Prediction of Flow and Erosion in Power Utility Boilers and Comparison With Measurement

[+] Author and Article Information
J. Y. Tu

Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia

C. A. J. Fletcher

Centre for Advanced Numerical Computation in Engineering & Science (CANCES), The University of New South Wales, Sydney 2052, Australia

M. Behnia

School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia

J. A. Reizes

School of Mechanical Engineering, University of Technology, Sydney, P. O. Box 123 Broadway, NSW 2007, Australia

D. Owens, P. Jones

Power Plant Engineering, Pacific Power, New South Wales 2001, Australia

J. Eng. Gas Turbines Power 119(3), 709-716 (Jul 01, 1997) (8 pages) doi:10.1115/1.2817046 History: Received January 01, 1996; Revised November 01, 1996; Online November 19, 2007


Multidimensional simulations of both flue gas and fly ash (solid particle) flows with application to erosion prediction in the economisers of coal-fired power utility boilers are reported. A computer code specifically designed for power utility boilers, DS4PUB (Design Software for Power Utility Boilers), was used for the calculations. The major area of erosion often occurs at the economizer of the boiler and depends on the particulate velocity and concentration so that computational results include the economizer inlet distribution of the mean flue gas and particulate velocities, and fly ash concentration. The computer code was validated by comparisons with previously available experimental data and recently performed measurements for flue gas flow velocity, dust burden, and erosion rates at the inlet of economizers in large operating power stations. The results of the multidimensional simulations agreed reasonably well with the experimental measurements. An important finding of this study is that the transverse location of maximum erosion in the economizer tube bank strongly depends on the upstream geometric design of the boiler. For boilers with a shorter turning flow path, the maximum erosion is found to be close to the rear wall of the economizer because both the maximum particulate velocity and concentration occur in this region. For configurations with a long flow path, which includes a splitter plate, the maximum erosion region was found to be closer to the front wall of the economizer, mainly due to the high flow velocity in this region. A relatively high erosion area close to the side and rear wall was also found because of the high concentration of large fly ash particles in this area. Interesting feature of fly ash flow in multidimensional complex boiler geometries such as concentration distributions for different fly ash particle sizes are also discussed.

Copyright © 1997 by The American Society of Mechanical Engineers
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