Continuous segregation of binary heterogeneous solids in fluidized beds--颗粒学报PARTICUOLOGY

Prasad Babu, M., P.S.T, S., & Krishnaiah, K. (2017b). Continuous segregation of binary heterogeneous solids in fluidized beds. Particuology, 35, 93-100. https://doi.org/10.1016/j.partic.2017.05.004

Continuous segregation of binary heterogeneous solids in fluidized beds

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.2017.05.004

Volume 35, December 2017, Pages 93-100

Received 14 August 2015, Revised 25 February 2017, Accepted 6 May 2017, Available online 12 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 beds was studied.

• Separation factor and product quality were explained in terms of holdup information.

• Correlations for predicting the separation factor and product quality were proposed.

• Effect of bottom discharge pipe diameter on segregation behavior was studied.

Abstract

Continuous segregation of a binary mixture of heterogeneous (different density) solids is carried out in a gas–solid fluidized bed. We investigate how gas velocity, solids feed rate, flotsam feed composition, bottom discharge pipe diameter, and minimum fluidization velocity ratio of the flotsam to jetsam particles influence the solids holdup, separation factor, and product quality (flotsam purity at the top outlet). The results are interpreted in terms of solids holdup information. The results indicate that the separation factor decreases when the gas velocity, bottom discharge pipe diameter, flotsam feed composition, or the minimum fluidization velocity ratio increase, while the separation factor increases as the solids feed rate increases. The product quality decreases when the gas velocity, solids feed rate, or minimum fluidization velocity ratio increase, while the product quality increases as the bottom discharge pipe diameter or flotsam feed composition increase. Correlations for predicting the separation factor and product quality are proposed using a logistic model for individual flotsam feed compositions, which satisfactorily compares with the present experimental data.

Graphical abstract

Keywords

Normal fluidized bed; Continuous segregation; Heterogeneous particles; Separation factor; Holdup

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