• 제목/요약/키워드: 천연가스 하이드레이트

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동부 심해 울릉분지의 천연가스 하이드레이트 (Natural gas hydrates in the eastern deep-water Ulleung Basin)

  • 류병재;김지훈;정부흥;이영주
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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    • pp.610-612
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    • 2008
  • Piston cores retrieved from the eastern part of the deep-water Ulleung Basin were analyzed to access the potential of hydrocarbon gas generation and natural gas hydrate (NGH) formation. Seismic data acquired in the study area were also analyzed to determine the presence of hydrocarbon gas and/or NGH, and to map their distribution. Core analyses revealed high total organic carbon (TOC) contents which favor hydrocarbon generation. The cores recovered from the southern study area showed the sufficient residual hydrocarbon gas concentrations for the formation of significant NGH. These cores also showed the cracks developed parallel to the bedding that suggest significant gas content in situ. A number of seismic blanking zones were observed on seismic data. They are identified as vertical to sub-vertical chimneys caused by the upward migration of pore fluid or gas, and containing of free gas and/or NGH. Often, they are associated with velocity pull-up structures that are interpreted to be the result of high-velocity NGH. The seismic data also showed several bottom-simulating reflectors (BSRs) that are associated with overlying NGH and underlying free gas. The distribution of blanking zones and BSRs would be impacted by the lateral differences of upward methane fluxes.

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천연가스 고체화 수송을 위한 메탄 하이드레이트 충진율 증대에 대한 실험적 연구 (Experimental Investigation on the Enhancement of Methane Hydrate Formation in the Solid Transportation of Natural Gas)

  • 김남진;정재성;김종보
    • 설비공학논문집
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    • 제14권10호
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    • pp.863-870
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    • 2002
  • Fossil fuels have been depleted gradually and new energy resource which can solve this shortage is needed now. Methane hydrate, non-polluting new energy resource, satisfies this requirement and considered the precious resource prevent the global warming. Fortunately, there are abundant resources of methane hydrate distribute in the earth widely, so developing the techniques that can use these gases effectively is fully valuable. the work presented here is to develop the skill which can transport and store methane hydrate. As a first step, the equilibrium point experiment has been carried out by increasing temperatures in the cell at fixed pressures. The influence of gas consumption rates under variable degree of subcooling, stirring and water injection has been investigated formation to find out kinetic characteristics of the hydrate. The results of present investigation show that the enhancements of the hydrate formation in terms of the gas/water ratio are closely related to operational pressure, temperature, degrees of subcooling, stirring rate, and water injection.

트윈롤 시스템을 이용한 천연가스 하이드레이트 펠릿의 연속성형 (Study on the Continuous Forming of Natural Gas Hydrate Pellet using Twin Roll System)

  • 이윤후;김흥수;고봉환;송명호
    • 한국기계가공학회지
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    • 제11권6호
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    • pp.152-157
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    • 2012
  • This study investigates compressive strength of ice pellet strip which is potential medium for Natural Gas Hydrate(NGH) extruded from die holes of Twin-roll Press for Continuous Pelletizing(TPCP). Recently, the prototype of TPCP is newly developed where ice powder is continuously fed and extruded into strip-type pellet between twin rolls. The system is specifically designed for future expansion towards mass-production of ice pellet strips or solid form of natural gas hydrate. It is shown that the compressive strength of pellet strip heavily depends on factors in extrusion process such as disk size, surface smoothness, ring size, taper shape, feeding mechanism, and rotational speed. Here, the mechanism of TPCP, along with compressive strength of pellets is discussed in terms of its feasibility for producing NGH pellets in the future.

비전통 치밀 가스 학술정보 분석 (Scientometric Analysis for Unconventional Tight Gas)

  • 이수진;길상철;김영인;오민수
    • 자원환경지질
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    • 제47권5호
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    • pp.551-561
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    • 2014
  • 세계 전체 천연가스 소비량은 2010년 113Tcf에서 2040년 185Tcf로 예상되는 가장 빠르게 증가하는 화석연료이다. 전통 천연가스는 비교적 쉽게 개발되는 반면, 비전통 가스는 개발이 보다 더 어렵고 높은 생산비를 필요로 한다. 비전통 가스는 심부가스, 셰일 가스, 석탄층 메탄가스(CBM), 지중 압력대, 가스 하이드레이트 및 치밀 가스 등 6개의 주요 형태로 구성된다. 치밀 가스는 매우 치밀한 지층을 이루는 불투수성의 견고한 암석 중에 부존하는 천연가스로, 사암 혹은 석회암층에 포집된 천연가스이다. 이 연구에서는 치밀 가스 관련 375개 논문을 연도별 발표현황(2000-2014), 국가별 및 연구기관별 논문 수, 국제공동연구 등을 분석하여, 국내 관련 산업 및 기술정책 수립과 연구개발에 유용한 학술자료로 활용될 수 있도록 하였다.

