Elsevier

Powder Technology

Volume 49, Issue 1, December 1986, Pages 1-35
Powder Technology

Dense-phase pneumatic conveying: A review

https://doi.org/10.1016/0032-5910(86)85001-XGet rights and content

Abstract

In the last twenty years, several commercial systems for dense-phase pneumatic conveying have been developed. However, despite an extensive literature, the subject is very confusing, particularly for the beginner. This paper gives an introduction to, and a review of, dense-phase pneumatic conveying (defined here as the conveying of particles by air along a pipe which is filled with particles at one or more cross-sections). Firstly, the advantages, disadvantages and proposed definitions of dense-phase pneumatic conveying are discussed, then previous published work is reviewed. This review focuses on: horizontal and vertical conveying, the use of phase diagrams, choking and the suitability of powders for dense-phase conveying, and the pressure drop required to move a plug through a pipeline as a function of plug length. (Note: A plug is a length of bulk solids that occupies the full cross-section of the pipeline.) After that, some photographs of the observed flow patterns are described and discussed. This is followed by a brief description of a theoretical model for horizontal plug conveying and, finally, by conclusions and suggestions for further work.

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    Present address: Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061 U.S.A.

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