• Title/Summary/Keyword: Liquefied Natural Gas(LNG)

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A Developing Tendency of Liquefied Natural Gas Carriers (액화천연가스 운반선(LNGC)의 발전 추세)

  • Lee, Dong-Sup
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.15 no.3
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    • pp.269-274
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    • 2009
  • Recently, the construction of Liquefied Natural Gas Carriers(LNGC) is being promoted larger and larger depending on long voyage. In 1950 years, $5,000m^3$ class of LNGC had been changed to $71,500m^3$ class in 1973. and to $210,000-266,000m^3$ class in 2007. Especially, the system of main engines and cargo control, Re-liquefaction of natural gases have become possible in LNGC. This research deals with the LNG projects, world markets of energy and developing tendency of liquefied natural gas carriers.

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A Study on Quantitative Risk Presentation of LNG Station (LNG충전시설의 위험도 표현에 관한 연구)

  • Ko, Jae-Wook;Yoo, Jin-Hwan;Kim, Bum-Su;Lee, Heon-Seok;Kim, Min-Seop
    • Journal of the Korean Institute of Gas
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    • v.13 no.1
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    • pp.61-67
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    • 2009
  • There are lots of energy facilities using gas(storage facility, compressed gas pipe, station, tank lorry) on the domestic. These major gas facilities cause major accidents associated with fire, explosion, toxic and etc. With the increased interest in reducing air pollution, supply of natural gas for gas vehicles is increasing. Thus, the number of establishments of LNG (Liquefied Natural Gas) and CNG(Compressed Natural Gas) stations is increasing as well. However, due to major gas accidents such as the fire and explosion accident of a Buchen LPG (Liquefied Petroleum Gas) station, it is difficult to establish a new station. In this research, we present quantitative risk assessment for LCNG;LNG multi-station and compare it result against individual risk criteria of HSE.

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The Determinants and their Time-Varying Spillovers on Liquefied Natural Gas Import Prices in China Based on TVP-FAVAR Model

  • Ying Huang;Yusheng Jiao
    • Journal of Information Processing Systems
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    • v.20 no.1
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    • pp.93-104
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    • 2024
  • China is playing more predominant role in the liquefied natural gas (LNG) market worldwide and LNG import price is subject to various factors both at home and abroad. Nevertheless, previous studies rarely heed a multiple of factors. A time-varying parameter factor augmented vector auto-regression (TVP-FAVAR) model is adopted to discover the determinants of China's LNG import price and their dynamic impacts from January 2012 to December 2021. According to the findings, market fundamentals have a greater impact on the import price of natural gas in China than overall economic demand, financial considerations, and world oil prices. The primary determinants include domestic gas consumption, consumer confidence and other demand-side information. Then, there are diverse and time-varying spillover effects of the four common determinants on the volatility of China's LNG import price at different intervals and time nodes. The price volatility is more sensitive and long-lasting to domestic natural gas pricing reform than other negative shocks such as the Sino-US trade war and the COVID-19 pandemic. The results in this study further proves the importance of domestic natural gas market liberalization. China ought to do more to support the further marketization of natural gas prices while working harder to guarantee natural gas supplies.

A study on the mechanical performance of impregnated polymer foam in cargo leakage of LNG carrier (LNG운반선의 화물 누출 시 함침된 고분자 폼의 기계적 성능에 관한 연구)

  • Park, Gi-Beom;Kim, Tae-Wook;Kim, Seul-Kee;Lee, Jae-Myung
    • Journal of Advanced Marine Engineering and Technology
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    • v.41 no.4
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    • pp.345-352
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    • 2017
  • In this study, the effect of cryogenic liquefied natural gas leakage and loading on liquefied natural gas cargo hold is investigated to observe the performance of the polymer foam material that comprises the cryogenic insulation of the cargo hold. The primary barriers of liquefied natural gas carrier that are in contact with the liquefied natural gas will leak if damage is accumulated, owing to fluid impact loads or liquefied natural gas loading / unloading over a long period. The leakage of the cryogenic fluid affects the interior of the polymer foam, which is a porous closed cell structure, and causes a change in behavior with respect to the working load. In this study, mechanical properties of polyisocyanurate foam specimen, which is a polymer material used as insulation, are evaluated. The performance of the specimens, owing to the cold brittleness and the impregnation effects of the cryogenic fluids, are quantitatively compared and analyzed.

