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분체공학 , 유동층 , 고분자 , 재료 ( 무기 , 유기 ) : 기체유동층에서 슬러그 특성 ; 2. 슬러그 길이와 슬러그 상승속도
손재익(Jae Ek Son),김상돈(Sang Done Kim),최정후(Jeong Hoo Choi),류호정(Ho Jung Ryu) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.5
The effects of gas velocity, height from the distributor plate, bed height at minimum fluidization, column diameter and particle properties on vertical slug length and slug rising velocity were measured and discussed. The vertical slug length increased with increasing the gas velocity, height from the distributor plate and bed height at minimum fluidization, however, decreased with an increase of column diameter. The slug rising velocity also increased with increasing gas velocity, height from the distributor plate and bed height at minimum fluidization. The slug rising velocity increased slightly with column diameter. The vertical slug length and the slug rising velocity of sand were higher than that of FCC at the same excess gas velocity.
분체공학 유동층 재료 ( 무기 , 유기 , 고분자 ) / 고온고압건식 유동층 탈황공정의 고체흐름특성 해석
최정후(Jeong Hoo Choi),이창근(Chang Keun Yi),손재익(Jae Ek Son),김상돈(Sang Done Kim) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.5
A particle population balance has been developed to analyze characteristics concerning solid flow rates of input and output streams and their particle size distributions in a fluidized bed high pressure hot-gas desulfurization process of the IGCC system that consists of a desulfurizer and a regenerator. Simulation on the solid flow rate and its particle size distribution has been carried out with variations of principal process parameters such as the attrition rate constant of sorbent, cut diameter of the cyclone, bed weight and gas velocity in the desulfurizer and the cut diameter of the cyclone in the regenerator. As the attrition rate constant of sorbent, the bed weight and gas velocity of the desulfurizer increased, the feed rate of fresh sorbent and the flow rate of solid from the regenerator to the desulfurizer were predicted to increase. As cut diameters of desulfurizer and regenerator cyclones increased, the feed rate of fresh sorbent were predicted to increase, however, the flow rate of solid from the regenerator to the desulfurizer were predicted to decrease. The most important factor affecting solid flow rates of input and output streams and their particle size distributions was found to be the cut diameter of the desulfurizer cyclone. Effects of the attrition rate constant of sorbent, gas velocity and bed weight in the desulfurizer on the feed rate of fresh sorbent were predicted somewhat important because they affect the particle attrition rate. Particle size distributions of the process were influenced mainly by the collection efficiency of the desulfurizer cyclone, however, effects of other parameters were negligible. The gas velocity in the desulfurizer was found the most important parameter for load control and the effect of the collection efficiency of the desulfurizer cyclone on load control was moderate.
기체유동층의 스플래쉬 영역에서 축방향 고체체류량 분포의 감쇄상수에 대한 온도의 영향
최정후(Jeong Hoo Choi),마상찬(Sang Chan Ma),선도원(Do Won Shun),손재익(Jae Ek Son),김상돈(Sang Done Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
Effects of temperature(24-600℃) and gas velocity(0.5-2.0 m/s) on the decay constant of axial solid holdup profile of the splash region have been measured in a gas fluidized bed(0.1 m-i.d., 2.1 m height) equipped with an electric heater. Sand was used as a bed material. The decay constant of axial solid holdup profile in the splash region decreased with an increase of the gas velocity. As the temperature increased, the effect of the gas velocity decreased slightly. The decay constant increased with the temperature at a certain gas velocity. The effect of the temperature on the decay constant increased us the gas velocity increased. Based on results of this study and previous studies, a correlation on the decay constant that considers the effect of temperature was proposed as follows: (수식)