• 한국태양에너지학회 논문집
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• 제26권2호
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• pp.19-25
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• 2006

Methane hydrate, non-polluting new energy resource, satisfies requirement and considered as a precious resource that can prevent the global warming. Fortunately, there are abundant resources of methane hydrate distribute in the earth widely. Therefore, developing the techniques that can utilize these gases effectively is highly desired. The work in this paper here is to develop a skill which can transport and store methane hydrate. As a first step, the equilibrium experiment was 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 clarify kinetic characteristics of the hydrate. The results of present investigation showed that the enhancements of the hydrate formation in terms of the gas/water ratio are closely related to operational pressure, temperature, degrees of subcooling, and water injection.

• 신재생에너지
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• 제4권2호
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• pp.61-67
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• 2008

The price to import natural gas continues to rise, as well as the rate of its domestic consumption. This research examined the economic feasibility of domestically developing and producing gas hydrate to substitute imported natural gas. Today, the industry still lacks the technology to commercially produce gas hydrate. However, if the gas hydrate is able to be commercially produced domestically and replace imported natural gas, the annual economic benefit for the Republic of Korea would be 211 - 833 USD/ton. Gas hydrate is rated as a high value investment by the gas industry since the potential annual profit can reach over 150USD/ton. The commercial value of gas hydrate development will increase as long as the natural gas market continues to expand and its consumption increase remains steady. With further development of technology, one can anticipate an even higher expected return on the investment.

• 한국세라믹학회지
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• 제53권1호
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• pp.63-67
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• 2016

Mineral hydrate is a new insulation material that compensates for the defects of existing materials. Mineral hydrate is made of inorganic ingredients; therefore, it is nonflammable. The porous structure of mineral hydrate makes the material lightweight and insulating. Mineral hydrate insulation and similar products have been studied and manufactured in Korea and abroad. However, these insulation materials need to improve in terms of strength. In this study, basalt fiber was used to enhance the strength. In order to observe the property changes, compressive strength, heat conductivity, and specific gravity were measured and XRD pattern analysis was performed. These tests confirmed that basalt fiber was effective at improving the strength and lowering the heat conductivity of mineral hydrate insulation.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.705-708
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• 2009

For the Gas hydrate Research and Development in Korea, the prospect area I & II was surveyed and drilled during the first phase. At the result, we succeeded to discovering gas hydrate real sample at BSR reflection and vent structure. This expedition processing contributes to developing the offshore seismic survey technologies and data processing of Korea. But Korean gas hydrate test production research, in spite of activating test production at other countries, is such a limitation about technician, GH production technologies and E&P processing. First of all, there is no exist in Korea to application site for the their production research results. In this paper, we have studied the gas hydrate reservoir selection technics of the DOE & BPXA for the ANS test production. And this result will helpful to preparation of gas hydrate test production in Korea.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.489-492
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• 2007

The P-wave velocity at the formation which contains gas hydrate varies very wide upon gas hydrate existence. These features on seismic shot gather can not be simulated normally by numerical modeling of homogeneous medium so that we need that of random inhomogeneous medium instead. We, in this study generated random inhomogeneous medium using gaussian ACF, exponential ACF and von Karman ACF and that we supposed the random inhomogeneous medium be gas hydrate formation to execute numeric modeling. The modeling result shows the typical effect by scattering caused by random hydrate formation as is observed from seismic shot gather where hydrate exist.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.399-404
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• 2008

The influence of gas hydrate dissociation on submarine slope stability was studied in this paper. Gas hydrates are stable under high pressure and low temperature conditions. Once gas hydrate dissociates due to natural or human activities, it generates large amount of gas and water. During gas hydrate dissociation, a pore pressure between soil particles increases and results in the loss of an effective stress and degradation of soil stiffness. A pore pressures model was proposed to calculated excess pore pressures generated by gas hydrate dissociation at the Storegga Slide. A slope stability analysis for the Storegga Slide using a two dimensional finite difference method was carried out by considering excess pore pressures due to gas hydrate dissociation. Since the excess pore pressure calculated by the proposed method resulted in the considerable loss of stiffness and strength in slope, a submarine slope failure occurred at the Storegga slide was well simulated.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.594-596
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• 2007

