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압력강하를 이용한 밀도차가 있는 이성분계의 혼합도 예측
Prediction of Mixing Degree of Binary System with Different Density in a Fluidized Bed
HWAHAK KONGHAK, February 1998, 36(1), 98-104(7), NONE
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Abstract
내경 0.109m인 유동층반응기에서 이성분계에 대한 혼합특성을 연구하였다. 대상물질로는 모래, PMMA(poly methyl methacrylate)와 망간 광석을 이용하여 혼합도와 압력강하곡선의 특성을 jetsam rich계와 flotsam rich계에 대하여 각각 수행하였다. 압력강하곡선을 이용하여 혼합과 분리현상의 측정과 해석을 하였으며 이러한 결과는 체분석을 통한 혼합도를 이용하여 규명하였다. 본 연구로부터 다음의 결과를 얻을 수 있었다. 유속에 따른 축방향 혼합도는 층내의 압력강하 변화와 관계되며, take-over velocity는 압력강하곡선 기울기의 전이점으로부터 구할 수 있음을 알았다.
The profile of pressure difference and mixing degree were investigated with binary system of different density using PMMA(poly methyl methacrylate) and sand(or manganese ore) in a 0.109 m I.D. gas fluidized bed. This study is carried out the systems jetsam rich system and flotsam rich system. A study on mixing-segregation phenomena was performed by the analysis of the profile of pressure difference, and the results were confirmed with mixing degree using sieve test. It was found that the take-over velocity was obtained from the value of specific gas-velocity which observed by transition of the slope in a pressure differences profile. The mixing degree is related with variation of the bed pressure difference measuring height of axial position according to gas velocity.
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Chiba S, Powder Technol., 26, 1 (1980)
Cheung L, Nienow AW, Rowe PN, Chem. Eng. Sci., 29, 1031 (1974)
Cooper GR, mcGillem CD, "Probabilistic Methods of Signals and System Analysis," Holt, Rinehart and Winston Inc. (1971)
Lofstrand H, Almstedt AE, Andersson S, Chem. Eng. Sci., 50(2), 245 (1995)
Campos JBLM, Guedes de Carvalho JRF, Chem. Eng. Sci., 47, 4057 (1992)
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Naor P, Shinar R, Ind. Eng. Chem. Fundam., 2, 278 (1963)
