摘要
利用同步热分析仪,采用程序升温法研究了生物质焦CO_2气化反应速率特性,主要考察了升温速率对生物质焦气化反应性的影响,并用Friedman-Reich-Levi法对其动力学参数进行了计算。结果表明:DTG曲线峰值温度和最大反应速率随着升温速率的增大而增大;以二氧化碳作保护气,改变升温速率,当升温速率为15℃/min时,热解得到的生物质焦的反应活性最好,即气化速率最快;升温速率越大,反应速率随着温度的变化越明显;生物质焦气化阶段的活化能在-4 984.41~1 408.39 k J/mol之间变化,气化的反应过程复杂。
The kinetics of biomass char CO2 gasification reactivity at high temperature was investigated via the temperatureprogrammed thermogravimetry with thermal analyzer,the influence of heating rates on gasification reactivity was studied and the kinetic parameters were calculated by Friedman-Reich-Levi method. The results showed that along with the increase of heating rate,the peak temperature of DTG curves and the maximum reaction rates increased. With carbon dioxide as shielding gas,changing the heating rate to 15 ℃/min,pyrolysis biomass char owned the best reactivity. The higher the heating rate was,the more obvious the reaction rate changed with the temperature. The activation energies of biomass char gasification stage were-4 984. 41-1 408. 39 k J/mol,which indicated biomass char CO2 gasification reaction process was complicated.
出处
《生物质化学工程》
CAS
北大核心
2017年第6期38-42,共5页
Biomass Chemical Engineering
基金
云南省院士自由探索基金(2015HA016
2016HA011)
