Variable Injection Active‐Pulse Air Classification
Publication: Journal of Environmental Engineering
Volume 115, Issue 2
Abstract
The effect of varying the time of particle injection within pulse periods, called the pulse injection time, in active‐pulse air classification is examined. A mathematical model based on a fluid mechanical force balance is used to study the behavior of spheres injected at different pulse times into a periodic, time‐varying, incompressible air flow, and the results are related to laboratory results of active‐pulse air classification experiments. Pulse injection time is found to affect the forces governing particle movement and particle separation. The results of theoretical modeling suggest that synchronizing feed inputs with pulse time can result in increased separation efficiency. A sawtoothed wave form airflow with a decay fraction equal to 0.1 is found to separate the particles studied most effectively over the full range of varying pulse injection times. Laboratory results, confined only to the measurement of particle drop times, are consistent with the mathematical predictions.
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References
1.
Borse, G. J. (1985). FORTRAN 77 and evaluation methods for engineers. PWS Engineering, Boston, Mass.
2.
Henrikson, R. A. (1979). “A descriptive mathematical model of air of classification.” Duke Univ. Envir. Center, Durham, N.C.
3.
Jackson, C. R., Stessel, R., and Peirce, J. J. (1988). “Passive pulsing air classifier theory.” J. Envir. Engrg., ASCE, 114(1), 106–119.
4.
McNabb, M. B. (1983). “A new test for the evaluation of air classifier performance,” thesis presented to Duke University, Durham, N.C., in partial fulfillment of the requirements for the degree of Master of Science.
5.
Mironer, A. (1979). Engineering fluid mechanics. McGraw‐Hill Book Co., Inc., New York, N.Y.
6.
Peirce, J. J., and Stessel, R. (1983). “Pulsed‐flow air classification (for waste‐to‐energy).” J. Energy Engrg., ASCE, 109(2), 60–73.
7.
Peirce, J. J., and Stessel, R. (1985). “Separation of solid waste with pulsed airflow.” J. Envir. Engrg., ASCE, 116(6), 833–849.
8.
Peirce, J. J., and Stessel, R. (1986a). “Comparing pulsing classifiers for waste‐to‐energy.” J. Energy Engrg., ASCE, 112(1), 1–13.
9.
Peirce, J. J., and Stessel, R. (1986b). “Passive pulsing air classifiers for energy production.” J. Energy Engrg., ASCE, 112(1), 25–36.
10.
Peirce, J. J., and Stessel, R. (1987). “Particle separation in pulsed air flow.” J. Fluids Engrg., 113(10), 1594–1607.
11.
Senden, M. M. G. (1978). “Performance of zigzag air classifiers at low particle concentrations.” Eindoven Univ. of Tech., Eindhoven, The Netherlands.
12.
Stessel, R. I. (1983). “Pulsed flow air classification,” thesis presented to Duke University, Durham, N.C., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 115 • Issue 2 • April 1989
Pages: 395 - 408
Copyright
Copyright © 1989 ASCE.
History
Published online: Apr 1, 1989
Published in print: Apr 1989
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