Liquid ash corrosion problems in fossil fired boilers
Journal Article
·
· Proc. - Electrochem. Soc.; (United States)
OSTI ID:5180757
The external corrosion of components of a boiler by the products of combustion of fossil fuels, can be related to both steamside and fireside conditions. On the inside of the tubes, steam reacts with steel to form iron oxide, an insulating layer which reduces heat transfer. Within the furnace, insulating deposits of boiler feedwater chemicals may form in the zones of highest heat input. The net effect is to raise metal temperature. Oil fueled boilers show ash corrosion by low melting slags of vanadium, sodium, and sulfur oxides; coal fueled boilers show ash corrosion by complex sulfates. A heat flow analysis is presented that relates overall heat transfer, boiler design parameters, internal scale thickness, and tube metal temperature. Oil fueled boilers show ash corrosion by low melting slags of vanadium, sodium, and sulfur oxides; coal fueled boilers show ash corrosion by complex sulfates. A heat flow analysis is presented that relates overall heat transfer, boiler design parameters, internal scale thickness, and tube metal temperature. Melting points of the liquid ash are measured using a differential scanning calorimeter (DSC) technique. Examples of corrosion induced failures are presented and explained on the thermal analysis and melting points of the liquid ash constituents.
- Research Organization:
- Riley Stoker Corp., Worchester, MA
- OSTI ID:
- 5180757
- Journal Information:
- Proc. - Electrochem. Soc.; (United States), Journal Name: Proc. - Electrochem. Soc.; (United States) Vol. 83-5; ISSN PESOD
- Country of Publication:
- United States
- Language:
- English
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