Device and method for monitoring crack propagation life of turbine rotor

Abstract

The invention provides a device and a method for monitoring internal crack propagation life of a turbine rotor. The method includes the specific steps of: flaw detection and determination of crack size of the turbine rotor; computation of maximum main stress of parts where the crack is; computation of a critical crack size of the turbine rotor; computation of crack propagation life of the turbine rotor; computation of accumulation loss of the crack propagation life of the rotor in an overspeed test process device; computation of the accumulation loss of the internal crack propagation life of the turbine rotor; computation of the internal crack propagation residue life of the turbine rotor; controlling the crack propagation residue life of the turbine rotor; and printing an output result. The device and the method have the advantages that: the residual crack propagation life of the turbine rotor can be calculated on line and monitored regularly; if the residual crack propagation life of the turbine rotor is relatively short, the residual crack propagation life of the turbine rotor is rationally used by immediately overhauling (A-level overhaul); therefore, a technical scheme that the residual crack propagation life of the turbine rotor is monitored regularly is achieved.

Description

technical field [0001] The invention relates to a monitoring device and a method for monitoring the extended life of cracks inside a steam turbine rotor, and belongs to the technical field of steam turbines. Background technique [0002] The steam turbine rotor is characterized by large size and high-speed rotation, and the steam turbine rotor produces large principal stresses during start-up, shutdown and overspeed tests. No cracks can be found in the flaw detection inspection of the steam turbine rotor during forging and processing. During the operation of the steam turbine, under the action of large principal stress, the steam turbine rotor may expand into visible cracks in the flaw detection inspection. During the operation of the steam turbine, the rotor of the steam turbine is under the action of a large principal stress, and the flaw detection of the rotor shows that the cracks continue to expand. When the crack of the steam turbine rotor expands to the critical crac...

AI Technical Summary

Problems solved by technology

When the crack of the steam turbine rotor expands to the critical crack size of the rotor crack, the steam turbine rotor may undergo brittle fracture, resulting in damage to the steam turbine

The existing steam turbine rotor life monitoring technology provides a monitoring method for the crack initiation life of the steam turbine rotor, but there is no suitable device and method for monitoring the crack growth life of the steam turbine rotor in service

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