Abstract: Axial compressor is the core equipment of catalytic cracking unit. From June to August 2020, the blade fracture accidents occurred in three axial compressors of certain company, resulting in shutdown, which had a great impact on production. Through analysis, it is found that the main reason for the blade fracture is that the compressor deviated from the design operating conditions or there was stress concentration of the blade itself. Micro-cracks occurred during long-term operation, and the cracks continued to expand and eventually led to fatigue fracture. After that, the blade detection was strengthened, and the cracked blades were replaced preventively, which has improved the operation reliability of the compressors and achieved good results.

Key words: axial compressor, blade, fatigue fracture, micro crack