• Title/Summary/Keyword: emulsion fuel

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Burner combustion characteristics of hybrid type water mixing emulsion fuel (하이브리드형 물혼합 에멀젼 연료의 버너 특성)

  • Kim, Cheol-Jeong;Kim, Dong-Kwon;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.4
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    • pp.308-315
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    • 2013
  • Water emulsion technology has the problem of unstable combustion due to the rapid separation of water. To solve the problem, a hybrid mixing device was developed. The device attached on the burner was tested. As a result, the fuel consumption reduced to 12% in the similar condition of exhaust emissions and flame temperature, and 45.5%, 98.5% and 97.2% of NOx, CO, and smoke were reduced at the same inlet air and fuel flow rate.

Performance and Emission Studies in a DI Diesel Engine Using Wood Pyrolysis Oil-Bio Diesel Emulsion (목질계 열분해유-바이오 디젤 유상액을 사용하는 직접분사식 디젤 엔진의 엔진성능 및 배기특성에 관한 연구)

  • Lee, Seokhwan
    • Journal of ILASS-Korea
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    • v.17 no.4
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    • pp.197-204
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    • 2012
  • The vast stores of biomass available in the worldwide have the potential to displace significant amounts of fuels that are currently derived from petroleum sources. Fast pyrolysis of biomass is one of possible paths by which we can convert biomass to higher value products. The wood pyrolysis oil (WPO), also known as the bio crude oil (BCO), has been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of WPO in a diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the WPO. One of the easiest way to adopt WPO to diesel engine without modifications is emulsification of WPO with diesel or bio diesel. In this study, a DI diesel engine operated with diesel, bio diesel (BD), WPO/BD emulsion was experimentally investigated. Performance and gaseous & particle emission characteristics of a diesel engine fuelled by WPO/BD emulsion were examined. Results showed that stable engine operation was possible with emulsion and engine output power was comparable to diesel and bio diesel operation.

A Study on Treatment of Wastes from the Uranium Ore Dissolution/purification and Nuclear Fuel Powder Fabrication (우라늄 정광의 용해/정제 및 핵연료 분말 가공공정에서 발생된 폐액의 처리에 관한 연구)

  • Jeong, Kyung-Chai;Hwang, Seong-Tae
    • Applied Chemistry for Engineering
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    • v.8 no.1
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    • pp.99-107
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    • 1997
  • This study Provides the treatment methods of liquid wastes from the dissolution/purification process of nuclear fuel raw material and the fabrication process of nuclear fuel powder. One of the treatment methods is to process liquid waste from uranium raw material dissolution/purification process. This waste, of the strong acid, can be reused to dissolve the fine ADU particles in filtrate which is ADU waste of pH 8.0 converted from AUC waste after recovery of uranium. To dissolve the fine ADU particles, ADU filtrate was pretreated to pH 4.0 with the dissolution/purification waste, and then mixed with the lime to pH 9.2 and aged for 30 minutes. From this processing, uranium content of the filtrate was decreased to below 3ppm. The waste from fuel powder fabrication is emulsified solution dispersed with fine oil droplets. This emulsion was destroyed effectively by adding and mixing the nitric acid with rapid heating at the same time. After this processing, $Na_2U_2O_7$ compound is produced by addition of NaOH. Optimum condition of this processing was shown at pH 11.5, and uranium content of the filtrate was analyzed to 5ppm. To remove the trace of uranium in the filtrate, lime should be added. Otherwise, 4N nitric acid was used to destroy the emulsion directly, and then lime was added to this waste. Uranium content of the treated filtrate was below 1 ppm. In addition to these wastes, the trace of uranium in filtrate after recovery of uranium from the AUC waste which is produced during PWR power preparation, is treated with NaOH to takeup fluorine(F) in the waste because fluorine is valuable and toxic material. In the finally treated waste, uranium was not detected.

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Combustion Characteristics of MDO and MDO Emulsion in Automotive Diesel Engine (선박 디젤유 및 선박 디젤유 에멀젼을 이용한 자동차용 디젤엔진의 연소특성)

  • Park, Jin-Kyu;Oh, Jung-Mo;Kim, Hyung-Ik;Lee, Chang-Hee;Lee, Ki-Hyung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.9
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    • pp.945-951
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    • 2012
  • A water emulsion fuel can be used to reduce soot and NOx emissions simultaneously because it has a lower combustion temperature and better fuel atomization owing to the evaporative latent heat and microexplosion of water. Moreover, it can be used without making special modifications to conventional diesel engines. Therefore, this fuel has attracted considerable research attention. In addition, lower-grade fuels are being considered for use in conventional engines because of an increase in oil prices. In this study, we investigated the combustion and exhaust characteristics of MDO (marine diesel oil), which has a lower grade than common diesel oil, and ME (MDO water emulsion) under various test conditions in an automotive diesel engine.

