Material ageing detecting method for thermal power plant

Abstract

The invention discloses a material ageing detecting method for a thermal power plant. The method comprises the following steps of S1, sampling: selecting novel ferrite type heat resistant steel used by a power station boiler; S2, creep test: placing a sample into a GWT2105 electronic type high-temperature creep endurance strength testing machine of American MTS company; observing the number and hole diameter of creep holes of the sample and the change of the ratio of the total volume of the hole relative to the whole specimen volume along with the time when the sampling material is in different stress levels and different test temperature, wherein the initial original temperature is 560 DEG C; the temperature is gradually increased to 760 DEG C; in the creep process, synchrotron radiationis simultaneously used as a laser light source. Compared with other extraction technologies, the material ageing detecting method has the advantages that the synchrotron radiation technology is used for studying the rest service life predication study on the ferrite type heat resistant steel material, so that the detection and evaluation results are more reliable and accurate; the predication accuracy of the final service life is improved.

Description

technical field [0001] The invention relates to material aging detection, more specifically, to a material aging detection method for thermal power plants. Background technique [0002] As the operating time of thermal power plants increases year by year, the number of aging units in overdue service continues to increase, the creep damage of high-temperature components and the aging of materials are becoming more and more serious, and damage accidents occur from time to time, among which the superheater, reheater and other heating surface tubes burst. It is always the main cause of unplanned downtime of thermal power generating units. According to statistics, about 2 / 3 of boiler accidents in power plants are caused by pipe burst accidents on the heating surface. [0003] Therefore, it is imminent to solve the problems of life assessment and operation safety of aging units in thermal power plants. Practice has proved that the traditional remaining life assessment method is ...

AI Technical Summary

Problems solved by technology

Practice has proved that the traditional remaining life assessment method is not very reliable, especially for long-term remaining life prediction, the existing method may produce an error of more than one order of magnitude