용융탄산염연료전지와 터보팽창기를 이용한 천연가스 정압기지의 열역학적 분석 (Thermodynamic Analysis on Hybrid Molten Carbonate Fuel Cell - Turbo Expander System for Natural Gas Pressure Regulation)

  • 성태홍;김경천
    • 한국가스학회지
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    • 제18권2호
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    • pp.28-34
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    • 2014
  • 일반적인 천연가스 정압기지에서는 압력제어밸브를 이용하여 고압으로 수송되는 천연가스를 감압하여 내보낸다. 이 과정에서 버려지는 폐압에너지는 터보팽창기를 도입하여 추가적인 전력생산이 가능하나 터보팽창기를 통과하는 유체에서는 감압에 의한 Joule Thompson 효과에 의하여 온도가 급격히 떨어져 파이프라인 외부에 동결을 일으키거나 파이프라인 내부에 메탄하이드레이트와 같은 고체 물질이 형성될 위험이 있다. 현재 터보팽창기를 채용한 천연가스 정압기지에서는 냉열발생에 따른 부작용을 방지하기 위하여 터보팽창기의 전단에 보일러를 설치하여 팽창 전 천연가스를 예열하고 있다. 용융탄산염연료전지와 같은 고온 연료전지는 천연가스를 연료로 사용할 수 있고 친환경적인 고온 배출가스를 방출하며 동시에 추가적인 전력을 생산하여 시스템의 효율을 높일 수 있다. 이 논문에서는 천연가스 정압기지에 용융탄산염연료전지와 터보팽창기를 설치하여 얻을 수 있는 열역학적 이득에 대해서 연구하였다. 연료전지를 기저부하로 사용함에 따라서 얻을 수 있는 이익에 대하여 분석하였다.

산업용 배기가스를 이용한 가스 하이드레이트로부터의 천연가스 생산 연구 (Study of Producing Natural Gas From Gas Hydrate With Industrial Flue Gas)

  • 서유택;강성필;이재구
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 추계학술대회 논문집
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    • pp.188-191
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    • 2008
  • There have been many methods for producing natural gas from gas hydrate reservoirs in permafrost and sea floor sediments. It is well knownthat the depressurization should be a best option for Class 1 gas hydrate deposit, which is composed of tow layers: hydrate bearing layer and an underlying free gas. However many of gas hydrate reservoirs in sea floor sediments are classified as Class 2 that is composed of gas hydrate layer and mobile water, and Class 3 that is a single gas hydrate layer. The most appropriate production methods among the present methods such as thermal stimulation, inhibitor injection, and controlled oxidation are still under development with considering the gas hydrate reservoir characteristics. In East Sea of Korea, it is presumed that the thick fractured shale deposits could be Class 2 or 3, which is similar to the gas hydrate discovered offshore India. Therefore it is needed to evaluate the possible production methods for economic production of natural gas from gas hydrate reservoir. Here we would like to present the production of natural gas from gas hydrate deposit in East Sea with industrial flue gases from steel company, refineries, and other sources. The existing industrial complex in Gyeongbuk province is not far from gas hydrate reservoir of East Sea, thus the carbon dioxide in flue gas could be used to replace methane in gas hydrate. This approach is attractive due to the suggestion of natural gas productionby use of industrial flue gas, which contribute to the reduction of carbon dioxide emission in industrial complex. As a feasibility study, we did the NMR experiments to study the replacement reaction of carbon dioxide with methane in gas hydrate cages. The in-situ NMR measurement suggeststhat 42% of methane in hydrate cages have been replaced by carbon dioxide and nitrogen in preliminary test. Further studies are presented to evaluate the replacement ratio of methane hydrate at corresponding flue gas concentration.

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TBAB를 포함하는 혼합 하이드레이트의 상평형 및 $^{13}C$ NMR 분석 (Phase Equilibria and $^{13}C$ NMR Analysis of the Double Semi-Clathrates Containing TBAB)

