Articles & Issues

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

All issues

기체유동층에서 최소슬러깅속도

Minimum Slugging Velocity in a Gas Fluidized Beds

류호정 최정후 이창근 선도원 손재익 감상돈

Ryu HJ Choi JH Yi CK Shun DW Son JE Kim SD

HWAHAK KONGHAK, June 1999, 37(3), 472-481(10), NONE

Download PDF

Abstract

기체유동층(직경 0.1 m, 높이 2.5m)에서 층물질로 모래(평균입경:0.286mm, 입자밀도:2,561kg1m3)를 사용하여 분산판으로부터의 높이(0.36, 0.46, 0.83, 0.93m)와 최소유동화상태의 층높이(0.85, 0.95, 1.05, 1.15, 1.25m) 변화에 따른 최소 슬러깅속도의 변화를 측정 및 고찰하였다. 최소슬러깅속도는 분산판으로부터의 높이가 증가함에 따라 감소하였으며 최소 유동화상태의 층높이가 증가함에 따라 증가하였다. 기포크기에 관한 기존의 상관식을 이용하여 최소슬러깅속도에 관한 모델을 제시하였다. 본 연구에서 제시된 최소슬러깅속도에 관한 모델은 본 연구 및 문헌의 실험결과들과 만족스러운 일치를 보였으며 장치직경, 입자특성 및 분산판으로부터의 높이변화에 따른 최소슬러깅속도의 변화경향을 예측할 수 있었다.

Effects of height from the distributor plate and bed height at minimum fluidization on the minimum slugging velocity have been investigated in a gas fluidized bed(0.1 m i.d. and 2.5 m height) using sand(mean diameter : 0.286 mm, apparent density : 2,561 kg/m³) as bed material. Minimum slugging velocity decreased with increasing height from the distributor plate, however, increased with increasing bed height at minimum fluidization. A model has been proposed to predict the minimum slugging velocity based on bubble size correlation. The proposed model can predict the present and previous experimental results reasonably well.

Keywords

Gas Fluidization Minimum Slugging Velocity Model Flow Regime Map

References

Davidson JF, Clift R, Harrison D, "Fluidization," Chapter 3, 2nd ed., Academic Press, London, 122 (1985)
Stewart PSB, Davidson JF, Powder Technol., 1, 61 (1967)
Baeyens J, Geldart D, Chem. Eng. Sci., 29, 255 (1974)
Broadhurst TE, Becker HA, AIChE J., 21(2), 238 (1975)
Ho TH, Yutani N, Fan LT, Walawender WP, Powder Technol., 35, 249 (1983)
Agarwal PK, 2nd Int. Symp. on Gas-Solid Flows, Atlanta, May 12-16, 1 (1986)
De Luca L, Di Felice R, Foscolo PU, Powder Technol., 69, 171 (1992)
Matheson GL, Herbst WA, Holt PH, Ind. Eng. Chem., 41, 1099 (1949)
Dimattia DG, Amyotte PR, Hamdullahpur F, Can. J. Chem. Eng., 75(2), 452 (1997)
Gerald D, Chem. Eng. Prog., 47, 483 (1951)
Leva M, Weintraub M, Grummer M, Pollchik M, Storch HH, U.S. Bureau of Mines Mulletin, 504 (1951)
Lanneau KP, Trans. Instn. Chem. Eng., 38, 125 (1960)
Fatah N, Flamant G, "Fluidization and Fluid Particle Systems," Casal, J. and Arnaldos, J. eds., Universitat Politecnica de Cataluya, Spain, 103 (1990)
Ergun S, Chem. Eng. Prog., 48, 89 (1952)
Lee GS, Kim SD, Powder Technol., 62, 207 (1990)
Wen CY, Yu YH, AIChE J., 12, 610 (1966)
Cranfield RR, Geldart D, Chem. Eng. Sci., 29, 935 (1974)
Choi JH, Son JE, Kim SD, Ind. Eng. Chem. Res., 37(6), 2559 (1998)
Geldart D, "Gas Fluidization Technology," John Wiley and Sons, Chichester, 88 (1986)
San Jose MJ, Olazar M, Benito PL, Bilbao J, Inst. Chem. Eng., 73, 473 (1995)
Choi JH, Chang IY, Shun DW, Yi CK, Son JE, Kim SD, Proceedings of the 6th Asian Conference on Fluidized-Bed and Three-Phase Reactors, Chun, H.S. and Kim, S.D. eds, 31-36 (1998)
Bi H, Fan LS, AIChE J., 38(2), 297 (1992)
Ryu HJ, Choi JH, Theor. Appl. Chem. Eng., 3, 1065 (1997)
Kunii D, Levenspiel O, "Fluidization Engineering," 1st ed., John Wiley and Sons (1969)