The Method for Assessing the Causes of Damage to a Bearing in a Rotary Air Preheater

The article presents a method for identifying the cause of damage to a rotary air preheater on one of the fluidized bed boilers operating in a power plant. The bearing in question operates under harsh conditions with exhaust gas temperature reaching 287 [°C] and causing its casing to heat up intensively. It is therefore important to ensure that the bearing is constantly cooled by water, which lowers the operating temperature and thus extends its service life. Unfortunately, after a short period of operation, the upper double-row spherical roller bearing was damaged and the tests presented in the assessment method helped to determine the cause of damage to its casing.