• Title/Summary/Keyword: Oil S/A

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Reclamation of Waste Lubricating Oil Using Ceramic Micro/Ultrafiltration Composite Membrances (세라믹 정밀/한외여과 복합막을 이용한 폐윤활유 정제)

  • 김계태;현상훈
    • Journal of the Korean Ceramic Society
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    • v.37 no.5
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    • pp.403-409
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    • 2000
  • The permeation characteristics and reclamation efficiency of waste lubricating oil were studied as a function of the types of ceramic composite membranes and the membrane separation process variables. The oil permeability of the TiO2 composite membrane(pore size 0.015 $\mu\textrm{m}$) was directly proportional to the crossflow velocity(0.22∼0.9 m/s) and temperature(150$^{\circ}C$∼200$^{\circ}C$). In the batch concentration process, as the concentration factor increased, both the permeability and the ash content of the permeate decreased. The average ash contents of the total permeate through the A6 alumina membrane(average pore size 0.8$\mu\textrm{m}$), Z1/A6 and Z1/A4(pore size 0.23$\mu\textrm{m}$)/A7(pore size 6$\mu\textrm{m}$) zirconia composite membrances(average pore size 0.07$\mu\textrm{m}$) were about 0.063 wt%, 0.045wt% and 0.08wt% in the region of 1∼2 concentration factor, respectively. The ash content of the mixed permeate through the A6 alumina and zirconia composite membrane was about 0.06 wt% and it can be also reduced to 0.06 wt% in the Z1/A6 membrane and below 0.003 wt% in the TiO2/Z1/A6 membrane. It was concluded that the treated oil obtained from the multi-step membrane separation process could be used as reclaimed lubricating oil as well as reclained fuel oil.

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Experimental Study on Effects of PAG Oil for $CO_2$ Evaporation Heat Transfer (PAG 오일이 $CO_2$ 증발열전달에 미치는 영향에 관한 실험적 연구)

  • Lee, Sang-Jae;Kim, Dae-Hoon;Choi, Jun-Young;Lee, Jae-Heon;Kwon, Young-Chul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.5
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    • pp.357-363
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    • 2008
  • In order to investigate $CO_2$ heat transfer coefficient and pressure drop by PAG oil concentration during $CO_2$ evaporation, the experiment on evaporation heat transfer characteristics in a horizontal micro-fin tube was performed. The experimental apparatus consisted of a test section, a DC power supply, a heater, a chiller, a mass flow meter, a pump and a measurement system. Experiment was conducted for various mass fluxes($400{\sim}1200\;kg/m^2s$), heat fluxes($10{\sim}30\;kW/m^2$) and saturation temperatures ($-5{\sim}5^{\circ}C$), and PAG oil concentration($0{\sim}5\;wt%$). The variation of the heat transfer coefficient was different in accordance with the oil concentration. With the increase of the oil concentration, the evaporation heat transfer coefficient decreased and the delay of dryout by oil addition was found. Pressure drop increased with the increase of the oil concentration and heat flux, and the decrease of saturation temperature.

Production of Edible Vegetable Oil : Status and Outlook (식물성 식용유의 생산현황과 전망)

  • Rhee, Joon-Shick
    • Applied Biological Chemistry
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    • v.27
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    • pp.80-87
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    • 1984
  • Although traditional Korean diet consists of Very little fats and oils, the increase of their consumption, especially vegetable oil, has been truly remarkable in recent years and this increase is attributed to the improvement of their dietary habit and the development of Korean food industry. On the other hand, domestic production of the edible vegetable oil did not increase at all. Naturally, foreign exchange (over a several hundred million U.S. dollars) is annually used in importing oil seed and/or oil per se. Under these circumstances, it is of utmost importance to maximize the domestic production of edible vegetable oil, although its complete self-sufficiency cannot be achieved. In this seminar, intake of fats and oils by Korean people, status and outlook of the domestic production and consumption of fats and oils will be discussed, with. emphasis on the utilization of agricultural by products and waste as a source of fats and oil.

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Investigation for Change of Pump's Vibration Modes on Oil Tank (대형 tank 구조물 개선에 따른 진동변화 고찰)

  • Yang, Kyeong-Hyeon;Cho, Cheul-Whan;Cho, Sung-Tai;Song, Oh-Seop
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.36-40
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    • 2007
  • It uses a tank to store, purify and feed lube oil in power plants, which is made by steel plate. Several pumps to feed lube oil are installed on the top plate of the oil tank. In this case if pumps on the top plate are removed or added, the dynamic characteristics of the structure will be changed. In this paper, we present that we analyze in detail the similar case with a finite element model for tank & pump structure coupled with oil and that we set plan to change mode shapes on the top plate of the tank.

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"Green Sea Ranger", an Oil-Spill Model for Korean Coastal Waters

  • Hong, Key-yong;Song, Mu-seok
    • Journal of Ship and Ocean Technology
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    • v.1 no.2
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    • pp.41-49
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    • 1997
  • We reviewed various oil-spill models and condensed the integrated information into a prediction model, “Green Sea Ranger”which is applicable to Korean coastal area. The developed software consists of pre- and post-modules for environment setup and display of results and main module for the prediction of oil\`s fate. In the pre-module target areas can be selected from the included geographic information system and various environmental and optional numerical data for the prediction can be input through easy GUI or imported from the database we established. For the fate of the spilt oil we included effects of spreading, advection, evaporation, and emulsification. Preliminary numerical experiment has proved that the developed oil-spill prediction system can be easily utilized in on-site oil recovery operations which usually require a quick and reasonable prediction.

