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Pyrolysis of torrefied herbal medicine wastes: Characterization of pyrolytic products

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  • Xin, Shanzhi
  • Huang, Fang
  • Qi, Wei
  • Mi, Tie

Abstract

Torrefaction is beneficial for improving the pyrolysis product quality. To study the feasibility of utilizing herbal medicine wastes (HMWs), pyrolysis of torrefied HMWs was performed. The effects of torrefaction on the properties of products and the evolution law were examined. The results show that the torrefaction temperature exerts a greater influence on the yield and quality of products from HMWs pyrolysis than that of the torrefaction atmosphere. CO was the predominant component in the gas, and its yield increased with both the torrefaction and pyrolysis temperatures. H2 and CH4 started to be released at ≥600 °C due to dehydrogenation and condensation reactions. Acids, ketones and anhydro-saccharides (AS) were the major compounds in bio-oil from 400 to 600 °C, while phenols, aromatics and N-containing compounds dominated at high temperatures. Torrefaction at high temperatures and under oxygenated atmospheres facilitated the formation of larger aromatic ring structures. Pyrolysis of torrefied HMWs under CO2 and O2 and 260 °C produced more CO, CO2 and acids but fewer phenols than that under N2. The obtained results are beneficial for the development of an effective utilization method for HMWs.

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  • Xin, Shanzhi & Huang, Fang & Qi, Wei & Mi, Tie, 2020. "Pyrolysis of torrefied herbal medicine wastes: Characterization of pyrolytic products," Energy, Elsevier, vol. 210(C).
    • Handle: RePEc:eee:energy:v:210:y:2020:i:c:s0360544220315632
    DOI: 10.1016/j.energy.2020.118455
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    References listed on IDEAS

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    Cited by:

    1. Huang, Shengxiong & Lei, Can & Qin, Jie & Yi, Cheng & Chen, Tao & Yao, Lingling & Li, Bo & Wen, Yujiao & Zhou, Zhi & Xia, Mao, 2022. "Properties, kinetics and pyrolysis products distribution of oxidative torrefied camellia shell in different oxygen concentration," Energy, Elsevier, vol. 251(C).
    2. Tang, Shouhang & Zhou, Sicheng & Li, Ge & Xin, Shanzhi & Huang, Fang & Liu, Xiaoye & Huang, Kai & Zeng, Lixi & Mi, Tie, 2023. "Combination of torrefaction and catalytic fast pyrolysis for aromatic hydrocarbon production from herbaceous medicine waste," Energy, Elsevier, vol. 270(C).

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