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The influence of potassium-rich biomass ashes on steel corrosion above 550°C

机译：富含钾的生物质灰烬对550°C以上钢腐蚀的影响

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The slagging, fouling and high temperature corrosion are major problems in biomass-firing units and lead to heat transfer limitation, bed agglomeration and metal surface degradation. This paper reports the results of the laboratory-scale corrosion studies of selected steel grades (16Mo3, 10CrMo9-10, X10CrMoVNb9-1, X7CrNiNb18-10) under biomass ash deposits. Five biomass ashes (3 agricultural biomass and 2 energy crops) were used for corrosion tests. Selected samples were doped with 0.1 and 0.5% wt. of KCl to simulate salt condensation process occurring in a real boiler. The corrosion experiments were carried out under oxidizing conditions, at 560 degrees C and 610 degrees C for 168 h. To determine the corrosion rate the mass of steel samples were measured after 24, 72 and 168 h. The corrosion products were analysed using SEM-EDS technique. The results showed that oxide scale formation rate determines the overall corrosion mechanism and the influence of ash deposits on steel. For low-chromium steels the oxidation rate is significant and a scale is a protective barrier between the deposit and metal surface limiting further oxidation process. The highest influence of ash on corrosion process was observed for high-chromium steels. However, high-chromium steels show the highest corrosion resistance.
机译：熔渣，污垢和高温腐蚀是生物质烧制单元中的主要问题，导致传热限制，床凝聚和金属表面降解。本文报告了生物质灰沉积物下所选钢等级（16MO3，10CrMO9-10，X10CrMovNB9-1，X7CrNINB18-10）的实验室规模腐蚀研究的结果。五种生物质灰（3种农业生物量和2个能量作物）用于腐蚀试验。选择的样品掺杂0.1和0.5％wt。 KCL模拟真实锅炉中的盐凝固过程。腐蚀实验在氧化条件下进行，在560℃和610℃下进行168小时。为了确定腐蚀速率，在24,72和168小时后测量钢样品的质量。使用SEM-EDS技术分析腐蚀产物。结果表明，氧化物尺度形成率决定了整体腐蚀机制和灰沉积物对钢的影响。对于低铬钢，氧化速率显着，尺度是沉积物和金属表面之间的保护屏障，其限制了进一步的氧化过程。为高铬钢观察到灰分对腐蚀过程的最高影响。然而，高铬钢呈现最高的耐腐蚀性。

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