한국해양대학교

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캐비티 流體 流動의 應用에 의한 船舶 廢油 處理에 관한 연구

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dc.contributor.author 韓元熙 -
dc.date.accessioned 2017-02-22T07:08:43Z -
dc.date.available 2017-02-22T07:08:43Z -
dc.date.issued 2002 -
dc.date.submitted 56797-10-27 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174036 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/10334 -
dc.description.abstract The rapid growth of world's population and the distinctive development of industrial technologies have recently accelerated marine pollutions. This led to stringent regulations on the marine pollutions. Among the marine pollutions, especially oil-caused pollution has become a severe issue with direct damage such as the demolition of marine ecosystem. Petroleum hydrocarbon, however, is widely applied in large volume, which increases continuously. Waste oils are one of the sources of marine oil pollution generated from ships. It was currently difficult to treat them the whole quantity within a ship so that they are transferred to a shore treating facility after being collected inside the ship's sludge tank mostly. However, shore transferring method causes cost generation in the economic standpoint, consumes much time, and entails the risk of oil pollution. Accordingly, a fundamental measure in the light of prevention of marine oil pollution would be self treatment in respective ships. Ultrasonic vibrator is an equipment which atomizes and homogenization the oils by breaking the oil particles with ultrasonic vibration cavity, and would improve the properties. But it has not been yet applied to treat waste oil. This study intended to investigate a method, as a fundamental preventive measure against oil pollution from ships, to self treat sludge and waste oils unavoidably generated in operating ships. For this, the matrix structures of fuel oil, lubricating oil and sludge oil, which are marine oils, were investigated. These oil solutions from various environments were irradiated with ultrasonic vibration and then observed the aspects of the change of oil particles. From these, the recycling feasibility of sludge oil for usable oil to be burnt was determined. And, in order to analyze erosion aspect on transducer horn tip, which is a principle part of ultrasonic vibrator, the erosion damage was investigated on weight loss and weight loss rate mainly using SS41, as horn tip material. Also, the erosion damage of metallic material and the homogenization of oil caused by cavitation in the sludge oil environment were identified by investigating the aspect of the erosion of SS41 specimen caused by the impact pressure generated from the demolition of the cavity of ultrasonic vibrator horn. The important findings from this study are as follows. 1) Waste oils go through homogenization of oil particle by cavitation from ultrasonic vibration, and the effects are good according to the oil temperature increased and the experimental time takes long. 2) Viscosity, pH value, and specific gravity of marine oil decrease by repetition of cavity flow fluctuation. The decrement is larger in the oil with fuel oil property than in the oil with lubricant oil property. 3) The ratio of erosion damage at amplitude 50㎛ was larger over 2 times than that of 24㎛, and the value of rate was larger in fuel oil sludge than in lub. oil sludge. 