【摘要】 通过对生物质理化特性和热解机理的深入分析,建立了高温条件下生物质热解模型。耦合生物质热解化学反应动力学方程和传热方程,用四阶龙格库塔法和三角追赶法求解,并将计算结果与文献中的实验数据进行对比。模拟结果表明:在径向位置颗粒中心温度的增加速率比表面的增加速率高;随着颗粒粒径的增加,生物质热解完成所需的时间加长;大分子焦油在1273K以上才开始快速裂解,温度越高裂解速率越快,当温度达到1673K时,大分子焦油几乎裂解完全。更多还原

【Abstract】 Through analysing the physico-chemical characteristics and pyrolysis mechanism of biomass deeply,biomass pyrolysis model under high temperature was built.Coupling the heat transfer equation with the chemical kinetics equations and solving them numerically using the fourth order Runge-Kutta and TDMA method,and the computation results were compared with experimental date.The simulation results shown that temperature rate of increase is high at the radial position close to face compared to that at the centre of the particle;As the particle radius increases, the time of completion of pyrolysis increases;Macromolecular tar begin to fast pyrolysis when ambient temperature reach 1273K,and as the temperature is higher,the tar pyrolysis rate is faster,when temperature come to 1673K,the macromolecular tar is almost cracked completely.更多还原