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Flue gas torrefaction integrated with gasification based on the circulation of Mg-additive

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  • Yan, Beibei
  • Li, Songjiang
  • Cao, Xingsijin
  • Zhu, Xiaochao
  • Li, Jian
  • Zhou, Shengquan
  • Zhao, Juan
  • Sun, Yunan
  • Chen, Guanyi

Abstract

Flue gas torrefaction (FGT) is a feasible way to improve fuel properties and enhance gasification performance. Torrefaction inevitably causes CO2 emissions. In this study, FGT integrated with gasification based on the circulation of Mg-additive (MgO-FGT-GS) was developed to capture CO2 released during FGT and transferred it to gasification to achieve a higher effective carbon conversion efficiency (ECC). Firstly, FGT with Mg-additive (MgO-FGT) was conducted on distilled spirits lees (DSL) and the effect of different Mg-additive (MgO) ratios was explored. Based on the characterizations of DSL and Mg-additive before and after MgO-FGT, the mechanism of MgO-FGT was revealed, and the looping property of Mg-additive was investigated. A fixed-bed gasification experiment was finally performed to validate the MgO-FGT-GS process. The results show that the optimal MgO-FGT was obtained as the MgO: DSL ratio was 1:1. Under this condition, the torrefied DSL had the highest HHV of 16.20 MJ/kg and the lowest O/C ratio. In MgO-FGT, the MgO absorbed 15.75 % of CO2 and changed into basic magnesium carbonate. Then in gasification, CO2 was released by Mg-additive at 800 ℃, and the Mg-additive largely returned to MgO. The LHV of syngas of the MgO-FGT-GS was 9.22 MJ/Nm3, which was 1.3 times higher than raw DSL. Meanwhile, the tar yield decreased by 68.99 %, and the ECC increased by 1.5 times. Therefore, the MgO-FGT-GS process shows a great improvement in gasification and better utilization of CO2. This study provides a technological breakthrough for the full-component utilization and low-carbon conversion of biomass.

Suggested Citation

  • Yan, Beibei & Li, Songjiang & Cao, Xingsijin & Zhu, Xiaochao & Li, Jian & Zhou, Shengquan & Zhao, Juan & Sun, Yunan & Chen, Guanyi, 2023. "Flue gas torrefaction integrated with gasification based on the circulation of Mg-additive," Applied Energy, Elsevier, vol. 333(C).
  • Handle: RePEc:eee:appene:v:333:y:2023:i:c:s0306261922018694
    DOI: 10.1016/j.apenergy.2022.120612
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    References listed on IDEAS

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