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首页> 外文期刊>Materials Letters >Anti-silica fouling coatings in geothermal environments
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Anti-silica fouling coatings in geothermal environments

机译：地热环境中的抗硅垢涂料

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An important key to a successful use of carbon steel-based heat exchanger tubes in geothermal binary-cycle power plants is to understand how to efficiently prevent the deposition on them of silica scales. These deposits are caused by the high sensitivity to silica of ferric oxide layer occupying the outermost surface sites of carbon steel. We evaluated the usefulness of two high-temperature performance coatings, polyphenylenesulfide (PPS) and polytetrafluoroethylene (PTFE)-blended PPS, in inhibiting silica scaling. To obtain this information, the coated steel panels were immersed for up to 7 days in 200℃ silica-rich brine. As a result, the surfaces of the unblended PPS coating underwent some degree of brine-induced oxidation. Although the amount of silica deposited was negligible, it was found that the sulfur-oxygen derivatives formed on the surfaces by oxidation make them susceptible to silica scaling. In contrast, the PTFE-blended PPS coating had a high potential as the anti-silica fouling barrier. The major reason for this was due to the segregation of anti-oxidant, hydrophobic PTFE top surface layer above a PPS layer in the coating.
机译：在地热二元循环电厂中成功使用基于碳钢的换热管的重要关键是要了解如何有效地防止二氧化硅垢在其上沉积。这些沉积物是由于占据碳钢最外层表面的三氧化二铁层对二氧化硅的高敏感性所致。我们评估了两种高温性能涂料（聚苯硫醚（PPS）和聚四氟乙烯（PTFE）混合PPS）在抑制二氧化硅结垢方面的有用性。为了获得此信息，将涂层钢板在200℃富含二氧化硅的盐水中浸泡7天。结果，未混合的PPS涂层的表面经历了一定程度的盐水诱导的氧化。尽管沉积的二氧化硅的量可以忽略不计，但是发现通过氧化在表面上形成的硫-氧衍生物使其易受二氧化硅垢的影响。相比之下，PTFE共混的PPS涂层作为抗二氧化硅结垢屏障具有很高的潜力。其主要原因是由于涂层中PPS层上方抗氧化剂，疏水性PTFE顶表面层的离析。

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