ause Analysis on Cracking Tube Leakage of High-Pressure Heater in a Power Plant

doi:10.11930/j.issn.1004-9649.2014.5.20.4

Abstract

Abstract: In a power plant, cracking tube leakage occurs in the high-pressure heaters, which has threatened the operation security of the generating units. In this paper, the causes of the cracking are analyzed by using macro morphology inspection, macro fracture analysis, X-ray energy spectrum analysis of corrosion products and metallographic observation. The analysis results reveal that the radial cracks at the tube orifice are induced by stress corrosion, and the circumferential cracks at the tubes around the tube plate by both corrosion fatigue and stress corrosion, while the main causes of the corrosion are the over-numbered chloride ionsin the water and the air leakage at the drainage side due to the condenser leakage. Some preventive measures are therefore put forward.

Key words: high-pressure heater, heat exchange tube, stainless alloy, corrosion, leakage

CLC Number:

TM621.4

SONG Fei, LIU Feng, ZHAO Guang-sen, DENG Yu-qiang, ZHANG Xiang-jin. ause Analysis on Cracking Tube Leakage of High-Pressure Heater in a Power Plant[J]. Electric Power, 2014, 47(5): 20-24.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.5.20.4

https://www.electricpower.com.cn/EN/Y2014/V47/I5/20

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