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Proceedings Paper

Root cause analysis of oxide scale forming and shedding in high temperature reheater of a 200MW super high pressure boiler
Author(s): Jiang Bo; Weidong Hao; Zhihong Hu; Fuguo Liu
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Paper Abstract

In order to solve the problem of over temperature tube-burst caused by oxide scale shedding and blocking tubes of high temperature reheater of a 200MW super high pressure power plant boiler, this paper expounds the mechanism of scale forming and shedding, and analyzes the probable causes of the tube-burst failure. The results show that the root cause of scale forming is that greater steam extraction flow after reforming of the second extraction leads to less steam flow into reheater, which causes over temperature to some of the heated tubes; and the root cause of scale shedding is that long term operation in AGC-R mode brings about great fluctuations of unit load, steam temperature and pressure, accelerating scale shedding. In conclusion, preventive measures are drawn up considering the operation mode of the unit.

Paper Details

Date Published: 3 December 2015
PDF: 6 pages
Proc. SPIE 9794, Sixth International Conference on Electronics and Information Engineering, 979413 (3 December 2015); doi: 10.1117/12.2203543
Show Author Affiliations
Jiang Bo, Shandong Electric Power Research Institute (China)
Weidong Hao, Shandong Electric Power Research Institute (China)
Zhihong Hu, Shandong Electric Power Research Institute (China)
Fuguo Liu, Shandong Electric Power Research Institute (China)


Published in SPIE Proceedings Vol. 9794:
Sixth International Conference on Electronics and Information Engineering
Qiang Zhang, Editor(s)

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