Diagnosis for Water and Steam Quality Problem in Taishan Ultra-Supercritical Power Plant

Abstract:

Water and steam quality during operation must be strictly controlled for ultra-supercritical unit. Changes of indicators in water and steam are supervised, water and steam quality and working condition of boiler water, as well as supervision of water and steam quality are reviewed in this paper. Risks of corrosion and scaling in Taishan power plant is assessed. As a result, control effect of TOC is remarkable in Taishan power plant, content of Cl^- and SO₄^2- can satisfy the control standard, that is , risk of corrosion and scaling is low. Dissolved oxygen is significantly exceeded in the condensate polishing desalination device , and there has risk of iron deposit. To convert the feed water treatment from AVT(All Volatile Treatment) to OT(Oxygenated Treatment) can solve the problems above .

• Periodical: Advanced Materials Research (Volumes 1044-1045)
• Pages: 291-294
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1044-1045.291
• Online since: October 2014
• Authors: Mao Dong Li*, Chen Lin Dai, Jun Ming Zhao, Yu Hui Du, Lin Yang, Fen Yu, Zhi Ping Zhu
• Keywords: AVT(All Volatile Treatment), Oxygenated Treatment (OT), Quality, Steam, Water

References

[1] Vladana N. Rajaković-Ognjanović, Dragana Z. Živojinovic, et al. Improvement of chemical control in the water-steam cycle of thermal power plants[J]. Applied Thermal Engineering, 2011, 31(1): 119-128.

DOI: 10.1016/j.applthermaleng.2010.08.028

[2] B. Dooley, R. Svoboda. Improving thermal cycle efficiency in advanced power plants: water and steam chemistry and materials performance[J]. Advanced Power Plant Materials, 2010, 31(1), 89-108.

DOI: 10.1533/9781845699468.1.89

[3] Sonja Vidojkovic, Antonije Onjia, et al. Extensive feedwater quality control and monitoring concept for preventing chemistry-related failures of boiler tubes in a subcritical thermal power plant[C]. Applied Thermal Engineering, 2013, 59(1-2): 683-694.

DOI: 10.1016/j.applthermaleng.2013.06.028

[4] Dooley R B, Larkin B, Webb L, et al. Oxygenated treatment for fossil [C]. International Water Conference 53, Pittsburgh, PA, (1992).

[5] Quadri G, Scolari P V, Scalari G P, et al. Combined water treatment(CWT) in oncethrough boiler: ENEL experience[C]. International Water Conference 51, Pittsburgh, PA, (1990).