Judgment method for high temperature corrosion degree of boiler water cooling wall in large power station

Abstract

The present invention relates to coal burning boiler in thermal power plant, and is especially judgment method for high temperature corrosion degree of boiler water cooling wall in large power station. The present invention features that the judgment includes first determining the main factors of affecting the high temperature corrosion of water cooling wall; then determining measuring conditions and relevant measuring parameters; and final rating to high temperature corrosion trend of water cooling wall via grey clustering procedure. The present invention makes it possible to grasp high temperature corrosion degree of boiler at all time for taking measures timely and to select apparatus reforming scheme with optimal performance / cost ratio.

Description

technical field [0001] The invention relates to the field of coal-fired boilers for thermal power generation, in particular to a method for judging the degree of high-temperature corrosion of water-cooled walls of large-scale power plant boilers. Background technique [0002] In recent years, the phenomenon of high-temperature corrosion on the heating surface of coal-fired power plant boilers is more common, especially the problem of high-temperature corrosion on the water-wall of boilers with subcritical parameters fueled with lean coal has become increasingly prominent. Safe and economical operation has caused huge economic losses to thermal power plants. After the high-temperature corrosion problem occurs in the water wall of large-scale power plant boilers, how to analyze the main influencing factors, accurately judge the degree of high-temperature corrosion, and correctly select the equipment renovation plan with the best cost performance is a key technology to actually...

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Problems solved by technology

At present, there have been many articles and reports on the research on the high-temperature corrosion mechanism of coal-fired boiler water wall at home and abroad, but in terms of the high-temperature corrosion degree discrimination method, all of them measure the corrosion thickness within a period of time after the high-temperature corrosion occurs. The corrosion rate and corrosion degree can be calculated from this. At this time, the boiler has been severely corroded, resulting in high maintenance costs and long maintenance periods. Some safety accidents have even occurred, causing huge losses. It is impossible to predict the occurrence and extent of high-temperature corrosion, and take measures early, thereby reducing maintenance costs and shortening the maintenance period

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