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Isworo, Yanuar Yudhi(이스워로 야누아르 유디),Jeon, Chung Hwan(전충환) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
Thermogravimetric characteristics of some typical coal representing low-high rank coal and include upgraded coal were investigated using a thermogravimetric analyzer under heating rate of 10°C/min to 850°C in air condition. The coal samples were representing low, medium, and high rank coal and include also upgraded coal (ash free coal). Result obtained from this investigation indicated thatcoal rank which is based on calorific value could not be referred as only parameter to judge coal reactivity in term of coal as power generation, and low-rank coal has showed that it could has better reactivity than higher rank coal in tenn of initial temperature. Future research should be conducted to detail other factors in term of coal structure before, during, and after being combusted as parameters caused better performance in coal utilization area.
반탄화 과정이 바이오매스 연료의 구조 및 연소성에 미치는 영향
정종원,김경민,야누아르 유디 이스워로,전충환,JEONG, JONG-WON,KIM, GYEONG-MIN,ISWORO, YANUAR YUDHI,JEON, CHUNG-HWAN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.3
Torrefaction is one of the methods to increase combustion calorific value and hydrophobicity of biomass. In this study, the effects of torrefaction on devolatilization, char reactivity and biomass structure were analyzed. Empty fruit bunch (EFB) and Kenaf biomass were used as fuels to be torrefied in the N2 environment at 200, 250 and $290^{\circ}C$. Devolatilization and char kinetics were analyzed by using TGA and biomass structure was investigated through petrography image. The reactivity showed different trends depending on the torrefaction temperature and biomass structure. The herbaceous biomass, Kenaf, was shown as high reactivity and thin wall structure. On the contrary, the woody biomass, EFB, had relatively low reactivity and thick wall structure.
Petrography 분석을 통한 고휘발 역청탄의 연소율 예측
이지환(Ji-Hwan Lee),이대균(Dae-Gyun Lee),야누아르 유디 이스워로(Yanuar Yudhi Isworo),전충환(Chung-Hwan Jeon) 한국연소학회 2021 한국연소학회지 Vol.26 No.1
The purpose of this study is to predict the combustion rate of high-volatile bituminous coal which is one of the important factors in determining the combustion conditions of a power plant. A method of predicting the combustion rate was proposed by integrating the petrography analysis elements related to the combustion rate. Since inertinite had a major effect on the combustion rate, it was possible to predict the combustion rate basically through the inertinite fraction, and petrofactor A was proposed by considering the Vitrinite reflectance value, and more accurate prediction was possible. Petrofactors B and C were proposed by additionally considering the standard deviation of vitrinite reflectance and the effect of liptinite to petrofactor A. The combustion rate could be more accurately predicted. Finally, petrofactor D was proposed considering all the previous factors, and the combustion rate was most accurately predicted.