Influence of torrefaction, hydrothermal carbonization and degradative solvent extraction pretreatments on moisture absorption and self-ignition characteristics of biomass
Influence of torrefaction, hydrothermal carbonization and degradative solvent extraction pretreatments on moisture absorption and self-ignition characteristics of biomass
复制标题
烘焙、水热碳化和降解溶剂萃取预处理对生物质吸湿和自燃特性的影响
DOI：
10.1016/j.fuel.2020.118843
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发表时间：
2020-12
期刊：
影响因子：
7.4
通讯作者：
Huang Yun
中科院分区：
文献类型：
--
作者：
Liu Man;Zhu Xianqing;Chen Rong;Liao Qiang;Xia Ao;Huang Yun
生物质的预处理主要有三种方法（烘焙、水热碳化和降解溶剂萃取），它们分别可以将生物质脱焦和提质为生物炭、水热炭和提取物，具有广泛的应用价值。然而，这三种预处理方法对生物质吸湿自燃特性的影响尚不清楚，这极大地影响了生物质炭、水热炭和提取物的后续储存、运输和利用过程。因此，本研究比较了生物质的焙烧、水热炭化和降解溶剂萃取对生物质吸湿和自燃特性的影响。结果表明，预处理产物（生物炭、水热炭和浸膏）的吸湿率分别为3.8%、1%和0.8%，明显低于RS的吸湿率（8%），表明生物炭、水热炭和浸膏的吸湿倾向均受到明显抑制。这些结果是由于在三种预处理过程中氧官能团的急剧去除造成的。生物炭和水热炭在300 °C以下的放热（6950 kJ/kg）明显高于RS（5950 kJ/kg），而提取物在300 °C以下的放热（5063 kJ/kg）远低于RS。与RS相比，生物炭和水热炭具有更高的比表面积和更高的无机金属元素含量，这是它们比RS具有更高自燃性能的原因。与此相反，萃取物具有致密的结构和极低的含氧官能团含量以及低无机金属元素含量，这共同导致其自燃敏感性低于RS。本研究为全面了解预处理对生物质吸湿自燃特性的影响机理提供了理论依据。
Three main pretreatment methods (torrefaction, hydrothermal carbonization and degradative solvent extraction) have been developed to deoxygenate and upgrade biomass into biochar, hydrochar and extract, respectively, which have a variety of high-value applications. However, the influence of the three pretreatment methods on the moisture absorption and self-ignition characteristics of biomass still remains unclear, which greatly affects the subsequent storage, transportation and utilization process of the biochar, hydrochar and extract. Therefore, the effects of torrefaction, hydrothermal carbonization and degradative solvent extraction on the moisture absorption and self-ignition characteristics of biomass were investigated and compared in this study. The results showed that the moisture absorption ratios of the pretreated products (biochar, hydrochar and extract) were as low as 3.8%, 1% and 0.8%, respectively, which was obviously lower than that of RS (8%), indicating that the moisture absorption propensities of biochar, hydrochar and extract were all obviously inhibited compared to RS. These results were caused by the dramatic removal of oxygen functional groups during the three pretreatment processes. The heat release of biochar (6950 kJ/kg) and hydrochar (7134 kJ/kg) below 300 °C were obviously higher than that of RS (5950 kJ/kg), while the heat release of extract (5063 kJ/kg) below 300 °C was much lower than that of RS. Compared with RS, biochar and hydrochar had higher specific surface areas and higher contents of inorganic metallic elements, which contributed to their higher self-ignition susceptibilities than those of RS. In contrast, the extract had a dense structure and extremely low oxygen functional groups contents as well as low inorganic metallic elements contents, which jointly led to its lower self-ignition susceptibility than that of RS. This research is expected to provide a comprehensive understanding of the influence mechanism of pretreatment on the moisture absorption and self-ignition characteristics of biomass.
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影响因子：
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作者：
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