摘要
利用傅里叶红外光谱仪（FTIR）和N2等温吸附/脱附法及扫描电镜对生物质半焦化学组成官能团的演变规律和孔隙结构特性进行表征,探讨生物质种类和制焦条件对热解半焦特性的影响。结果表明,热解温度的升高,半焦内部芳香结构增加,各官能团的数量和种类逐渐减少。不同生物质种类的半焦,吸附曲线差别较大。玉米秸秆半焦和松木屑半焦中主要以微孔为主,稻壳半焦以中孔分布较多,且600℃下半焦的孔隙结构变化最大。四种热解温度下半焦的分形维数范围为2.52～2.57,其中600℃下半焦的分形维数最大,吸附性能最强。随着热解温度的升高,生物质焦颗粒先后经历表面突起、突起破裂形成许多孔隙、孔隙变大等过程。
Using fourier infrared spectrometer（FTIR）and N2 isothermal adsorption/stripping method and scanning electron microscopy to characterize the biomass char functional groups evolution law and the pore structure characteristics,and discuss the types of biomass and the prepared conditions for the influence of char properties.Results shown that pyrolysis temperature increases,char carbonation degree deepened,the number and variety of functional groups gradually reduced.The different kinds of biomass chars had a greater difference between the adsorption curve.The particles of the corn stover char and pine sawdust char are mainly composed of micro hole,the middle pore distribution is more in the rice husk and the pore structure change is the largest at 600℃.The range fractal dimension of the char samples under the four pyrolysis temperature of is 2.52～2.57,and the fractal dimension of the char at600℃is largest,the adsorption performance of biomass char is biggest.With the increase of pyrolysis temperature,the char particles successively experienced surface protrusions,bump broken many pore space and pore greaten.
出处
《中国农机化学报》
2016年第7期199-204,272,共7页
Journal of Chinese Agricultural Mechanization
基金
东北电力大学博士科研启动基金(BSJXM-201309)
关键词
生物质半焦
热解终温
孔隙结构
官能团
分形维数
biomass char
final pyrolysis temperature
pore structure
functional groups
fractal dimension
