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首页> 外文期刊>Progress in Energy and Combustion Science >The implications of chlorine-associated corrosion on the operation of biomass-fired boilers
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The implications of chlorine-associated corrosion on the operation of biomass-fired boilers

机译：氯相关腐蚀对生物质锅炉运行的影响

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The design of new biomass-fired power plants with increased steam temperature raises concerns of high--temperature corrosion. The high potassium and chlorine contents in many biomasses are potentially harmful elements with regard to corrosion. This paper condenses the current knowledge of chlorine-induced, high-temperature corrosion and describes the potential corrosion problems associated with burning biomass fuels either alone or in blends with coal, for electricity production. Chlorine may cause accelerated corrosion resulting in increased oxidation, metal wastage, internal attack, void formations, and loose non-adherent scales. The partial pressure of HCl in a biomass-derived flue gas, is not high enough to cause severe gas- phase corrosion attacks, but may provide scale failure and increased sulfidation of water walls in areas where locally reducing conditions occur due to poor combustion and flame impingement. The most severe corrosion problems in biomass-fired systems are expected to occur due to Cl-rich deposits formed on superheater tubes. The presence of alkali chloride salts in deposits may cause accelerated corrosion well below the melting point of the salt. The corrosion can be severe in air but may be further enhanced by SO_2 which may cause intra-deposit sulfation of the alkali chlorides liberating HCl or Cl_2 gas close to the metal surface. In case the metal surface temperature becomes high enough for molten phases to form in the deposit, the corrosion may be even further enhanced.
机译：蒸汽温度升高的新型生物质电厂的设计引起了人们对高温腐蚀的关注。就腐蚀而言，许多生物质中的钾和氯含量高是潜在的有害元素。本文简述了当前由氯引起的高温腐蚀的知识，并描述了与单独燃烧生物质燃料或与煤混合使用的燃煤发电相关的潜在腐蚀问题。氯可能会导致腐蚀加速，从而导致氧化增加，金属浪费，内部侵蚀，空隙形成和松散的非附着水垢。源自生物质的烟道气中HCl的分压不够高，不会引起严重的气相腐蚀攻击，但在燃烧和火焰不佳导致局部还原的地区，可能会导致水垢破坏和水壁硫化增加撞击。预计由于在过热器管上形成的富含Cl的沉积物，生物质燃烧系统中最严重的腐蚀问题将会发生。沉积物中碱金属氯化物盐的存在可能导致加速腐蚀，腐蚀速率远低于盐的熔点。空气中的腐蚀可能很严重，但SO_2可能会进一步加剧腐蚀，这可能会导致碱金属氯化物在沉积物中发生硫酸化，从而释放出靠近金属表面的HCl或Cl_2气体。如果金属表面温度变得足够高以至于在沉积物中形成熔融相，则腐蚀甚至会进一步增强。

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