Non-contact online measurement method and device for macroscopic displacement of boiler main steam pipe

Abstract

A non-contact online measurement method of boiler main steam pipeline macroscopic displacement comprises the following steps: 1, establishing a spatial coordinate system of a pipeline center line and elastic support hangers; 2, simplifying the elastic support hangers into an upper rigid rod, a lower rigid and a middle spring, and respectively setting two marking points on the lower rigid rod; 3, arranging a high-definition camera, and connecting a main control computer through a wireless bridge; 4, acquiring the spatial coordinates of the marking points in the coordinate system through adopting a three dimensional reconstruction algorithm; 5, acquiring the coordinates of the marking points after creep deformation; 6, establishing the linear equation of the lower segment of the elastic support hangers; and 7, combining the linear equation with the curve equation of the external surface of the boiler main steam pipeline to obtain the coordinate of an intersection point B' of the linear l1 equation and the external surface of the boiler main steam pipeline, and accurately calculating the macroscopic displacement of the pipeline in every direction after taking regard of errors. High-stability and high-precision pipeline macroscopic displacement is obtained in an online non-contact manner.

Description

technical field [0001] The invention relates to a non-contact measurement method for the macroscopic displacement of boiler main steam pipes, in particular, through the binocular vision technology to recognize the acquired digital image, perform three-dimensional reconstruction, and obtain a three-dimensional scene, so as to use the geometric relationship to measure the boiler main steam. A non-contact online measurement method for the macroscopic displacement of the pipeline. The invention also relates to a non-contact measuring device for the macroscopic displacement of the boiler main steam pipe specially used in the method. Background technique [0002] With the expansion of the capacity and scale of the power system, the failure of power equipment has a greater impact on people's production and modern life, and users have higher and higher requirements for the safe operation and reliable power supply of the power system. This makes the safety and reliability of the pow...

AI Technical Summary

Problems solved by technology

In recent years, online life assessment systems for single components have begun to appear, but because most of these systems do not take into account the interaction of multiple failure mechanisms, there is a problem of large monitoring and evaluation errors

European and Japanese technical experts have established systematic life assessment guidelines for boiler piping systems, which consider the interactive effects of failure modes and have developed corresponding calculation software. However, it is still necessary to rely on offline detection data input to obtain calculation results. Many Lack of online measurement system for key parameters such as temperature, creep and displacement

In addition, the existing power plant boiler pipes are covered with a layer of heat insulation layer, which brings great inconvenience to the direct measurement of the displacement of the pipe due to high temperature creep.

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