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김종민(Jong-Min Kim),이승로(Seungro Lee),금성민(Sung-Min Kum),이호연(Ho-Yeon Lee),윤희중(Hee-Jung Yun),이창언(Chang-Eon Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Recently, strict pollutant regulations of NOx emission and increasing awareness of the environmental damage stimulated interest in research to obtain useful information regarding CO and NOx reductions at the same time. In this study, Premixed flame was experiment to reduce CO and NOx emission level by heat exchanger location in which burner and first heat location distance(L₁) and first and second heat location(L₂) changed. To reduce the NOx emission, first heat exchanger location(L₁) was decided near the flame. After first heat exchanger(L₁) was decided for the optimal NOx emission(about 30 ppm), in order to decide the optimal CO emission(about 30ppm), seocond heat exchanger location(L₂) was tested and decided for several cases. Finally, the optimal location of heat exchanger for minimal CO and NOx emission simultaneously was determined and suggested.
층류 CH<sub>4</sub>/Air 예혼합화염의 하류영역에서 NO 농도 예측을 위한 열손실 모델의 검토
황철홍,이창언,금성민,이기만,신명철,김세원,Hwang, Cheol-Hong,Lee, Chang-Eon,Kum, Sung-Min,Lee, Kee-Man,Shin, Myung-Chul,Kim, Se-Won 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
One-dimensional modeling of $CH_4$/air premixed flame was conducted to validate the heat loss model and investigate NOx formation characteristics in the postflame region. The predicted temperature and NO concentration were compared to experimental data and previous heat loss model results using a constant gradient of temperature (100 K/cm). The following conclusions were drawn. In the heat loss model using steady-state heat transfer equation, the numerical results using the effective heat loss coefficient ($h_{eff}$) of $1.0\;W/m^2K$ were in very good agreement with the experiments in terms of temperature and NO concentration. On the other hand, the calculated values using the constant gradient of temperature (100 K/cm) were lower than that in the experiments. Although the effects of heat loss suppress NO production near the flame region, a significant difference in NO concentration was not found compared to that under adiabatic conditions. In the postflame region, however, there were considerable differences in NO emission index as well as the contribution of NO formation mechanisms. In particular, in the range of ${\phi}\;{\geq}\;0.8$, the prompt NO mechanism plays an important role in the NO reduction under the adiabatic condition. On the other hand, the mechanism contributes to the NO production under the heat loss conditions.
예혼합 화염후류에서 열전달이 CO 및 NOx 생성 특성에 미치는 영향
김종민(Jong-Min Kim),김태현(Tae-Hyun Kim),금성민(Sung-Min Kum),김세원(Se-Won Kim),장기현,이창언(Chang-Eon Lee) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Strict pollutant regulations of NOx emission and increasing awareness of the environmental damage stimulated interest in research to obtain useful information regarding CO and NOx reductions at the same time. In this study, CH₄/air premixed flame was examined numerically to reduce CO and NOx emission level simultaneously in the post-flame region by the heat loss models which radiative and combined conductive and convective heat losses were included. To reduce the NOx emission, first heat exchanger location was decided near the flame. After 1st heat exchanger was decided for the optimal NOx emission(about 30ppm), in order to decide the optimal CO emission(about 30ppm), 2nd heat exchanger location was tested and decided for several cases. Finally, the optimal location of heat exchanger for minimal CO and NOx emission simultaneously were determined and suggested.
예혼합 화염후류에서 열전달이 CO 및 NOx 생성 특성에 미치는 영향
김종민(Jong-Min Kim),김태현(Tae-Hyun Kim),금성민(Sung-Min Kim),김세원(Se-Won Kim),장기현(Gi-Hyun Jang),이창언(Chang-Eon Lee) 한국연소학회 2008 한국연소학회지 Vol.13 No.4
Strict pollutant regulations of NOx emission and increasing awareness of the environmental damage stimulated interest in research to obtain useful information regarding CO and NOx reductions at the same time. In this study, CH₄/air premixed flame was examined numerically to reduce CO and NOx emission level simultaneously in the post-flame region by the heat loss models in which radiative and combined conductive and convective heat losses were included. To reduce the NOx emission, first heat exchanger location was decided near the name. After first heat exchanger was decided for the optimal NOx emission(about 30ppm), in order to decide the optimal CO emission(about 30ppm), seocond heat exchanger location was tested and decided for several cases. Finally, the optimal location of heat exchanger for minimal CO and NOx emission simultaneously were determined and suggested.
