• 한국자동차공학회논문집
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• 제3권3호
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• pp.9-18
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• 1995

The substitution of conventional fuel oil by alternative fuels is of immense interest due to liquid oil shortage and requirements of emission control standard. Among the alternative fuels, natural gas may be the most rational fuel, because of its widespread resource and clean est burning. Meanwhile, engine simulation is of great importance in engine development. Hence a zero-dimensional combustion model was developed for dual-fuel system. Natural gas was injected directly into the cylinder and small amount of distillate was used to provide the ignition kernel for natural gas burning. The intake air and exhaust gas flow was modeled by filling and emptying method. Although the single zone approach has an inherent limitation, the model showed promise as a predictive tool for engine performance. Its simulation was also made to see how the engine performance was influenced by the fuel injection timings and amount of each fuel.

• 공업화학
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• 제20권1호
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• pp.62-66
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• 2009

지속적인 연료비용의 상승 및 가채매장량의 한계로 인하여 비재래형 연료 및 공정 부산물의 연료적 가치에 대한 관심이 증가하고 있으며, 그중 대표적인 것이 오일샌드 및 이의 부산물인 코크스의 이용기술이다. 본 연구에서는 오일샌드 코킹 공정에서 발생되는 오일샌드 코크스의 에너지화 이용을 위하여 실험실 규모의 고정층 가스화 시스템을 이용한 연구를 수행하였다. TGA를 이용하여 오일샌드 역청 및 코크스의 연소 반응특성을 확인하였으며, 실험실 규모의 가스 화기를 이용하여 산소/연료 비율, 온도 및 스팀주입량에 따른 가스화 후 생성되는 합성가스의 특성을 파악하였다. 오일샌드 코크스는 높은 탄소함량, 발열량 및 황 함량 특성을 보인 반면 낮은 회재함량과 반응성의 특성을 보였다. 오일샌드 코크스 가스화의 경우 일반적으로 온도, 스팀주입량 증가 및 산소주입량 감소에 따라 $H_2$ 생성량은 증가하였으며 $CO_2$ 생성량은 감소하는 경향을 보였다. 합성가스 발열량은 $2100kcal/Nm^3$ 정도의 값을 보여 오일샌드 코크스의 수소원료 및 연료로서 이용 가능성을 확인하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.9.2-9.2
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• 2005

• Environmental Engineering Research
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• 제7권3호
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• pp.169-175
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• 2002

• 한국응용과학기술학회지
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• 제27권4호
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• pp.437-444
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• 2010

Dry Process(natural drying, hot-air drying, oil fry drying), optimized mixture ratio and the condition of carbonization was carried out in order to improve the product durability develop eco-friendly solid fuel mixing food waste and paper sludge. As a result of the experiment, oil fry drying process was the fastest method for drying food waste and paper sludge mixture that contains 80% water inside, and the optimized mixture ratio to minimize the generating concentration of chlorine gas against caloric value of mixture ratio was 7:3. Additionally proper temperature of product carbonization was about $200^{\circ}C$ and shown increasing product durability through the carbonization. Therefore, the pelletized solid fuel be shaped diameter around 0.5cm, length 2cm under which was pulverized and molded using 7:3 mixture of food waste, and paper sludge was the eco-friendly solid fuel possible to be industrialized which is consist of chlorine concentration of below 2.0wt% and the lowest caloric value of over 5,000kcal/kg. In conclusion, this developing manufacturing process of the solid fuel can be interpreted to contribute alternative energy development in accordance with low carbon and green growth era.

• 대한기계학회논문집
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• 제19권11호
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• pp.3054-3062
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• 1995

Recently, the improvement of fuel economy and the reduction of exhaust smoke and NOx have been successfully achieved by supplying diesel engines with emulsified diesel oil with water particles. In the present paper, the difference between the combustion of injected emulsified fuel and that of diesel oil spray is clarified by means of taking high-speed and color photographs of the flames in the engine cylinder. As the results, the two kinds of fuels show different combustion behavior each other in the growth of initial flame and in the termination of combustion process in the cylinder. Then, suitable combustion chamber design for the use of emulsified fuel is discussed on the basis of experimental data for various distribution of spray in different kinds of piston cavities. Some methods of clearing troubles caused by emulsified fuel injection are also discussed on the basis of performance tests with a remodeling test engine.

