Abstract Two pre-treatment techniques, water leaching and torrefaction, as well as a combination of these were applied to a variety of biomass wastes in order to get improved quality products in terms of composition, energy density and content of problematic inorganic constituents. Upgraded materials were blended with lignite and tested by thermogravimetric analysis. Devolatilization and combustion characteristics, thermal behaviour, reactivity and the role of ash were determined. The results showed that both pre-treatment methods improved the quality of biomass fuels, increased the FC/VM, decreased the H/C and O/C ratios, enhanced the energy density and provided materials with composition closer to the lignite, thus allowing better performance of the co-combustion process than that of raw blends. The slagging/fouling propensity of lignite/leached biomass mixtures was lowered. The combined leaching/torrefaction pre-treatment could facilitate the handling and feeding of fuels by delaying ignition and increase the reactivity and performance of the co-combustion process, but not to the same extent as solely torrefaction, because minerals removed by washing acted either as diluents or as catalysts during the thermal treatment.

中文翻译：

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联合预处理对各种生物质废物及其与褐煤混合物燃烧性能的影响

摘要 水浸和烘焙两种预处理技术以及它们的组合应用于各种生物质废物，以在成分、能量密度和有问题的无机成分含量方面获得更高质量的产品。升级后的材料与褐煤混合，并通过热重分析进行测试。测定了脱挥发分和燃烧特性、热行为、反应性和灰分的作用。结果表明，两种预处理方法都提高了生物质燃料的质量，增加了 FC/VM，降低了 H/C 和 O/C 比，提高了能量密度，使材料的成分更接近褐煤，从而使混合燃烧过程的性能优于原始混合物。褐煤/浸出生物质混合物的结渣/结垢倾向降低。浸出/烘焙联合预处理可以通过延迟点火来促进燃料的处理和进料，并提高共燃过程的反应性和性能，但与单独烘焙的程度不同，因为通过洗涤去除的矿物质既可以作为在热处理过程中用作稀释剂或催化剂。