• Title/Summary/Keyword: 재기화 시스템

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An analysis on the characteristics of regasification system for LNG-FSRU depending on the changes in performance with vaporization and temperature of the heat source (LNG-FSRU용 재기화 시스템의 열원 온도 및 기화성능의 변동에 따른 시스템 특성분석)

  • Lee, Yoon-Ho;Kim, You-Taek;Kang, Ho-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.6
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    • pp.625-631
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    • 2014
  • In this study, according to increase of thermoelectric power plants that use LNG, LNG-FSRU(Floating-Storage and Regasification Unit) appeared and it is installed on the Topside in order to deliver in a gaseous state to consumers who are in the shore. This study about the study on the characteristics analysis of the system depending on changes in performance with the vaporization and temperature of the heat source. For the characteristics analysis of the system, we devided vaporization method into Ethylene glycol water vaporization method and sea water as a heat source. Then the system that can vaporize 200ton per hour of LNG of $-157.9^{\circ}C$ and 10,400kPa was configured, and according to the temperature of supplied sea water, required minimum flow rate value was calculated. Also in case of using Ethylene glycol Water as a vaporization method, providing for regional and seasonal factors such as decrease of temperature of water. The system is configured by adding a steam boiler of $174.5^{\circ}C$, 775kPa as heat source. The generation amount of the steam required according to the performance of the vaporizer compared to the water temperature changes in the steam boiler and the amount of required evaporative performance due to changes in the quantity of steam and Ethylene glycol Water was confirmed.

An analysis on the characteristics of regasification system for gas fuelled ship depending on the mixing ratio of eglycol and water (Gas Fuelled Ship용 재기화 시스템의 Eglycol Water 혼합비율에 따른 시스템 특성분석)

  • Lee, Yoon-Ho;Kim, You-Taek;Kang, Ho-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.7
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    • pp.799-805
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    • 2014
  • Recently, the regulations of the Local and Global for a variety of air pollution prevention has been enhanced by the steep rise in fuel oil prices. So, the appearance of Gas Fuelled Ships became necessary. In this study, we configured a regasification system which uses Eglycol water as a heating medium to evaporate before being supply fuel to the DF engine, then we analysed the system properties according to the Eglycol water mixing ratio. The results were as follows. When pressure, temperature, and flux of natural gas(NG) which are supplied to DF engines are uniformly kept, the higher mixing ratio of Eglycol is, the lower mixing specific heat of Eglycol water. And the cycle flux and electric power were 1.65 and 1.54 times more required. respectively, than water was used as the heating medium. Basic variables including mass flux according to the mixing ratio of Eglycol water, required electric power of operating fluid pumps, the temperature of natural gas which is supplied to the engine, and the heat exchanger's capacity were drawn from the gotten results.

Simulation Study on Liquid Air Energy Storage (LAES) System using Dual Refrigeration Cycles and Thermal Oil Circulation (냉매사이클과 열매체유 순환을 활용한 액화공기에너지저장 시스템 공정모사 연구)

  • Jang, Soonnam;Park, Jongpo
    • Journal of the Korean Institute of Gas
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    • v.22 no.4
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    • pp.63-73
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    • 2018
  • Innovative technical process for Energy Storage System (ESS), Liquid Air Energy Storage system (LAES) is mature technologies based on the gas liquefaction process. In spite of many advantages such as high energy density, no geographical constraints, low investment costs and long useful life, the system has not yet widely commercialized due to low round trip efficiency. To improve RTE and acquire high yield of liquid air, various configurations of LAES process have been considered. In this research, dual refrigerants cycle (R-600a and methanol) for air liquefaction and thermal oil circulation for power generation via liquid air gasification have been applied to improve cycle performance significantly using Aspen HYSYS simulator.

Analysis of the Impact of Fire and Explosion Accidents due to LNG Leaks in the LNG Re-gasification Process (LNG 재기화 공정에서 LNG 누출에 따른 화재 및 폭발사고의 피해영향 분석)

  • Lee, Yoon-Ho
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.6
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    • pp.825-833
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    • 2018
  • In this study, one calculated the range of damage to the combustion characteristics according to the composition of LNG and the size of leaking holes, and analyzed the damage effect in case of leakage accidents caused by pipe damage in the re-gasification process for the LNG supply system. In order to confirm the combustion characteristics according to LNG composition, there was no significant difference in the result of risk analysis by LNG-producing areas. However, the higher the methane content of the components, the lower the risk of flash fire, hazardous areas of overpressure due to explosion, and thermal radiation damage caused by jet fire. In addition, one investigated the effect of leakage, holes, and ruptures on the risk range and explosions according to the size of the pipe-leakage hole. Also, the influence of overpressure and the range of damage from radiant heat could be predicted. One confirmed the effect of LNG composition and pipe-leakage size on fire and explosion.

Effects of Opening Condition of the Fore Body on the Resistance and Self-Propulsion Performance of a Ship (일반상선의 선수 개구부가 저항 및 자항성능에 미치는 영향)

  • Park, Dong-Woo
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.1
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    • pp.78-85
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    • 2014
  • LNG-RV has the additional equipments that enable to re-gastify liquefied LNG in LNG carrier. This vessel has Submerged Turret Loading(STL) system which transports gas through submarine terminal. When LNG-RV is operating at sea, the opening condition is formed by detaching STL equipment from a vessel. The primary objective of the current work is to estimate accurate speed loss for the opening condition of the LNG-RV employing numerical calculations and model tests. In the model tests, resistance and self-propulsion tests are carried out for the bare-hull and the opening condition without STL. In addition to these, flow visualization utilizing tuft is used to make the flow patterns visible, in order to get a qualitative or quantitative information for inner part in case of detaching the STL.