• 해양환경안전학회지
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• 제23권1호
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• pp.98-103
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• 2017

이 연구는 초음파 에너지의 공동현상(Cavitation)을 이용하여 선내 제조된 혼합연료유의 문제점을 개선하고 혼합연료유의 안정적인 사용이 가능하도록 하여 선박운용비의 상당부분을 차지하는 연료비를 절감하고자 한다. 실험은 선내 혼합연료유 제조 방식을 모사하여 선박용 연료유 M.G.O(Marine Gas Oil)와 MF-180(Marine Fuel-oil 180)를 각각 부피비 기준으로 0.25:0.75 및 0.75:0.25 비율로 혼합하였으며 초음파 처리장치를 이용하여 혼합연료유에 초음파 에너지를 직접 조사하여 초음파 에너지가 혼합연료유에 미치는 영향에 관해 고찰하였다. 실험결과, 선내 혼합유 제조시 보고되었던 문제점을 확인하였으며, 혼합시료유의 초음파 조사 후 잔류탄소량은 최대 28.4 % 감소하였다. 또한, 잔류탄소량 감소 및 분산 안정성 분석결과를 토대로 초음파 에너지에 의한 캐비티의 붕괴압이 연료입자 미립화에 효과가 있고, 중질연료유가 많이 함유된 혼합연료유의 일시적인 가용성을 높일 수 있을 것으로 판단되었다.

• 선박안전
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• 통권23호
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• pp.37-50
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• 2007

The test result is a part of a study on the reduction of fuel expense. the test was conducted in the ship of east sea fisheries supervision office which is modified from 139 ton trawler to 183 ton petrol ship. The result of NOx emission and Smoke Value for main engine and generator engine are measure and included in this paper. The information on pre-treatment systems and measuring equipment also includes.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2001년도 제33회 춘계학술대회 개최
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• pp.143-148
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• 2001

ILSAC GF 3/API SL specification will be adopted in July 2001. The background and characteristics of GF3 specification is reviewed. GF3 specification consists of five new engine tests, two new bench tests and new limits on three bench tests currently used to define ILSAC GF-2. GF 3 engine oil shows good performance compared to GF2 engine oil in fuel efficiency, protecting ability the emission catalyst and high temperature oxidation stability.

• 한국연소학회지
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• 제15권1호
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• pp.43-49
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• 2010

Co-combustion of syngas in an existing boiler can be one of the options for replacing conventional fossil fuel with alternative fuels such as waste and biomass. This study is aimed to investigate effects of syngas cocombustion on combustion characteristics and boiler efficiency. An experimental study was performed for a pilot-scale furnace with 4 oil burners. Tests were conducted with mixture-gas as a co-combustion fuel and heavy oil as a main fuel. The mixture-gas was composed of 15% CO, 7% $H_2$, 3% $CH_4$ and 75% $N_2$ for simulating syngas from air-blown gasification. And LHV of the mixture-gas was 890 kcal/$Nm^3$. Temperature distribution in the furnace and flue gas composition were measured for various heat replacement ratio by the mixture gas. Heat loss through the wall was also carried out through heat & mass balance calculation, in order to obtain informations related to boiler efficiency. Experimental results show that similar temperature distribution and flue gas composition can be obtained for the range of 0~20% heat replacement by syngas. NOx concentration is slightly decreased for higher heat replacement by the syngas because fuel NOx is decreased in the case. Meanwhile, heat loss is a bit decreased for higher heat replacement by the syngas, which implies that boiler efficiency can be a bit decreased when syngas co-combustion is applied to a boiler.