Advanced Coatings on Furnace Wall Tubes |
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Authors: | Y Matsubara Y Sochi M Tanabe A Takeya |
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Affiliation: | (1) Surface Treatment Division, Dai-Ichi High Frequency Co. Ltd, Kawasaki, Japan |
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Abstract: | Nickel-based self-fluxing alloy coating extends the service life of furnace wall tubes at waste incineration plants due to
its excellent corrosion resistance and heat resistance. Fusing of such coatings by induction heating offers improved efficiency
and reliability of products. Compared with conventional plasma, flame, and high-velocity oxy-fuel spraying thermal-sprayed
coatings, induction-fused coatings provide a far stronger metallurgical bond at the interface, while minimizing the inclusion
of pores. In addition, the tubes are less costly than those with welded coatings, and the process reduces the distortion of
the products, facilitating easier final assembly. A successful experimental application of 11 units in a waste incinerator
revealed virtually no corrosion on the exposed surfaces, and showed an improved water heating efficiency over that of the
original tubes. Such units are now being employed in four incinerators in Taiwan, and continuing tests are showing great promise. |
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Keywords: | boiler plants corrosion heat treatment of coatings |
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