Analysis of Fracture Failure Causes of Moving Blades of Flue Gas Turbine
The shutdown fault caused by the abnormal vibration of the flue gas turbine of a catalytic cracking unit was dismantled and inspected.Various technical means were employed for sampling inspection and testing,with the objective of identifying the fracture and wear of the moving blade that had been identified by macroscopic inspection.Stress analysis of the moving blade was carried out by finite element numerical simulation.The results indicate that the blade fractures from the tenon tooth,and subsequently,the broken blade body contacts the adjacent three blades when it rotates at high speed with the rotor,resulting in significant deformation and the initiation of the vibration interlocking shutdown of the unit and the shutdown of the device.The aerodynamic design of the flue gas turbine moving blades exhibits a low safety margin,while local stress concentration problems are evident in the tenon teeth and tenon grooves.Additionally,slight scaling occurs between the flue gas turbine moving blades and the enclosure belts.The results of the analysis indicated the necessity for targeted optimization measures,which were implemented and resulted in the achievement of positive outcomes.These measures ensured the long-term stability of the flue gas turbine.
flue gas turbinemoving bladefracturefailure analysis
万方数据
维普
