• Title/Summary/Keyword: 가스추진선

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전환기 국내 가스산업의 진로

  • 박달영
    • Journal of Energy Engineering
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    • v.8
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    • pp.74-85
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    • 1999
  • 우리 나라는 1970년대에 두 차례에 걸친 석유 파동을 겪으면서 에너지 정책의 중점 방향을 에너지 수요 관리와 안정적 에너지 공급 기반 조성 등으로 삼았다. 특히 에너지의 안정적 공급을 위하여 에너지원의 다원화, 수입선 다변화, 그리고 해외자원 개발 등이 추진되었다. 이러한 에너지 정책의 일환으로 천연가스의 도입이 적극 추진되어, 1983년 8월 한국가스공사가 설립되었으며, 1986년 10월 국내 최초로 액화천연가스(LNG)가 수입되고 다음달부터 공급되기 시작하였다. (중략)

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Comparison and Analysis of Small Gas Turbine Performance Deck and Experimental Result (소형 가스터빈엔진의 천이상태 모사와 시험결과 비교분석)

  • 전용민;양인영;남삼식;김춘택;양수석;이대성
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2002.04a
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    • pp.28-28
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    • 2002
  • 가스터빈 엔진을 운용하는 데 있어서 가/감속율을 크게 하면 엔진성능 천이 시간은 짧으나 압축기에서의 서지나 터빈 입구온도의 급격한 상승이 발생할 수 있으며 가/감속율을 작게 하면 엔진은 안정적이나 천이시간이 길어지게 되어 결과적으로 엔진의 동적 응답성이 나빠지게 된다. 또한 압축기에서 발생할 수 있는 서지를 방지하기 위하여 압축기 서지 마진이 l0%∼20%인 서지 한계선(조정선)을 설정하여 엔진이 서지 한계선을 넘지 않도록 제어한다.

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A Study for the Application of Ammonia Propulsion Model: Focusing on the Training Ship (암모니아 추진 모델 적용을 위한 연구: 실습선을 중심으로)

  • GA-YOUNG YANG;JAE-WOO AHN;SUNG-BIN HONG;KANG-HYEON KIM;JAE-MIN PARK;BO RIM RYU;HO KEUN KANG
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.11a
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    • pp.156-157
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    • 2022
  • Currently, due to the increase in GHG emissions, the global weather phenomenon is constantly occurring, and each international organization is trying to reduce 온실가스 through various regulations to reduce GHG. To comply with the regulations, eco-friendly ships are currently being studied to reduce GHG. This paper models the fuel propulsion system of NH3 sofc fuel cell propulsion ship through the case study of eco-friendly ships, especially NH3 fuel cells, and provides information on how NH3 sofc fuel cell propulsion ships can benefit energy efficiency and decarbonization compared to existing FO vessels.

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Design and Assessment of Reliquefaction System According to Boil Off Gas Reliquefaction Rate of Liquefied Hydrogen Carrier (액화수소 운반선의 증발가스 재액화 비율에 따른 재액화 시스템의 설계 및 평가)

  • Cho, Wook-Rae;Lee, Hyun-Yong;Ryu, Bo-Rim;Kang, Ho-Keun
    • Journal of Navigation and Port Research
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    • v.44 no.4
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    • pp.283-290
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    • 2020
  • BOG (Boil Off Gas) generation is unavoidable in the liquefied hydrogen carrier, and proper measures are necessary to prevent pressure problems inside the cargo tank. The BOG can be used as propulsion fuel for ships, and the remaining parts used for propulsion must be effectively managed, such as in the form of reliquefying or burning. This study proposes an BOG reliquefaction system optimized for a 160,000 m3 liquefied hydrogen carrier with a hydrogen propulsion system. The system comprises a hydrogen compression and helium refrigerant section, and increases the efficiency by effectively using the cold energy of the BOG discharged from the cargo tank. In this study, the system was evaluated through the exergy efficiency and SEC (Specific Energy Consumption) analysis according to the rate of the reliquefaction of the BOG while the hydrogen BOG with a supply temperature of -220℃ entered the reliquefaction system. As a result, it showed SEC of 4.11 kWh/kgLH2 and exergy efficiency of 60.1% at the rate of reliquefaction of 20%. And the parametric study of the effects of varying the hydrogen compression pressure, inlet temperature of the hydrogen expander, and the feed hydrogen temperature was conducted.

Optimal Gas Detection System in Cargo Compressor Room of Gas Fueled LNG Carrier (가스추진 LNG 운반선의 가스 압축기실에 설치된 가스검출장치의 최적 배치에 관한 연구)

  • Lee, Sang-Won;Shao, Yude;Lee, Seung-Hun;Lee, Jin-Uk;Jeong, Eun-Seok;Kang, Ho-Keun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.5
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    • pp.617-626
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    • 2019
  • This study analyzes the optimal location of gas detectors through the gas dispersion in a cargo compressor room of a 174K LNG carrier equipped with high-pressure cargo handling equipment; in addition, we propose a reasonable method for determining the safety regulations specified in the new International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC). To conduct an LNG gas dispersion simulation in the cargo compressor room-equipped with an ME-GI engine-of a 174 K LNG carrier, the geometry of the room as well as the equipment and piping, are designed using the same 3D size at a 1-to-1 scale. Scenarios for a gas leak were examined under high pressure of 305 bar and low pressure of 1 bar. The pinhole sizes for high pressure are 4.5, 5.0, and 5.6mm, and for low pressure are 100 and 140 mm. The results demonstrate that the cargo compressor room will not pose a serious risk with respect to the flammable gas concentration as verified by a ventilation assessment for a 5.6 mm pinhole for a high-pressure leak under gas rupture conditions, and a low-pressure leak of 100 and 140 mm with different pinhole sizes. However, it was confirmed that the actual location of the gas detection sensors in a cargo compressor room, according to the new IGC code, should be moved to other points, and an analysis of the virtual monitor points through a computational fluid dynamics (CFD) simulation.

Component Map Generation of a Gas Turbine Engine Using Genetic Algorithms and Scaling Method (유전자 알고리즘과 스케일링 기법을 이용한 가스터빈 엔진 구성품 성능선도 개선에 관한 연구)

  • Kho Seong-Hee;Kong Chang-Duk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2005.11a
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    • pp.299-303
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    • 2005
  • In the present study, in order to improve precision of the component characteristic maps generated by the scaling method, a map generation method which can produce a compressor map from some experimental performance data using GAs(Genetic Algorithms) was proposed. However, in case of the proposed map generation method only using GAs, because it has a drawback for estimating correctly the surge points and the choke points of the compressor map, a modified GAs method was additionally proposed through complementally use of the scaling method to determine obviously those points of the compressor map.

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A Study on Compressor Map Generation of a Gas Turbine Engine Using Hybrid Intelligent Method (하이브리드 기법을 이용한 가스터빈 엔진의 압축기 성능선도 생성에 관한 연구)

  • Kong, Chang-Duk;Kho, Seong-Hee;Ki, Ja-Young
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.4
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    • pp.54-60
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    • 2006
  • A method for generating the compressor map from some performance measuring data using the hybrid intelligent technique was newly proposed. In order to improve accuracy of the traditional scaling method, a method to generate the compressor map using the GAs(Genetic Algorithms) was previously proposed, but the method has a drawback that it can not find correctly surge and choke points of the compressor map. However, the proposed hybrid intelligent method can determine obviously those points as well as improve the accuracy of the compressor map through complementarily using the GAs and the scaling method.