김종민(Jong Min Kim),이재박(Jae park Lee),유병훈(Byeong hun Yu),금성민(Sung Min Kum),이창언(Chang Eon Lee),이승로(Seungro Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.9
본 연구는 비예혼합화염보다 화염길이가 짧고 당량비 조절을 통해 NOx 및 CO 배출량을 제어할 수 있는 예혼합방식의 버너를 설치하고, 버너와 열 교환기 사이의 거리가 각각 30, 40, 50㎜인 3종의 열교환기에 대해 당량비를 변화시킬 때 NOx 및 CO의 배출특성을 비교하고 열교환기의 열전달특성을 검토한 것이다. 실험결과 버너와 열교환기의 거리변화와 관계없이 당량비가 증가할수록 화염온도가 높아져 NOx 및 CO 배출량도 증가한다. 또한 CO 배출량은 버너와 열교환기 사이의 거리가 가까울수록 높게 나타난다. 본 실험범위에서 A type 열교환기(버너와 열교환기 사이 거리 30 ㎝)를 당량비 0.75(CO 94.5ppm, NOx 11.2ppm, 효율 84.1%)에서 운전하는 것이 최적조건으로 나타났다. In this study, the heat transfer characteristics and NOx and CO emissions of a heat exchanger were investigated using a premixed burner. The experiments involved changing the distance between the burner and heat exchanger to 30, 40, and 50 ㎜ with various equivalence ratios. The results showed that the NOx and CO emissions increased as the equivalence ratio was increased because the flame temperature increased, regardless of the distance between the burner and heat exchanger. In particular, the CO emission increased significantly as the distance between the burner and heat exchanger was decreased. The optimal equivalence ratio for the A-type heat exchanger (distance between the burner and heat exchanger: 30 ㎝) was 0.7 in the experimental range. In this case, the CO and NOx emissions were 94.5 ppm and 11.2 ppm, respectively, and the efficiency was 84.1%.
김종민(Jong-Min Kim),이재박(Jaepark Lee),금성민(Sung-Min Kum),이승로(Seungro Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
The purpose of this study is to investigate NOx and CO emission and thermal efficiency of heat exchanger were studied with changing distances between burner and heat exchanger, and equivalence ratio. The burner exists in front of a heat exchanger like boiler, the thermal efficiency of heat exchanger is not only important, but the characteristics of pollutant emission should be considered, in this study, a circular tube type of heat exchanger in front of premixed burner, which has a shorter of flame length than that of non-premixed burner and can control NOx and CO emission by adjustment of equivalence ratio, was installed.
김석철,배동규,한지웅,금성민,이창언,Kim, Seok-Cheol,Bae, Dong-Kyu,Han, Ji-Woong,Kum, Sung-Min,Lee, Chang-Eon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
The purpose of this study is to develop the non-gravity fluidized dryer. In this non-gravity fluidized dryer the fluidized zone is produced by two paddles in mixer, which maximizes the surface area of materials and then heated air through the guiding panels dehumidify them. This can conduct the drying process quickly and control moisture contents to lower limits. The ventilation system is closed loop system, which can be changeable to open system, and can be used as a multi-purposed dryer in which mixing, drying, granulating and cooling process is conducted. In order to develop the non-gravity fluidized dryer, in the first fundamental experiments were performed to mixing accuracy and then the other parts of dryer and control system were examined to check whether they were designed properly and operated harmoniously with mixer. Also the preparatory experiments were fulfilled to examine the efficiency and reliability of the dryer. Lastly, on the basis of preparatory experiments, performance test for the non-gravity fluidized dryer carried out for the variation of the initial moisture contents, desired moisture contents, heated air velocity and heating temperature.
DME/Air 비예혼합화염에서 NOx 생성특성에 관한 연구
황철홍(Cheol-Hong Hwang),김태현(Tae-Hyun Kim),이창언(Chang-Eon Lee),금성민(Sung-Min Kum),김종현(Jong-Hyun Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The NOx emission characteristics of DME in laminar coaxial jet and counterflow nonpremixed flames were investigated using experimental and numerical approaches, respectively. The flame structure and NOx emission of DME were compared with those of C₂H? and C₃H?. Experimental results show in coaxial jet flame that DME flame has the characteristics of partial premixed flame and the flame length decreases up to 1/3 than that of C₃H? in the same condition of fuel mass flowrate. Then, the NOx emission of DME decreases to 40% approximately, comparing with that of C₃H?. In the calculated results of counterflow nonpremixed flame, DME flame shows the EINO decreases up to 50% approximately than those of C₂H? and C₃H? flames when the equivalent fuels are consumed per unit mass and time. Although the overall NOx reaction path of DME is similar with other hydrocarbon fuels, it can be identified that DME flame has a distinct NO reduction mechanism due to the reburning NO chemistry in fuel rich region.