Identifying Sources of Thermoacoustic Vibrations in Industrial Furnaces and Boilers

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Title Identifying Sources of Thermoacoustic Vibrations in Industrial Furnaces and Boilers
Creator Flynn, T.J.
Contributor Fuller, T.A., Rufener, S., Finney, C.E.A., Daw, C.S.
Date 2018-09-18
Description Paper from the AFRC 2018 conference titled Identifying Sources of Thermoacoustic Vibrations in Industrial Furnaces and Boilers
Abstract Industrial gas-fired boilers, furnaces and heaters occasionally suffer low-frequency vibrations generated by dynamic feedback between the burner (or burners) and acoustic modes in adjacent cavities in the main combustion chamber or ductwork. Feedback occurs when pressure pulses associated with acoustic resonances propagate to the burner so that they are in phase with combustion rate fluctuations. When the combustion and acoustic fluctuations become sufficiently phase-synchronized, normal sources of dissipation are insufficient to damp the combined pressure waves, and they can become sufficiently amplified to reduce thermal efficiency, increase emissions, and even cause structural damage. In the literature, such oscillations are referred to as thermoacoustic oscillations or ‘rumble', and their basic physics have been the subject of numerous investigations for well over a century. Although it occurs relatively infrequently, rumble poses a significant challenge because it is difficult to predict, diagnose, and resolve. The underlying relationships involved are sufficiently complex that it is possible for two apparently identical boilers or furnaces to exhibit completely different rumble tendencies. In this study, we review common sources of rumble and how nonlinear signal analyses, such as bivariate mutual information and transfer entropy, can be used to locate both its sources and impact in boilers, furnaces and heaters.
Type Event
Format application/pdf
Rights No copyright issues exist
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Metadata Cataloger Catrina Wilson
ARK ark:/87278/s6k97jks
Setname uu_afrc
Date Created 2018-12-12
Date Modified 2018-12-12
ID 1389179
Reference URL https://collections.lib.utah.edu/ark:/87278/s6k97jks
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