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석탄점화온도의 직접적인 측정에 의한 촤산화 반응율에 대한 실험적 연구
권종서(Jong Seo Kwon),김량균(Ryang Gyoon Kim),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 연구의 목적은 한국화력발전소에서 사용되는 석탄의 촤 산화반응율을 연구하는 것이다. 석탄촤 산화반응율은 입자의 점화온도에 근거한 Semenov 의 열착화이론을 활용하여 도출하였다. 이에 필요한 석탄촤 입자의 점화온도는 가열 및 측정이 가능한 열전대를 통해 직접적인 방법으로 측정하였다. 아역 청탄인 WIRA 와 역청탄인 YAKUTUGOL 의 석탄화 점화온도는 입자 직경의 변화에 따라 측정을 했으며, 입자의 직경이 커질수록 석탄화 점화온도는 상승하였다. 입자 직경에 따른 석탄촤 점화온도의 결과를 통해 활성화 에너지 및 빈도인자를 도출하였다. 본 연구를 통해 도출한 석탄촤 산화반응율 값을 기존의 연구 데이터와 비교한 결과 유사함을 확인할 수 있었다. The experiment was designed to study the char oxidation kinetics of pulverized coals commonly utilized in Korean power plants. The kinetics has been estimated using the Semenov’s thermal spontaneous ignition theory adapted to coal char particle ignition temperature. The ignition temperature of coal char particle is obtained by a direct measurement of the particle temperature with photo detector as well as by means of a solid thermocouple which is used as both a heating and a measuring element. The ignition temperatures for subbituminous coal WIRA and bituminous coal YAKUTUGOL have been measured for 4 sizes in the range of 0.4 - 1 ㎜. The ignition temperature of the particle increases with the increasing diameter. The results were used to calculate the activation energy and the pre-exponential factor. As a result, the kinetics is an agreement with ones reported from other investigations.
권종서(Jong Seo Kwon),김량균(Ryang Gyoon Kim),장영준(Young June Chang),전충환(Chung Hwan Jeon),송주헌(Ju Hun Song) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In this study, the experimental of the ignition of methan-air mixture by a Hot-surface has been carried out. It was introduced to an experimental method of flame visualization and ignition delay by hot-surface. The flame was visualized using schlieren method, and reliable ignition delay time was obtained by synchronizing PDS and thermocouple. Based on the data obtained through schlieren method, it was found that the flame front of the mixed gas’s initial ignition was first formed at the contact point with the hot-surface and then developed to the nozzle. The P.D.S. could measure to the intensity of the flame luminous and the ignition temperature was obtained by a thermocouple. Reliable ignition delay was determined by synchronizing these two methods.
석탄점화온도의 직접적인 측정에 의한 아역청탄 촤산화 반응율에 대한 실험적 연구
권종서(Jong Seo Kwon),김량균(Ryang Gyoon Kim),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
The experiment was designed to study the coal char oxidation kinetics. The kinetics has been estimated using the Semenov's thermal spontaneous ignition theory adapted to coal char particle ignition temperature. The ignition temperature of coal char particle is obtained by a method of direct measurement of the particle temperature. The ignition temperature is detected by means of a thermocouple which is used as both a heating and a measuring element. The ignition temperatures for bituminous coal YAKUTUGOL have been measured at 4 particle sizes in the range of 0.4 - 1 ㎜. The ignition temperature of the particle increases with the raising of the diameter. The results were used to calculate the activation energy and the pre-exponential factor. As a result, the kinetics are in agreement with coal char kinetics from other investigations.
압력상승에 따른 아역청탄 촤의 점화온도에 관한 수치해석 및 실험적 연구
김량균(Ryang Gyoon Kim),권종서(Jong Seo Kwon),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
A coal char ignition temperature at elevated pressure is important particularly in understanding the fundamental phenomena for combustion zone of coal gasification. The ignition temperature of coal char particle is obtained by a direct measurement of the particle temperature with photo detector as well as by means of a solid thermocouple which is used as both a heating and a measuring element. The ignition temperatures for subbituminous coal wira of 0.8㎜ diameter have been measured at 4 different ambient pressures in the ranging from 1 to 15bar in constant volume chamber. The result shows that the coal char ignition temperature deceases with increasing ambient pressure due to an enhanced rate of heat generation. The numerical result is agreement with an experimental data.
공업로 적용을 위한 메탄-수소 혼소 시 NOx 배출 특성
임호,김태순,박영도,김량균,권종서,김규보 한국유체기계학회 2024 한국유체기계학회 논문집 Vol.27 No.1
This study investigated the NOx emission characteristics of methane-hydrogen co-combustion and hydrogen combustion. A multi-hole type flat flame (FF) burner was utilized as an industrial burner, and the tests were carried out with variations in air-fuel and co-firing ratio. The current investigation showed a minimum difference in the combustion and NOx-emission characteristics in the methane-hydrogen co-firing tests, at least up to 50% hydrogen co-combustion conditions. In the hydrogen combustion conditions, on the other hand, the amount of NOx emissions was significantly increased along with a flashback, which could produce additional heat to a burner surface. Additional tests with a greater amount of air showed that it is able to reduce the NOx emission level, and the heating of the burner surfaces as well.