热解终温度对生物质半焦结构特性的影响

Effect of pyrolysis temperature on the structure characteristics of biomass semi-cokes

中文关键词: 半焦  比表面积 孔隙结构  吸附/脱附  分形维数

英文关键词: semi-coke  surface area  pore structure  adsorption/desorption  fractal dimension

中文摘要:

      利用固定床制备了不同终温下的生物质半焦,分别采用热重分析仪、扫描电镜、比表面积及孔径分析仪对半焦的燃烧特性、孔隙结构、热解过程中半焦孔隙结构变化规律等进行分析,并采用分型FHH(Frenkel-Halsey-Hill)方程对实验数据进行拟合计算。结果表明：热解制焦终温越高,半焦在空气气氛下燃烧的碳转化率越低；600 ℃热解制备的半焦表面最粗糙,孔隙最大；另外,热解制焦终温越高,半焦表面越粗糙,半焦吸附性能越强,且分形维数D_FHH越大。

英文摘要:

      Biomass semi-cokes with different final pyrolysis temperature were prepared by using a fixed bed. The combusition characteristics, pore structure and pore structure variation during the pyrolysis process were analyzed by the thermo gravimetric analyzer, scanning electron microscope and surface area and pore size analyzer, respectively. Moreover, FHH (Frenkel-Halsey-Hill) equation was employed to fit calculation the experimental datas. The results indicated that the higher pyrolysis temperature had the lower carbon conversion rate of the biomass semi-coke. Futhermore, the biomass semi-coke pyrolyzed at 600 _oC possessed the most rough surface and the largest pore structure. In addition, the higher pyrolysis temperature of the biomass semi-coke is, the higher rough surface, stronger adsorption capacity and greater fractal dimension D_FHH are.