Size-dependent coalescence kernel in fertilizer granulation—A comparative study--颗粒学报PARTICUOLOGY

Roy, P., Vashishtha, M., Khanna, R., & Subbarao, D. (2009). Size-dependent coalescence kernel in fertilizer granulation—A comparative study. Particuology, 7(6), 445–450. https://doi.org/10.1016/j.partic.2009.09.005

Size-dependent coalescence kernel in fertilizer granulation—A comparative study

Papiya Roy ^a *, Manish Vashishtha ^a, Rajesh Khanna ^a, Duvvuri Subbarao ^b

a Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
b Universiti Teknologi PETRONAS, 31750, Tronoh, Perak, Malaysia

10.1016/j.partic.2009.09.005

Volume 7, Issue 6, December 2009, Pages 445-450

Received 30 March 2009, Revised 1 July 2009, Accepted 18 September 2009, Available online 16 October 2009.

E-mail: papiya.roy@gmail.com

Highlights

Abstract

Granulation is a key process in several industries like pharmaceutical, food, fertilizer, agrochemicals, etc. Population balance modeling has been used extensively for modeling agglomeration in many systems such as crystallization, aerosols, pelletisation, etc. The key parameter is the coalescence kernel, β(i,j) which dictates the overall rate of coalescence as well as the effect of granule size on coalescence rate. Adetayo, Litster, Pratsinis, and Ennis (1995) studied fertilizer granulation with a broad size distribution and modeled it with a two-stage kernel. A constant kernel can be applied to those granules which coalesce successfully. The coalescence model gives conditions for two types of coalescence, Type I and II. A two-stage kernel, which is necessary to model granule size distribution over a wide size distribution, is applied in the present fluidized bed spray granulation process. The first stage is size-independent and non-inertial regime, and is followed by a size-dependent stage in which collisions between particles are non-random, i.e. inertial regime. The present work is focused on the second stage kernel where the feed particles of volume i and j collide and form final granule ij instead of i + j (Adetayo et al., 1995) which gives a wider particle size distribution of granules than proposed earlier.

Graphical abstract

Keywords

Granulation; Coalescence kernel; Population balance

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