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유동층에서 밀도가 다른 이성분 입자계의 flotsam의 유출

The Elutriation of Flotsam from Binary System with Different Density in a Fluidized Bed

장현태 차왕석 도동섭

Jang HT Cha WS Doh DS

HWAHAK KONGHAK, February 1996, 34(1), 64-69(6), NONE

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Abstract

밀도차이가 있는 이성분계를 대상으로 jetsam의 입도분포에 따른 flotsam입자의 유출특성을 연속식 유동층에서 고찰하였다. 본 실험에서 jetsam으로는 모래를 사용하였고, flotsam으로는 PMMA(poly methyl metacrylate)를 사용하였다. Jetsam의 입도분포에 따른 flotsam의 유출속도, 유출입자의 입도분포, 층내 압력요동특성치를 측정하였는데, flotsam입자의 비산 유출은 jetsam입자의 입도분포에 크게 영향을 받음을 알 수 있었으며 이러한 결과를 이용하여 jetsam의 입도분포를 조절하므로써 미세입자의 유출을 일부 제어할 수 있었다. Jetsam과 flotsam입자들의 입도분포에 따라 유동층의 유동화 특성이 크게 달라지며 이러한 유동화 특성을 압력요동 특성치인 표준편차로써 해석할 수 있었다.

The elutriation characteristics of flotsam for the size distribution of jetsam were investigated in continuous binary system with different density in a fluidized bed. In a fluidized bed of sand and PMMA(poly methyl metacrylate), sand was used as jetsam and PMMA as flotsam. Elutriation rate of flotsam, size distribution of elutriated particles and pressure fluctuations were measured for the size distribution of jetsam and elutriation rate of flotsam depended largely on the size distribution of jetsam. Using these results, it was found that elutriation of fine particles was partially reduced by controlling size distribution of jetsam. Fluidization characteristics were greatly influenced by the size distribution of jetsam and flotsam and these characteristics could be interpreted with standard deviation of pressure fluctuations.

Keywords

Fluidized Bed Elutriation Binary System Flotsam

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