Factors And Preventive Measures Relative To The High Temperature Corrosion Of Blade/Disk Components In FCC Power Recovery Turbine.
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Power recovery expander turbines in the Fluid Catalytic Cracking Unit (FCCU) process operate under certain conditions that can adversely affect their performance and operational capability or integrity. For instance, erosion of the rotor blade tips by the spent catalyst can significantly reduce their efficiency and power output. Perhaps more significantly, the high temperature gaseous/catalyst environments that a power recovery turbine operates can, under certain conditions, lead to corrosive attack. This corrosive attack can cause blade failure in the location of the blade/disk root attachment where the stress intensity at the corrosive attack location exceeds the critical stress intensity necessary for fracture to occur. The fracture mechanism of Waspaloy turbine blades and how the various factors such as corrosion product morphology, depth of penetration into the alloy and a reduction in fracture toughness of the material, influence the fracture mechanism are addressed. Since the corrosive attack is the main contributor that leads to failure, the characterization and identification of the various corrosion product phases that can form under certain gaseous/ catalyst conditions will be examined. As a result of both the ability to accurately predict the susceptibility of corrosive attack and an understanding of the failure mechanism, certain protective measures can be taken. The preventive measures that have been developed by the senior author's company, such as a steam barrier system and a protective coating of the blade, are highlighted.
Dowson, Phillip; Rishel, Douglas M.; Bornstein, Norman S. (1995). Factors And Preventive Measures Relative To The High Temperature Corrosion Of Blade/Disk Components In FCC Power Recovery Turbine.. Texas A&M University. Turbomachinery Laboratories. Available electronically from