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Rates of fireside corrosion of superheater and reheater tubes: making sense of available data

机译：过热器和再热器管的炉边腐蚀率：根据可用数据

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摘要

Interpretation and use of a body of field data for corrosion of superheater and reheater (SH/RH) tubes in coal fired boilers was found to be unsatisfactory without some indication of how the corrosive environment encountered differed when different coals were burned. A new factor intended to represent the relative corrosion potential (RCP) of the coal burned is suggested, based on the accepted mechanism of accelerated corrosion of SH/RH tubes by the development of low melting complex sulphates beneath ash deposits. Initial testing of the RCP concept was encouraging, given the difficulty in some cases of ensuring accurate representation of the actual coal burned during the corrosion exposures. However, some data suggested that new boiler operating modes, such as various approaches to emissions reduction through staging of the combustion process, appeared to be capable of causing significantly more rapid corrosion of SH/RH tubes than would be expected from the RCP value for the coal. Although increased corrosion with some emissions control systems has been recognised in practice, understanding of the particular corrosion process involved is lacking. Some degree of mechanistic understanding of the key features of this form of corrosion is needed to provide a firm basis for application of concepts such as RCP or development of improved versions.
机译：人们发现，解释和使用大量现场数据来解释燃煤锅炉中过热器和再热器（SH / RH）管的腐蚀情况并不令人满意，而没有任何迹象表明燃烧不同的煤时所遇到的腐蚀环境如何不同。根据公认的SH / RH管加速灰化沉积物下方低熔点复杂硫酸盐的腐蚀机理，提出了一个新的因子来表示燃烧的煤的相对腐蚀电位（RCP）。考虑到在某些情况下难以确保准确表示腐蚀暴露期间燃烧的实际煤炭的难度，RCP概念的初步测试令人鼓舞。但是，一些数据表明，新的锅炉运行模式，例如通过分阶段进行燃烧过程减少排放的各种方法，似乎能够引起SH / RH管的腐蚀比从RCP值预期的要快得多。煤炭。尽管在实践中已经认识到某些排放控制系统会加剧腐蚀，但仍缺乏对涉及的特定腐蚀过程的了解。需要对这种腐蚀形式的关键特征有一定程度的机械理解，以便为诸如RCP或改进版本的开发等概念的应用提供坚实的基础。

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