• Journal of the Korean Society of Marine Environment & Safety
• /
• v.26 no.7
• /
• pp.864-872
• /
• 2020

In accordance with the sulfur regulations of the International Maritime Organization (IMO), very low sulfur fuel oil (VLSFO) shows various production-dependent physico-chemical properties. This study aims to use as basic data for oil spill response according to study of physico-chemical characteristics of VLSFO and mixed fuel oil of VLSFO-HSFO. The mixed fuel oil was prepared by mixing 25, 50, 75 mass% of HSFO with VLSFO containing 0.46 and 0.36 mass% of sulfur. The physico-chemical properties such as the kinematic viscosity, pour point and distribution of Saturates, Aromatics, Resins, and Asphaltenes (SARA) were studied in the laboratory. As mixed of 75 mass% of HSFO with high the kinematic viscosity and low pour point in VLSFO, the kinematic viscosity of the mixed fuel oil increased to 350.2 %, and VLSFO with pour point of 23℃ and -11℃ lowered or raised to -3℃ and -6℃ respectively. As HSFO was mixed in VLSFO with a small Asphaltenes distribution, the Saturates distribution decreased to 68.8% and Asphaltenes distribution increased to 1,417 % dramatically.

• Journal of the korean Society of Automotive Engineers
• /
• v.18 no.2
• /
• pp.72-92
• /
• 1996

식물유, 어유 및 축산 폐기물을 포함한 동식물성 기름은 어느 연료든지 기관의 연료로서 사용 가능하지만, 이들 연료는 점도가 높고, 저휘발성이어서 착화지연기간동안에 가연성혼합기 생성이 어려워 저 NOx이며, 정숙한 운전이 사능할 뿐 아니라 경유정도의 열소비율 및 배기 매연농도로 디젤기관의 대체 연료로서의 충분한 가능성이 있는 연료임을 확인하였다. 그러나, 고점도에 의한 분무 특성의 악화에 기인한 분무입자의 증대로 미연소분에 의한 carbon deposit 및 piston ring stick 등이 문제점으로 지적되었다. 그러나, 이같은 문제점의 해결책으로 경질유와의 혼합, 에스테르 변환 및 연료의 가열등 여러 해결책을 제시하였고, 배기가스분석결과도 양호함을 확인하였다. 이같은 biomass 연료 일종인 식물유가 아무런 변화없이 이용되기 위해서는 고과급화, 단열 및 연소실의 적절한 설계가 필요할 것으로 생각된다. 따라서, 현재의 실황을 생각한다면 기존기관을 특별하게 개조함이 없이 사용을 전제로 할 때 식물유의 이용은 local 에너지로서, 생산, 전환 또는 이용기술의 개발과 동시에 화석에너지의 보충적인 에너지로 고려하는 것이 유효할 것으로 생각된다.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.20 no.2
• /
• pp.127-132
• /
• 1984

Performance tests of small diesel engine were carried out, using the blend fuel oil as the substitute fuel oil and the following results were obtained. (1) The character at the blend oil as substitute fuel for small diesel engine was examined. (2) In the case of operating small diesel engine with blend oil, the exhaust gas volume increases at 8% in comparison with diesel oil. (3) In the case of operating small diesel engine with blend oil, the fuel consumption Increases at 3% in comparison with diesel oil. (4) In the brake thermal efficiency, blend oil is similar to diesel oil.

• Tribology and Lubricants
• /
• v.8 no.1
• /
• pp.17-23
• /
• 1992

발전기용 원동기에는 증기 Turbine engine과 디이젤 Engine으로 분류한다. 일반적으로 발전기 Bearing의 윤활유는 구동용(驅動用) 원동기와 동일한 윤활유를 사용하고 있다. 또한 디이젤 발전기는 연료가 A중유로서 비교적 양질의 연료유를 사용하고 있다고 하더라도 고부하로서 연속운전되고 있기 때문에, 윤활조건이 가혹하게 되어지고 있다. 따라서 항상 사용유의 상태를 파악할 필요가 있다.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.27 no.6
• /
• pp.890-897
• /
• 2021

Since the enforcement of strict regulations on marine fuel oil sulfur content, demand for Low Sulfur Fuel Oil (LSFO) has been increasing. However, as LSFO properties vary greatly depending on the supply timing, region, and supplier, LSFOs can experience problems with sludge formation, blending compatibility, and stability once mixed into storage tanks. This study investigates using ultrasound cavitation effects to improve the quality of LSFOs in storage tanks. For marine gas oil (MGO), the results showed that the relative ratio of high molecular weight compounds to those of low molecular weight decreased after ultrasonic irradiation, due to cavitation-induced cracking of chemical bonds. For marine diesel oil (MDO) and blended oil, a small increase in the relative abundance of low weight molecular compounds was observed after treatment. However, no correlation between time and relative abundance was observed.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.21 no.1
• /
• pp.103-108
• /
• 2015

