대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제35권11호
  • /
  • Pages.1177-1184
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  • 2011
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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열수 주입법에 의한 메탄가스 하이드레이트 펠릿의 해리 특성에 관한 실험 연구

Experimental Study on the Dissociation Characteristics of Methane Hydrate Pellet by Hot Water Injection

  • 이승한 (동국대학교 기계로봇에너지공학과) ;
  • 윤용석 (동국대학교 기계로봇에너지공학과) ;
  • 성관제 (동국대학교 기계로봇에너지공학과)
  • Lee, Seung-Han (Dept. of Mechanical, Robotics and Energy Engineering, Dongguk Univ.) ;
  • Yoon, Yong-Seok (Dept. of Mechanical, Robotics and Energy Engineering, Dongguk Univ.) ;
  • Seong, Kwan-Jae (Dept. of Mechanical, Robotics and Energy Engineering, Dongguk Univ.)
  • 투고 : 2011.07.13
  • 심사 : 2011.08.19
  • 발행 : 2011.11.01
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초록

GTS 기술은 천연가스 하이드레이트 생산, 해양수송 및 재기화의 3 단계로 구성되며, 대규모 재기화 플랜트의 효율적 운용을 위해서는 하이드레이트 펠릿의 재기화에 필요한 열수 온도와 유량의 정확한 예측이 필수적이다. 하이드레이트 펠릿이 열수에서 해리할 때 펠릿 표면에서 분출되는 가스는 주변 유동장과 열전달 특성에 영향을 미칠 것이며 본 실험에서는 가압된 용기내의 중저온 열수에서 해리하는 메탄가스 하이드레이트 펠릿의 용해특성을 연구하였다. 해리과정 중 변화하는 펠릿 형상을 관찰하고 해리 완료시간을 측정함으로써 하이드레이트 전환율, 열수 온도 및 유동속도가 해리에 미치는 영향을 파악하였으며, 펠릿 표면에서 분출되어 상승하는 메탄가스 기포류가 유발한 2 차유동이 열전달률을 증가시켜 해리 완료시간이 단축됨을 확인하였다.

Gas-to-Solid (GTS) technology is composed of three stages: hydrate production, transportation, and regasification. For efficient operation of regasification plants, it is crucial to predict the temperature and flow rate of hot water necessary to dissociate the hydrate pellets. Dissociated gas escaping from the pellet surface, when in contact with hot water, will alter the flow field and consequently alter the heat transfer rate. Methane hydrate pellet dissociation characteristics in low- to moderatetemperature water were investigated by taking images of the changes in the hydrate pellets' shapes in a pressurized reactor and measuring the total time required for complete melting of the pellets. The effects of water temperature, hydrate conversion rate, and flow speed on the dissociation completion time were also investigated. Bubbling gas released from the pellet surface induced a secondary flow that enhanced the heat transfer rate and thus decreased the dissociation time. It was also found that a considerable flow rate was needed to significantly decrease the dissociation time.

키워드

참고문헌

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피인용 문헌

  1. Compressive Strength Properties of Natural Gas Hydrate Pellet by Continuous Extrusion from a Twin-Roll System vol.2013, pp.1687-8442, 2013, https://doi.org/10.1155/2013/207867