Thermal reaction mechanism of biomass and determination of activation energy
II.Pyrolysis section
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摘要: 在热重分析仪上研究了杉木木屑在不同升温速率下的热解过程，利用DAEM模型探讨了热解活化能随转化率的变化规律，采用傅里叶红外光谱仪分析了热解温度对木屑热解固体产物半焦有机结构的影响。结果表明，木屑慢速热解过程可分为干燥、过渡、热解和碳化段；热解段活化能为103kJ/mol~179kJ/mol，随转化率的升高而变化；温度低于200℃时，生物质内部官能团种类不变而强度变弱；随着温度的升高，半焦所含的有机官能团发生断裂、重组而快速减少，挥发分大量析出；温度高于500℃时，官能团种类较稳定，主要热解反应过程结束。Abstract: The pyrolysis characteristics and kinetics of fir sawdust were investigated via thermo gravimetric analysis at different heating rates. The distributed activation energy model (DAEM) was used to study the pyrolysis kinetics. The influence of temperature on organic structure of semi-char was analyzed by FT-IR. The pyrolysis of the samples was divided into four stages: extraction of water, transition, main pyrolysis and charring. As a function of conversion rate, the pyrolysis activation energies are between 103kJ/mol and 179kJ/mol. When the temperature is below 200℃, the function groups remain unchanged but a weaker intensity. With the increase of final temperature, the contained organic function groups in semi-char decrease greatly. When the temperature is above 500℃, the types of function groups remain unchanged and the main pyrolysis reaction process is completed.
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Key words:
- biomass /
- pyrolysis /
- activation energy /
- FT-IR
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