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최연석(Choi, Yeon-Seok),최항석(Choi, Hang-Seok),김석준(Kim, Seock-Joon) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.1
The waste treatment fee and energy production effect of Wonju city RDF plant, the first RDF manufacturing plant in Korea, were investigated in the study. All plant operation data, like total weight of received wastes, produced RDF and separated rejects in processes were fully recorded for mass balance calculation of the plant in 2009. Also all consumed oil and electricity were recorded for energy balance calculation. The results showed that the waste treatment fee not including the RDF sales price of 25,000 won/ton-RDF was 116,573 won/ton-MSW and it went down to 105,298 won when included the RDF price. Produced RDF was 40.2% of total received waste in weight. Three components analysis by mass balance calculation of total received waste showed that Wonju city's MSW was 32.4% of combustible, 37.5% of water and 30.1% of incombustible respectively. Energy effect was found that total amount of produced energy was about 4 times more than that of consumed energy.
최연석(Choi, Yeon-Seok),최항석(Choi, Hang-Seok),김석준(Kim, Seock-Joon),윤균덕(Yoon, Kyoon-Duk) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The co-combustion of coal and three kinds of RDFs(Refuse Plastic Fuel) mixture has been experimented in a commercially operating CFB coal boiler respectively and the pollutant emissions such as SOx, NOx, TSP and dioxine were measured at the stack. The mixing ratio with coal was 7.5% RPF, 7.5% RDF and 10% SDF respectively. During co-combustion, dioxine emission level was very low and SOx, NOx and TSP were decreased comparing the single coal combustion. Emitting dioxine concentration was proportioned to the chlorine content of RDF. These RPF, SDF and RDF could be determined to be a good alternative fuel of general coal.
생물화공 에너지 / 환경 / 흡착성 유전체의 방전 플라즈마에 의한 톨루엔 분해에 관한 연구
최연석(Yeon Seok Choi),송영훈(Young Hoon Song),김석준(Seock Joon Kim),김부웅(Bu Ung Kim) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
Non-thermal plasma technologies were known to be effective for decomposition of dilute pollutant gases. In the present study the dielectric discharge plasma was examined in order to decompose toluene vapor, a kind of air pollutant VOCs. The dielectric barrier discharge plasma using the conventional AC as an electric power source was generated inside the tubular reactor in which the porous γ-Al₂O₃beads were packed. In order to investigate the adsorptive effect of the packed dielectrics the non-porous glass bead was also examined and compared with the γ-Al₂O₃for the abatement of toluene vapor. Experiments were carried out at the electric voltage of 16 ㎸ and 19 ㎸ and at the temperature of 25℃, 60℃ and 100℃ respectively. The kinetic velocity and activation energy of toluene decomposition reaction was studied in the γ-Al₂O₃beads packed reactor. The γ-Al₂O₃bead showed better performance for toluene decomposition than the glass bead. As the reactor temperature rising, the toluene decomposition rate also increased. Additionally the effect of dielectric constant of the packed dielectric was studied. The dielectric of higher dielectric constant showed better performance than that of lower one.
급속열분해를 통하여 생산된 바이오오일 액적의 증발 특성에 관한 수치해석적 연구
최상규 ( Sang Kyu Choi ),최연석 ( Yeon Seok Choi ),김석준 ( Seock Joon Kim ),한소영 ( So Young Han ) 한국공업화학회 2016 공업화학 Vol.27 No.6
바이오매스는 최근 화석연료의 고갈 및 지구온난화 등의 문제에 대응하기 위한 신재생에너지원으로 많은 관심을 받고 있다. 바이오오일은 폐목재, 농업 및 임업 부산물 등의 바이오매스로부터 급속열분해 과정을 통하여 생산되는 액체연료이다. 바이오오일은 일반적인 석유 계통의 연료에 비하여 점도가 매우 높고 고체상의 불순물을 포함하고 있어 버너 적용시 스프레이 분무 특성이 저하된다. 또한, 바이오오일은 셀룰로오스, 헤미셀룰로오스, 리그닌으로부터 유래되는 수백 종류의 화학종들로 이루어져 있어 일반적인 액체연료와는 액적의 증발 특성이 뚜렷하게 구분된다. 본 연구에서는, 바이오오일의 구성 성분을 아세트산, 레보글루코산, 페놀, 수분으로 단순화하여 액적의 증발 특성에 관한 수치해석적 연구를 수행하였다. 다양한 주위공기 온도, 액적의 초기 지름, 에탄올 혼합 비율에 대하여 액적의 증발 특성을 비교하였다. 주위공기 온도가 높아질수록 바이오오일 액적의 증발 시간은 짧아졌으며, 특히 낮은 온도 범위에서는 증발 시간이 공기온도에 매우 민감하였다. 또한 액적의 지름이 감소할수록, 에탄올 혼합 비율이 증가할수록 증발 시간이 단축됨을 알 수 있었다. Biomass is regarded as one of the promising energy sources to deal with the depletion of fossil fuels and the global warming issue. Biocrude-oil can be produced through the fast pyrolysis of biomass feedstocks such as wood, crops, agricultural and forestry residues. It has significantly higher viscosity than that of conventional petroleum fuel and contains solid residues, which can lower the spray and atomization characteristics when applied to the burner. In addition, biocrude-oil consists of hundreds of chemical species derived from cellulose, hemicellulose and lignin, and evaporation characteristics of the bio-crude- oil droplet are distinct from the conventional fuels. In the present study, a numerical study was performed to investigate the evaporation characteristics of biocrude-oil droplet using a simplified composition of the model biocrude-oil which consists of acetic acid, levoglucosan, phenol, and water. The evaporation characteristics of droplets were compared at various surround-ing air temperatures, initial droplet diameters, and ethanol mixing ratios. The evaporation time becomes shorter with increasing air temperature, and it is much sensitive to the air temperature particularly in low temperature ranges. It was also found that the biocrude-oil droplet evaporates faster in cases of the smaller initial droplet diameter and larger ethanol mixing ratio.