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석탄(石炭)의 유동층(流動層) 연소(燃燒)에 관(關)한 S. ENDRENYI와 B. PALANCZ의 수학적(數學的) 수정(修正)모델(비표면적(比表面積) 변화(變化)의 영향(影響))
김명준,이관석,서정윤,Kim, M.J.,Rhee, K.S.,Seo, J.Y. 대한설비공학회 1988 설비저널 Vol.17 No.1
A numerical analysis of the mathematical model for fluidized bed coal combustion has been performed. Based on the physical nature of the specific surface variation due to the decreasing of coal particle diameter according to the combustion process, the modified model which has been added the specific surface variation to the S.ENDRENYI and B.PALANCZ's mathematical model was established in this study. From the numerical analysis of these two models, it was found that the perfect combustion time is increasing largely at least 5 seconds in the modified model in comparison with that of the S.ENDRENYI and B.PALANCZ's model, and the bed temperature and the coal particle surface temperature during the main combustion period represent constant with time in the S.ENDRENYI and B.PALANCZ's model, on the other hand, these properties are decreasing linearly with time in the modified model.
국산(國産) 저질무연탄(低質無煙炭) 연소용(燃燒用) 유동층(流動層) 연소로(燃燒爐) 개발(開發) 및 열효율(熱效率) 증대(增大)에 관한 연구(硏究)
이관석,Rhee, K.S. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.2
Characteristics of heat transfer in a smooth and finned tube located vertically in atmospheric fluidized bed combustor which uses low grade anthracite coals was studied. Experiments to investigate the characteristics of heat transfer between smooth and finned tube are carried out and the results depend on particle size, fluidizing air velocity and bed temperature are summarized. It is found that heat transfer coefficient of the smooth and finned tube increases with decrease in particle diameter and increase in bed temperature. Furthermore, it is noted that heat transfer coefficient increase at the first with increase in the velocity of fluidizing air and tends to decrease at a certain fluidizing air velocity. The increase of heat transfer coefficient for the finned tube is appeared to be increased in 30% compared to that for the smooth tube.
진공침탄과 가스침탄에 의한 SCM415강의 경도 및 변형특성
박상준 ( S. J. Park ),이관석 ( K. S. Rhee ),김경식 ( K. S. Kim ) 한국열처리공학회 2002 熱處理工學會誌 Vol.15 No.6
N/A For the investigation of the hardness profiles and distortion characteristics of SCM415 steel, test pieces of SCM415 steel were gas and vacuum carburizing treated. The hardness profiles and distortion characteristics of vacuum and gas carburized SCM415 steel show different results. Vacuum carburizing can offer more improved hardness profiles than alternate methods of carburizing. Compared to altemate methods of carburizing, vacuum carburizing can offer improved mechanical properties and reduced cycle times of the process.
Pt, Pd와 Ph가 담지된 촉매상에서 암모니아와 수소/일산화탄소의 단계별 촉매연소에 관한 연구
황주연(J. Y. Hwang),유인수(I.S. Ryu),이규철(K. C. Lee),이승재(S.J. Lee),노동순(D. S. Noh),이관석(K. S. Rhee),강성규(S.K. Kang) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
본 연구는 Fuel-Nox 제어를 위한 암모니아 중 질소성분의 전환반응에 대한 실험 결과이다. 특히 열분해가스 촉매연소에서 NOx 생성을 줄이기 위한 제어 조건을 제시하였으며, Fuel-NOx 반응 메카니즘 연구의 기초자료를 제시하였다. This study investigated on the conversion of nitrogen component in ammonia gas to control fuel-NOx. Control conditions were found to suppress the production of NOx in the catalytic combustion of the gasified fuels. Also, the results would provide the basis of the theoretical study on fuel-NOx generation mechanism.
2차원(次元) 충돌분류(衝突噴流)의 열전달(熱傳達) 증진(增進)에 관(關)한 실험적(實驗的) 연구(硏究) (사각(四角) Rib폭(幅)의 효과(效果))
이용화,이관석,서정윤,Lee, Y.H.,Rhee, K.S.,Seo, J.Y. 대한설비공학회 1988 설비저널 Vol.17 No.4
The impinging air jet system is still being used in the various fields with its inherent merits, that is, the easiness in engineering application and high heat transfer coefficients at stagnation point. The purpose of this study is augmentation of heat transfer without additional power in the rectangular air jet which impinges vertically to the heating surface. As a method of passive heat transfer augmentation in a two-Dimensional impinging jet, the transverse-repeated surface roughness of square cross-section is used. This paper deals with the experimental study on the characteristics of heat transfer at the x-direction in between nozzle exit and heating surface of flat plate, and that of ribbed plate. And this study also investigates the effect of square rib widths. The integral average heat transfer coefficient of ribbed plate is about 2.2 times larger than that of flat plate.