  • 이승민;박성민;이영준;이성원;서용원
    • Korean Chemical Engineering Research
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    • 제49권3호
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    • pp.367-371
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    • 2011
  • TBAB(tetra-n-butyl ammonium bromide)는 상온/상압 조건에서 semi- clathrate를 형성하는 물질로서 최근 가스 하이드레이트 형성법을 이용한 천연가스 수송 및 저장, 기체분리 공정 등에서 열역학적 촉진제로 주목받고 있다. 본 연구에서는 TBAB의 열역학적 촉진제로서의 특성을 알아보기 위해 $CH_{4}$+TBAB와 $CO_{2}$+TBAB 혼합 하이드레이트계에 대하여 TBAB 농도(5, 32 wt%)에 따른 가스 하이드레이트 3상(하이드레이트(H)-물($L_{w}$)-기상(V)) 평형 조건을 측정하였다. 혼합 하이드레이트의 경우 TBAB의 농도가 5 wt%일 때에 비해 32 wt%일 경우에 열역학적 촉진 효과가 훨씬 크게 나타나는 것을 알 수 있었으며, 이는 순수 TBAB semi-clathrate의 농도별 상압 해리 온도 경향과 유사하였다. 또한, $^{13}C$ NMR 분석을 통하여 $CH_{4}$ + TBAB 혼합 하이드레이트의 동공에 $CH_{4}$ 기체가 포집되어 있음을 확인하였고 이 동공의 특성이 순수 $CH_{4}$ 하이드레이트(구조-I)의 작은 동공($5^{12})$과 동일함을 확인할 수 있었다.

천연가스 수송을 위한 Gas Hydrate Supply Chain의 경제성 분석 (Gas Hydrate Supply Chain analyses of economy for the natural gas transportation)

  • 김철호;이재익;정태석
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 추계학술대회 초록집
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    • pp.151.1-151.1
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    • 2010
  • Natural gas hydrates (NGH) provide 170 gas volumes per unit volume of the medium and are easier to make with moderate pressure and temperature (40 bar at 3 C). Once they form, their preservation temperature is 20 C at 1 bar, which is much milder than the LNG preservation. In case of using the NGH, The small and medium sized gas well has advantages for development because of NGH's these characteristics. According to the cost evaluation report of Gudmundsson in Norway and the research of MES in Japan, the gas well that uses the NGH has a cost saving effect about 10~20% compared LNG. The effect depends on distance and production. However, cost saving and efficiency of liquefaction process is increased by the development of LNG liquefaction technology. Therefore, these factors have to be reflected in economic analysis. The purpose of this research is to compare the cost of Gas Supply Chain according to the transport type, distance and gas reserves. Especially, we consider not only the cost of facility but also the total cost (production cost, transport cost, etc).

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천연가스 고체수송 및 저장을 위한 가스 하이드레이트 상평형 조건에 대한 연구 (Phase Equilibrium Conditions of Gas Hydrates for Natural Gas Solid Transportation and Storage)

  • 전용한;김종윤;김종보;김남진
    • 설비공학논문집
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    • 제20권4호
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    • pp.266-273
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    • 2008
  • Natural gas hydrates are ice-like solid substances, which are composed of water and natural gas, mainly methane. They have three kinds of crystal structures of five polyhedra formed by hydrogen-bonded water molecules, and are stable at high pressures and low temperatures. They contain large amounts of organic carbon and widely occur in deep oceans and permafrost regions. Therefore, they are expected as a potential energy resource in the future. Especially, $1m^3$ natural gas hydrate contains up to $172Nm^3$ of methane gas, de pending on the pressure and temperature of production. Such large volumes make natural gas hydrates can be used to store and transport natural gas. In this study, three-phase equilibrium conditions for forming natural gas hydrate were numerically obtained in pure water and single electrolyte solution containing 3 wt% NaCl. The results show that the predictions match the previous experimental values very well, and it was found that NaCl acts as an inhibitor. Also, help gases such that ethane, propane, i-butane, and n-butane reduce the hydrate formation pressure at the same temperature.

가스하이드레이트 제조성능 향상을 위한 영향인자 검토 연구 (An experimental study on the factors to improve the formation performance of gas hydrate)

  • 신창훈;김유나;권옥배;박승수;한정민;이정환
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.2989-2994
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    • 2007
  • Gas hydrates are ice-like crystalline compounds that form under low temperature and elevated pressure conditions. Although hydrate formation can pose serious flow-assurance problems in the gas pipelines or facilities, gas hydrates present a novel means for natural gas storage and transportation with potential applications in a wide variety of areas. An important property of hydrates that makes them attractive for use in gas storage and transportation is their very high gas-to-solid ratio. In addition to the high gas content, gas hydrates are remarkably stable. The main barrier to development of gas hydrate technology is the lack of an effective method to mass produce gas hydrate in solid form. The first objective of this study is investigating the characteristics of gas hydrate formation related to several factors such as pressure, temperature, water-to-storage volume ratio, concentration of SDS, heat transfer and whether stirred or not respectively. And the second objective is clarifying the relation between the formation efficiency and each factor in order to find the proper way or direction to improve the formation performance.

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