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역청탄과 아역청탄 혼합연소조건에서 혼소율이 순산소 연소특성에 미치는 영향
성연모(Yonmo Sung),문철언(Cheoreon Moon),안성율(Seongyool Ahn),안재우(Jaewoo An),나종문(Jongmoon Na),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study focuses on the combustion characteristics of blended coals with bituminous and sub-bituminous coals under air and oxy-fuel combustion conditions. The effects of oxygen concentration and blending ratio on the combustion characteristics were experimentally investigated using a thermogravimetric analyser(TGA). Characteristic temperatures including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. As oxygen concentration increased and the presence of sub-bituminous coal, characteristic temperatures and activation energy decreased. The ignitability, reactivity and kinetics have all been greatly improved under oxy-fuel combustion conditions. Based on this, co-firing with bituminous and sub-bituminous coals under oxy-fuel combustion conditions may be suggested as an alternative method to the fuel flexibility and cost-effective power production with carbon capture and sequestration.
미분탄 스월버너에서 PKS와 석탄 혼소가 화염 구조에 미치는 영향
신민호(Minho Shin),성연모(Yonmo Sung),최민성(Minsung Choi),이광수(Gwangsu Lee),최경민(Minsung Choi),김덕줄(Duckjool Kim) 한국연소학회 2016 한국연소학회지 Vol.21 No.4
Flame structure of co-firing coal and palm kernel shell (PKS) was investigated in a pulverized coal swirl burner by particle image velocimetry (PIV). The pulverized coal swirl flame is operated with a PKS blending ratio of 10%, 20%, and 30%. For all operating conditions, flame structures such as internal recirculation zone (IRZ), outer recirculation zone (ORZ), and exhaust tube vortex (ETV) were observed. In the center of flame, the strong velocity gradient is occurred at the stagnation point where the volatile gas combustion actively takes place and the acceleration is increased with higher PKS blending ratio. OH radical shows the burned gas region at the stagnation point and shear layer between IRZ and ORZ. In addition, OH radical intensity increases for a co-firing condition because of high volatile matter from PKS. Because the volatile gas combustion takes place at lower temperature, co-firing condition (more than 20%) leads to oxygen deficiency and reduces the combustibility of coal particle near the burner. Therefore, increasing PKS blending ratio leads to higher OH radical intensity and lower temperature.
미분탄 이중 스월화염에서 스월강도 및 석탄 입경 변화 영향 연구
최민성(Minsung Choi),성연모(Yonmo Sung),이상민(Sangmin Lee),문철언(Cheoreon Moon),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
The present work focuses on the analysis of the pulverized coal combustion aerodynamics of the dual swirl burner by the control of the swirl-modes such as the outer swirl intensity (OSI). The detailed structure of pulverized coal swirling flames with swirl-mode was studied experimentally by particle image velocimetry and local flame colors based on OH<SUP>*</SUP>, CH<SUP>*</SUP>, and C₂<SUP>*</SUP> radicals. For all co-swirling conditions, the internal recirculation zone (IRZ) was observed near the inner shear layer with respect to the processing vortex core structure. Furthermore, a co-rotating vortex in the outer shear layer and the exhaust tube vortex (ETV) along the central axis were observed. The intensity of CH<SUP>*</SUP> signal was higher with small coal particle size, conversely, the size of the distribution of the CH<SUP>*</SUP> signal becomes larger. Therefore, the control of the aerodynamics with changing swirl intensities may play an important role in improving both environmental and combustion performances.
장병화(Byunghwa Jang),성연모(Yonmo Sung),오창용(Changyong Oh),김승태(Seungtae Kim),전유택(Yootaek Jeon) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Oscillating combustion characteristics was experimentally investigated to reduce NOx emissions and improve thermal efficiency in a 1MWth industrial burner for reheating furnaces. Natural gas was used as fuel. This study was carried out for a range of oscillating frequencies(1~5 Hz) and duty ratios(10%~40%). Furnace temperature and gas species concentrations were measured for with- and without oscillating flames. The NOx reduction efficiency for flames with oscillating combustion in comparison to flames without oscillating combustion increases with decreasing oscillating frequency and increasing duty ratio. The maximum NOx reduction efficiency was 32% in 1 Hz-40% oscillating flames. For the temperature measured at the furnace top-wall, the maximum temperature with oscillating flames was reduced at main flame regions, however, the overall temperature after main flame regions is higher than that of the flames without oscillating combustion.
15kW급 미분탄 연소로내에서 바이오매스 혼소율 변화에 따른 연소 특성 비교
이상민(Sangmin Lee),성연모(Yonmo Sung),최민성(Minsung Choi),문철언(Cheoreon Moon),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
This study focused on the effect of the biomass blended ratio on air-staged pulverized coal furnace. The hybrid NOx reduction technology between fuel blending and air staging has been applied in an air-staged pulverized coal fired furnace. The results indicated that co-firing biomass with coal could reduce NOx emissions in an air-staged combustion. In addition, carbon burnout and flame temperature increased under the air-staged condition. A dominant synergistic effect on NOx reduction and carbon burnout was observed when biomass co-firing with coal was applied in air staged combustion.
산업용 버너에서의 LNG, LPG/Air 연소특성 비교연구
오창용(Changyong OH),성연모(Yonmo SUNG),김승태(Seungtae KIM),유승우 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The influence of gaseous fuel type and load on flame characteristics was experimentally investigated in a 1.3 MWth reheating furnace burner. In this study, LNG, LPG, and LPG/Air were selected as fuel, and fuel loads were set to 15%, 30%, and 60% in order to study gas interchangeability. The experimental results showed that the fuel change shows minor effect on the flame appearance for different fuel load conditions. The flame straightness performance was degraded under 30% fuel load conditions. The flame straightness performance was improved by injection of the burner center air. Minimum 10% air was required to improve the flame straightness performance compared to without burner center air conditions.
문철언(Cheoreon Moon),성연모(Yonmo Sung),안성율(Seongyool Ahn),김태경(Taekyung Kim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.44
In this study, the thermal behavior and combustion characteristics of different ranks of coals and their blends were investigated to obtain information necessary for the evaluation of the co-processing of blends with low-rank coals. Thermogravimetric analysis(TGA) and differential thermal analysis(DTA) were carried out at different temperature from ambient temperature to 800℃, and a laboratory-scale pulverized coal combustion burner was used with coal feeing rate of 1.04×10<SUP>-4</SUP> kg/s.