【摘要】 建立了一种新的快速等温测定半焦炭-CO2反应性实验方法。在800℃下分别测定由落下床得到的生物质快速热解半焦炭和由钢甑得到的生物质慢速热解半焦炭与CO2气化反应的速率常数,以此作为半焦炭反应性的评价指标。作为对比研究,同时测定了木炭、石油焦和冶金焦的反应性,并考察了半焦炭比表面积和反应性的关系。实验结果表明,改进的等温测定半焦炭-CO2气化反应性实验方法具有快速、简便的优点,能准确反映半焦炭反应性变化的趋势。生物质热解半焦炭具有良好的反应性,是优质的气化和燃烧原料。在实验温度范围内,生物质半焦炭的反应性随热解温度的升高而呈增大趋势。生物质半焦炭的比表面积也随着热解温度增大而呈增加趋势,但增幅不大。更多还原

【Abstract】 A new method was developed for measuring the reactivity of char from biomass pyrolysis. The reactivities of chars from rapid pyrolysis in a free-fall reactor and slow pyrolysis in a steel jar were studied at 800℃. Similar experiments were carried out with charcoal, petroleum coke and metallurgic coke for comparative study. The relationship between reactivity and surface area of the char was also investigated. Results showed that the new method is simple and works well. The reactivities of the char from biomass pyrolysis are a little lower than that of charcoal, but mostly higher than those of petroleum coke and metallurgic coke. The chars are suitable for gasification and combustion. Surface area of the chars increase slightly with the increase of pyrolysis temperature. Both characteristics of raw material and heating rate affect the reactivity and surface area of the char.更多还原