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A mechanism investigation of synergy behaviour variations during blended char co-gasification of biomass and different rank coals

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  • Wei, Juntao
  • Gong, Yan
  • Guo, Qinghua
  • Chen, Xueli
  • Ding, Lu
  • Yu, Guangsuo

Abstract

Co-gasification reactivity of rice straw and bituminous coal/anthracite blended chars under CO2 atmosphere was evaluated using thermogravimetric analysis, and the influences of coal type and gasification temperature on synergy behaviour variations on co-gasification reactivity as carbon conversions increased were quantitatively studied. Furthermore, the chemical forms and concentrations of AAEM species at different co-gasification conversions were quantitatively analyzed for revealing co-gasification synergy mechanism. The results demonstrate that as conversions increased, synergy behaviour on co-gasification reactivity of rice straw-bituminous coal blends was shown as the weakened inhibition effect firstly and then the enhanced synergistic effect. Moreover, the inhibition effect on co-gasification reactivity of rice straw-bituminous coal blends was sustained up to higher conversion with the increment of gasification temperature. Differing from rice straw-bituminous coal blends, synergistic effect on co-gasification reactivity of rice straw-anthracite blends was obviously enhanced at early stage of co-gasification and started to slowly weaken after reaching the most significant synergistic effect at middle stage of co-gasification. Additionally, it was revealed that synergy behaviour variations on co-gasification reactivity of rice straw-bituminous coal blends were mainly attributed to the combination effects of active K and Ca transformation during co-gasification, while those of rice straw-anthracite blends indicated a good correlation with active K transformation during co-gasification.

Suggested Citation

  • Wei, Juntao & Gong, Yan & Guo, Qinghua & Chen, Xueli & Ding, Lu & Yu, Guangsuo, 2019. "A mechanism investigation of synergy behaviour variations during blended char co-gasification of biomass and different rank coals," Renewable Energy, Elsevier, vol. 131(C), pages 597-605.
    • Handle: RePEc:eee:renene:v:131:y:2019:i:c:p:597-605
    DOI: 10.1016/j.renene.2018.07.075
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