主催: 日本エネルギー学会 石炭科学部会, 日本エネルギー学会 コークス工学研究部会
共催: 日本学術振興会 石炭・炭素資源利用技術第148委員会, 化学工学会 エネルギー部会, 日本エネルギー学会 重質油部会, 日本エネルギー学会 ガス化部会, 日本エネルギー学会 燃焼部会
会議名: 第53回石炭科学会議
回次: 53
開催地: 福山市生涯学習プラザ（広島県福山市）
開催日: 2016/10/26 - 2016/10/27
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 (CRIEPI 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. CRIEPI coating reduced corrosion to 25% or less compared with an uncoated part. It was found that CRIEPI coating on boiler tubes is exceptionally durable and continues to be effective for more than 2 years in actual power plants.
