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RESEARCH PAPERS

A Model of the Enhancement of Coal Combustion Using High-Intensity Acoustic Fields

[+] Author and Article Information
S. Yavuzkurt, G. Koopmann

Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802

M. Y. Ha

Department of Mechanical and Production Engineering, The Pusan National University, Kumjung Ku, Pusan, Korea

A. W. Scaroni

Fuel Science Program, The Pennsylvania State University, University Park, PA 16802

J. Energy Resour. Technol 113(4), 277-285 (Dec 01, 1991) (9 pages) doi:10.1115/1.2905912 History: Received July 23, 1990; Revised June 23, 1991; Online April 16, 2008

Abstract

A model for the enhancement of coal combustion in the presence of high-intensity acoustic fields has been developed. A high-intensity acoustic field induces an oscillating velocity over pulverized coal particles otherwise entrained in the main gas stream, resulting in increased heat and mass transfer. The augmented heat and mass transfer coefficients, expressed as space and time-averaged Nusselt and Sherwood numbers for the oscillating flow, were implemented in an existing computer code (PCGC-2) capable of predicting various aspects of pulverized coal combustion and gasification. Increases in the Nusselt and Sherwood numbers about 45, 60 and 82.5 percent at sound pressure levels of 160, 165 and 170 dB for 100-μm coal particles were obtained due to increase in the acoustic slip velocity associated with the increased sound pressure levels. The main effect of the acoustic field was observed during the char combustion phase in a diffusionally controlled situation. A decrease in the char burn-out length (time) of 15.7 percent at 160 dB and 30.2 percent at 170 dB was obtained compared to the case with no sound for the 100-μm coal particles.

Copyright © 1991 by The American Society of Mechanical Engineers
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