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Study on enhanced torrefaction of elm with Mg(OH)2

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  • Gong, Jiapeng
  • Mei, Yanyang
  • Wang, Baojun
  • Zhang, Shan
  • Hou, Yuanhao
  • Hou, Jingfan
  • Lin, Guiying
  • Pang, Shusheng

Abstract

Torrefaction is a promising method for biomass pretreatment. However, there is an inconspicuous deoxygenation effect at lower temperature, while higher temperature torrefaction entails greater energy consumption. Additionally, 30 % of the carbon released during torrefaction is emitted as CO2. In order to enhance the deoxygenation effect of low-temperature torrefaction and reduce CO2 emissions during torrefaction, enhanced torrefaction experiments (220, 250 and 280 °C) with Mg(OH)2 as additive were carried out on a vertical furnace and a thermogravimetric mass spectrometry (TG-MS), respectively. The results both showed that Mg(OH)2 effectively enhanced the deoxygenation effect. Compared with T220, the O/C ratio of T2220, T1220 and T0.5220 decreased by 17.31 %, 21.16 % and 19.23 %, respectively, which also decreased significantly at 250 °C and 280 °C. The mass ratio of Mg(OH)2 had little effect on the deoxygenation effect. Furthermore, Mg(OH)2 could effectively absorb CO2, thus reducing CO2 emissions. Among them, the CO2 emissions of T2220 was only about 1/2 of that of T220 during torrefaction. This study might offer insights into optimizing energy efficiency and lessening CO2 emission during torrefaction.

Suggested Citation

  • Gong, Jiapeng & Mei, Yanyang & Wang, Baojun & Zhang, Shan & Hou, Yuanhao & Hou, Jingfan & Lin, Guiying & Pang, Shusheng, 2025. "Study on enhanced torrefaction of elm with Mg(OH)2," Renewable Energy, Elsevier, vol. 254(C).
    • Handle: RePEc:eee:renene:v:254:y:2025:i:c:s0960148125014648
    DOI: 10.1016/j.renene.2025.123800
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