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LIU Liang, LI Wenhao, LIU Zenghui, QING Mengxia, ZHAO Guangmin, LIU Wenbin. STUDY ON CHEMICAL STRUCTURE EVOLUTION AND REACTIVE MECHANISM OF BIOMASS CHAR PREPARED IN CO2/H2O ATMOSPHERE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 108-115. doi: 10.13205/j.hjgc.202304015
Citation: LIU Liang, LI Wenhao, LIU Zenghui, QING Mengxia, ZHAO Guangmin, LIU Wenbin. STUDY ON CHEMICAL STRUCTURE EVOLUTION AND REACTIVE MECHANISM OF BIOMASS CHAR PREPARED IN CO2/H2O ATMOSPHERE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 108-115. doi: 10.13205/j.hjgc.202304015

STUDY ON CHEMICAL STRUCTURE EVOLUTION AND REACTIVE MECHANISM OF BIOMASS CHAR PREPARED IN CO2/H2O ATMOSPHERE

doi: 10.13205/j.hjgc.202304015
  • Received Date: 2022-08-30
    Available Online: 2023-05-26
  • Publish Date: 2023-04-01
  • With rice straw(RS) as the research object, the effects of CO2/H2O atmosphere on biomass yield, structure and reactivity of RS in the process of volatilization were investigated. Fourier transform infrared spectroscopy (FTIR)and Raman spectroscopy (Raman) were used to characterize the RS char, and the evolution law of the microchemical structure of RS char under different reaction atmospheres was investigated. The combustion reactivity of RS char was analyzed by a thermogravimetric analyzer (TGA), and the effects of CO2 atmosphere, H2O atmosphere and CO2/H2O mixture atmosphere on the microstructure evolution and reaction mechanism of RS char were revealed. The results showed that the yield of biomass char decreased with the increase of final reaction temperature in CO2/H2O atmosphere, and the difference of yield of biomass char was obvious when the reaction temperature was above 700 ℃. CO2/H2O mixture atmosphere was more conducive to the consumption and condensation of the small aromatic ring system of biomass char. CO2 atmosphere and H2O atmosphere had a synergistic effect and competitive relation in the reaction of biomass char at high temperature. CO2/H2O atmosphere could improve the combustion characteristics of biomass char when the char-making temperature was 700 ℃ above.
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