Detection method and evaluation method for residual life of anti-corrosion alloy coating on heating surface of waste incineration boiler

Abstract

The invention provides a method for rapidly detecting and evaluating the residual life of an anti-corrosion alloy coating on a heating surface of a waste incineration boiler. The method comprises the following steps: detecting the surface hardness and components of the alloy coating; according to the evaluation method, based on the distribution relation of hardness and components in the cross section of the alloy coating along with the thickness of the coating, the residual life of the coating is rapidly evaluated by detecting the surface hardness and the components of the coating corresponding to the thickness of the residual coating during furnace shutdown. According to the method, the application effect of the anti-corrosion alloy coating in the heating surface of the waste incineration boiler can be rapidly judged, and long-period stable operation of the boiler is guaranteed; in order to solve the problems of large workload, large detection result deviation and the like caused by the adoption of an ultrasonic thickness gauge for the residual thickness of the anticorrosive coating during furnace shutdown at present, a rapid residual life detection and evaluation method based on the change of coating surface hardness and components along with the thickness is adopted. The boiler shutdown time is saved, the workload is reduced, the detection deviation is reduced, and long-period stable and safe operation of the boiler is guaranteed.

Description

technical field [0001] The invention relates to the field of protection of the heating surface of an urban-source domestic waste incineration boiler, in particular to a detection method and an evaluation method for the residual life of the anti-corrosion alloy coating on the heating surface of the waste incineration boiler. Background technique [0002] In order to alleviate the tube burst caused by the high temperature corrosion of the heating surface of the waste incineration waste heat boiler and achieve safe and stable operation, it is necessary to carry out anti-corrosion treatment on the heating surface of the boiler. At present, the main anti-corrosion technologies are castables, alloy coatings and the pipes themselves. Among them, the most important way to improve the anticorrosion performance of the heating surface is to add a protective alloy coating between the metal of the heating surface and the corrosive medium. Compared with the anti-corrosion of the castable...

AI Technical Summary

Problems solved by technology

The ultrasonic thickness gauge is traditionally used for measurement, which has the following disadvantages: 1) The measurement area is not representative, and the corrosion-prone area cannot be found;

[0005] 2) Grinding and removing ash, surface polishing and other work at each measurement point, the workload is heavy, resulting in longer shutdown time, during the shutdown period, domestic waste cannot be processed, increasing the pressure on environmental protection; 3) The traditional residual wall thickness is directly The measured value is inaccurate in the measurement method, because the measurement process requires the probe to be closely attached to the pipe wall, but the pipe wall is arc-shaped, and there is a lot of dust in the furnace during the shutdown

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