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순환유동층에서 입자의 크기변화에 따른 츰밀도의 변화특성
The Effect of Particle Size on the Suspension Density in a Circulating Fluidized Bed
HWAHAK KONGHAK, December 1996, 34(6), 735-741(7), NONE
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Abstract
순환유동층의 조업에 중요한 영향을 미치는 고체입자의 농도분포에 대한 고체입자 크기의 영향을 살펴보았다. 본 연구에 사용된 순환유동층은 직경 50 mm, 높이 2500mm였다. 사용된 입자는 크기가 다른 모래였으며 각각의 평균 직경은 147, 280㎛이었다. 기체의 유속범위는 3-5.5 m/s, 입자순환량은 10-100kg/㎡.s이었으며 이때 압력강하로부터 측정된 suspension density는 10-80kg/㎥, 입자의 크기변화 및 기체유 속의 변화에 따른 고체입자의 국부적 그리고 평균 농도분포의 변화를 관찰할 수 있었으며, 순환유동층의 조업변수들로부터 평균 입자농도를 예측할 수 있는 상관관계식을 제시하였다.
An experimental investigation was carried out to determine the effect of particle size and gas velocity on the suspension density in a circulating fluidized bed. The experimental test section has the dimension of 50 mm ID X 2500mm height and two different sizes of sand(147,280㎛) were employed as the bed material. The operating conditions of gas velocity and solid circulation rate were in the ranges of 3.0-5.5 m/s and 10-100kg/㎡·s, repectively and the corresponding on the suspension density with different size of sand particle was observed. A correlation was proposed to predict the crosssectional averaged suspension density with the operating variables.
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