• 한국해양환경ㆍ에너지학회지
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• 제2권1호
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• pp.34-39
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• 1999

Removal of spilled oil over the sea and the river has become one of the urgent problems in these days. Removing oil using mechanical devices by adhesion method is known to be closely related with the problem of estimating the thickness of film remaining on the surface of solid withdrawn from a quiescent liquid. In the present study a series of experimental results are compared with the analytic estimation for the thickness of film remaining on the solid surface using non-dimensional analysis. For the case of pure water both results show the remarkable agreement. However, discrepancy has been found for the case of Bunker C oil and diesel oil. The analytic estimation over-predicts the experimental value for the case of Bunker C oil and under-predicts it for the case of diesel oil. Further study is required to investigate the real situation including a contact angle and the property difference between oil and water.

• 대한기계학회논문집B
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• 제22권12호
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• pp.1702-1714
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• 1998

Removal of spilled oil over the sea and the river has become one of the urgent problems in these days. Removing oil using mechanical devices was recommended because chemical dispersion could cause the secondary contamination in the environment. In the present study a series of experiments were carried out to study the effect of operating conditions, especially, the angle between the belt and the fluid surface on the rate of recovery for the spilled oil using a belt skimmer. Three different types of operation, namely, upward pickup, downward pickup and up-and-downward pickup situations have been investigated for various contact angles, belt speeds and oil thicknesses to find the effects on the recovery rate. The highest rate of oil recovery was found in the case of a contact angle of $45^{\circ}$ and downward pickup. Furthermore, an optimal belt speed was found to reach the saturated recovery rate for a given oil thickness.

• 한국해양공학회지
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• 제11권3호
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• pp.132-143
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• 1997

Removal of spilled oil over the sea and the river has become one of the urgent problem in these days. Removing oil using mechanical devices are recommended because chemical dispersion can cause the secondary contamination in the environment. In the present study a series of experiments were carried out to study the effect of working conditions of a belt type skimmer on the rate of recovery for the spilled oil. The oil chosen for the present experiment was diesel oil. Three different situations, namely, upward, downward, up-and-downward pickup have been investigated for various contact angles, belt speeds and oil thicknesses. The results show that the rate of oil recovery for the case of downward pickup with a contact angle of 45.deg. shows the highest among all the conditions. For the removal of spilled diesel oil the optimal belt speed can be found as the critical value to reach the saturated pickup rate for a given oil thickness. The recovery rate of bunker C oil shows 4-6 times higher than that for diesel oil. And the optimal belt speed for bunker C oil can be found less than that for diesel oil for the same slick thickness.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.225-225
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• 2017

• 대한기계학회논문집B
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• 제21권5호
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• pp.679-690
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• 1997

Oil spill over the sea and the river become a serious problem in these days. Two different approaches are used to clean up the spilled oil by means of chemical dispersion and mechanical devices. If it is possible, removing spilled oil using mechanical devices are highly desirable in order not to worry about the secondary contamination from chemical treatment. One of the major unsolved problems using mechanical devices has been the recovery of highly viscous oil spill. So, the systematic experimental data for treating very viscous oil are still wanting. In the present study a series of experiments were carried out to study the effect of the rotational direction of the belt skimmer on the rate of oil recovery using Bunker C oil. Three different situations, namely, upward, downward and up-and-downward pickup rate have been investigated for variable belt speed. The results showed that the rate of oil recovery for downward pickup was much higher than that for upward pickup. The major mechanism to recover the oil using a belt skimmer has been confirmed that oil sticks to the belt surface while moving to the water rather than moving upward. For the removal of spilled oil the optimal belt speed under the present experimental conditions was found to be about 200 ~ 270 mm/s just before the starvation started. The present experimental results would provide the basis for understanding the performance characteristics and physics of various types of skimmers.

• 해양환경안전학회지
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• 제23권2호
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• pp.208-215
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• 2017

원유나 벙커C유와 같은 지속성 기름이 해상에 유출되면 풍화과정을 거쳐 점도가 높아지고, 부유 쓰레기와 섞이게 되면 이를 수거할 수 있는 장비는 매우 제한적이다. 본 연구에서는 기존 유회수기의 외부에 위치한 부속장치들을 본체 내부로 배치하고, 컨베이어 벨트와 강제유입장치인 스위퍼 및 부력체를 탑재한 수집조로 구성하여 자항과 리모트컨트롤이 가능한 무인 컨베이어 벨트식 부유쓰레기 및 고점도유 회수장비를 개발하였다. 실해역 테스트에서 30 m의 거리를 1.2 knots의 속도로 자항하며, 전 후, 좌 우에서 안정적인 균형유지와 구동부의 정상작동을 확인하였다. 임시저장조를 이용한 유회수 성능테스트 결과, 최소 $7.8k{\ell}/h$에서 최대 $23.3k{\ell}/h$까지 유출유 회수가 가능하였다. 또한, 페트병 등 부유쓰레기와 유출된 기름이 혼합된 조파수조에서 실시한 회수량 측정 테스트 결과는 $7.7k{\ell}/h$로 나타났다. 본 연구를 통해 개발된 장비가 해상기름오염사고 시 현장에 신속하게 투입된다면 방제능력 향상에 기여할 수 있을 것으로 기대하며, 현재 운용중인 Portable 유회수기의 성능개선 연구에 활용될 수 있을 것으로 판단된다.