Hydrodynamic performance of spouted beds with different types of draft tubes--颗粒学报PARTICUOLOGY

Nagashima, H., Suzukawa, K., & Ishikura, T. (2013). Hydrodynamic performance of spouted beds with different types of draft tubes. Particuology, 11(5), 475–482. https://doi.org/10.1016/j.partic.2013.01.007

Hydrodynamic performance of spouted beds with different types of draft tubes

Hiroshi Nagashima^*, Kazumi Suzukawa, Toshifumi Ishikura

Department of Chemical Engineering, Fukuoka University, 19-1, Nanakuma 8-chome, Jonan-ku, Fukuoka 814-0180, Japan

10.1016/j.partic.2013.01.007

Volume 11, Issue 5, October 2013, Pages 475-482

Received 22 August 2012, Revised 13 December 2012, Accepted 12 January 2013, Available online 7 June 2013.

E-mail: h-ngsm@fukuoka-u.ac.jp

Highlights

• A spouted bed with different draft tubes was studied by using angular particles.

• Annulus gas flow rate increased while using a conical–cylindrical porous draft tube.

• Annulus gas flow rate reached a level ever obtained by a spouted bed without a draft tube.

• Solid circulation rate was improved by using a conical–cylindrical porous draft tube.

Abstract

Hydrodynamic performance of spouted beds with four different types of draft tubes has been investigated experimentally. In this work, irregular and angular particles were used as the spouting solids and the results were compared with those of the previous work in which regular and round particles had been used. It was found that the conical–cylindrical porous draft tube was the best option for solid–gas contact and solids circulation as in the case of round particles. Moreover, by using conical–cylindrical porous draft tube, the gas flow rate through the annulus reached 65–70%, equal to the level of a conventional spouted bed.

Graphical abstract

Keywords

Spouted bed; Conical–cylindrical porous draft tube; Angular sand; Gas–solid contact; Solids circulation rate

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