• 한국연소학회:학술대회논문집
• /
• 한국연소학회 2013년도 제46회 KOSCO SYMPOSIUM 초록집
• /
• pp.19-20
• /
• 2013

The cofiring of renewable fuel in coal fired boilers is an attractive option to mitigate $CO_2$ emissions, since it is relatively low cost option for efficiently converting renewable fuel to electricity by adding biomass as partial substitute of coal. However, it would lead to reduce plant efficiency and flexibility in operation, and increase operation cost and capital cost associated with renewable fuels handling and firing equipment. The aim of this study is to investigate reduction of carbon dioxide at varying percentage of biomass in fuel blend to the boiler biomass, and estimate operation and capital cost. Wood pellet, PKS (palm kernel shell), EFB (empty fruit bunch) and sludge are considered as a renewable fuels for a cofiring with coal. Several approaches by the cofiring ratio are chosen from past plant demonstrations and commercial cofiring operation, and they are evaluated and discussed for CO2 reduction and cost estimation.

• 한국유기농업학회지
• /
• 제22권4호
• /
• pp.531-547
• /
• 2014

This study analyzed the effect of Greenhouse of wood pellet fuel conversing from Diesel. Analyzed through a life cycle assessment of greenhouse gas emissions of carbon dioxide for the environmental assessment, In evaluation of the Ministry of the Environment, analyzed through the life cycle assessment of carbon dioxide emissions of the greenhouse gas and, In the case of economic evaluation, we analyzed the investment payback period to the total revenue generated by each of the calculated incentive based on the RHI and institutions reduction projects a reduction of costs associated with the reduction of fuel costs.

• 한국소음진동공학회논문집
• /
• 제23권6호
• /
• pp.520-526
• /
• 2013

This article presents the reduction of vibration generated by an automobile fuel pump. In order to analyze the vibration of the fuel pump, a simplified dynamic model is established, which is composed of a rigid rotor and a equivalent springs. The equivalent stiffnesses of the upper and lower assemblies are evaluated by the comparison of modal testing results and the finite element analysis. The stiffness for the oil film of the journal bearing is extracted by using Reynold's equation. In addition, the time responses for the vibration of the fuel pump are computed by using a commercial multi-body dynamics software, RecurDyn. Based on these results, some design suggestions are proposed to reduce the vibration of an automobile fuel pump.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 춘계학술대회논문집
• /
• pp.858-861
• /
• 2006

In this paper, a study on the noise reduction in a mobile fuel cell system is presented. Among various fuel cell systems around 20W capacities designed for mobile electronic devices, the active direct methanol fuel cell (DMFC) systems have been recently developed. In such systems, the primary noise source is the air pump which provides sufficient air flow ($5{\sim}6$ liter/min) for electrochemical reaction with methanol fuel while the noise contributions from other auxiliary parts are relatively small. Especially, the discrete noise tones generated by the air pump are dominant and those frequency peaks related to the rotor harmonics are needed to be suppressed by a silencer. Therefore. the Herschel/Quinke (HQ) tubes, which use the out-of-phase cancellation of acoustic waves propagating through direct and indirect pathways, are applied to the inlet of the air pump. Performance of noise reduction with HQ silencer is analytically estimated by calculating the transmission. The length and number of thin HQ tubes are optimized to decrease the radiated noise. As a result, the sound pressure level could be successfully reduced by about 10 dB after applying three serially connected HQ tubes.

• 한국항공운항학회지
• /
• 제21권4호
• /
• pp.62-70
• /
• 2013

As the aviation industry looks to the future, fuel saving and $CO_2$ emission reduction play a dominant role in meeting the business challenges presented by global financial uncertainty. The IATA and International Government effort to save fuels, and then save 4 billion gallons of fuel burned, while reducing $CO_2$ emissions by 34 million tons. The various reduction methods adapted airlines and airports. We focused on optimized flight operation procedures for saving fuel and reduction emission cases. IATA and Canada government research reports focused on four methods that Engine Core Washing, Portable Water Management, Single Engine Taxi, APU limit operation. Apply to domestic airlines fuel data, Engine Core washing was saving more than Twenty-four thousand tons $CO_2$ emissions.

