Discussion on Feed-Water Treatment Technology of Supercritical Unit

Abstract:

The oxygenated feed-water treatment technology of supercritical unit can effectively decrease the corrosion of water-steam system, and thus steam-water quality and operating efficiency are greatly promoted. In view of modes of feed-water treatment technology for supercritical unit, the characteristics of oxide film in thermal system under AVT and OT conditions are compared; and then, the principle of oxygenated feed-water treatment technology was elaborated. Besides, the oxygenated conditions, controlling of water quality, advantages, the relation between formation of oxide scale and oxygen plus are analyzed. Finally, the paper introduced weak oxiding feed-water treatment technology, with the principle of low oxygen and high pH value.

• Periodical: Advanced Materials Research (Volumes 1092-1093)
• Pages: 831-837
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1092-1093.831
• Online since: March 2015
• Authors: Guo Hua Lu*, Qiao Ling Peng, Shun An Cao
• Keywords: AVT, Ot, Supercritical Unit, WOT

References

[1] Zhiping Zhu, Yan Zhou, Shengjie Kong. Chemical Technology of Supercritical Thermal Power Generating Units [M]. Beijing: China Electric Power Press, 2012. (In Chinese).

[2] lexander Y Superfin, Prabhat Kumar Sinha. Alternative Boiler feed-water treatment by using the oxygenated technique [J]. IWC, 1993, 53.

[3] Irma Dedekind, Denis Aspden, Ken J Gait, et al. Oxygenated feed-water treatment at the world's largest fossil fired power plant-beware of the pitfalls[J]. Power Plant Chemistry, 2001, 3(11).

[4] Lei He, Zhijie Liu, Xianwu Ning. The Research of Feed-water Oxygenated Treatment for ultra-supercritical unit [J]. Northeast Electric Power Technology, 2012, 33(1). ( In Chinese).

[5] Alexander Y. Superfin, Prabhat Kumar Sinha: Alternative Boiler Feed-water Treatment by Using the Oxygenated Technique. IWC-93-53.

[6] Irma Dedekind, Denis Aspden, KenJ. Galt, Dave DAlgetty: Oxygenated Feed-water Treatment at the World's Largest Fossil Fired Power Plant –Beware of the Pitfalls. Power Plant Chemistry, 2001, 3(11).

[7] Jianhua Li, Mincong Zheng, Sen Ai, Meibao Wang. Analysis of Cycle Chemistry factors of Flow-accelerated Corrosion in Fossil Power Plant [J]. 2010 Power Plant Chemistry Academic Conference Papers, 2010. (In Chinese).

[8] Zhihu Ai, Dingping Liu. Key Issues of Oxygenated Feed-water Treatment for Supercritical Boiler [J]. Electric Power; 2011, 44(3). (In Chinese).

[9] MCCLOSKEY T H, DOOLEY R B, MCNAUGHTON W P. Turbine steam path damage: theory and practice [M]. Electric Power Research Institute, Palo Alto, CA, (1999).

[10] I. G. Wright, R. B. Dooley. A review of the oxidation behavior of structural alloys in steam [J]. International Materials Reviews, 2010, 55(3): 129-167.

DOI: 10.1179/095066010x12646898728165

[11] Hong Xu. Mechanism of OT-induced Exfoliation of Duplex Scale in Steam Path. Journal of Chinese Society of Power Engineering. 2011, 31(9). (In Chinese).

[12] Wenlong Wu, Junfeng He, Changming Li. Growth and exfoliation of Mechanism of Oxide Scale on Alloys Exposed to Steam of Supercritical (Ultra-supercritical) Units [J]. Proceedings of the 2011 conference of chemical plant, 2011. ( In Chinese).

[13] Likui Feng, Zhouhai Qian, Chen Zhou. Experimental Research on Low-Oxygen Feed-water Treatment for Once-through Boilers [J]. Electric Power, 2013, 46(4). (In Chinese).