Abstract
The reason and mechanism of the failure of SA210-C steel liquid wall were analyzed by means of macro morphology analysis, chemical composition analysis, microstructure analysis and XRD phase analysis. The test results show that the main reason for the failure of SA210-C steel water wall tube is the corrosion under the inner wall scale, and the long-term unqualified boiler water quality is the main factor causing the corrosion of water wall.
Highlights
In recent years, non-stop accidents caused by corrosion under scale frequently occur in thermal power generating units
The corrosion part of water wall pipe analyzed in this test occurred in the inner wall of the pipe to the fire side, and formed multiple corrosion pits under the scale of the inner wall of the pipe, which is typical corrosion under the scale
When the inner surface of the pipe on the heating surface of boiler is attached with scale, serious corrosion will occur under it, which is called under scale corrosion or under sediment corrosion
Summary
Non-stop accidents caused by corrosion under scale frequently occur in thermal power generating units. Due to the poor thermal conductivity of scale, the temperature of the places where the deposits are attached to the metal wall surface rises sharply. The boiler is prone to bulge, perforation, rupture and other phenomena at the location of corrosion under scale, which can cause leakage of heating surface, hinder the normal operation of the unit, and even cause serious consequences such as non-stop of the unit [1,2,3]. The type of corrosion and the specific cause of corrosion are studied through the analysis of the sampling test of scaling corrosion water wall tube in a power station.
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