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Characterization of the Oxide Scale Formed on T12 Water Wall Tube After Long-term Service in Supercritical Power Plant

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Abstract

Oxide scale control is one of the critical maintenance issues in fossil fuel power plant. Hence, the water treatment of the feed water has been changed from all-volatile treatment (AVT) to oxygenated treatment (OT) by added some amount of oxygen in the system to form a stable oxide and minimize the scale growth rate. In this work, the oxide scales formed on T12 water wall tube after one cycle of chemical cleaning treatment under OT condition in a supercritical coal power plant were characterized by using various methods. It was found that the oxide scale formed on the inner surface of the tube had a multi-layer structure with a porous outer layer consisting of Fe3O4 and Cr-rich α-Fe2O3 oxides and a dense inner layer consisting of Cr-rich spinel oxide. A Cr- and Mn-enriched outermost layer was also observed. Cavities, pits, and exfoliation were observed in the oxide scales. The cavities and grain boundaries behaved as the short path of the diffusion of oxygen into the metal. Intergranular oxidation was observed between the inner layer of oxide scale and matrix. The distribution, morphology, and chemical compositional of these oxides were assessed and discussed from a point of view of the suitability of current chemical cleaning solution and procedure which has been used for AVT descaling.

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Acknowledgements

This work has been performed as a part of a joint program which is financially supported Tohoku Electric Power Co., Inc. The authors would like to thank Prof. Yutaka Watanabe and Assistant Prof. Hiroshi Abe of Tohoku University for fruitful discussion.

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Authors and Affiliations

  1. Frontier Research Initiative, New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aza-Aoba Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Xiangyu Zhong, Fethi Hamdani, Jian Xu & Tetsuo Shoji

  2. Tohoku Electric Power Co., Inc., Sendai, Japan

    Tadashi Tatsuki, Jun Morii, Wakako Sasaki & Yasunori Ishii

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  1. Xiangyu Zhong
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  2. Fethi Hamdani
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  3. Jian Xu
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Correspondence to Xiangyu Zhong.

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Zhong, X., Hamdani, F., Xu, J. et al. Characterization of the Oxide Scale Formed on T12 Water Wall Tube After Long-term Service in Supercritical Power Plant. Oxid Met 91, 705–727 (2019). https://doi.org/10.1007/s11085-019-09905-1

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  • DOI: https://doi.org/10.1007/s11085-019-09905-1

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