each fuel supply system.

A Study on the Quantitative Risk Analysis Using CFD for the Fuel Gas Supply System of Gas Fueled Ship (가스추진선박의 가스연료공급시스템에 대한 CFD를 이용한 정량적 위험도 해석에 관한 연구)

  • Kim, Kipyoung;Kim, Daeheon;Lee, Youngho
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.1
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    • pp.1-9
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    • 2017
  • LNG has significant advantages in regard to environmental aspects comparing with conventional fuel oil. In fact, it is estimated that NOx and SOx emission can be reduced by about 90% and 100%, respectively in case of using LNG as a fuel. LNG-fuelled ship has been considered to be the best option both from an environmental and an economic point of view. Along with these trends, some major shipyards and Classification Societies have started to carry out the risk-based system design for LNG-fuelled ship such as passenger ship, platform supply vessel and large container vessel etc. However, new conceptual gas fuelled ship has high risk level compared with vessel using traditional crude oil especially in view of gas explosion accident. Therefore safety area where installed fuel gas supply system is required risk based system design with special considerations. On this paper, the entire process necessary for the quantitative risk analysis was explained to meet the satisfactory safety level of gas fuelled ship.

A Study of the Localization Development of Cryogenic Submerged Pump for the Fuel Supply system of 600-Liter-Grade LNG Vehicles (600L급 LNG 차량 연료공급용 초저온 액중펌프 국산화개발에 관한 연구)

  • Kim, Yong Gil;Kim, Do Hyun;Lee, Won Young;Yi, Chung Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.4
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    • pp.113-118
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    • 2021
  • In this study, localized development of a submerged cryogenic pump for use in LNG containers is conducted with large-sized commercial vehicles as the target. The submerged pump installed in an LNG storage container is the key module that supplies fuel to the engine through the reciprocating motion of a piston. Research and development on 660-L fuel containers is performed herein. The target is to achieve a mileage of 600 km or more by applying it to major NGV vehicles worldwide. In this manner, the present study aims to verify the operating mechanisms of the major parts of currently advanced products through reverse engineering in the early development process and draw basic design data.

CFD Approach on Gas Explosion for SIL in Gas Fuelled Ship

  • Kim, Ki-Pyoung;Kim, You-Taek;Kang, Ho-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.2
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    • pp.195-200
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    • 2015
  • It is envisaged that the effect of increasingly stricter air emissions legislation implemented through IMO Annex VI and other local air quality controls, together with favorable financial conditions for the use of natural gas instead of liquid fuel oil as a bunker fuel, will see an increasing number of DF engine and single gas fuel engine applications to LNG carriers and other vessel types. As part of provision for the current international movements in the shipping industry to reduce GHG emission in air, new design concepts using natural gas as an alternative fuel source for propulsion of large commercial vessels, have been developed by shipyards and research institutes. In this study, an explosion analysis for a gas supply machinery room of LNG-fuelled container ship is presented. The gas fuel concept is employed for the high pressure ME-GI where a leakage in the natural gas double supply pipe to the engines is the subject of the present analysis. The consequences of a leak are simulated with computational fluid dynamics (CFD) tools to predict typical leak scenarios, gas cloud sizes and possible explosion pressures. In addition, capacity of the structure which is subject to explosion loads has been assessed.

A Study on the Emission Characteristics of LNG-diesel Dual-fuel Engine for Euro 2 Standard (Euro 2 기준 LNG-경유 혼소엔진의 배출가스 특성에 관한 연구)

  • Cho, Gyu-Baek;Kim, Chong-Min;Kim, Dong-Sik;Kim, Hong-Suk
    • Journal of the Korean Institute of Gas
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    • v.15 no.1
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    • pp.9-14
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    • 2011
  • Heavy duty diesel engine has relatively small portion of whole vehicles due to long drive distance and large engine displacement, but largely influences atmosphere environment. City buses changed to CNG (Compressed Natural Gas) bus with Korea-Japan Worldcup. Heavy duty truck and intercity bus, however, were impossible to use CNG because those kinds of vehicles had long drive distance and CNG station was installed mainly at the around of the bus garage of city. Insulation container storing the natural gas as a liquid makes heavy duty truck and intercity bus possible to use the natural gas. Drive using diesel is possible where is hard to recharge the gas. With LNG (Liquefied Natural Gas), the dependence on oil is largely decreased, PM (Particulate Matter) and NOx which is chronic disadvantage of diesel is remarkably reduced and finally $CO_2$, the representative green house gas, is reduced over 10%.

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

  • Jun-Yup Park;Jong-Yeon Jung;Yu-Taek Seo
    • Journal of Ocean Engineering and Technology
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    • v.37 no.2
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    • pp.58-67
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    • 2023
  • 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.

A Study on the Variation of Physical Properties of Line-heated for Type-B LNG Fuel Tank with 9% Nickel Steel Plate (9% Nickel강이 적용된 Type-B LNG 연료탱크 선상가열의 물성 변화에 관한 연구)

  • Choi, Kyung-Shin;Lee, Ji-Han;Hong, Ji-Ung;Chung, Won-Jee
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.7
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    • pp.89-97
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    • 2020
  • Container vessels continue to grow in size, led by global shipowner. Large ships can be loaded more cargo at a time, reducing the cost of transportation per teu. this eventually leads to economies of sale, in which the production cost per unit decreases with increasing output. in accordance with the 70th Convention of the Marine Environment Protection Committee of the International Maritime Organization, as of January 1, 2020, MARPOL Annex VI Regulation 14.1.3 will be effective. All vessels must be meet these criteria to reduce Sox emissions and reduce NOx emissions by reducing the content of manned sulfur oxides from 3.5% to less than 0.5%, otherwise IACS Member States Entry to the port is denied. in order to do that need to LNG storage tank. in this study characteristic of the material after line heating (600℃,700℃,800℃,900℃) of 9% Ni steel used in the manufacture of LNG fuel tank of ship were verified using by mechanical test. In the heating method by line heating. The initial properties of steel are changed by variables such as temperature, time, speed. The experimental data of line heating presented in this paper confirmed that the initial change of 9% Ni steel could be minimized.