Pulsed‐Flow Air Classification for Waste‐to‐Energy
Publication: Journal of Energy Engineering
Volume 109, Issue 2
Abstract
The development and testing of the concept of pulsed‐flow air classification for waste‐to‐energy production are discussed. Air classifiers, a potentially valuable unit operation in waste‐to‐energy production facilities, currently do not meet expectations. Standard designs generally lose large amounts of combustible material as well as produce a fuel that is high in metal and glass contaminants. Pulsed‐flow classification is presented as a concept which can avoid both pitfalls. Municipal solid waste (MSW) is composed of particles which can be cataloged as combustible and non‐combustible fractions by defining a density split between aluminum and plastic: generally all other non‐combustibles are more dense than aluminum, while all other combustibles are less dense than plastic. However, current designs for classifiers tend to separate by aerodynamic characteristics which do not always produce a split based on density alone. Pulsed‐flow classifiers are seen to offer a unique solution to this puzzle. In this paper, each aspect of theory and laboratory testing is presented, including: (1) Preliminary determination; (2) particle characteristics; (3) theory of pulsed‐flow classification; (4) experimental equipment; (5) laboratory testing; and (6) pulsed‐flow air classification for energy production. Conclusions from the research are summarized in the final section of the paper.
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References
1.
Ower, E., and Pankhurst, F. C., The Measurement of Airflow, Pergamon Press, Elmsford, N.Y., 1977, chapter XII.
2.
Henrikson, R. A., A Descriptive Mathematical Model of Air Classification, Center for Environmental Engineering, Duke University, Durham, N.C., 1979.
3.
Equipment Tests and Evaluations: Study of Processing Equipment for Resource Recovery Systems, U.S. Environmental Protection Agency, Cincinnati, Ohio, Vol. 2, 1978, pp. 74–75.
4.
McNabb, M. B., Fundamental Aspects of Air Classification and Design: A New Test for the Evaluation of Air Classifier Performance, Center for Environmental Engineering, Duke University, Durham, N.C., 1980.
5.
Resource Recovery from Municipal Solid Waste in Ohio, Ohio Environmental Protection Agency, Columbus, Ohio, 1975.
6.
Senden, M. M. G., Performance of Zig‐Zag Air Classifiers at Low Particle Concentrations, Eindhoven Technical University, The Netherlands, 1978.
7.
Significance of Size Reduction in Solid Waste Management, U.S. Environmental Protection Agency, Cincinnati, Ohio, 1977, p. 7.
8.
Taggart, A. F., Handbook of Mineral Pressing, John Wiley and Sons, New York, N.Y. 1945, p. 48.
9.
Third Report to Congress: Resource Recovery and Waste Reduction, U.S. Environmental Protection Agency, Washington, D.C. 1975.
10.
Worrell, W. A., Testing and Evaluation of Three Air Classifier Throat Designs, Center for Environmental Engineering, Duke University, Durham, N.C., 1977, pp. 49–53.
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Copyright © 1983 ASCE.
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Published online: Jun 1, 1983
Published in print: Jun 1983
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