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01168 LOW NOx COMBUSTION SYSTEMS AND SUPERHEATER CORROSION

Picture for 01168 LOW NOx COMBUSTION SYSTEMS AND SUPERHEATER
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Product Number: 51300-01168-SG
ISBN: 01168 2001 CP
Author: Wate T. Bakker, J.L. Blough & W.W. Seitz
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Low NO× combustion systems have caused a considerable increase in waterwall corrosion due to the deposition of iron sulfide on waterwall surfaces. There is also considerable evidence that the use of low NO× combustion systems causes some carburization of superheater (SH)- and reheater (RH) tubing. In this paper available field data are reviewed to determine if the carburization observed has led to increased superheater corrosion. In addition, results of superheater corrosion experiments with carbon- containing deposits and with corrosion coupons, carburized prior to testing will be reported. Results to date indicate that severe carburization will indeed greatly increase superheater corrosion rates. However, available field data indicate that carburization effects, if present, are overshadowed by variations in coal corrosivity. Keywords: Superheater, Reheater, Low NOx Fired Boilers
Low NO× combustion systems have caused a considerable increase in waterwall corrosion due to the deposition of iron sulfide on waterwall surfaces. There is also considerable evidence that the use of low NO× combustion systems causes some carburization of superheater (SH)- and reheater (RH) tubing. In this paper available field data are reviewed to determine if the carburization observed has led to increased superheater corrosion. In addition, results of superheater corrosion experiments with carbon- containing deposits and with corrosion coupons, carburized prior to testing will be reported. Results to date indicate that severe carburization will indeed greatly increase superheater corrosion rates. However, available field data indicate that carburization effects, if present, are overshadowed by variations in coal corrosivity. Keywords: Superheater, Reheater, Low NOx Fired Boilers
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