Continuous segregation of binary heterogeneous solids in a fast-fluidized bed--颗粒学报PARTICUOLOGY

Prasad Babu, M., P.S.T, S., & Krishnaiah, K. (2017). Continuous segregation of binary heterogeneous solids in a fast-fluidized bed. Particuology, 35, 101-107. https://doi.org/10.1016/j.partic.2017.04.006

Continuous segregation of binary heterogeneous solids in a fast-fluidized bed

M. Prasad Babu, P.S.T. Sai ^*, K. Krishnaiah

Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India

10.1016/j.partic.2017.04.006

Volume 35, December 2017, Pages 101-107

Received 29 September 2015, Revised 9 April 2017, Accepted 18 April 2017, Available online 19 August 2017, Version of Record 30 November 2017.

E-mail: psts@iitm.ac.in; drpstsai@gmail.com

Highlights

• Continuous segregation of binary heterogeneous solids mixture in fluidized bed was investigated.

• Effects of operating conditions on separation factor and product quality were studied.

• Empirical correlations for predicting the separation factor and product quality were obtained.

Abstract

Continuous segregation of binary heterogeneous solids (different density mixtures) is carried out in a gas–solid fluidized bed to study the effects of gas velocity, solids feed rate, feed composition and density difference of solids on the separation factor (recovery of flotsam at top outlet) and the quality of the product (purity of flotsam at top outlet) in a continuous fast-fluidized bed. The holdup of the bed material is obtained in each experimental run. It is observed that the separation factor decreases with increase in solids feed rate or density difference of solids, and increases with gas velocity or proportion of flotsam in the feed. The quality of the product decreases with increase in gas velocity or solids flow rate, and increases with feed composition or density difference of solids. The experimental results show that the separation factor and the quality of the product are more sensitive to gas velocity than to other operating parameters. Empirical correlations for predicting the separation factor and quality of the product are proposed based on the Richards model for individual flotsam mass fraction in the feed, and the predictions agree satisfactorily with the present experimental data.

Graphical abstract

Keywords

Fast-fluidized bed; Gas–solid; Continuous segregation; Heterogeneous solids; Solids holdup

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