ANALYSIS OF TUBE FAILURE ON A HIGH-PRESSURE DRUM BOILER

J Chin Soc Corr Pro

2003, Vol. 23

Issue (5): 312-315 DOI:

Failure Analysis

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ANALYSIS OF TUBE FAILURE ON A HIGH-PRESSURE DRUM BOILER

Hong Xv

电力科学研究院

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Abstract The microstructure,crack shape,appearance of the fr acture and the composition of the corrosion product were studied with the help o f optical microscope,scanning electron microscope (SEM)and electron spectromete r.Investigations confirmed that the boiler tube failed from both the superfluous free hydroxyl in boiler water to determine which a new method has been devised and the local overheat caused by deposition in boiler tubes.The relationship bet ween conductivity and free sodium hydroxide at simple makeup demineralizer efflu ent was proposed.It was found that the poor quality of makeup water was the root cause of superfluous free hydroxyl in boiler water.The long-term prevention of crater corrosion will include:keeping a clean boiler,controlling boiler free hyd roxyl levels,avoid flame impingement or burner misalignment,and eliminating weld protrusions and other features that can disrupt the local boiler water flow.It is also extremely important that the makeup water treatment is optimized,and con ductivity controlled to a specified limit.

Key words: drum boiler boiler tube crater corrosion alkaline corr osion

Received: 24 February 2002

ZTFLH:

TG174

Corresponding Authors: Hong Xv

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Hong Xv. ANALYSIS OF TUBE FAILURE ON A HIGH-PRESSURE DRUM BOILER. J Chin Soc Corr Pro, 2003, 23(5): 312-315 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I5/312

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