Status Report on Studies of Recovery Boiler Composite Floor Tube Cracking
- ORNL
Cracking of the stainless steel layer of co-extruded 304L stainless steel/SA210 Gd A 1 carbon steel black liquor recovery boiler floor tubes has been identified as one of the most serious material problems in the pulp and paper industry. A DOE-funded study was initiated in 1995 with the goal of determining the cause of and possible solutions to this cracking problem. These studies have characterized tube cracking as well as the chemical and thermal environment and stress state of floor tubes. Investigations of possible cracking mechanisms indicate that stress corrosion cracking rather than thermal fatigue is a more likely cause of crack initiation. The cracking mechanism appears to require the presence of hydrated sodium sulfide and is most likely active during shut-downs and/or start-ups. Based on these results and operating experience, certain alloys appear to be more resistant than others to cracking in the floor environment, and certain operating practices appear to significantly lessen the likelihood of cracking. This report is the latest in a series of progress reports presented on this project.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- Sponsoring Organization:
- USDOE Office of Industrial Technologies (OIT) (EE-20)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 8250
- Report Number(s):
- ORNL/CP-103296; ED 19 02 00 0; ON: DE00008250
- Country of Publication:
- United States
- Language:
- English
Similar Records
Overview of the DOE studies of recovery boiler floor tube cracking
Analysis of cracking of co-extruded recovery boiler floor tubes