4) The erosion damage to the increase of oil temperature was decreased in lub. oil sludge but increased in fuel oil sludge to the contrary. Therefore, the demolition pressure of cavity is lower to the increase of oil temperature in lub. oil sludge environment. 5) It was the largest effect of cavity at immersion depth 3mm of transducer horn at oil temperature 30℃ in sludge oil environment. But in case of oil temperature 50℃, 70℃ and 90℃, the effect of cavity was the largest at immersion depth 6mm. 6) As the space of between transducer horn and specimen decreased, the erosion damage and the effect of demolition pressure of cavity were increased. 7) The effect of cavity fluid fluctuation on the homogenization of sludge oil and erosion of SS41 acted larger in the oil environment with fuel oil property than the lubricant oil property. As these experimental results, it was found that the possibility on the development of ultrasonic breaking systems to recycle waste oils from ships. Also, the optimum conditions were ascertained to obtain the best efficiency according to the environment of oil properties. In addition, it would help investigate the aspect of cavitation erosion damages in varieties of equipment, metallic materials of different operating environment and material characteristics, and also would help establish the countermeasures of cavitation erosion damages. -
dc.description.tableofcontents 목차 List of Figures = v List of Photographs = xiii List of Tables = xiv Abstract = 1 제1장 서론 = 5 1.1 연구의 배경 및 목적 = 5 1.2 연구의 동향 = 9 1.3 논문의 구성 및 연구방법 = 11 제2장 기본 이론 = 13 2.1 선박 폐유 = 13 2.1.1 선박유류 및 슬러지 = 13 2.1.2 슬러지 발생 = 14 2.2 초음파 = 18 2.2.1 초음파와 응용 = 18 2.2.2 초음파 발생장치 = 19 2.2.3 초음파 강도 = 21 2.3 캐비테이션 = 23 2.3.1 캐비테이션의 정의 = 23 2.3.2 캐비티의 발생 = 24 2.3.3 캐비테이션 거동 = 25 2.3.4 초음파 캐비테이션 = 29 제3장 캐비티 유체 유동에 의한 유류의 균질 효과 및 성상변화 = 32 3.1 서언 = 32 3.2 실험방법 = 34 3.2.1 시료유의 특성 = 34 3.2.2 실험방법 = 35 3.2.3 실험장치 = 36 3.3 결과 및 고찰 = 42 3.3.1 캐비티 유체 유동에 의한 선박유류의 균질 효과 = 42 3.3.2 폐유의 균질 작용에 미치는 유속의 영향 = 52 3.3.3 폐유의 유온 변화에 따른 균질 효과 = 55 3.3.4 폐유 균질 효과에 미치는 진동자 혼의 침지깊이 = 58 3.3.5 캐비티 유체 유동에 의한 선박유류의 성상변화 = 61 3.4 결언 = 65 제4장 = 슬러지유 환경에서 캐비티 유체 유동에 의한 초음파 진동자 혼 선단의 침식 특성 = 67 4.1 서언 = 67 4.2 실험에 응용된 이론 = 69 4.3 실험방법 = 70 4.3.1 시료유 및 시험편의 특성 = 70 4.3.2 실험방법 = 72 4.3.3 실험장치 = 73 4.4 결과 및 고찰 = 75 4.4.1 진동자의 혼 디스크의 캐비테이션 침식에 미치는 유온의 영향 = 75 4.4.2 유온 변화 환경에서 진폭에 따른 무게감소량의 비교 = 80 4.4.3 진폭 24㎛에 대한 50㎛에서의 유온에 따른 무게감소율의 비 = 83 4.4.4 유온 변화에 따른 최고침식율 및 발생시간에 대한 특성 = 86 4.4.5 유온 변화 환경에서 진동자 혼의 침지깊이에 따른 침식양상 = 89 4.4.6 진폭 50㎛인 경우의 최고침식율 및 이에 이르는 시간 비교 = 123 4.5 결언 = 128 제5장 슬러지유 환경 중 일반강의 침식에 미치는 캐비티 유체 유동의 영향 = 130 5.1 서언 = 130 5.2 실험방법 = 132 5.2.1 시료유 및 시험편의 특성 = 132 5.2.2 실험방법 및 장치 = 133 5.3 결과 및 고찰 = 136 5.3.1 유온 변화 환경에서 진동자 혼과의 간격에 따른 시험편의 침식특성 = 136 5.3.2 유온 변화 및 진동자 혼과의 간격에 따른 최고침식율 비교 = 169 5.3.3 진동자 진폭 50㎛와 24㎛에 따른 최고침식율 비교 = 174 5.4 결언 = 175 제6장 결론 = 177 참고문헌 = 180 Appendix = 191 Appendix A = 191 Appendix B = 193 Appendix C = 208 -
dc.publisher 한국해양대학교 -
dc.title 캐비티 流體 流動의 應用에 의한 船舶 廢油 處理에 관한 연구 -
dc.title.alternative A Study on the Treatment of Shipborne Waste Oils by Cavity FluidFluctuation -
dc.type Thesis -
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기관공학과 > Thesis
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