In a large capacity tangentially fired boiler, the final reheater tubing sustained abnormal oxidation and localized excessive metal wastage in a short time of the unit operation. The root causes of the problem are identified by test data analysis. The test data indicated that the reheater tubing metal temperatures in the affected areas exceeded the recommended limit of the metal oxidation temperature due to higher than expected local gas temperatures and velocities. A soot-blower facing the overheated portion of the reheater leading tubes accelerated the process of metal wastage by periodically removing the oxide layer. The configuration of the boiler internals upstream of the reheater section is found to be the main cause of the localized overheating. Side-to-side gas flow/temperature stratification due to tangential firing contributed to a lesser degree to the problem. The results and conclusions presented in this paper should be a beneficial guide to the designer of large capacity boilers.
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March 2008
Research Papers
Combined Effects of Overheating and Soot-Blower Erosion on Reheater Tubing in a Gas-Fired Large Capacity Boiler
Nasr M. Hosny
Nasr M. Hosny
Higher Institute of Engineering,
Thebes Academy
, P.O. Box 2075, Cairo 11511, Egypt
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Nasr M. Hosny
Higher Institute of Engineering,
Thebes Academy
, P.O. Box 2075, Cairo 11511, EgyptJ. Eng. Gas Turbines Power. Mar 2008, 130(2): 023002 (4 pages)
Published Online: January 22, 2008
Article history
Received:
May 28, 2006
Revised:
June 10, 2007
Published:
January 22, 2008
Citation
Hosny, N. M. (January 22, 2008). "Combined Effects of Overheating and Soot-Blower Erosion on Reheater Tubing in a Gas-Fired Large Capacity Boiler." ASME. J. Eng. Gas Turbines Power. March 2008; 130(2): 023002. https://doi.org/10.1115/1.2795769
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