Articles & Issues

Language: English

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

Publication history: Received June 12, 2003
Accepted July 28, 2003

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

Dynamic Characteristics of Bed Collapse in Three-Phase Fluidized Beds

Dong Hyun Lee^† Sung Soo Park Won Woong Choi Duk Joon Kim Ji-Heung Kim Young Kwan Lee Sang Jun Sim Sang Done Kim¹

Department of Chemical Engineering, SungKyunKwan University, Suwon 440-746, Korea ¹Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

dhlee@skku.edu

Korean Journal of Chemical Engineering, November 2003, 20(6), 1166-1169(4), 10.1007/BF02706956

Download PDF

Abstract

Transient behavior of the bed collapse after shut-off the gas supply into a three-phase fluidized bed was determined. Experiments were carried out in a 210-mm diameter half-tube acrylic column having a 1.8 m-high test section. The polymer beads (d_p=3.2 mm, r_s=1,280 kg/m³) were fluidized by cocurrent flow of deionized water and air. The transient behavior of the bed collapse after cut-off the gas supply to the bed was monitored by a video camera (30 frames/s). The dense bed surface height was measured from the image of videotape. At lower liquid velocity, the dense bed surface increases with the elapsed time and then reaches a bed height, whereas at higher liquid velocity the dense bed surface increases sharply with the elapsed time, then decreases and reaches the bed height corresponding to the liquid-solid fluidized beds (water-polymer beads).

Keywords

Bed Collapse Three-Phase Fluidized Beds Dynamic Characteristics Dense Bed Height

References

Bhatia JK, Epstein N, "Three-Phase Fluidization; A General Wake Model," Proc. Int. Symp. on Fluidization and Its Application, Cepadues-Editions, Toulouse (1974)
Chen YM, Fan LS, Chem. Eng. Sci., 45, 935 (1990)
Epstein N, Can. J. Chem. Eng., 59, 649 (1981)
Fan LS, "Gas-Liquid-Solid Fluidization Engineering," Butterworth, Stoneham, MA (1989)
Fan LS, Powder Technol., 103(3), 300 (1999)
Han HD, Lee W, Kim YK, Kwon JL, Choi HS, Kang Y, Kim SD, Korean J. Chem. Eng., 20(1), 163 (2003)
Jin Y, Zhang J, "Bed Collapse Technique for Estimating Parameters of Generalized Wake Model for a Three-Phase Fluidized Bed," Proc. 5th Chinese National Fluidization Conference, Beijing, 327 (1990)
Kwauk M, "Fluidization," Science Press (1992)
Lee DH, Kim JO, Kim SD, Chem. Eng. Commun., 119, 179 (1993)
Lee DH, Epstein N, Grace JR, Korean J. Chem. Eng., 17(6), 684 (2000)
Maucci E, Briens CL, Martinuzzi RJ, Wild G, Powder Technol., 103(3), 243 (1999)
Park SH, Kim SD, Korean J. Chem. Eng., 20(1), 121 (2003)