Judgment method for high temperature corrosion degree of boiler water cooling wall in large power station
A technology for high-temperature corrosion and power plant boilers, applied in combustion methods, combustion chambers, outer covers/linings, etc., can solve problems such as long maintenance periods, safety accidents, and high maintenance costs, and achieve the effect of ensuring uniqueness and overcoming limitations
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[0025] The Shimen Power Plant in Hunan Province installed 2×300MW units. During the overhaul of the No. 1 boiler in 1999, serious high-temperature corrosion was found in the water wall around the high-load area of the burner. The wall thickness measurement results show that the wall thickness of the water-cooled pipe with a design specification of φ63.5×8mm is only 6.8~7.1mm, which has been thinned by 0.9~1.2mm, and the corrosion rate is about 0.7~1.3mm / (10 4 )h. If the development continues at this speed, a large-scale water wall explosion accident may occur in recent years. Therefore, it is urgent to analyze and study its high-temperature corrosion mechanism and main influencing factors as soon as possible, seek the best technical way to solve the problem, and improve the safety and reliability of the heating surface of the boiler.
[0026] First, determine the four major factors affecting high-temperature corrosion: Standard coal converted to sulfur content S b ar ; Co conte...
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