• Title/Summary/Keyword: MF30 class

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A Study on the Characteristics of NOx and Smoke for Diesel Engine by Fuel (연료성상에 따른 디젤엔진의 질소산화물 및 스모크 배출특성에 관한 연구)

  • Nam, Jeong-Gil;Lee, Don-Chool;Han, Won-Hui;Park, Jeong-Dae;Kang, Dae-Sun
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.145-146
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    • 2006
  • The main objective of this research is to develop a system which will provide a more efficient fuel saying measure for the current marine products industry situation caused by the increased cost of oil. For that function, the developed system has been verified using the medium of blending oil known as the MF 30 class. As a result, MF 30 was confirmed meeting the International Standard for NOx emissions and content of Sulfur. Oil composition and soot level analysis showed that it is acceptable to use MF 30 class in condition of proper engine running operation and pre-refinery treatment.

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A Study on the Variation of Physical & chemical Properties with Refining treatment and Additive mixture for Marine Fuel Oil (선박연료유의 정제처리 및 첨가제 혼합에 따른 물리.화학적 특성 변화에 관한 연구)

  • Han, Won-Hui;Nam, Jeong-Gil;Lee, Don-Chool;Park, Jeong-Dae;Kang, Dae-Sun
    • Proceedings of KOSOMES biannual meeting
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    • 2006.11a
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    • pp.291-297
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    • 2006
  • Recently it is a tendency that the use of the heavy fuel oil is investigated even from the middle&small class vessel in order to reduce the operating cost of vessel caused by with rise of international gas price. In this study, analyzed the physical & chemical properties and examined the effect of refining treatment and a fuel oil additive for MF30 fuel oil which is a mixture fuel oil mixed M.G.O and the heavy oil MF380 use to be possible in the middle&small class vessel. As a results, the effects of two of pre-refinery treatment methods as centrifugal purifier and heating & homogenizing system(M.C.H) are some feeble, but the pour point and the flash point came to be low more or less. The effect of property improvement which is caused by with the fuel oil additive did not appear positively.

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On the properties of six cores in the λ Orionis cloud: triggered or non-triggered star formation?

  • Yi, Hee-Weon;Lee, Jeong-Eun;Liu, Tie;Kim, Kee-Tae
    • The Bulletin of The Korean Astronomical Society
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    • v.45 no.1
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    • pp.58.4-59
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    • 2020
  • We present preliminary results of 1.1 and 1.3 mm dust continuum and 12CO (J=2-1) line data obtained with the Submillimeter Array toward six cores harboring Class 0/I objects in the λ Orionis cloud. They are located in bright rimmed clouds, which are exposed to the far-ultraviolet radiation field by the O-type star λ Ori. Compact dust continuum emission is observed from all six cores. Among the six cores, only one core G196.92-10.37 shows a signature of binarity with separation of 4000 AU. The numbers of singles and binaries in our sample are five and one, respectively and the derived multiplicity frequency (MF) is 0.17. This value is lower than those found in the binary surveys toward Class 0/I objects, which may be a hint for negative feedback by the nearby massive star, lambda Ori. The derived excitation temperature (Tex) using 12CO emission shows a lower median value (20 K) than those of triggered star-forming regions (30 K). The lower MF and Tex support our previous study that star formation was not triggered in the λ Orionis cloud. We aim to further investigate whether the Class 0/I YSOs in the λ Orionis cloud have less circumstellar materials and smaller accretion rates than in other filamentary clouds (e.g., Orion A & B), which might be attributed to negative feedback from the massive star in limiting accretion of protostars.

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A Study on the Variation of Physical & Chemical Properties with Refining Treatment and Additive Mixture for Marine Fuel Oil (선박연료유의 정제처리 및 첨가제 혼합에 따른 물리.화학적 특성 변화에 관한 연구)

  • Han, Won-Hui;Nam, Jeong-Gil;Lee, Don-Chool
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.13 no.1 s.28
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    • pp.39-45
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    • 2007
  • Recently it is a tendency that the heavy fuel oil is considered to be used on board even middle or small sized vessels in order to reduce the operating cost of vessel mused by a rise in international oil prices. In this study, analyzed the physical & chemical properties and examined the effect of refining treatment and a fuel oil additive for MF30 fuel oil which is a mixture fuel oil mixed M.G.O and the heavy oil MF380 use to be possible in the middle&small class vessel. As a results, the effects of two of pre-refinery treatment methods as centrifugal purifier and heating & homogenizing system(M.C.H) are some feeble, but the pour point and the flash point came to be low more or less. The effect of property improvement which is mused by the fuel oil additive did not appear positively.

  • PDF