Causes analysis of cracking of boiler water wall tube

doi:10.13251/j.issn.0254-6051.2020.08.047

Abstract

Abstract: Aiming at the cracking of the water wall tube of a thermal power plant boiler, the failed water wall tube was sampled and analyzed by means of macroscopic morphology, material analysis, hardness test, metallographic structure inspection, scanning electron microscopy, energy spectrum analysis and XRD. The results show that the cause of the cracking of the water wall tube is hydrogen corrosion. There is a large amount of copper observed inside the main crack and oxide gaps. Owing to the poor thermal conductivity of the oxide layer, the local heat transfer is deteriorated. When the local heat load exceeds a certain limit, copper element is greatly enriched at the main crack, and the enriched copper accelerates the propagation of crack.

Key words: water wall tube, hydrogen corrosion, copper

CLC Number:

TG172.3

Xu Weixian, Qiao Lijie, Liang Zhigang. Causes analysis of cracking of boiler water wall tube[J]. Heat Treatment of Metals, 2020, 45(8): 245-248.

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