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Materials degradation mechanisms in coal-fired boilers

机译：燃煤锅炉的材料降解机理

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摘要

The environmentally-induced degradation of materials operating at elevated temperatures in fossil-fired boilers may prove to be the most formidable obstacle standing in the path of the successful implementation of higher efficiency power generation systems. Corrosion and oxidation mechanisms are thermally activated processes, and the increased operating temperatures required to attain higher efficiencies in these power generation systems will limit the application of many materials that find extensive use in current equipment. Three of the major modes of materials degradation that are active in the existing fleet of coal-fired boilers in the US include: (1) accelerated sulfidation of waterwall tubing as a result of modified fuel combustion processes; (2) steam side oxidation; and (3) coal-ash corrosion. In this paper the current understanding of these corrosion phenomena will be reviewed and guidelines for future research approach will be outlined.
机译：在成功实施高效发电系统的过程中，化石燃料锅炉中在高温下运行的材料在环境中引起的降解可能是最严重的障碍。腐蚀和氧化机理是热活化过程，在这些发电系统中获得更高效率所需的工作温度升高将限制在当前设备中广泛使用的许多材料的应用。在美国现有的燃煤锅炉机队中，活跃的三种主要材料降解模式包括：（1）由于燃料燃烧过程的改进，加速了水冷壁管的硫化; （2）蒸汽侧氧化; （3）煤灰腐蚀。本文将对当前对这些腐蚀现象的理解进行回顾，并概述未来研究方法的指南。

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