Effectiveness of Inconel Overlaying Against Furnace Wall Damage （Sulfi dation Corrosion and Grooving Corrosion）

• Published in: THE THERMAL AND NUCLEAR POWER GENERATION CONVENTION COLLECTED WORKS Vol. 74; no. 5; pp. 9 - 15
• Main Authors: Miyazawa, Takayuki, Sakaguchi, Takashi, Ida, Keiji, Kawabe, Koji, Kodera, Sohei, Matsuno, June
• Format: Journal Article
• Language: Japanese
• Published: Thermal and Nuclear Power Engineering Society 19.05.2023; 一般社団法人 火力原子力発電技術協会
• Subjects: boiler; coal-fi red power plants; Furnace Wall Damage; Inconel Overlaying; Sulfi dation Corrosion and Grooving Corrosion; インコネル肉盛; ボイラ; 火炉壁損傷; 石炭火力; 硫化・溝状腐食
• ISSN: 2187-929X; 2187-929X
• DOI: 10.14942/tenpes.74.9

In coal-fi red power plants, sulfi dation corrosion and grooving corrosion damage the furnace wall tubes. These types of corrosion occur in a reducing atmosphere which is mainly due to hydrogen sulfi de (H2S) produced from the sulfur (S) content in coal in the high-heat load area of the furnace wall, which pose problems in periodic maintenance.To address this problem we established a technology of Inconel overlaying, which has numerous proven result in the United States and excels in corrosion resistance and reliability, as a measure to protect furnace wall tubes and applied it to a commercially operating unit in 2006. In this paper, we report on the many years of use of the boiler to which the technology was fi rst applied.