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Corrosion Cases and Cause Analysis of Steam Tubine Low PressureCylinder blades for the Super - Critical Unit

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  • 1. China Power Huachuang Electricity Technology Research Co., Ltd., Suzhou 215123, China;2. China Power Shentou Power Generation Co., Ltd., Shuozhou 036011, China

Online published: 2025-07-10

Abstract

It was generally found that the low pressure cylinder blades of steam turbines had pitting corrosion during the overhaul of super-critical units. In order to analyze the causes of low pressure cylinder blades pitting corrosion, the corrosion products were analyzed by scanning electron microscope and energy disperse spectrometer, and the water vapor of the unit was detected by ion chromatograph. Results showed that the content of CO2 in water vapor was very small, which had little effect on the blade pitting corrosion. The main cause of pitting corrosion was the improper control of the operation end point of fine treatment mixed bed, resulting in the high chloride ion in the water vapor. It was pointed out that controlling the operation end point of fine treatment mixed bed could effectively avoid the pitting corrosion of steam turbine low pressure cylinder blades of super-critical units.

Cite this article

HONG Xin-hua, LIU Hai-ling, LIU Xiang-liang . Corrosion Cases and Cause Analysis of Steam Tubine Low PressureCylinder blades for the Super - Critical Unit[J]. Materials Protection, 2021 , 54(8) : 172 . DOI: 10.16577/j.cnki.42-1215/tb.2021.08.030

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