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길상인(Sang-In Keel),박호영(Ho-Young Park),김영주(Young-Joo Kim),윤성환(Sung-Hwan Youn) 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Lots of Coal power plants (about 30) using bituminous coals are being run in Korea. The use of high volatile low grade sub-bituminous coal is increasingly extended because of imbalance between the worldwide coal supply and demand. Mill-fire has been an important issue since the use of such sub-bituminous coal. In existing coal plants of Korea, shutdown of coal and air supplies could be only a way, and an alternative has not been found in suppressing the mill fire. The inside fowfield in the mills has a highly fuel-rich, low temperature, and high velocity and non-reactive such that it could be a nonreactive system essentially. Nevertheless, occasional fire-occurrence could be attributed to the existence of an ignition source. However it has not been so far investigated in detail. The current work has a focus on suppressing the mile fire via some parametric experimental study such as effects of temperature, residence time, ignition source, and inert gas mixing. The results show that an small amount of CO2- or N2-mixing with air is very effective in suppressing fire formation even at high temperatures or flying sparks. The results suggest that exhaust gas recirculation into the mill should be an alternative to suppress mill fire.
길상인(Sang-In Keel),윤진한(Jin Han Yun),성홍근(Hong Gun Sung),전태병(Tae Byung Chun),정노택(Rho-Taek Jung),김선동(Seon Dong Kim),강창구(Chang Gu Kang) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
Considering the durability of FRP(Fiber Reinforced Plastic) vessels and the reduction of fishing boats in great quantities, development of waste FRP vessel treatment technique must be settled without a moment's delay. This experimental research is focused on the establishment of a basic design technique for the composition of a practical system. In the developed waste FRP vessel treatment system, the pre-treatment process composed of cutting and multi-step crushing, and melting process, which uses the heat energy of epoxy resin, were adopted in order to stabilize the glass fiber component. The resulting byproduct of direct melting is generally known as slag, which may be utilized as construction material such as brick, block, etc. Through the experimental setup and high temperature melting tests, this direct melting method is proved to be an environmental and economical method for the practical usage.
H₂-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO₂ 첨가 효과
길상인(Sang In Keel),박정(Jeong Park) 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Numerical study was conducted to clarify effects of added CO₂ for the downstream interaction between H₂-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having CO₂ addition into H₂-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of H₂, in which H₂-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route CO + O₂ → CO₂ + O with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including CO + OH → CO₂ + H with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added CO₂ suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added CO₂ was addressed to the present downstream interaction.
길상인(Sang In Keel),윤진한(Jin Han Yun),김석준(Seock Joon Kim),김우현(Woo Hyun Kim),이정규(Lee Jung Kyu),강창구(Chang Gu Kang),성홍근(Hong Gun Sung),정노택(Rho-Taek Jung) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
Marine debris incineration system was designed for the thermal treatment of contaminated wastes excepted in the recycle or resources. The design of this system was focused on the perfect gas cleaning including dioxin removal and the strengthening of furnace structure for the foundation on the barge mounted plate. Excellent performance data and the dioxin value of 0.06ng-TEQ/S㎥ mean that the improvement of ocean environment can expected. And also this system can play an important role in the problems of island's municipal waste treatment.
H<sub>2</sub>-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO<sub>2</sub> 첨가 효과
길상인,박정,Keel, Sang In,Park, Jeong 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Numerical study was conducted to clarify effects of added $CO_2$ for the downstream interaction between $H_2$-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having $CO_2$ addition into $H_2$-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of $H_2$, in which $H_2$-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route $CO+O_2{\rightarrow}CO_2+O$ with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including $CO+OH{\rightarrow}CO_2+H$ with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added $CO_2$ suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added $CO_2$ was addressed to the present downstream interaction.
수거된 해양패기물 자원화 기술 개발(I) - 해양패기물의 폐기물 연료화 -
길상인,윤진한,최연석,강창구,유정석,Keel Sang-In,Yun Jin-Han,Choi Yeon-Seok,Kang Chang-Gu,Yu Jeong-Seok 한국해양환경•에너지학회 2002 한국해양환경·에너지학회지 Vol.5 No.2
본 연구는 수거된 해양폐기물을 원료로 이용하여 폐기물연료(RDF : Refuse Derived Fuel)를 제조하는 공정 개발을 목적으로 하고 있으며, 산업용 연료로서의 활용 가능성을 확인하기 제조된 RDF의 물성분석을 분석하였다. 해양폐기물은 로우프에서의 납제거와 파쇄 그리고 해저 슬러지의 세척과 같은 전처리, 그리고 가연성분의 입자화 공정을 통하여 해양폐기물이 에너지로 변환하는 것이 가능하게 되었다. 이와 같은 해양폐기물 자원화 공정은 수거 폐기물의 환경적 처리는 물론 대체에너지 확보의 측면에서 매우 유익한 것으로 사료된다. The purpose of this study is the RDF process development for the disposal of marine debris, and physical properties of RDF was analyzed for the reliability as a industrial fuel. By the separation of lead from the waste rope and the pelletizing of burning material, marine debris changes to fuel resources. The resource recycling process is effective in the clean treatment of waste and the secure of substitute energy.
층류제트 부상화염에서 열손실에 의한 자기진동에 관한 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim),배대석(Dae Seok Bae),윤진한(Jin Han Yun),길상인(San in Keel) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.3
질소 희석된 프로판 부상화염에서 열손실에 의한 자기진동을 기초로 화염안정화선도를 도출하기 위하여 노즐직경 0.3 ㎜, 1.0 ㎜에서 실험적 연구를 수행하였다. 예혼합화염에서 확산화염으로의 전도 열손실에 의한 자기진동 및 매연 복사에 의한 자기진동을 관찰하였다. 0.1 ㎐보다 낮은 주파수 성향을 띄는 열손실에 의한 자기진동은 제안된 메커니즘에 의해 잘 묘사되었고 반면 매연복사에 의한 자기진동은 O(0.1 ㎐)의 주파수 범위를 나타내었으며 제안된 메커니즘은 항온항습실 실험을 통해 입증하였다. 질소 희석된 프로판 부상화염에서 관찰된 열손실에 의한 자기진동의 특성화는 관련된 변수 및 스트라훌 수에 의해 잘 묘사되었다. We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 ㎐ is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 ㎐. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.