Steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology

Abstract

The invention belongs to the industrial control field and in particular relates to a steel chimney corrosion monitoring system and method based on a non-contact ultrasonic technology. The system is composed of an electromagnetic ultrasonic probe, a climber, an annular guide rail, a longitudinal guide rail, a controller, a data acquisition instrument and a computer. The non-contact ultrasonic technology is utilized to measure the thickness of a steel chimney in a non-contact state, and the corrosion position and the corrosion risk of the chimney can be acquired through comparative analysis of thickness distribution of an inner steel barrel and thickness vibration tendency along with time history, so that an advice is given timely for maintenance. The system and the method can automatically, rapidly and precisely realize assessment and analysis of the steel chimney health condition, so as to reduce the corrosion risk and the corrosion degree of the steel chimney and improve the working efficiency of the steel chimney and even the whole production process.

Description

technical field [0001] The invention belongs to the field of industrial control, in particular to a steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology. Background technique [0002] In the process of thermal power generation, metallurgy and chemical production, coal-fired boilers are often used to provide heat, and rely on heat to do work to generate energy. During the combustion of coal, in addition to releasing heat, sulfur dioxide (SO 2 ), sulfur trioxide (SO 3 ), nitrogen oxides (NO x ), chlorides, fluorides, fly ash and slag and other by-products. If these by-products are not properly treated and utilized, they will have a catastrophic impact on the environment, animal and plant health, and human production and life after discharge, such as causing human respiratory and nervous system diseases, forming photochemical smog, producing The greenhouse effect and the hole in the ozone layer, the formation of acid rain and the c...

AI Technical Summary

Problems solved by technology

However, with the prolongation of the service time of the chimney, the attenuation of the effect of the anti-corrosion layer and the transmission of the condensate by defects during the construction process are unavoidable, so the migration of the condensate to the inner surface of the steel inner cylinder is only a matter of time and location distribution; Corrosion protection (such as the construction of various qualities of corrosion protection and the use of cathodic protection) and characterization methods (such as the use of infrared imagers to measure the temperature field outside the chimney) that have been implemented do not allow a comprehensive and continuous monitoring of the overall health of the chimney And corrosion risk assessment, moreover, the method of "estimating" the corrosion degree inside the chimney with a separate infrared temperature measurement method itself is debatable, because the light, sunlight and airflow outside the chimney will have a significant impact on the temperature measurement results of the infrared method

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