Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics--颗粒学报PARTICUOLOGY

Chavan, P. V., Thombare, M. A., Bankar, S. B., Kalaga, D. V., & Patil-Shinde, V. A. (2018). Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics. Particuology, 38, 134-142. https://doi.org/10.1016/j.partic.2017.08.003

Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics

Prakash V. Chavan ^a *, Manjusha A. Thombare ^a, Sandip B. Bankar ^b, Dinesh V. Kalaga^c, Veena A. Patil-Shinde ^a

a Department of Chemical Engineering, College of Engineering, Bharati Vidyapeeth Deemed University, Pune 411 043, India b Department of Biotechnology and Chemical Technology, School of Chemical Technology, Alto University, P.O. Box 16100, FI-00076 Aalto, Finland c Department of Chemical Engineering, City College of New York, CUNY, NY, USA

10.1016/j.partic.2017.08.003

Volume 38, June 2018, Pages 134-142

Received 22 May 2017, Revised 2 August 2017, Accepted 24 August 2017, Available online 11 December 2017, Version of Record 2 April 2018.

E-mail: pvchavan@bvucoep.edu.in

Highlights

• Novel multistage solid–liquid circulating fluidized bed (SLCFB) was proposed.

• The working of the SLCFB was demonstrated within the flooding and loading limits.

• The ratio of solid circulation rate to liquid velocity set criterion of scale-up of the system.

• Hydrostatic head predominantly contributed to the pressure drop in the multistage column.

• Multilayer perceptron neural network based model was employed for prediction of solid hold-up.

Abstract

The present work proposes a novel radially cross-flow multistage solid–liquid circulating fluidized bed (SLCFB). The SLCFB primarily consists of a single multistage column (having an inner diameter of 100 mm and length of 1.40 m), which is divided into two sections wherein both the steps of utilization or loading (e.g., adsorption and catalytic reaction) and regeneration of the solid phase can be carried out simultaneously in continuous mode. The hydrodynamic characteristics were studied using ion exchange resin as the solid phase and water as the fluidizing medium. The loading and flooding states were determined for three particle sizes; i.e., 0.30, 0.42, and 0.61 mm. The effects of the superficial liquid velocity and solid feed rate on the solid hold-up were investigated under loading and flooding conditions. The solid hold-up increases with an increase in the solid feed rate and decreases with an increase in the superficial liquid velocity. An artificial-intelligence formalism, namely the multilayer perceptron neural network (MLPNN), was employed for the prediction of the solid hold-up. The input space of MLPNN-based model consists of four parameters, representing operating and system parameters of the proposed SLCFB. The developed MLPNN-based model has excellent prediction accuracy and generalization capability.

Graphical abstract

Keywords

Solid–liquid fluidized bed; Solid–liquid circulating fluidized bed; Hydrodynamics; Modeling

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