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Evaluation of slagging and fouling tendency during biomass co-firing with coal in a fluidized bed

机译:流化床中煤与生物质共烧过程中结渣和结垢趋势的评估

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摘要

Over the last decades, several indices based on ash chemistry and ash fusibility have been used to predict the ash behaviour during coal combustion, namely, its tendency for slagging and fouling. However, due to the physicalechemical differences between coals and biomass, in this work only the applicability of an ash fusibility index (AFI) to the combustion and co-combustion of three types of biomass (straw pellets, olive cake and wood pellets) with coals was evaluated. The AFI values were compared with the behaviour of ash during combustion in a pilot fluidized bed and a close agreement was observed between them. For a better understanding of the mechanisms associated with bed ash sintering, they were evaluated by SEM/EDS and the elements present on the melted ash were identified. Evidences of different sintering mechanisms were found out for the fruit biomass and herbaceous biomass tested, depending on the relative proportions of problematic elements. The particles deposited on a fouling probe inserted in the FBC were analyzed by XRD and the differences between the compounds identified allowed concluding that the studied biomasses present different tendencies for fouling. Identification of KCl and K2SO4 in the deposits confirmed the higher tendency for fouling of fruit biomass tested rather than wood pellets.
机译:在过去的几十年中,基于灰分化学和灰分易熔性的几个指标已用于预测煤燃烧过程中的灰分行为,即其结渣和结垢的趋势。但是,由于煤和生物质之间的物理化学差异,在这项工作中,仅将灰烬易熔性指数(AFI)用于三种类型的生物质(秸秆颗粒,橄榄饼和木屑颗粒)与煤炭的燃烧和共燃烧。被评估。将AFI值与中试流化床燃烧过程中的灰分行为进行了比较,观察到它们之间的一致性。为了更好地了解与粉煤灰烧结相关的机理,通过SEM / EDS对它们进行了评估,并鉴定了熔融灰中存在的元素。对于有问题的水果生物量和草本生物量,发现了不同烧结机制的证据,这取决于有问题元素的相对比例。通过XRD对沉积在插入FBC的结垢探针上的颗粒进行分析,鉴定出的化合物之间的差异可以得出结论,即所研究的生物质呈现出不同的结垢趋势。在沉积物中鉴定出的KCl和K2SO4证实了所测试的水果生物量比木屑更容易结垢。

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