지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1990.11
- 수록면
- 41 - 46 (6page)
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초록· 키워드
오류제보하기
The consumption of Natural Gas as an energy source continues to grow in Korea due to it's abundant resource and clean burning as a fuel. However the sources of natural gas do not coincide geographically with areas of high demand. Thus the gas must either be transported via a pipeline network, or be liquified and shipped by tank-trucks of in special tankers. In Korea, All gas is carried in liquified state by ship. Therefore it becomes necessary to proceed liquified natural gas through an evaporator to produce natural gas at the LNG plant. In order to handle this load the conventional evaporator which is an indirect contact heat exchanger, has its limitation due to the scaling and corrosion problems in the pipe with it's low thermal efficiencies.
In the present investigation, it has been proposed to use a direct contact heat exchanger as an evaporator to solve the difficulties associated with the conventional one. Liquified nitrozen was utilized as a working fluid to investigate basic nature of bubble dynamics in the evaporator, and a spray nozzle was adopted to inject liquified nitrozen into the spray column with varying dispersed phase flow rates.
Observing the bubble dynamics in the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. When working fluid with very low temperature comes into contact with relatively moderate temperature-water as a continuous phase, main and serious concerns were the possibility of eruption phenomena between two fluids and icing problem on the vicinity of the injection spray nozzle.
The results show that the eruption phenomena was not observed in the present investigation with LN₂ and the interface between the N₂ bubble and water was fully turbulent. It is believed that it is due to the high injection velocity of LN₂ through the spray nozzle into the water and the mixing effect results in turbulent heat and mass transfers between water and bubble. It is also found that ice was formed on the surface of the spray nozzle for higher LN₂ flow rates. However, even in this case, the ice was detached as soon as it was formed, because higher LN₂ flow rates promote the present experimental conditions, the shapes of the bubble were in the spherical-cap region according to the Clift, Grace and Weber Graph, and the height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximun possible height.
In the present investigation, it has been proposed to use a direct contact heat exchanger as an evaporator to solve the difficulties associated with the conventional one. Liquified nitrozen was utilized as a working fluid to investigate basic nature of bubble dynamics in the evaporator, and a spray nozzle was adopted to inject liquified nitrozen into the spray column with varying dispersed phase flow rates.
Observing the bubble dynamics in the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. When working fluid with very low temperature comes into contact with relatively moderate temperature-water as a continuous phase, main and serious concerns were the possibility of eruption phenomena between two fluids and icing problem on the vicinity of the injection spray nozzle.
The results show that the eruption phenomena was not observed in the present investigation with LN₂ and the interface between the N₂ bubble and water was fully turbulent. It is believed that it is due to the high injection velocity of LN₂ through the spray nozzle into the water and the mixing effect results in turbulent heat and mass transfers between water and bubble. It is also found that ice was formed on the surface of the spray nozzle for higher LN₂ flow rates. However, even in this case, the ice was detached as soon as it was formed, because higher LN₂ flow rates promote the present experimental conditions, the shapes of the bubble were in the spherical-cap region according to the Clift, Grace and Weber Graph, and the height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximun possible height.
목차
ABSTRACT
1. 서론
2. Eruption현상
3. 실험장치 및 실험 방법
4. 실험결과 및 고찰
5. 결론
6. Reference
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