• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.9
• /
• pp.918-922
• /
• 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.

• Journal of the Korean Institute of Gas
• /
• v.8 no.1 s.22
• /
• pp.7-12
• /
• 2004

In the quality control of the aerosol skincare products containing powders, it is essential to guarantee that the contents in the bottle can be completely used without leakage or clogging of the nozzle. In this paper, the clogging caused by powder was investigated and the clogging can be effectively removed by emulsifying the contents containing powder with the LPG using a proper surfactant. And the spraying test shows that the contents in the bottle are completely propelled to outside by LPG when properly emulsified by POE(40) HCO.

• Journal of Energy Engineering
• /
• v.5 no.2
• /
• pp.176-182
• /
• 1996

The effects of some additives (black liquor, NaOH, water and wood) on the conversion of coal and product were investigated in the lab-scale, high pressure reacting system around 375$^{\circ}C$. The addition of black liquor enhances the coal conversion yield about 38.6%, which is mainly due to NaOH in black liquor. Also, sulfur of the black liquor in coal liquefaction process evolved hydrogen sulfide, which causes the odor problem. Addition of water in coal liquefaction increased CO$_2$content in the gas phase, and low boiling range components in liquid products. Coprocessing of wood and coal at 400$^{\circ}C$ increased yield of liquid product about 8%, but higher temperature above 400$^{\circ}C$ reduced liquid product due to increase of gas products.

• 한국신재생에너지학회:학술대회논문집
• /
• 2006.06a
• /
• pp.403-406
• /
• 2006

최근 막대한 매장량으로 인해 미래의 비재래형 에너지원으로 주목받고 있는 천여가스 하이드레이트는 고압 저온 환경에서 수소결합을 하는 고체상 격자 내에 객체분자인 가스분자가 포획되어 형성된 가스하이드레이트의 일종으로 영구 동토지역과 심해저의 퇴적층에 광범위하게 분포되어 있다. 본 연구에서는 이러한 가스하이드레이트의 개발기술과 천연가스의 저장과 운송기술에 관한 미국 일본 유럽 등 특허 3극 및 한국 특허 총 357건을 추출하고 특허정보 분석을 실시하여 국내외 기술개발 동망 및 기술변화 추이를 살펴보았다. 특허 검색에 사용된 DB와 분석도구는 특허청 선행기술 전문조사기관 등으로 지정된 (주)윕스사의 WIPS와 ThinKlear이며, 미국/일본/유럽 등 특허 3극과 한국에서 공개 또는 등록된 특허를 검색대상으로 하였다 자원으로서 천연가스 하이드레이트를 개발하는 기술과 관련하여 총 193건의 특허가 추출되었으며, 이 때 사용하는 방법에는 감압법, 열처리법, 억제제 주입법 등이 있었다. 또한 연료용 가스, 특히 메탄가스의 수송 및 저장에는 통상 액화하여 액화천연가스로 수송하는 방법이 사용되고 있으나 가스하이드레이트를 이용할 경우 액화천연가스를 이용하는 것보다 더 경제적임이 보고되면서 이와 관련된 연구가 활발히 진행 중이며, 총 164건의 특허가 추출되었다. 상기 추출된 총 357건을 대상으로 연도별 출원동향, 국가별 점유율 및 시계열 분석, 분류기술별 출원동향 등의 특허정보 분석을 수행하였다.

• Proceedings of KOSOMES biannual meeting
• /
• 2017.11a
• /
• pp.181-181
• /
• 2017

• Journal of the Korean Institute of Gas
• /
• v.13 no.6
• /
• pp.44-48
• /
• 2009

In this paper, two different types of natural gas liquefaction cycle with 2 staged compression were designed and simulated to develop liquefaction process which is the core technology in the Industry of natural gas liquefaction plant. These include the cascade cycle with inter-cooler which is consisted of propane, ethylene and methane cycle. One of these is that liquid-gas heat exchanger is applied to between methane and ethylene cycles, and another is that liquid-gas heat exchanger is added to between ethylene and propane on the above process. Also, these cycles are compared with two staged cascade process using an inter-cooler. The COP of process2 is shown about 14.0% higher than that of process1, respectively. Also, the yield efficiency of LNG improved comparing with process1 with 11.5% lower specific power.

• LP가스
• /
• v.21 no.3
• /
• pp.24-45
• /
• 2009

• LP가스
• /
• v.21 no.3
• /
• pp.18-23
• /
• 2009

• LP가스
• /
• v.21 no.5
• /
• pp.16-24
• /
• 2009

• LP가스
• /
• v.21 no.2
• /
• pp.53-57
• /
• 2009