Rapid assessment method for vibration damage and service life of high and low water pipelines in thermal power plants

Abstract

The invention provides a rapid assessment method for vibration damage and life of a high-low plus drainage pipeline in a thermal power plant. Select the first measuring point on the fatigue weak section, and select the second measuring point at the axial length L from the first measuring point; when the pipeline vibrates, measure the vibration frequency of the pipeline, and the first measuring point and the second measuring point The amplitude of the two measuring points, and calculate the amplitude difference between the two measuring points, and record the duration of the operating conditions that cause pipeline vibration; calculate pipeline damage, pipeline cumulative damage and pipeline remaining vibration life. The application is simple, fast, and accurate in evaluation, and can meet the needs of rapid assessment of vibration damage and life of high and low water drainage pipelines in thermal power plants in practical engineering applications, effectively reducing the occurrence of downtime accidents caused by pipeline cracking and leakage, and improving production safety.

Description

technical field [0001] The invention relates to the technical field of pipeline vibration damage assessment, and more specifically relates to a rapid assessment method for vibration damage and service life of a thermal power plant's high and low adding and draining water pipelines. Background technique [0002] The high and low water addition and drainage system of a thermal power plant is an important part of the steam-water circulation system. During the start-up and shutdown of the unit, due to the existence of vapor-liquid two-phase flow in the pipe and the structural layout characteristics of this type of pipe on site, there will often be more obvious Low frequency and high amplitude vibration will cause fatigue damage. [0003] Without changing the characteristics of the system, the internal excitation force of the pipeline cannot be eliminated. Conventional reinforced pipelines can reduce the vibration amplitude of the pipeline, but often lead to an increase in the vi...

AI Technical Summary

Problems solved by technology

Due to the complexity of the pipeline vibration simulation calculation considering the vapor-liquid two-phase flow, the professional ability of the technicians and the performance of the computing equipment are extremely high. The method of fatigue test by sampling is time-consuming and laborious, and it also damages the site structure. The above method None of them can meet the rapid processing and evaluation of on-site engineering problems

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