Ultrasonic detecting method of hydrogen damage of water cooling wall tube of boiler

Abstract

The invention belongs to the technical field of industrial detection and particularly relates to an ultrasonic detecting method of hydrogen damage of a water cooling wall tube of a boiler. The detecting method comprises the following steps: S1: taking down a measured object and performing surface treatment on the measured object; S2: mounting the measured object on an operation frame; S3: coatinga coupling agent on a measured surface of the measured object and mounting an ultrasonic thickness gauge; S4: selecting parameters of the ultrasonic thickness gauge and measuring the thickness; S5: recording measured data and changing a measured position. The scheme is simple in steps and convenient in measurement in the operation process; in addition, the operating frame is matched for use, so that the portability in detection is improved.

Description

technical field [0001] The invention relates to the technical field of industrial detection, in particular to an ultrasonic detection method for hydrogen damage of boiler water-cooled wall tubes. Background technique [0002] The water wall is the main heating part of the boiler, which is composed of several rows of steel pipes and distributed around the boiler furnace. Its inside is flowing water or steam, and the outside receives the heat of the flame in the boiler furnace. It mainly absorbs the radiant heat of the high-temperature combustion products in the furnace, and the working medium moves up in it, and evaporates when heated. [0003] The carbon in the steel is replaced by hydrogen, resulting in the disappearance and decarburization of the pearlite in the steel, and the reaction generates methane. The diffusion ability of methane in the steel is very low, and it is easy to gather in the original microscopic gaps in the grain boundary, and the amount of methane incr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ultrasonic detection method for hydrogen damage of boiler water-cooled wall tubes to solve the problem that the carbon in the steel is replaced by hydrogen in the above-mentioned background technology, thereby causing the disappearance and decarburization of pearlite in the steel. Causes huge pressure between grains, eventually causing cracks, reducing the lightness and plasticity of steel

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