Using an oedometer cell instrumented to measure the evolution of electromagnetic properties, small strain stiffness, and temperature, we conducted consolidation tests on four types of sediments. The tested specimens include sediments with different gas hydrate saturation at four stages of loading. The test results show that the electromagnetic and mechanical properties of hydrate-bearing marine sediments are governed by the vertical effective stress, stress history, porosity, hydrate saturation, fabric, ionic concentration of the pore fluid, and temperature. The results also show that permittivity and electrical conductivity data can be combined to estimate hydrate volume fraction in laboratory sediments, methodology that might eventually be extended for estimation of hydrate concentrations in field settings.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.140-147
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• 2018

The performance of a hydrate anti-agglomerant (AA) on cyclopentane (CyC5) hydrate anti-agglomeration at various concentrations (0-1 wt%, based on the oil phase) using MMF apparatus has been investigated. At low AA concentrations up to 0.01 wt%, the AA reduces the cohesion force (capillary force) by reducing the CyC5-water interfacial tension. At concentrations higher than 0.1 wt%, hydrate hydrophobicity alternation and AA's thermodynamic inhibition effects are the main part of AA's mechanism. Additionally, a "temporary agglomeration" phenomenon caused by surface melting of the hydrate particles is also observed, which may indicate the AA's weak ability to produce stable water-CyC5 interface.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.615-617
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• 2005

[ $^{13}C$ ] NMR spectra were obtained for pure $CH_4$ hydrate in order to identify hydrate structure and cage occupancy of guest molecule. The NMR technique can provide both qualitative and quantitative hydrate characteristics. The moles of methane captured into pure $CH_4$ hydrate per mole of water were found to be similar to the full occupancy value. The overall results drawn from this study can be usefully applied to storage and transportation of natural gas.

• 대한환경공학회지
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• 제30권2호
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• pp.218-224
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• 2008

본 연구에서는 석탄계, 야자계, 목탄계 활성탄과 흡착능이 없는 안트라사이트를 이용하여 클로랄하이드레이트에 대한 흡착 및 생물분해 특성을 평가하였다. 활성탄 공정에서 클로랄하이드레이트의 제거기작은 운전초기에는 흡착이 높은 비중을 차지하나 부착미생물의 활성이 증진되면서 부착미생물에 의한 생분해와 흡착에 의해 제거되었으며, 클로랄하이드레이트는 생분해능이 큰 물질들로 조사되었다. 입상활성탄 재질별 클로랄하이드레이트의 제거 특성은 석탄계와 야자계 활성탄에서 제거율이 높았고, 목탄계는 상대적으로 낮은 제거능을 보였으며, 안트라사이트 biofilter에서 가장 낮은 제거능을 보였다. 활성탄 재질별 부착 미생물의 생체량과 활성도는 석탄계가 가장 높았고, 야자계, 목탄계, 안트라사이트 순으로 나타났으며, 수온 변화에 따른 클로랄하이드레이트의 제거 특성은 수온이 10$^{\circ}C$ 이하로 저하될 경우 부착 bacteria의 생체량과 활성도 감소로 제거율이 감소하였다. 안트라사이트를 이용한 생물여과 공정은 수온의 변화에 아주 민감하게 변하는 양상을 나타내었으며, 이는 부착 bacteria에 의한 직접적인 생물분해가 주 제거 메카니즘이기 때문인 것으로 나타났다. 클로랄하이드레이트의 제거시 유입농도가 높은 경우에는 수온의 영향이 매우 중요하며, 흡착능이 소진된 활성탄이나 흡착능이 없는 여재를 사용한 생물여과 공정에서는 수온이 낮은 동절기에는 클로랄하이드레이트의 유출 가능성이 있었다.