Case Study on High Temperature Oxidation in Supercritical/Ultra-Supercritical Boilers

doi:10.11930/j.issn.1004-9649.2014.8.88.5

Abstract

Abstract: In this paper, the influencing factors of high temperature oxidation are investigated and analyzed based on the typical high temperature oxidation cases of the supercritical/ultra supercritical boilers with 600-MW and above capacities in 2013. The factors which affect the boiler high temperature oxidation and oxide scale exfoliation are sorted out and categorized from the aspects of tube material, wall temperature and medium composition. The study indicates that, firstly, the material of TP347H with coarse grain size exhibits low resistance to water vapor oxidation at high temperatures; secondly, early oxide scale exfoliation tends to appear when the steam temperature of the boilers is lower than its designed value; thirdly, the alarm level of wall temperature provided by boiler manufactures cannot effectively guide the unit operation to prevent the formation and exfoliation of oxidation scale; and finally, there is no direct relationship between the oxygenation treatment of boiler feedwater and the broad exfoliation of oxide scale. Therefore, the suggestions on further studies and preventive measures on high temperature oxidation are proposed.

Key words: supercritical/ultra supercritical boiler, high temperature oxidation, oxide scale exfoliation, 18Cr austenitic stainless steel, wall temperature

CLC Number:

TK224.9

LI Zhi-gang, ZHANG Yu-bo, YAO Bing-yin. Case Study on High Temperature Oxidation in Supercritical/Ultra-Supercritical Boilers[J]. Electric Power, 2014, 47(8): 88-93.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.8.88.5

https://www.electricpower.com.cn/EN/Y2014/V47/I8/88

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