Root cause analysis of oxide scale forming and shedding in high temperature reheater of a 200MW super high pressure boiler

Jiang Bo; Weidong Hao; Zhihong Hu; Fuguo Liu

doi:10.1117/12.2203543

3 December 2015 Root cause analysis of oxide scale forming and shedding in high temperature reheater of a 200MW super high pressure boiler

Jiang Bo, Weidong Hao, Zhihong Hu, Fuguo Liu

Author Affiliations +

Proceedings Volume 9794, Sixth International Conference on Electronics and Information Engineering; 979413 (2015) https://doi.org/10.1117/12.2203543
Event: Sixth International Conference on Electronics and Information Engineering, 2015, Dalian, China

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.

Citation Download Citation

Jiang Bo, Weidong Hao, Zhihong Hu, and Fuguo Liu "Root cause analysis of oxide scale forming and shedding in high temperature reheater of a 200MW super high pressure boiler", Proc. SPIE 9794, Sixth International Conference on Electronics and Information Engineering, 979413 (3 December 2015); https://doi.org/10.1117/12.2203543

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