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최정후,최광배,김병채,선도원,김상돈 ( Jeong Hoo Choi,Kwang Bae Choi,Peter Kim,Do Won Shun,Sang Done Kim ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.5
The effect of temperature en the particle entrainment rate was measured and discussed in a gas fluidized bed(0.1m in diameter, 2.1m high) which used sand as a bed material and was equipped with an electric heater. The particle size(0.075-0.425㎜), gas velocity(0.65-2.3 m/s) and bed temperature(20-600℃) were varied as experimental variables. The particle entrainment rate increased very slowly with the bed temperature at the gas velocity less than 0.8 m/s. At the gas velocity greater than 1 m/s, the particle entrainment rate decreased with increasing the bed temperature until a certain temperature above which the particle entrainment rate increased with the bed temperature. The minimum point of particle entrainment rate shifted to higher temperature with increasing gas velocity. The change of the particle entrainment rate along the bed temperature was same as that of the particle size whose terminal velocity was equal to the gas velocity.
최정후,김규종,김병채 ( Jeong Hoo Choi,Kyu Jong Kim,Peter Kim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
The particle entrainment rate was measured and discussed in a cold model fluidized bed(0.1 m-ID, 2.4 m-height) which employed a secondary air injection at a height of 0.2 m above the distributor plate. Sand particles of mixed sizes under 0.5 ㎜ in screen size were used as bed materials. The particle size(0.128-0.363 ㎜), the overall superficial gas velocity(0.76-2.77 m/s), the secondary air fraction(0-0.5), and the static bed height(0.1-0.3 m) were considered as experimental variables. The entrainment rate increased with the gas velocity, but with a decrease of particle size. The effect of static bed height was negligible. The entrainment rate decreased with an increase of the proportion of secondary air. The effect of secondary air fraction was appreciable for over-bed injection and was reduced as the location of second gas inlet moved toward in-bed.
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)
Geldart 분류 A , B , D 입자의 기체유동층에서 기포크기에 관한 통일된 상관식
최정후 ( Jeong Hoo Choi ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.2
A unified correlation on the bubble size which considered coalescence and splitting of bubbles has been derived in gas fluidized beds of Geldart group A, B and D particles. In addition, correlations has been proposed to describe respectively the bubble flow fraction of the excess gas flow rate A(U-U_(mf)), the splitting frequency of the single bubble and the equilibrium bubble diameter on the condition that the coalescing rate is equal to the splitting rate in bubbles. The proposed correlation on the bubble diameter agreed satisfactorily to the data reported in the literature.
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.