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Acoustic Drying of Coal in a Rotating Drum

Acoustic Drying of Coal in a Rotating Drum An acoustic method is proposed to intensify heat and mass transfer and decrease dust extraction in a rotating single-flow drum for drying D coal. An acoustic field is formed in the working space by means of two Hartmann whistles at the end surfaces of the discharge chamber, Experimental data regarding the change in the material and thermal balance indicates that the use of acoustic energy in a drying drum increases its productivity in terms of dry coal (by 4.76%) and also decreases the exhaust gases (by 8.98%) and the dust emissions (by 5.75%), while increasing the moisture removal from the coal (by 12.5%). With increased consumption of the fuel’s heat by 14.4%, the loss of heat with the exhaust gases is decreased by 12.61% and the loss with the dust by 9.41%. The total heat losses to the environment are decreased by 6.25%. With decrease in productivity of the drying drum in terms of wet coal by a factor of 1.75–1.98 and the use of acoustic energy, the yield of dry coal is increased by 12.06%, the proportion of fuel oil by 108% and the dust yield by 71.89%, with decrease in the participation of volatiles in heat treatment by 86.11% and decrease in the participation of recirculated material by 17.48%. The quantity of gas extracted is decreased by 35.5%, and moisture removal is decreased by 11.14%. The thermal efficiency of the system is hardly changed (by 0.987%). The use of acoustic energy is an inexpensive and efficient means of improving the thermal operation of drying drums. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Coke and Chemistry Springer Journals

Acoustic Drying of Coal in a Rotating Drum

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References (7)

Publisher
Springer Journals
Copyright
Copyright © Allerton Press, Inc. 2022. ISSN 1068-364X, Coke and Chemistry, 2022, Vol. 65, No. 11, pp. 508–513. © Allerton Press, Inc., 2022. Russian Text © The Author(s), 2022, published in Koks i Khimiya, 2022, No. 11, pp. 9–15.
ISSN
1068-364X
eISSN
1934-8398
DOI
10.3103/s1068364x22700235
Publisher site
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Abstract

An acoustic method is proposed to intensify heat and mass transfer and decrease dust extraction in a rotating single-flow drum for drying D coal. An acoustic field is formed in the working space by means of two Hartmann whistles at the end surfaces of the discharge chamber, Experimental data regarding the change in the material and thermal balance indicates that the use of acoustic energy in a drying drum increases its productivity in terms of dry coal (by 4.76%) and also decreases the exhaust gases (by 8.98%) and the dust emissions (by 5.75%), while increasing the moisture removal from the coal (by 12.5%). With increased consumption of the fuel’s heat by 14.4%, the loss of heat with the exhaust gases is decreased by 12.61% and the loss with the dust by 9.41%. The total heat losses to the environment are decreased by 6.25%. With decrease in productivity of the drying drum in terms of wet coal by a factor of 1.75–1.98 and the use of acoustic energy, the yield of dry coal is increased by 12.06%, the proportion of fuel oil by 108% and the dust yield by 71.89%, with decrease in the participation of volatiles in heat treatment by 86.11% and decrease in the participation of recirculated material by 17.48%. The quantity of gas extracted is decreased by 35.5%, and moisture removal is decreased by 11.14%. The thermal efficiency of the system is hardly changed (by 0.987%). The use of acoustic energy is an inexpensive and efficient means of improving the thermal operation of drying drums.

Journal

Coke and Chemistry – Springer Journals

Published: Nov 1, 2022

Keywords: Keywords: coal; drum drying; acoustic energy; dust removal; productivity

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