• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1421-1432
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• 2018

Water soluble oil was obtained from the pyrolysis of coconut waste as a biomass at $600^{\circ}C$. It was studied that the combustion characteristics of bio-emulsion fuel by mixing and emulsifying 15~20% of water soluble oil which obtained from pyrolysis of coconut waste as a biomass and MDO(marine diesel oil) as a marine fuel. Engine dynamometer was used for detecting emissions, temperature, and power. The temperature of combustion chamber was decreased because the moisture in bio-emulsion fuel deprived of heat of evaporation in combustion chamber. While combustion, micro-explosion took place in the combustion chamber by water in the bio-emulsion fuel, MDO fuel scattered to micro particles and it caused to smoke reduction. The temperature reduction of combustion chamber by using bio-emulsion fuel reduced the NOx emission. The increasing of bio-oil content caused increasing water content in bio-emulsion fuel so total calorific value was reduced. So the characteristics of power was decreased in proportion to using the increasing amount of bio-emulsion fuel. Heavy oil as a marine fuel exhausts a lot of smoke and NOx. We expect that we can reduce the exhaust gas of marine engine such as smoke and NOx by using of bio-emulsion fuel as a marine fuel.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.158-158
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• 2003

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.203-203
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• 2011

• 핵융합뉴스레터
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• s.42
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• pp.10-11
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• 2009

지구온난화와 환경오염을 줄일 수 있는 하나의 방안으로 고연비의 경유를 사용하는 운송수단이 각광을 받아왔으나, 입자상 오염물질 및 질소산화물 배출량의 증가 등 경유 차량의 이용에도 문제점이 드러나고 있다. 주요 선진국들이 이와 관련한 규제를 강화함에따라 이에 대응할 수 있는 기술 개발이 요구되는 가운데 녹색 기술 개발을 이끄는 국가핵융합연구소는 플라즈마를 활용한 경유 차량의 후처리장치 개발을 추진하고 있다.

• Journal of the Korean Applied Science and Technology
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• v.33 no.3
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• pp.529-539
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• 2016

Modeling can be used to understand the atmospheric dispersion of air pollutants scientifically. Recent development of model computation enabled to simulate more diverse area. As flowing out from the emission source, the concentration profiles of air pollutants could be estimated in three dimensional space. This study used CALPUFF diffusion model to predict the diffusion of discharged NO2 and TSP on the atmosphere near a combined heat power plant and incinerator. It was investigated contribution concentration of the surrounding area by sources by comparing the actual measurement results and the results of the modeling. Contribution of emission sources to the local level of NO2 was found quite high particularly at the site, A-3. The estimated results by modelling revealed more significant effect on TSP at A-5.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.1
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• pp.45-51
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• 2015

In order to meet the enforced emission regulations and reduce fuel consumption, various new technologies are employed in engines. The problem of NOx emissions under a lean mixture condition should be solved, because a lean-burn direct-injection engine can realize stable lean combustion with a stratified mixture, which results in improvements in fuel economy and emissions. This study investigated the effects of intake and exhaust valve timing changes on the performance and emission characteristics of a lean-burn LPG direct-injection engine. Under a partial-load operating condition without throttling, an increase in the intake valve opening led to an increase in NOx emissions due to an increase in the amount of excess air. The fuel consumption deteriorated with an increase in the exhaust valve opening due to a decrease in the expansion work and an increase in the pumping loss.

• Journal of the Korean Society of Marine Environment & Safety
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• v.14 no.1
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• pp.83-87
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• 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 the Korea Organic Resources Recycling Association
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• v.20 no.4
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• pp.97-105
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• 2012

