Selection Of Materials And Material Related Processes For Fcc Power Recovery Turbines.
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Fluid catalytic cracking (FCC) power recovery turbines have been in existence for over 50 years and through the year many changes have been made to design, materials, and material related processes. This paper highlights how materials are specified for the various components and what material properties/factors on has to consider for the application. Both rotating and nonrotating components will be reviewed for material selection. Due to the aggressive corrosion and erosion environments, selection of various coatings must be made that are resistant to aggressive environment. A number of various coatings for both erosion and high temperature corrosion resistance will be discussed. Components such as turbine disks, blades inlet/exhaust casings are costly to replace and delivery can be long. Consequently, their components need to have design proven repair procedures to minimize replacement costs and long lead times. This paper will highlight the various repair procedures and the technical support required for supplying a functional quality component. This paper will outline the remaining life assessment procedures and review the various damage mechanisms such as creep, fatigue, creep fatigue and various embrittlement mechanisms that can occur in FCC power recovery turbines. Also highlighted will be the various testing methods for determining life or life extension of components such as high precision stress relaxation (STR) test, which determines creep strength, and constant displacement rate (CDR), which evaluates fracture resistance. Other tests such as replication/microstructure analysis will also be reviewed for calculating the remaining life or life extension of the components.
Dowson, Phillip; Dowson, David (2009). Selection Of Materials And Material Related Processes For Fcc Power Recovery Turbines.. Texas A&M University. Turbomachinery Laboratories. Available electronically from