Electrical system design in FLNG offshore unit

  • Kim, Jong-Su;Kim, Deok-Ki
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.10
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    • pp.1037-1043
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    • 2015
  • In recent years, Floating Liquefied Natural Gas (FLNG) Unit have attracted considerable attention. Generally, liquefied natural gas (LNG) units are produced in onshore liquefaction terminals from gas supplied from onshore gas fields or large-scale offshore gas fields near the coast. However, the development of these gas fields has approached saturation. Large-scale offshore gas fields far from the coast, as well as undeveloped medium- and small-scale offshore gas fields, have recently attracted attention. Among several proposed concepts, the floating LNG plant in the form of the FLNG system was chosen for further evaluation and development, considering worldwide receiving infrastructure. The design of a 2.5 million tonne per annum FLNG unit has been completed with a capacity corresponding to that of modern onshore liquefaction plants. Various simulation tests were performed to evaluate the performance of the electrical power plant, focusing on the efficiency of the electrical system to secure the aspects of plant safety. This design study analyzes the electrical system for the FLNG unit to improve the safety of operation and maintenance in the field.

Deep learning neural networks to decide whether to operate the 174K Liquefied Natural Gas Carrier's Gas Combustion Unit

  • Sungrok Kim;Qianfeng Lin;Jooyoung Son
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.11a
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    • pp.383-384
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    • 2022
  • Gas Combustion Unit (GCU) onboard liquefied natural gas carriers handles boil-off to stabilize tank pressure. There are many factors for LNG cargo operators to take into consideration to determine whether to use GCU or not. Gas consumption of main engine and re-liquefied gas through the Partial Re-Liquefaction System (PRS) are good examples of these factors. Human gas operators have decided the operation so far. In this paper, some deep learning neural network models were developed to provide human gas operators with a decision support system. The models consider various factors specially into GCU operation. A deep learning model with Sigmoid activation functions in input layer and hidden layers made the best performance among eight different deep learning models.

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Development of Algorithm to Predict the Superheat-limit Explosion(SLE) Conditions of LNG Using Continuous Thermodynamics (연속열역학을 이용한 액화천연개스(LNG)의 과가열약체 폭발현상 예측에 대한 연구)

  • Shin, Goun-Soup;Kwon, Yong-Jung
    • Journal of Industrial Technology
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    • v.15
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    • pp.5-13
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    • 1995
  • Natural gas, which is getting more important as a fuel, should be liquefied and shipped in a special tank. During transportation, a spill of liquefied natural gas(LNG) could occur by a collision or even an accident. As a result, violent explosion called the superheat-limit explosion(SLE) can take place in some cases, unexpectedly. Such explosion may result from the formation of a superheated liquid which has attained the superheat-limit temperature when hot(water) and cold(LNG) liquids come into contact. Natural gas mixtures can be considered as discrete light components plus continuous heavy fractions where several continuous distribution function can be adopted. This work is aiming at prediction of the superheat-limit explosion condition by suing continuous thermodynamics development of algorithm to predict.

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Third Wave of Gas Management System in LNG Carrier - VaCo System (LNG 운반선에서의 신개념 증발 가스 처리 시스템 - VaCo 시스템)

  • Choi, Jung-Ho;Yoo, Hong-Sung;Yoo, Kyung-Nam;Heo, An;Lee, Dou-Yeong;Lyy, Sung-Kak
    • Special Issue of the Society of Naval Architects of Korea
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    • 2007.09a
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    • pp.89-93
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    • 2007
  • The Boil-off gas (BOG) generation during the voyage is inevitable since Natural Gas (NG) in normally liquefied below -160 degree C in atmosphere condition and small heat ingress due to relatively hot outside keeps evaporating continuously. The one of major issue in LNG carriers is to handle generated BOG from cargo tank. The generated BOG affects to increase the cargo tank pressure and Gas Management System (GMS) for LNG carriers is closely related to cargo tank pressure maintenance. Economically, BOG is generally used as fuel in LNG carrier. Newly developed GMS for LNG carrier in boiler propulsion system, VaCo System, not only accomplish automatic control in GMS but also ensure safer operation.

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The BOG Handling System for LNG Carrier (LNG운반선의 BOG 처리설비)

  • Kim, M.E.;Kim, Y.T.
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.557-561
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    • 2005
  • In recent years, the LNGC fleet is expanded unprecedentedly. Ship's owners and shipbuilders are focusing on the idea how they choose the BOG handling system in economical, environmental and safety angles. This paper introduces general information for that and gives technical matters briefly.

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