This study examined for possibility of the food wastewater incineration treatment method as one of overland treatment method by incineration through liquefied spray of food wastewater when incinerating domestic wastes under operation and for the relationship, etc of air discharge material discharged in incineration, and the results of study are as follow: The food wastewater as one of overland treatment method was analysed 94-96% of moisture contents. Temperature of incinerator outduct during mixed incineration of food wastewater with MSW was average $897^{\circ}C$ and incineration of only MSW was $925^{\circ}C$. Temperature of the mixed incineration of food wastewater was dropped about $28^{\circ}C$ by incineration of only MSW. Concentration of nitrogen oxides(NOx) among air discharge gases was studied by 50ppm, 46ppm when inputting $200{\ell}/hr$, $300{\ell}/hr$ into the incinerator as the quantity of food wastewater. In the mixed incineration of food wastewater, generation speed of scales in the inside of a tubular exhaust gas boiler became rapid and the scale generation quantity became large but the exhaust gas boiler normally operated since scales were removed in cleaning of the tube with a compressive air cleaning facility and there was no opening clogging phenomena in a filter cloth of the filtering dust collector. The overland treatment method, not ocean dumping of food wastewater can be proposed as a technology since mixed incineration of food wastewater with MSW in the existing domestic waste incineration plant is possible, and operation costs of the incineration facility were reduced since use of chemicals such as ammonia and urinary hydrogen ion excretion, etc used in incineration facilities for removing nitrogen oxides(NOx).

• JOURNAL OF ELECTRICAL WORLD
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• s.452
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• pp.29-34
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• 2014

2014년 5월 한 달 간 우리나라에서 석탄을 이용해 생산한 발전량은 약 1만5,748GW에 달한다. 이는 국내 총 발전량 중 38%에 해당하는 양이다. 특히 유연탄의 경우 kWh당 정산단가가 61.6원에 불과해 원자력(55.4원) 다음으로 경제성이 높은 발전원에 속한다. 그러나 석탄화력의 경우 황산화물, 질소산화물 및 먼지와 지구온난화의 주범으로 꼽히는 온실가스를 배출하고 있어 항상 논란의 대상이 된다. 2011년 기준으로 국내 $CO_2$ 배출량의 약 1/3 정도가 전력분야에서 발생했는데, 이 중 대부분은 석탄화력에서 배출됐다. 즉 환경을 생각하면 비중을 줄여 나가야 하는 것이 맞지만, 경제성 및 효율성을 고려하면 반드시 필요한 발전원이 석탄화력인 셈이다. 이에 비단 우리나라뿐만 아니라 전 세계 전력 산업계에서는 석탄화력의 효율은 높이면서, 온실가스 배출은 줄일 수 있는 기술개발에 적극 나서고 있다. 그 기술 중 가장 현실적이면서 대표적으로 떠오른 분야가 바로 석탄가스화복합발전(Integrated Gasification Combined Cycle, IGCC)이다. 우리나라에서도 IGCC에 대한 관심을 지속적으로 기울여 왔고, 그 노력의 결실로 현재 태안에 국내 최초의 IGCC 실증플랜트를 건설 중에 있다. 현재 IGCC 기술개발은 어느 단계까지 와 있는지, 또 국내외 시장은 얼마나 성장될 것으로 예상되는지 자세히 정리해봤다.

• Journal of the korean Society of Automotive Engineers
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• v.2 no.2
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• pp.31-39
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• 1980

복지사회적 목표에서의 도시계획 및 교통문제는 환경보전의 측면에서 상충되는 관계가 이루어 지고 있다. 특히 대도시에서 자동차의 배출가스에 의한 대기오염은 매우 심각한 관계에 이르고 있다. 우리나라에서도 앞으로 급증할 것으로 예상되는 자동차 증가율과 상대적으로 협조한 도 로의 점유율 및 이에 따른 자동차 주행 pattern의 불규칙성을 감안하면 외국과 같은 규제기준의 설정이 필요하다. 자동차 배출가스에 의한 대기오염의 심각성은 배출가스중에 들어있는, 일산 화탄소(CO), 탄화수소(HC), 질소산화물(NOx), 알데히드, 연화합물 및 발암성 방향족화합물 등 으로, 이것은 인체에 유해한 영향을 주고 있다. 이와 같은 실정에서 인간의 건강을 공해로부터 보호하기 위한 기준으로 세계보건기구 WHO 는 1972년 "WHO Technical Report Series, No.506" 에서 SO$_{2}$ 분진 일산화탄소 및 photochemical 에 대하여 기준 목표를 설치하였다.목표를 설치하였다.