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A Study on Combustion Characteristics of wood pellets
심봉석(Sim, Bong Seok),김혁주(Kim, Hyouck Ju),박화춘(Park, Hwa Choon),김종진(Kim, Jong Jin),최규성(Choi, Kyu Sung),강새별(Kang, Sae Byul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
We investigated combustion characteristics of wood pellets in a combustion equipment with adjusting amount of flue gas. Maximum temperature in a combustion chamber was 850?C. Higher heating Value of a domestic wood pellet tested is 19.1 MJ/kg and water content was 8.3%. Amount of flue gas causes big effect on burning characteristics in 450{sim}600?C. Wood pellet does not burn in low temperature atmosphere less than 450?C and low flue gas flow rate. We made burning the pellet that is made in Korea, USA, Chile and Canada. Color of foreign pellets are bright brown and they made by mainly sawdust. Korean pellet is a dark brown color because it contains bark. There are some differences in the result of elementary analysis and technical analysis. According to the result of burning experiment, burning times of each countries's pellet are similar.
심봉석(Bong Seok Sim),김혁주(Hyouck Ju Kim),박화춘(Hwa Choon Park),김종진(Jong Jin Kim),최규성(Kyu Sung Choi),강새별(Sae Byul Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
We investigated a combustion characteristics of wood pellet in a combustion test equipment that can burn a single wood pellet. The test equipment can supply flue gas with constant temperature up to 850 ℃ and can control O2 concentration. The higher heating value of the wood pellet (dry base) is 19.1 MJ/㎏ (4 550 ㎉/㎏) and water content as received is 8.28 %. The results show that there are 3 modes of wood pellet combustion, 1) Gasification (including pyrolysis), 2) Flame burning and 3) Charcoal burning. We measured the time duration of each mode. In order to shorten the ignition time, the duration time of gasification (mode 1) should be reduced. The minimum temperature for ignition of a wood pellet is 500 ℃. The mass reduction rate was measured. During gasification mode (mode 1), the mass reduction is about 20 ~ 30 %. The mass reduction during flame combustion is about 55 ~ 70 %.
수치해석을 이용한 목재펠릿 보일러 내부의 가이드베인 최적화 연구
심봉석(Bong Seok Sim),김종진(Jong Jin Kim),최규성(Kyu Sung Choi),오홍영(Hong Young OH),장준환(Jun Hwan Jang),강새별(Sae Byul Kang) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
We investigated guide vane Optimization of the Wood pellet boiler using Numerical Analysis. Wood combustion is a complex process. It involves many physical and chemical processes. Burning phases of wood pellet can be classified into three modes, 1) gasification mode, 2) flame burning mode and 3) charcoal burning mode. The test equipment used moving grate combustor. Primary air is supplied from the bottom of the grate and the flame is formed above moving grate. The flame is formed longer than gas or oil flame. Therefore Flames burning very close to a cold wall may be partially quenched by heat conductivity to the wall. Considering the length of the flame, the two chambers are developed. The flame in the 1st combustion chamber is moved to the second combustion chamber along the guide vane. The result of guide vane influence on the internal flow structure is analyzed from the velocity profiles and the vector plot.
목재펠릿보일러의 FGR을 이용한 NOx 저감 방법 연구
심봉석(Bong Seok Sim),김종진(Jong Jin Kim),최규성(Kyu Sung Choi),강새별(Sae Byul Kang),장준환(Jun hwan Jang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The developments of clean and renewable energy sources are needed in order to reduce dependency of fossil fuel and global warming. Wood pellet is one of clean renewable energy sources and has been considered as one of the substitutes for fossil fuels. Wood combustion is a complex process. It involves many physical and chemical processes. Burning phases of wood pellet can be classified into three modes, 1) gasification mode, 2) flame burning mode and 3) charcoal burning mode. In this study, the characteristics of NOx(nitrogen oxides) reduction of wood pellet boiler was investigated by using flue gas recirculation, that is FGR.
Bong-Seok Song,Seung-Bin Yoon,Ji-Su Kim,Bo-Woong Sim,Young-Hyun Kim,Jae-Jin Cha,Seon-A Choi,Sun-Uk Kim,Kyu-Tae Chang 한국동물번식학회 2012 Reproductive & Developmental Biology(Supplement) Vol.36 No.2s
The coupling of autophagy and endoplasmic reticulum (ER) stress has been implicated in a variety of biological processes. However, little is known regarding the involvement of the autophagy/ER stress pathway in early embryogenesis or the underlying mechanism (s). Here, we showed that the developmental competence of in vitro-produced (IVP) bovine embryos was highly dependent on the autophagy/ER stress balance. Although relative abundances of autophagy-associated gene transcripts, including LC3, Atg5, and Atg7 transcripts, were high in oocytes and throughout the early stages of preattachment development, extensive autophagosome formation was only detected in fertilized embryos. Using inducer and inhibitor of autophagy, we showed that transient elevation of autophagic activity during early preattachment development greatly increased the blastocyst development rate, trophectoderm cell numbers, and blastomere survival; these same parameters were reduced by both inhibition and prolonged induction of autophagy. Interestingly, the induction of autophagy reduced ER stress and associated damage, while the developmental defects in autophagy-inhibited embryos were significantly alleviated by ER stress inhibitor treatment, indicating that autophagy is a negative regulator of ER stress inearly embryos. Collectively, these results suggest that early embryo genesis of IVP bovine embryos depends on an appropriate balance between autophagy and ER stress. These findings may increase our understanding of important early developmental events by providing compelling evidence concerning the tight association between autophagy and ER stress, and may contribute to the development of strategies for the production of IVP bovine blastocysts with high developmental competence.