BEARING RETROFIT ELIMINATES CLASSIFIER PROBLEMS

摘要

Coal-Fired Power plants use gearboxes located on the top of each coal pulverizer to drive the rotating classifier. Rotating classifiers ensure that the coal is of the appropriate size for proper combustion within the steam generator. These classifiers, also referred to as dynamic classifiers, combine the best features of static and normal rotating classifiers. As early as 1998, Babcock & Wilcox (B&W) recognized that the ball bearings used in their DSVS classifiers were costly and took a long time to replace. Therefore B&W engineers teamed with Timken engineers to redesign the classifiers to include two Timken standard large bore 25-inch tapered roller bearings. The bearings were a readily available standard model, cost effective and compatible with the previous bearing inside diameter (ID) and outside diameter (OD). All new B&W classifiers now incorporate these bearings.