Analysis of failures in boiler tubes due to fireside corrosion in a waste heat recovery boiler

The dynamic creep rupture of a secondary superheater tube in a 43MW coal-fired boiler by the decarburization and multilayer oxide scale buildup on both sides

“…The tube creep failures had been studied for over half century [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The classic methodology applied the Larson-Miller Parameter (LMP) to analysis the tube life [5][6][7][8].…”

Studies on Hot Corrosion of the Microstructurally Different Regions of 2.25Cr-1Mo (T22) Boiler Tube Steel Weldment

“…4 The corrosion rate (in terms of weight gain) of base metal, weld metal, and HAZ regions has been found in the following order base metal > HAZ > weld metal. …”

Investigation into high-temperature corrosion in a large-scale municipal waste-to-energy plant

“…High temperature corrosion of heat exchangers is one of the most important factors that limits the efficiency of various energy systems [1][2][3][4]. In combustion processes utilizing biomass or MSW, the steam temperatures are usually kept lower than 450°C to avoid corrosion problems [5].…”

“…Raising the steam temperature by an additional 50°C can result in significant increases in the corrosion rate in a biomass power plant [2,6]. Such problems become amplified by: (i) the use of fuels containing alkali metals, heavy metals, Cl and S; (ii) fluctuations in the flue gas flow; (iii) the high velocity, particle-bearing flue gas; and finally (iv) deposit (combustion residues) accumulation [3,5,7,8]. High temperature corrosion can be amplified by a range of factors.…”

“…Unfortunately, WTE facilities are more susceptible to severe corrosion than other types of energy systems due to the presence of deposits containing alkali and heavy metals (such as Na, K, Pb, Zn and Cd), as well as Cl and S. These elements originate in the fuel and lead to the formation of eutectic compounds with low melting points [3,5,[7][8][9][10]; fuel composition is the main factor determining high temperature corrosion in WTE plants. Liquid phase corrosion or hot corrosion is highly likely to take place on superheater tubes, resulting in high annual repair and replacement costs.…”