Hydrodynamics of oil palm frond in a swirling fluidized bed dryer

Mohideen Batcha, Mohd Faizal and Sulaiman, Shaharin Anwar and Raghavan, Vijay R. (2012) Hydrodynamics of oil palm frond in a swirling fluidized bed dryer. Applied Mechanics and Materials , 117 . pp. 1829-1833. ISSN 1660-9336

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/AMM.1...

Abstract

This paper presents the hydrodynamics of chopped oil palm fronds (OPF) from cold flow experiments carried out in a swirling fluidized bed dryer (SFBD). The chopped OPF was 10 - 15 mm in size and falls in between Geldart type B and D. The OPF which consisted of leaves and petiole (stem) were first separated before studied individually due to their different physical characteristics. 2 bed loadings of 120g and 140g were investigated for bed pressure drop, (APb), minimum fluidization velocity (U,,,f) and minimum swirling velocity (Ums) while regimes of operation were closely observed. The experiments yield that the OPF leaves and petiole have distinct hydrodynamic behavior due to their different bulk densities and voidage, hence suggesting drying should also be conducted separately unlike the current industrial practice. The leaves have lower Umf and Ums compared to the petiole and thus swirling motion was initiated earlier in SFBD when operating with leaves. Both samples however, have limited operating velocities due to elutriation. In conclusion, the SFBD was found to fluidize the chopped OPF well while providing good solid-gas contact which is highly desired for drying.

Item Type:Article
Uncontrolled Keywords:hydrodynamics; swirling fluidized bed dryer; oil palm frond; pressure drop; minimum fluidization velocity
Subjects:T Technology > TP Chemical technology > TP155-156 Chemical engineering
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
ID Code:3896
Deposited By:Normajihan Abd. Rahman
Deposited On:11 Mar 2014 12:29
Last Modified:22 Jan 2015 08:30

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