Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler

doi:10.11930/j.issn.1004-9649.2017.05.007.06

Abstract

Abstract: In order to explore the causes and the mechanism of frequent high-temperature corrosion in the supercritical opposed firing boilers, the cause analysis is carried out for a 600-MW boiler through the coal quality analysis, the waterwall thickness measurement, the waterwall surrounding atmosphere testing, and the corrosion products analysis by using SEM, EDS and XRD. The study results show that the waterwall high-temperature corrosion occurs mainly in the high-temperature load areas of the burners at all levels on both sides and spreads unevenly. The unevenness is attributed to the high-temperature sulfurization and oxidation caused by the sulfide and the oxygen in the combustion. In addition, the reducing atmosphere formed in the lower part of the furnace leads to the increase of the H₂S concentration making the high-temperature corrosion at this part worse.

Key words: supercritical boiler, high-temperature corrosion, SEM analysis, EDS analysis, XRD analysis, atmosphere condition, cause of corrosion

CLC Number:

TK223.23

LIU Xinchang, YAN Xiaozhong, JING Pei, LI Pei, ZHANG Yiman, WU Aijun, CHEN Shaolong. Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler[J]. Electric Power, 2017, 50(5): 7-12.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.05.007.06

https://www.electricpower.com.cn/EN/Y2017/V50/I5/7

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