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Design Innovation

Prediction of Thermoacoustic Vibration of Burner/Furnace Systems in Utility Boilers

[+] Author and Article Information
Frantisek L. Eisinger

 Foster Wheeler North America Inc., Perryville Corporate Park, Clinton, NJ 08809

Robert E. Sullivan

 Foster Wheeler North America Inc., Perryville Corporate Park, Clinton, NJ 08809frank_eisinger@fwc.com

J. Pressure Vessel Technol 130(1), 015002 (Jan 08, 2008) (5 pages) doi:10.1115/1.2826459 History: Received April 20, 2006; Revised May 16, 2007; Published January 08, 2008

Seven burner/furnace systems, three of which vibrated and four of which did not vibrate in operation are evaluated for thermoacoustic oscillations. The evaluation is based on the Rijke and Sondhauss models representing the combined burner/furnace (cold/hot) thermoacoustic systems. Frequency differences between the lowest vulnerable furnace acoustic frequencies in the burner axial direction and those of the systems’ Rijke and Sondhauss frequencies are evaluated to check for resonances. Most importantly, the stability of the Rijke and Sondhauss models is checked against the published design stability diagram of Eisinger (1999, “Eliminating Thermoacoustic Oscillations in Heat Exchanger and Steam Generator Systems  ,” ASME J. Pressure Vessel Technol., 121, pp. 444–452) and Eisinger and Sullivan (2002, “Avoiding Thermoacoustic Vibration in Burner/Furnace Systems  ,” ASME J. Pressure Vessel Technol., 124, pp. 418–424). It is shown that thermoacoustic oscillation can be well predicted by the published design stability diagram with the vibrating cases falling into the unstable zone above the stability line and the nonvibrating cases congregating in the stable zone below the stability line. The evaluation suggests that the primary criterion for predicting thermoacoustic oscillations is the stability of the thermoacoustic system and that frequency differences or resonances appear to play only a secondary role. It is concluded, however, that in conjunction with stability, the primary criterion, sufficient frequency separation shall also be maintained in the design process to preclude resonances. The paper provides sufficient details to aid the designers.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

General arrangement of burner/furnace system shown schematically in plan view

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Figure 2

Cross section of burner arrangement indicated cold air length l1

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Figure 3

Composite sketch of burner/furnace system with superimposed Rijke and Sondhauss acoustic pressure waves

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Figure 4

Thermoacoustic stability line with superimposed evaluated data based on Rijke and Sondhauss thermoacoustic models

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