Method and device for analyzing steam seal rub-impact faults of shaft system of steam turbine generator unit

Abstract

The embodiment of the invention discloses a method and device for analyzing a steam seal rub-impact fault of a shaft system of a steam turbine generator unit. The method is used for solving the problem of how to achieve steam seal rub-impact fault thermosetting coupling of a shaft system of an actual large steam turbine generator unit, and comprises the steps: establishing a finite element model of the shaft system of the actual steam turbine generator unit, and associating a steam seal rub-impact model with the finite element model; according to the incidence relation, the relative displacement of the rotor center and the steam seal ring center, the gap radius of the steam seal ring and the relation between the relative displacement and the gap radius of the steam seal ring, determiningthat steam seal collision grinding occurs; determining the pretightening force of the spring piece on the steam seal ring, the speed of the rotor at the collision and grinding point and the stress ofthe rotor under the condition of steam seal collision and grinding; determining the bending moment of the rotor according to the translation displacement vector of each node of the shafting, the pre-tightening force of the spring piece on the steam seal ring, the speed of the rotor at the collision and grinding point and the stress of the rotor; and according to the bending moment of the rotor, determining a friction heat source of the rotor with the steam seal rub-impact fault.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of turbogenerators, and in particular to a method and device for analyzing a steam seal rubbing failure of a shafting system of a turbogenerator. Background technique [0002] Gland seal rubbing is the rubbing phenomenon between the rotating rotor and the stationary gland, and it is a typical dynamic and static rubbing fault. Dynamic and static rubbing failure is one of the most common failures in the operation of rotating machinery, and it is the main reason for frequent maintenance and failure of machinery. The physical phenomena involved in rubbing faults include: nonlinear, fractal, and chaotic phenomena under unbalanced responses; reverse eddy instability caused by friction; stiffening effect of increased critical speed; Newkirk caused by frictional heat effect etc. The first three types of phenomena are caused by the nonlinear characteristics of rubbing, and most of them appear ...

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Problems solved by technology

[0003] The embodiment of the present invention provides a method and device for analyzing the steam seal rubbing failure of the shaft system of a turbogenerator set, which is used to solve the problem of how to realize the thermosolid coupling of the steam seal rubbing failure of the shaft system of a large turbogenerator set

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