生物质焦表面形貌SEM研究

Study on surface of biomass chars by scanning electron microscopy

采用扫描电镜对生物质焦的表面形貌进行研究。扫描电镜实验结果表明,生物质在制焦后,表面粗糙度提高,比表面积增大,孔隙更加发达。焦样表面形貌的特征主要是由生物质种类决定的,在扫描电镜下,稻壳焦样表面有锯齿状不规则的突起,但是开口在表面的孔很少;树叶焦样表面有不规则的孔;玉米杆焦样有如同蜂窝状的表面结构,表面孔十分丰富;棉花杆焦样有着絮状的表面结构,表面孔也较明显。热解温度对焦样表面形貌的影响不大。

The surface of biomass chars was studied using Scanning Electron Microscopy.The study shows that,the surface coarseness of biomass char is enhanced after pyrolysis,and both the special surface area and the porosity of the char increase.The surface characteristics are determined by the kinds of the biomass chars.There are hackle protuberances on the rice shell char surface,but little pores opening to the surface.There are irregular pores on the leaf char surface.Many pores on the cornstalk char surface are like honeycomb,and many pores on the cotton stalk char surface are cottony.The pyrolysis temperature has little effect on the surface characteristics of biomass chars.