• 대한기계학회논문집B
• /
• 제30권3호
• /
• pp.193-200
• /
• 2006

The purpose of this study is to compare the part-load performance of a SOFC/GT hybrid power system with three different kinds of load-following operation modes. The primary mode for the part load operation of a hybrid power system is the reduction of supplied fuel (e.g., fuel control mode) to the hybrid system. The other two options, i.e., variable speed and VIGV controls, are related to the reduction of supplied air simultaneously with the reduction of supplied fuel to the system. With the performance analysis of a SOFC/GT hybrid power system, it is concluded that the variable speed con佐ol mode Provides the best performance for the part-load operations. It is also found that the VIGV control mode, with its better performance behavior than the fuel control mode, can be used as an important option for the part-load operation especially in case that the variable speed control mode can not be adopted.

• Journal of the Korean Wood Science and Technology
• /
• 제41권6호
• /
• pp.594-605
• /
• 2013

목질계 바이오매스는 폐기물 다음으로 가장 경제적이고 온실가스 감축 잠재력이 높은 것으로 알려진 신재생에너지원으로서 이를 이용해 개발된 바이오에너지 중에서 수송과 이용이 편리하고 발열량이 높은 목재 펠릿은 아직 가격이 다소 높지만 유럽과 일본에서는 이미 높은 보급률의 신재생에너지로 활용되고 있다. 기존 화석연료의 목재 펠릿 등 목질 바이오매스로의 연료전환을 통하여 온실가스 감축사업으로 활용하는 경우는 일본의 JCDM에서 활성화되어 있으나, 우리나라는 아직 그 기준 및 방법론 등이 정립되어 있지 않아 현재 LNG로 전환되는 사업이 활성화 되어있고 목질바이오매스 전환 사업은 등록되지 못하고 있는 실정이다. 본 연구를 통해 JCDM에 등록된 목질 바이오매스 연료전환 사업을 분석하고, 2012년 KVER에 등록된 중소기업의 LNG 연료전환 사업을 기본 데이터로 하여 시나리오로 가정한 목재 펠릿으로의 연료전환 사업과 JCDM 사업, KVER의 LNG 연료전환 사업과의 비교 분석을 통하여 펠릿 연료 전환시 투자비 대비 연간 온실가스 감축효과, 연료 단가 차익으로 인한 수익과 온실가스 감축 이득 등의 수익을 비교 분석함과 동시에 온실가스 감축효과와 경제성을 분석하였다.

• 한국자동차공학회논문집
• /
• 제4권2호
• /
• pp.106-114
• /
• 1996

Extensive experiments were conducted to investigate the emission of DI diesel engine by using DMC(dimethyl carbonate) as an oxygenated fuel additives. The results indicate that smoke reduces almost linearly with fuel oxygen contents. Reductions of HC and CO were attained noticeably, while a small increase in NOx was encountered concurrently. The effective reduction in smoke with DMC was maintained with the presence of CO2, which suggested a low NOx and smoke operation could be obtained in combination of using oxygenated fuel and EGR. Further experiment was conducted a thermal cracking set-up for mechanism studies.

• Journal of Advanced Marine Engineering and Technology
• /
• 제28권3호
• /
• pp.516-521
• /
• 2004

In this paper, the effects of ethanol blended gasoline on emissions and their catalytic conversion efficiencies characteristics were investigated in gasoline engine with an electronic fuel injection. The results showed that the increase of ethanol concentration in the blended fuels brought the reduction of THC and $CO_2$ emissions from the gasoline engine. THC emissions were drastically reduced up to thirty percent. And brake specific fuel consumption was increased. but brake specific energy consumption was similar level. However. unburned ethanol and acetaldehyde emissions increased. The conversion efficiency of Pt/Rh based three-way catalysts and the effect of ethanol on CO and NOx emissions were investigated by the change of engine speed. load and air/fuel ratio. Furthermore, the ethanol blended fuel results in the reduction effect of THC. CO and NOx emissions at idle speed.

• 대한기계학회논문집
• /
• 제11권5호
• /
• pp.819-827
• /
• 1987

본 연구에서는 예혼합화염에 물을 촘가하였을 때의 물/연료 체적비에 따른 화 염온도, 불완전가스농도(CO, THC, H$_{2}$), soot 농도를 측정하여 물이 연소효율에 미치는 영향을 고찰하고자 한다.