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Received: 2007-04-04

Revision Accepted: 2007-07-16

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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.11 P.1762-1774


Resuspension of wall deposits in spray dryers

Author(s):  HANUS M.J., LANGRISH T.A.G.

Affiliation(s):  School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW 2006, Australia

Corresponding email(s):   tim.langrish@usyd.edu.au

Key Words:  Wall deposition, Spray dryers, Dried particles, Re-entrainment, Adhesive forces

HANUS M.J., LANGRISH T.A.G.. Resuspension of wall deposits in spray dryers[J]. Journal of Zhejiang University Science A, 2007, 8(11): 1762-1774.

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DOI - 10.1631/jzus.2007.A1762

wall deposition occurs in spray dryers when dried or partially dried particles contact and adhere to the walls during operation, thus reducing the yield of product collected. Wall deposits also present a product contamination risk and a fire or explosion risk when spray drying products that oxidize exothermically, such as milk powder. re-entrainment is the resuspension of spray dryer wall deposits into the main gas stream for collection as product. Literature suggests that the process for re-entrainment of particles from spray dryer wall deposits is strongly dependent on particle size and gas velocity.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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