Abstract The waste cotton stalk (CS) and wood sawdust (WS) biomass samples pretreated by two different thermal methods (dry torrefaction (DT) and hydrothermal treatment (HT) at 200, 230, 260 °C, respectively) were densified to prepare biomass briquette and then carbonized at 400 °C to prepare charcoal briquette without any binders. The physical properties and combustion characteristics of the derived charcoal briquettes were investigated to assess the feasibility of its application as barbecue charcoal. The results indicate that the physical properties including the mass densities and compressive strengths of HT charcoal briquettes are better than those of DT and unpretreated charcoal briquettes, even those of the commercial barbecue charcoal with binder addition. Moreover, the fixed carbon and ash yields of the resulted HT charcoal briquettes meet the European Standard on commercial barbecue charcoal. Especially HT charcoal briquettes has far lower ash yield than the commercial barbecue charcoal. HT charcoal briquettes have similar combustion character index ( S ) with the commercial barbecue charcoal. In the research, CS and WS hydrothermal pretreated at 230 °C are the best materials for the charcoal briquette preparation process.

中文翻译：

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水热预处理生物质废弃物制备高强度炭块

摘要 通过两种不同的热方法（分别在 200、230、260 °C 下干法烘焙 (DT) 和水热处理 (HT)）对废棉秆 (CS) 和木屑 (WS) 生物质样品进行致密化制备生物质煤球，然后在 400 °C 下碳化以制备没有任何粘合剂的木炭煤球。研究了衍生木炭块的物理性质和燃烧特性，以评估其作为烧烤木炭应用的可行性。结果表明，HT 炭块的质量密度和抗压强度等物理性能优于 DT 和未经预处理的炭块，甚至是添加粘合剂的商业烧烤炭的物理性能。而且，得到的HT木炭煤球的固定碳和灰分产量符合欧洲商业烧烤木炭标准。特别是HT木炭的灰分产量远低于商业烧烤木炭。HT 炭块具有与商业烧烤炭相似的燃烧特性指数 (S)。在研究中，在 230 °C 水热预处理的 CS 和 WS 是炭块制备过程的最佳材料。