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Preparation of High-Efficient Oil-based Nanofluids and It's Application to the Transformer (고효율 나노절연유 제조 및 변압기에의 적용)

  • Yoo, Hyun-Sung;Choi, Cheol;Oh, Je-Myung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.31-32
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    • 2007
  • Oil-based nanofluids are prepared by dispersing spherical and fiber-shaped $Al_2O_3$ and AlN nanoparticles in transformer oil. Two hydrophobic surface modification processes are compared in this investigation. It is obvious that the combination of nanoparticle, surfactant and surface modification process is very important for the dispersity of nanofluids. For ($Al_2O_3$+AIN) particles with 1% volume fraction, the enhancement of thermal conductivity and convective heat transfer coefficient is nearly 11% and 30%, respectively, compared to pure transformer oil. The cooling effect of ($Al_2O_3$+AlN)-oil nanofluids on the heating element and oil itself is confirmed by a natural convection test using a prototype transformer.

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A Study on the removel of the water from the anthracite slurry by Oil Agglomeration Process(part 2) (Oil Agglomeration Process에 의한 무연탄 슬러리의 탈수에 관한 연구(제2보))

  • 오진석;신강호;조동성
    • Resources Recycling
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    • v.4 no.1
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    • pp.20-24
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    • 1995
  • When the slurry of water and coal which is produced from hydraulic coal mining was dehydrated by COM(Coal Oil Mixtue), the effects of flocculant were measured by light transmittance of supernatant liquid, The experimental results obtamed m this study are summarized as follows; The efficient flocculant is anionic flocculant(AllO), and in this case, the required concentration is about l00g/t. When diesel oil is used with flocculant, COM is formed in lower impeller speed than when only diesel oil is used. The amout of diesel oil required to form COM is 10% of that of coal.

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A Study on the Ship's Speed for Reducing the Fuel Oil Consumption in Actual Ships (선박의 연료소모량 절감을 위한 항해 속력에 관한 연구)

  • Kim, Soon-Kap;Lee, Yun-Sok;Kong, Gil-Young;Kim, Jong-Pil;Jung, Chang-Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.18 no.1
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    • pp.41-47
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    • 2012
  • Recently, due to the rapid rise of the international oil price, the burden of fuel oil expense is relatively increasing in a ship. And the international restriction of the greenhouse gas which was generated from the burning of fuel oil is also rapidly strengthened. Therefore, to reduce the greenhouse gas and fuel oil consumption, many shipping company adopted the low speed navigation and it was focused on the improvement of fuel consumption efficiency and the usage of alternative energy in the marine engine development field. In this paper, the fuel oil consumption according to the ship's speed was measured in the actual seas and analyzed the shop test results in the shipyard and the ship navigation data from the abstract log. And then it was proposed that the ship's economic speed was 14~15kts and the optimum rpm was 140~150 in specific sea conditions.

Comparative Analysis on Combustion Characteristics of Diesel Oil and Biodiesel Blends in Dl Diesel Engine (Using Soybean Oil) (직접분사식 디젤기관에서 디젤유와 바이오디젤 혼합유의 연소특성에 대한 비교 연구 (대두유를 중심으로))

  • Lim, J.K.;Choi, S.Y.;Cho, S.G.
    • Journal of Power System Engineering
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    • v.13 no.6
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    • pp.29-34
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    • 2009
  • Recently, we have a lot interest in a sudden rise of oil prices and a change weather for the earth warmming, so, development of new alternative fuels need in order to spare fossil fuel and 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 in diesel engine of compression ignition engine. In this paper, the combustion characteristics between neat diesel oil and biodiesel blends(10 vol.% biodiesel and 20 vol.% biodiesel) were tested using four stroke, direct injection diesel engine, especially this biodiesel was produced from soybean oil at our laboratory. This analysis showed that cylinder pressures, the rate of pressure rises and the rate of heat releases were decreased as the blending ratios of biodiesel to diesel oil increased because of lower heating value of biodiesel in spite of increased oxygen content in biodiesel.

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Study on the Vapor Pressure and Miseibility of R-744/Mineral and POE Oil Mixture (R-744/광유 및 POE 오일 혼합물의 증기압 및 상용성에 관한 연구)

  • Choi, H.S.;Kim, S.;Park, K.K.
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1672-1677
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    • 2003
  • Carbon dioxide($CO_2$, R-744) has become a very popular issue in application to refrigeration and air conditioning systems as a natural refrigerant. An experimental study has been carried out to investigate the vapor pressure and miscibility of refrigerant R-744 in the presence of lubricant oil. This is of particular interest in the selection of the lubricant oil for the compressor of a refrigeration system or an air conditioning system using the refrigerant R-744. This apparatus consists of the test section, measuring devices, the vacuum pump, the constant temperature bath and relevant connecting pipes made of stainless steel. Two lubricant oils, such as mineral oil(Naphthenic) and polyol ester(POE) oil, are considered in the present study. For this purpose, test runs were conducted with the oil concentration range from 5 to 50 wt%, and the temperature range from -10 to $10^{\circ}C$ with $2^{\circ}C$ intervals. The results are correlated with the vapor pressure. and showed with the miscibility as visualization for the individual text components.

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