Recent global warming has been recognized as the world economy development from fossil fuel use is the culprit. This study was reduce the fossil fuel has been developed in a number of alternative energy, As a fuel that can be produced in our country is a biofuel. Biofuels is a sustainable fuel having economically benefits and decreasing environmental pollution problems caused due to fossil fuel. A lot of research is progressing about the conversion of diesel biofuel as renewable clean energy. In this experiment were remodel the institution that has been used in fishing engine again produced an experimental apparatus were installed directly, were studied using various bio fuel like to help the economically and environmentally sound operation of the vessel. rapeseed oil, soybean oil, comprehensively analyzing the results the effects of the exhaust emission characteristics of the waste rapeseed oil is available in a marine engine with similar physical and chemical components of the fuel, and the fuel consumption ratio, NOx is slightly increased, but soot was confirmed a tendency to decrease much.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.14 no.1
• /
• pp.83-87
• /
• 2008

We have a lot of interest in alternative fuels to provide energy independence from oil producing country and to reduce exhaust emissions for air pollution prevention. Biodiesel, which can be generated from natural renewable sources such as new or used vegetable oils or animal fats, may be used as fuel without change of engine structure in diesel engine of compression ignition engine. In this paper, the test results on specific fuel consumption and exhaust emissions of neat diesel oil and biodiesel blends(10 vol.% biodiesel and 20 vol.% biodiesel) were presented using four stroke, direct injection diesel engine. Especially this biodisel was produced from rape oil at our laboratory by ourselves. This study showed that specific fuel consumption and NOx emission were slightly increased, on the other hand CO emission and Soot were tolerably decreased more in the case of biodiesel blends than neat diesel oil.

• Journal of Biosystems Engineering
• /
• v.9 no.2
• /
• pp.58-64
• /
• 1984

디이젤엔진의 대체연료(代替燃料)로서 대두유(大豆油)는 대두유(大豆油)의 높은 점성(粘性)에 기인(起因)하는 문제점이 지적되고 있다. 이외 해결방법으로 대두유(大豆油)와 디이젤유(油)의 혼합(混合), 대두유(大豆油)의 에스테르화(化) 그리고 디이젤유(油) 첨가제(添加劑)의 첨가(添加) 등이 제시되고 있다. 본(本) 연구(硏究)는, 대두유(大豆油), 그의 에틸 에스테르 그리고 이러한 대체연료(代替燃料)의 디이젤유(油)와 혼합물(混合物) 또는 그 혼합물(混合物)의 첨가제(添加劑)와의 혼합물(混合物)의 점성학적 성질(性質)과 그 크기를 실험적 방법(方法)으로 구하였다. 그 결과 상기의 액체는 모두 뉴톤니안 액체이고, 첨가제(添加劑)는 상기 혼합물(混合物)의 점성(粘性)을 낮추는데 별로 효과가 없는 것으로 판단되었다.

• Proceedings of the Korean Institute of Resources Recycling Conference
• /
• 2000.04a
• /
• pp.19-144
• /
• 2000

막대한 에너지원을 갖고 있는 고분자 폐기물은 열분해에 의하여 오일화가 가능하며 이 오일은 대체 연료유로서 사용이 가능하다. 그러나 이 연료유를 생산하기 위해서는 폐플라스틱 및 폐타이어의 경우는 공정을 서로 달리하여야 이용이 가능하며 생성유의 유질에서도 다소 차이가 있다. 올레핀계가 함유된 폐플라스틱을 열분해 오일화 하기 위해서는 분해 촉매를 사용하여야 하며 열분해유는 경유분과 d사한 성상을 갖고 있으며 폐타이어의 열분해유는 유황성분 및 BTX 분을 상당량 함유하고 있어서 경유분과는 다소 다른 성상을 갖고 있다. 또한 폐타이어 및 폐플라스틱의 열분해 기술이 사용화되기 위해서는 열분해시 발생하는 Coking 문제 극복 및 시스템에 대한 설계기술이 뒷받침되어야 한다.

• Journal of Korea Fishing Vessel Association
• /
• v.30
• /
• pp.64-68
• /
• 1987