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안국영,백승욱,김관태,An, Guk-Yeong,Baek, Seung-Uk,Kim, Gwan-Tae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
석탄슬러리 액적은 석유와 취급의 유사성 때문에 석유 대체에너지로서 중용하게 인식되어지고 있으며, 석유계의 연료와 비슥한 방법으로 분무연소 시키는 것이 가능하여 종래의 중유사용 연소장치를 최소한 개조하여 사용할 수 있다는 이점이 있다. 따라서 석탄슬러리 액적의 연소에 관한 연구가 활발히 진행되고 있으나 혼합되는 연료의 종류 또는 연소 및 열전달기수에 대한 해석 방법이 다양하여 아직 체계화되지 못하고 있으며 논란의 여지도 없다. The ignition and combustion characteristics of CWS droplets were investigated in the postflame region generated by a flat burner. The effect of radiation by screen and heating eleements ws taken into account. Also the theoretical claculations considering the temporal temeprature variation have been performed and compared with experimental results. The ignition delays were reduced by the radiation of the screen or heating elements. Therfore the radiation was considered to play some role in predicting the ignition delay.
안국영,백승욱,김관태 대한기계학회 1993 대한기계학회논문집 Vol.17 No.5
본 연구에서는 CWS액적을 대상으로 주위 분위기 조건등에 대하여 점화등의 연소현상을 평가하기 위한 실험장치를 구성하고 일련의 실험을 수행하였다. Coal-Water slurry (CWS) is a new potential form of fuel for use in power plants and industrial furnaces. The evaporation and ignition characteristics of CWS have been studied in the post-flame region generated by a flat flame burner. Individual droplets with initial diameters of 1-3mm were supported around the thermocouples and raidly exposed to a hot gas stream. The gas temperature ranged between $950^{\circ}C$ and 1600.deg. C at atmospheric pressure. The effect of droplet size, gas temperature and radiative heat transfer by screen were studied experimentally. The ignition criterion was either a rapid temperature rise in time-temperatuire curves or onset of visible flame in experiment. Incresing the gas temperature or decreasing the droplet size reduced the time required for evaporation and ignition.
다단연소를 이용한 저 NOx 버너의 연소특성에 관한 연구
안국영,김한석,조은성,An, Guk-Yeong,Kim, Han-Seok,Jo, Eun-Seong 한국기계연구원 1997 硏究論文集 Vol.27 No.-
The characteristics of combustion and emissions in multi-staged oil burner have been experimentally studied for the various range of equivalence ratios, drop sizes and fuel formulations. Malvern system was used to measure droplet size of fuel. Light fuel oil and light fuel oil doped with pyridine($C_5H _5N$) were used to investigate the effects on fuel NOx emission. The emissions of NO and CO in exhaust gas and the flame temperatures were measured by the gas analyzer and thennocouples. NOx emissions were increased by increasing the excess air ratio (range:$lambda=1.1-1.4$) or decreasing the SMD of droplet in single-staged burner. In comparison with the single-staged burner, the emission of NOx in multi-staged burner was reduced by 50% but CO emission was slightly increased. It is found that multi-staged burner has a good capability in reducing thermal NOx resulting from the distributed heat release rate and lower flame temperature in fuel-rich and fuel-lean combustion zone. Moreover, the fuel NOx emission of the multi-staged burner is lower than that of single-staged burner, because multi-staged burner has fuel rich zone where fuel N is converted to $N_2$ more than NO. In 3-staged burner, the percentage of each stage combustion air have strong influence on emission characteristics. It is also found that NOx emission can be reduced by decreasing inner and outer air percentage or increasing middle air flow rate and CO emission is vice versa.
동축 공기다단 LPG화염의 NOx 생성특성에 관한 연구
안국영,백승욱,김한석,유명종,김호근 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
다음과 같다.(1) 과잉공기비를 증가시키면 Prompt NOx는 감소되며 연소영역의 온도는 저하되지만, N2와 O2의 농도 증가로 Thermal NOx의 발생량은 증가하였고 NOx의 총 발생량도 증가하였다. (2) 3단 공기 공급단의 선회수가 증가할수록 연료로의 원활한 공급이 어려워 Thermal NOx의 발생은 억제되며 Prompt NOx는 발생 영역은 증가한다.(3) 공기 다단 연소기를 이용한 LPG 연소시 과잉 공기비를 증가시키면 NOx의 발생이 증가하지만 3단 공기 공급단의 선회강도를 증가하는 경우 약 10% 정도의 NOx가 저감됨을 알 수 있었다.