摘要：为了研究生物质粉碎的机理和优化粉碎参数,利用冲击磨在不同给料量下粉碎不同含水率的木屑,通过对样品平均粒径、特征粒径、形貌、单位能耗以及磨机的最大处理能力的分析,探索生物质粉碎的机理,通过综合考虑粉碎比和单位能耗来优化粉碎的参数。结果表明:特征粒径和平均粒径分别约为625、470μm,并随给料量增加先增加后减小;冲击磨的最大处理能力在14~22 kg/h范围内,且随着原料含水率的增加呈近似线性下降趋势;单位能耗约为100~400 kWh/t,且随含水率的增加而增加;冲击磨的粉碎主要方式随给料量的增加逐渐由冲击粉碎变为摩擦粉碎;木屑断裂方式随着水分含量的增加逐渐由脆性断裂转变为韧性断裂。

关键词： 生物质;冲击磨;粉碎机理;参数优化

Abstract： To investigate the pulverizing mechanism and optimize the pulverizing parameters， the impact mill was used to pulverize woody biomass with different moisture contents at different feed rates. The characteristic particle size， average particle size， specific energy consumption， surface topography and the maximum capacity were measured and analyzed. Size reduction ratio and specific energy consumption were both taken into consideration to optimize the pulverizing parameters. The results showed that the characteristic particle size and average particle size was 625， 470 μm， respectively， and both of them increased firstly and then decreased with the increase of feed rate. The maximum capacity of the impact mill was in a range from 14 kg/h to 22 kg/h， and decreased linearly with the increase of the moisture content. The pulverizing mechanism of the mill changed from impact grinding to friction grinding with the increase of feed rate， the breaking method of the wood biomass changed from brittle fracture to tough fracture with the increase of moisture content. 

Keywords： biomass； impact mill； pulverizing mechanism； optimizing parameter