Real-time dynamic measurement method for measuring radial clearance between steam turbine rotor and stator

Abstract

The invention provides a real-time dynamic measurement method for measuring radial clearance between a steam turbine rotor and a stator. The method is characterized in that the method comprises the steps of determining distance measurement devices for radial clearance, determining radial clearance between the rotor and the stator, determining the radial clearance between the rotor and the stator, determining the distance from an emitter to the surface of the rotor, calculating vertical offset amount of the rotor when the center of the rotor shifts, calculating horizontal offset amount of the rotor when the center of the rotor shifts, calculating the rotor offset amount at any position and calculating the radial clearance between the steam turbine rotor and the stator. The method can carry out dynamic measurement on the rotor labyrinth clearance and blade top labyrinth clearance of a running steam turbine accurately and quickly, thereby solving the problem that the measuring error of the radial clearance between the steam turbine rotor and the stator is large and the radial clearance cannot be measured online dynamically and accurately, ensuring safe and economical operation of the machine set and saving halt overhaul time.

Description

technical field [0001] The invention relates to the field of thermal equipment performance state monitoring and diagnosis, and relates to a real-time dynamic measurement method for the radial gap between a steam turbine rotor and a stator. Background technique [0002] A steam turbine is a high-speed rotating machine that converts steam heat energy into mechanical energy. In order to prevent friction between the rotating parts and the stationary parts of the steam turbine, a certain gap must be left between the rotating parts and the stationary parts of the steam turbine. The size of the radial clearance of the flow part of the steam turbine is an important index affecting the safety and reliability of the flow part of the steam turbine. If the gap is too small, it is likely to cause rubbing between the static and dynamic parts, which will cause the turbine’s stationary blades to wear and reduce the working efficiency of the unit. In severe cases, the unit will be forced to...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that it is difficult to realize accurate real-time dynamic measurement of the radial clearance of the flow part of the existing large-scale steam turbine during operation, the present invention proposes a method that can quickly and accurately detect the radial clearance of the steam turbine in operation to realize the rotor seal The precise and dynamic measurement method of the gap and the tip seal gap can more truly detect the current operating state of the steam turbine, ensure the safe and economical operation of the unit, and save the downtime and overhaul time

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