典型生物质剪切破碎生成颗粒的形状特征  

RESEARCH OF SHAPE CHARACTERISTICS OF TYPICAL BIOMASS PARTICLES GROUND BY SHEAR METHOD

作　　者：郭强[1] 陈雪莉[1] 周金豪[1] 刘海峰 

机构地区：[1]华东理工大学煤气化教育部重点实验室,上海200237

出　　处：《太阳能学报》2011年第9期1375-1380,共6页Acta Energiae Solaris Sinica

基　　金：教育部长江学者与创新团队发展计划(PCSIRT-IRT0620);2008年度教育部新世纪优秀人才支持计划(NECT-08-0775)

摘　　要：借助光学显微镜和Image J图像处理软件,运用统计方法和分形理论对芦苇、稻秆、豆秸及松木4种生物质经剪切破碎后的颗粒的形状特征进行研究。结果发现:随着粒径的减小,生物质颗粒的长宽比及不同生物质颗粒长宽比之间的差异均变小。芦苇、稻秆、豆秸及松木4种生物质颗粒粒度为0.180～0.425mm时,平均长宽比分别为9.82、9.00、7.01和3.01,差异较大;粒度为0.096～0.125mm时,平均长宽比较接近,分别为2.42、2.70、2.59和2.49。4种生物质颗粒具有分形特性,在所研究的粒径范围内,分形维数处于0.8～0.9之间,且4种颗粒的分形维数随颗粒粒径的减小表现出减小趋势,但是松木颗粒的变化相对较小。Four kinds of biomass, reed, straw, bean haulm and pine were ground by shear method, respectively. And with microscope and image processing software Image J, the two-dimensional images of these particles were analyzed. As well as the average aspect ratio of each kind of biomass particles, the difference of average aspect ratios of four kinds of biomass particles was reduced when the particle size decreased. The average aspect ratios of reed, straw, bean haulm and pine particles were 9.82, 9. O. 425mm,which were different obviously. But when 00, 7.01 and 3.01 in the particle size range of 0. 180- the particle size range was 0. 096-0. 125ram, the average aspect ratios of four kinds of biomass particles which were much closed were 2.42, 2.70, 2.59 and 2.49, respectively. It was also found that the shape of the biomass particles could be described by fractal dimension, and the fractal dimension was between O. 8 and 0. 9, and the fractal dimensions of biomass particles were reduced when the particle size decreased, in addition, the change of fractal dimension of pine particles was relatively minor.

关 键 词：生物质 颗粒形状 长宽比 分形维数 

分 类 号：TK6[动力工程及工程热物理—生物能]