Abstract
In order to ensure the healthy operation of power plant boilers, this paper uses vernier calipers, spectrometers, optical microscopes, scanning electron microscopes, X-ray diffractometers and other instruments and equipment to explore the reasons for the thinning of the wall thickness of the fire side of the water wall tube of the power plant boiler from the aspects of wall size, chemical composition, metallographic structure, phase analysis and surface morphology. The test results show that the wall thickness of the fire side of the water wall tube of the utility boiler is obviously thinned due to the serious corrosion caused by O and low melting point Cl salt on its surface, which leads to material loss. The corrosion products are mainly Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> and a small amount of Cl salt containing $\text{Na},\text{K}$, Ca and other elements. The low melting point Cl salt deposits are in a molten state at high temperature, which promotes the corrosion of O and further accelerates the corrosion.
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