Smith, EE
1990
Fireside Corrosion in PC-Fired Boilers
Harb, J.N. and Smith, E.E.
Progress in Energy and Combustion Science, 16, 169-190, (1990). Funded by ACERC.
This review has examined fireside corrosion of pc-fired boilers in both the waterwall and superheater regions. The present understanding of corrosion phenomena has resulted in the development of strategies to control tube wastage. The corrosion problem persists, however, in spite of efforts to control it. The physical mechanisms that govern such corrosion are complex and not fully understood to date. The problem is complicated further by localized attack in the form of pits of cracks that may result in tube failure without a significant decrease in the average tube-wall thickness. Mechanistic models that allow quantitative prediction of local corrosion rates from first principles have not yet been developed. Hence, quantitative prediction of fireside corrosion rates is not feasible at the present time.
Mathematical models, however, may play an important role in the a priori prediction of boiler locations where corrosion problems are likely to develop, and the operating conditions under which corrosion is expected to occur. A combustion model could be used to simulate the environment inside a utility boiler for a variety of fuels and operating conditions. Once the conditions inside the boiler have been modeled, the corrosion behavior expected at a given location could be determined by comparing the local boiler environment with corrosion data obtained experimentally under similar conditions. Corrosion data would be accumulated from experience with industrial boilers and from well-defined laboratory experiments. Such a procedure could provide a valuable tool for use in boiler design and in the prediction of problems associated with a changing fuel supply.
Smith, EE
1990
Fireside Corrosion in PC-Fired Boilers
Harb, J.N. and Smith, E.E.
Progress in Energy and Combustion Science, 16, 169-190, (1990). Funded by ACERC.
This review has examined fireside corrosion of pc-fired boilers in both the waterwall and superheater regions. The present understanding of corrosion phenomena has resulted in the development of strategies to control tube wastage. The corrosion problem persists, however, in spite of efforts to control it. The physical mechanisms that govern such corrosion are complex and not fully understood to date. The problem is complicated further by localized attack in the form of pits of cracks that may result in tube failure without a significant decrease in the average tube-wall thickness. Mechanistic models that allow quantitative prediction of local corrosion rates from first principles have not yet been developed. Hence, quantitative prediction of fireside corrosion rates is not feasible at the present time.
Mathematical models, however, may play an important role in the a priori prediction of boiler locations where corrosion problems are likely to develop, and the operating conditions under which corrosion is expected to occur. A combustion model could be used to simulate the environment inside a utility boiler for a variety of fuels and operating conditions. Once the conditions inside the boiler have been modeled, the corrosion behavior expected at a given location could be determined by comparing the local boiler environment with corrosion data obtained experimentally under similar conditions. Corrosion data would be accumulated from experience with industrial boilers and from well-defined laboratory experiments. Such a procedure could provide a valuable tool for use in boiler design and in the prediction of problems associated with a changing fuel supply.