Development of SiO2/TiO2/Al2O3-based/TiO2 coating for preventing sulfide corrosion in thermal power plant boilers

Makoto Kawase*, Akifumi Ido, Masahiro Morinaga

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

In thermal power generation equipment, wall thinning on boiler tubes due to sulfide corrosion has been a problem. The methods for resolving or preventing the problem are coating of a nickel-chromium film by plasma spraying, weld cladding, and replacement of water wall tubing. These methods are expensive and time consuming. Therefore, an economical and straightforward coating technique was developed for preventing sulfide corrosion on boiler tubes. The developed coating has a four-layered structure comprising, in order from the boiler tube substrate, thin films of (1) a SiO2 layer, (2) a TiO2 layer, (3) an Al2O3-based layer, and (4) a TiO2 layer. The coating reduced corrosion to 25% or less compared with an uncoated part under a simulated condition (Gas: CO2/H2/N2/CO/H2O = 12%/4%/67%/8%/9% H2S 330 ppm, Temperature: 500 °C). It was found that the coating on boiler tubes is exceptionally durable and continues to be effective for more than 2 years in actual power plants. This coating process can be applied to a large area, and the work period is short. When the coating area is 100 m2, the working time is 3 days and total spraying time is only 7 h.

本文言語English
ページ(範囲)242-249
ページ数8
ジャーナルApplied Thermal Engineering
153
DOI
出版ステータスPublished - 2019 5 5

ASJC Scopus subject areas

  • エネルギー工学および電力技術
  • 産業および生産工学

フィンガープリント

「Development of SiO<sub>2</sub>/TiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>-based/TiO<sub>2</sub> coating for preventing sulfide corrosion in thermal power plant boilers」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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