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기체유동층에서 온도변화에 따른 고체입자의 비말동반특성
Effect of Temperature on Particle Entrainment in a Gas Fluidized Bed
HWAHAK KONGHAK, October 1995, 33(5), 580-589(10), NONE
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Abstract
전기로 가열되는 직경 0.1m, 높이 2.1m의 유동층에서 혼합입도(0-0.425mm)의 모래를 층물질로 사용하여 층온도의 변화에 따른 고체입자의 비말동반특성을 고찰하였다. 실험변수로는 입도(0.075-0.425mm), 기체유속(0.65-2.3m/s), 유동층온도(20-600℃)가 고려되었다. 입자비산속도에 대한 층온도의 영향은 유동화속도 0.8m/s이하에서는 온도가 증가함에 따라 아주 완만하게 증가하는 경향을 보였다. 유동화속도 1m/s이상에서는 온도가 증가함에 따라 감소하다가 최소값을 보인후 다시 증가하는 경향을 나타내었으며, 최소값의 위치는 유속이 증가함에 따라 더 높은 온도로 이동하였다. 이와 같은 경향은 유동화속도가 종말속도인 입경이 온도에 따라 변화화는 경향과 일치하였다.
The effect of temperature on 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(0.075-0.425mm). gas velocity(0.65-2.3m/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 0.8m/s. At the gas velocity greater than 1m/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.
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Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Butterworth-Heinemann, 95 (1991)
Wen CY, Yu YH, AIChE J., 12, 610 (1966)
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