• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.165.1-165.1
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• 2010

In the past, drivers bought a fuel additives to treat a combustion chambers or injector nozzles for carbon or gum deposit at market. But, nowadays, as raised cost of fuel for a vehicle the consumers also start focusing on a function of fuel additives that increases fuel economy of one. Some fuel additive manufacturers and agents advertise that their goods make a car it's initial state. This paper shows data for 3 years that were acquired during test for registration of an additive in domestic. The data were sorted according to kind of vehicle, kind of fuel, test mode, CO, HC, NOx, PM, total emission, fuel economy and accumulated mileage. And than by using simple linear regression analysis changes according to accumulated mileage was displayed. Normal distribution and histogram of rate of increase and decrease were displayed. the analyzed data indicated that a fuel additive maintain and make a car the first state of one but can't make a car be batter than initial the one.

• 한국분무공학회지
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• 제28권4호
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• pp.191-197
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• 2023

LPG direct injection (LPDi) technology is a method of improving the weaknesses of existing LPG vehicles by directly injection into the combustion chamber. This study was conducted on the comparison of emissions and fuel efficiency performance of the engine and vehicle by applying LPDi technology. The LPDi hybrid engine's maximum output and maximum torque were measured at an equivalent level of less than 1% compared to conventional gasoline fuel. The fuel amount was corrected using the LCU controller, and the THC, CO, and NOx emissions were reduced to 90% in the operating range of the three-way catalyst through air-fuel ratio control. The analysis of THC+NOx and CO emissions in FTP-75 (CVS-75) driving mode satisfied the US LEV III SULEV30 regulation.

• 한국수소및신에너지학회논문집
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• 제35권1호
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• pp.97-104
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• 2024

In this study, combustion experiments were conducted to assess engine performance and exhaust gas characteristics using four blends of 1-pentanol and diesel as fuel in a naturally aspirated 4-stroke diesel engine. The blending ratios of 1-pentanol were 5, 10, 15, and 20% by volume. The experiments were carried out under four different engine torque conditions (6, 8, 10, and 12 Nm) while maintaining a constant engine speed of 2,000 rpm for all fuel types. The results showed that the use of 1-pentanol/diesel blended fuel generally led to a decrease in brake thermal efficiency, attributed to the low calorific value of the blend and the cooling effect due to the latent heat of vaporization. Additionally, both brake specific energy consumption and brake specific fuel consumption increased. However, the use of the blended fuel resulted in a general decrease in NOx concentration, a decrease in CO concentration except some conditions, and a reduction in smoke opacity across all conditions.

• 청정기술
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• 제25권1호
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• pp.74-80
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• 2019

하수슬러지의 열화학적 처리는 수분을 제거하여 연료로 사용되는 하수슬러지의 수분 함량을 낮추어 주는 기술이다. 열화학적 처리된 하수슬러지는 열량이 높아지기 때문에 에너지 집약적 과정이라고 할 수 있다. 이러한 공정 중에 소비되는 에너지를 절약하기 위해 하수슬러지의 수열 탄화 공정을 사용하였다. 수열탄화 공정은 하수슬러지를 사전 건조 없이 깨끗한 고체연료로 전환할 수 있다. 본 연구는 수열탄화 하수슬러지와 미분탄 연소 시스템의 혼소 특성을 조사하는 것을 목적으로 한다. 혼소 시 생성되는 유해물질 및 연소 효율의 변화를 측정하는 것을 목적으로 한다. 본 연구에 사용 된 연소 시스템은 $80kW_{th}$급 연소로로서 1기의 선회류 버너가 장착되어 있다. 두 가지의 석탄을 주 연료로 사용하였고, 하수슬러지의 혼소율은 열량 기준 0% ~ 10%까지 진행하였다. 실험 결과 $NO_x$는 400 ~ 600 ppm, $SO_x$는 600 ~ 700 ppm 사이를 유지하였고, CO는 100 ppm 전후로 일정하게 유지되어 안정적인 연소를 확인할 수 있었다. 하수슬러지를 혼소할 경우, 혼소율이 증가할수록 $NO_x$와 $SO_x$의 배출량도 증가하였으나 그 편차가 크지 않았다. 연소 배가스에 포함된 오염 물질 배출은 혼소 비율 보다 주 연료인 석탄의 조성에 의해 크게 영향을 받는 것으로 밝혀졌다.