Effect of Ambient Temperature and Droplet Size of a Single Emulsion Droplet on Auto-ignition and Micro-explosion (단일 유화액적에서의 분위기 온도와 액적크기에 따른 자발화와 미소폭발의 영향)

  • Jeong, In-Cheol;Lee, Kyung-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.49-55
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    • 2007
  • The characteristics of auto-ignition and combustion process of a single droplet of emulsified fuel suspended in a high-temperature air chamber have been investigated experimentally with various droplet sizes, surrounding temperatures, and water contents. The used fuels was n-Decane and it was emulsified with varied water contents whose maximum is 30%. The high-speed camera has been adopted to measure the ignition delay and flame life time. It was also applied to observe micro-explosion behaviors. The increase of droplet size and chamber temperature cause the decrease of the ignition delay time and flame life-time. As the water contents increases, the ignition delay time increases and the micro-explosion behaviors are strengthened. The starting timings of micro-explosion and fuel puffing are compared for different droplet sizes and the amount of water contents.

An Analytical Evaluation on the flue Gas and Combustion Efficiency of Emulsion Fuel (에멀죤 연료의 연소 배출가스특성 및 연소 효율에 관한 분석평가)

  • Park, Hyun-Mee;Eo, Yun-Woo;Baig, Seung-Woo;Park, Il Yong;Paeng, Ki Jung;Kim, Young-Man;Lee, Kang-Bong
    • Analytical Science and Technology
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    • v.15 no.5
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    • pp.427-432
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    • 2002
  • The combustion behavior of heavy oil and its emulsion with water was evaluated. The concentration of $SO_x$ in the combustion gas of emulsion oil was reduced to 57% with respect to that of the combustion gas from neat heavy oil. Also, the concentration of $NO_x$ in the combustion gas of emulsion oil was reduced to 67% with respect to that of the combustion gas of neat heavy oil. These reductions of $SO_x$ in the combustion gas of emulsion oil seems to be due to the reaction with salts included in surfactant of emulsion oil. Also, the combustion efficiency of emulsion oil is evaluated to be about 6% higher than that of neat heavy oil.

Characteristics of ignition and micro-explosion for droplets of water-in-fuel emulsion (유화액적 연료의 점화와 미소폭발의 특성)

  • Jeung, Incheol;Lee, Kyung-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.1
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    • pp.1-8
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    • 2013
  • The water-in-fuel droplets were applied to investigate the effect of mixing ratio between water and decane, ambient temperature, droplet size and spacing between droplets on ignition and micro-explosion in a heated chamber with high temperature. The ignition temperature of droplet was found lower as the droplet size was increased and the contents of water was decreased. The life time of droplet, however, decreases as the contents of water increases due to the micro-explosion. The occurrence of micro-explosion also increases as the size of droplets and the ambient temperature increase. The flame spread speed gets faster as the contents of water and the number of suspender decreases.

Basic Study of Behavior Characteristics of Emulsified Fuel with Fuel Design (연료설계에 의한 에멀젼연료의 거동특성에 관한 기초연구)

  • Yeom, Jeong-Kuk
    • Journal of Power System Engineering
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    • v.19 no.3
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    • pp.22-28
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    • 2015
  • A compression ignition type of diesel engine makes fuel efficiency better and $CO_2$ in the exhaust gas lower. Also it is suitable to apply alternative fuels(blended fuel) to the engine. The objective of this study is the emissions reduction of diesel engine with EF(Emulsified fuel). The emulsified fuel consists of diesel and peroxide($H_2O_2$) and Soot reduction without worsening of NOx emissions can be achieved by using thermal decomposition of the peroxide, i.e. the chemical effect of the OH radical in actual engine. For manufacturing emulsified fuel, a surfactant which is comprised of span 80 and tween 80 mixed as 9:1, was mixed with a fixed with 3% of the total volume in the emulsion fuel. In addition, considering the mixing ratio of the surfactant, the mixing ratio of $H_2O_2$ in the emulsified fuel was set as EF0, EF2, EF12, EF22, EF32, and EF42, respectively. Consequently, this study aims to obtain the optimization of fuel design(mixing) for the emulsified fuel applying to the diesel engine.

Breakup and Ignition Observation of n-Dodecane Emulsion Single Droplet using Two Pulse Lasers (독립된 두 레이저를 이용한 n-Dodecane 에멀전 단일 액적의 분열 및 점화 현상의 관찰)

  • Jang, Gyu Min;Jung, Yongjin;Lee, Min Jung;Kim, Nam Il
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.213-214
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    • 2015
  • Breakup and ignition of single droplet were experimentally investigated using two independent Nd-YAG lasers. The emulsified fuel was made from n-dodecane and water while varying the relative volumetric fraction. As a result of visualization, breakup and ignition behaviors were dependent on the fraction. Luminosity from the secondary droplets increased as the water fraction decreased. Ignition did not occur below 80% of the n-dodecane fraction.

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