AutoML and Artificial Neural Network Modeling of Process Dynamics of LNG Regasification Using Seawater (해수 이용 LNG 재기화 공정의 딥러닝과 AutoML을 이용한 동적모델링)

  • Shin, Yongbeom;Yoo, Sangwoo;Kwak, Dongho;Lee, Nagyeong;Shin, Dongil
    • Korean Chemical Engineering Research
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    • v.59 no.2
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    • pp.209-218
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    • 2021
  • First principle-based modeling studies have been performed to improve the heat exchange efficiency of ORV and optimize operation, but the heat transfer coefficient of ORV is an irregular system according to time and location, and it undergoes a complex modeling process. In this study, FNN, LSTM, and AutoML-based modeling were performed to confirm the effectiveness of data-based modeling for complex systems. The prediction accuracy indicated high performance in the order of LSTM > AutoML > FNN in MSE. The performance of AutoML, an automatic design method for machine learning models, was superior to developed FNN, and the total time required for model development was 1/15 compared to LSTM, showing the possibility of using AutoML. The prediction of NG and seawater discharged temperatures using LSTM and AutoML showed an error of less than 0.5K. Using the predictive model, real-time optimization of the amount of LNG vaporized that can be processed using ORV in winter is performed, confirming that up to 23.5% of LNG can be additionally processed, and an ORV optimal operation guideline based on the developed dynamic prediction model was presented.

A Study on the Development of the Upper Intelligent Control System using the Object Oriented Method (객체 지향 방법론을 이용한 상위 지능형 제어 시스템 개발에 관한 연구)

  • Lee, Bong-Kuk;Hwang, Jae-Ki;Shin, Yong-Hak
    • Proceedings of the KIEE Conference
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    • 2001.11c
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    • pp.123-126
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    • 2001
  • 종합적인 공정 제어 자동화 시스템 구현을 위해 계층적이고 개방형 방식에 의한 시스템 구축이 이루어지고 있다. 상위 계층 시스템은 하위 계층 제어 시스템의 제어기 설정치를 결정하는 방법으로 다양한 의사결정(Decision Making)방법을 도입하여 하위 계층 시스템과 연계하여 계층적인 종합 공정 제어 자동화 시스템 구축을 시도하고 있다. 본 연구에서는 상위 계층 시스템 구현을 위해 신경회로망 방식을 채택한 상위 지능형 제어 시스템을 제안하여 연속형 프로세스의 최적 의사 결정을 효과적으로 할 수 있도록 하였고 이를 실현화 하는데 있어 UML방식의 객체지향 설계방식을 도입함으로써 시스템의 재 사용성 및 확장성을 가지는 개방형 상위 의사 결정 시스템을 개발하였다. 개발된 시스템을 수처리 연속 공정인 약품주입 공정에 적용하였다.

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Fault-Tolerant Database System for managing Wind Turbine Control System (무중단의 풍력 발전 시스템 관리를 위한 고가용성 데이터베이스 시스템)

  • Kim, Young-Hwan;Son, Jae-Gi;Ham, Kyung-sun
    • Proceedings of the Korea Information Processing Society Conference
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    • 2012.04a
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    • pp.56-59
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    • 2012
  • 최근 신재생 에너지 분야 가운데 풍력발전에 대한 관심이 높아지면서 관련 산업 분야의 연구 또한 활발히 수행되고 있다. 풍력발전기의 경우 초기 설치에 고가의 비용이 필요하며, 고장 발생 시 일반적으로 풍력발전기의 동작을 멈추게 한다. 본 논문에서는 풍력발전기의 Nacelle에서 발생하는 다양한 센서데이터를 수집하는 Bottom에서의 제어시스템을 다중화하여 고장 발생 시에도 풍력발전기의 중단 없이 지속적으로 에너지 생산이 가능하게 하는 고가용성 데이터베이스 시스템에 관한 것이다. 본 논문을 통해 개발된 고가용성 시스템을 통해 풍력 발전기의 높은 안정성을 보장하며, 수집된 데이터를 분석함으로서 고장에 대한 예측이 가능하다.

Research of Design Improvement regarding Foundation Technologies for Floating LNG (Floating LNG 기반기술에 관한 설계개선 연구 (철회된 논문입니다.))

  • Lee, Dong-Hyun;Ha, Mun-Keun;Kim, Soo-Young;Shin, Sung-Chul
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.3
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    • pp.220-230
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    • 2014
  • Typical technical issues associated with Floating LNG (FLNG: FSRU and LNG FPSO) design are categorized in terms of global performance evaluation. Although many proven technologies developed through LNG carrier and oil FPSO projects are available for FLNG design, we are still faced with several technical challenges to clear for successful FLNG projects. In this paper, some of the challenges encountered during development of the floating LNG facility (i.e. LNG FPSO and FSRU) will be reviewed together with their investigated solution. At the same time, research of design improvement including new LNG-related technologies such as combined containment system will be presented to overcome the unrevealed challenges for the FLNG development.