Boiler four-pipe real-time service life assessment method considering wall thickness reduction and overheating influence

Abstract

The invention relates to a boiler four-pipe real-time service life evaluation method considering wall thickness reduction and overheating influence, and belongs to the technical field of metal materials. The method comprises the following steps: (a) calculating the pipe wall thinning condition by a system according to the operating environment and material characteristics of four pipes of a boiler; (b) calculating the thinning rate of four pipes of the boiler, and (c) calculating the remaining life of the thinned boiler pipe according to a strength checking theory; (d) calculating the stress of the position of the weld joint for the boiler pipe with the weld joint; (e) correcting the remaining life; (f) evaluating the service life of the boiler tube from the perspective of the temperatureand the lasting strength of the boiler tube; (g) correcting and calculating the service life of the boiler tube under the condition of exceeding the designed and calculated wall temperature and overheating; and (h) evaluating and calculating the comprehensive service life Rf of the boiler tube under the combined action of wall thickness reduction and overheating. According to the method, the failure factors of the four pipes of the boiler can be comprehensively covered, and the state and the service life can be accurately evaluated.

Description

technical field [0001] The invention relates to a method for evaluating the real-time life of four tubes of a boiler considering the effects of wall thickness reduction and overheating, and belongs to the technical field of metal materials. Background technique [0002] Superheater, reheater, water wall, economizer (referred to as "boiler four tubes") and other components are the main structural parts inside the boiler, which have been operating in very harsh environmental media such as flames, flue gas, and fly ash for a long time. Therefore, a series of changes in the structure and properties of materials occur during the service process, and these changes involve complex aging and failure mechanisms such as creep, fatigue, corrosion, and erosion. [0003] There is no unified high-level understanding of the failure of the four-tube boiler in service and its safe operation supervision, and there are still some limitations in the research on the heating surface of the boiler...

AI Technical Summary

Problems solved by technology

Different failure mechanisms often act on the heating surface tube at the same time, resulting in the interaction of two or even more failure mechanisms

[0005] However, the traditional life assessment method used in the past only considers the extrapolation and prediction under the condition of constant temperature and stress and a single failure mechanism, such as the Chinese patent application number 201610101979.0

The traditional life assessment method has a long time period and large deviation, which cannot be used as a reference for state assessment, resulting in low recognition in the industry

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