As a type of special biowaste, waste wood-based panels (WWPs) have a high nitrogen content and typical biomass defect properties, which limit their clean and efficient thermal utilization. An upgrading and denitrogenation procedure prior to thermal utilization is necessary, but the relevant mechanisms and characteristics have not been clearly elucidated. Torrefaction pretreatment of three typical WWPs (plywood, fiberboard, particleboard) was conducted to investigate the evolution of carbon and nitrogen functionalities in relation to the upgrading/denitrogenation procedure. The results demonstrated that the combined upgrading/denitrogenation of WWPs was possible. Under optimal operating conditions (300 °C and 10 min), the denitrogenation efficiency could reach 60–70 wt% with a slight energy loss of <30% and a high HHV (20–22 MJ/kg) of the corresponding torrefied products. The carbon functionality evolution (upgrading) was believed to be the continuous change from low-energy “CH/CO/CO” to high-energy “aromatic CC/CC”, which was related to the reactions of lignin (demethoxylation, chain scission and polycondensation), hemicellulose (deacetylation and degradation) and cellulose (degradation). The nitrogen functionality evolution (denitrogenation) was regarded as a conversion of amide-N into more stable heterocyclic-N (pyrrolic-N and pyridinic-N) through cross-linking reactions, together with a significant release of nitrogen containing gases (NH₃ and HCN).

中文翻译：

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废旧人造板的烘焙：从提质与脱氮性能的结合中进一步了解

作为一种特殊的生物垃圾，废人造板（WWP）具有较高的氮含量和典型的生物质缺陷特性，限制了其清洁和高效的热利用。在热利用之前需要进行升级和脱氮程序，但相关机制和特征尚未明确阐明。对三种典型的 WWP（胶合板、纤维板、刨花板）进行烘焙预处理，以研究与升级/脱氮程序相关的碳和氮官能度的演变。结果表明，WWPs 的联合升级/脱氮是可能的。在最佳操作条件下（300°C 和 10 分钟），脱氮效率可达到 60-70 wt%，而能量损失仅为 < 30% 和相应的烘焙产品的高 HHV (20–22 MJ/kg)。碳官能团的演化（升级）被认为是从低能“CH/CO/CO”到高能“芳香CC/CC”的不断变化，这与木质素的反应（脱甲氧基化、断链和缩聚）、半纤维素（脱乙酰和降解）和纤维素（降解）。氮官能度演化（脱氮）被认为是酰胺-N 通过交联反应转化为更稳定的杂环-N（吡咯-N 和吡啶-N），同时大量释放含氮气体（NH₃ 和 HCN） ）。这与木质素（脱甲氧基化、断链和缩聚）、半纤维素（脱乙酰化和降解）和纤维素（降解）的反应有关。氮官能度演化（脱氮）被认为是酰胺-N 通过交联反应转化为更稳定的杂环-N（吡咯-N 和吡啶-N），同时大量释放含氮气体（NH₃ 和 HCN） ）。这与木质素（脱甲氧基化、断链和缩聚）、半纤维素（脱乙酰化和降解）和纤维素（降解）的反应有关。氮官能度演化（脱氮）被认为是酰胺-N 通过交联反应转化为更稳定的杂环-N（吡咯-N 和吡啶-N），同时大量释放含氮气体（NH₃ 和 HCN） ）。