切碎农作物秸秆理化特性试验

Physical and Chemical Characterization of Biomass Crushed Straw

选取我国粮食主产区的玉米秸秆及华北地区的7种农作物秸秆为研究对象,采用生物质原料测试方法、标准试验研究了用于生产生物质压块燃料的切碎物料(粒度为5～30 mm)的理化特性。试验结果表明,不同地区的玉米秸秆理化特性差异较大,东北地区的静态堆积角最大,堆积密度最小,比其他地区平均低17.25%,灰分含量最低;同一地区的不同农作物秸秆的理化特性存在显著差异,玉米秸秆和棉秆的动态外摩擦角显著差异高于其他秸秆,豆秸、棉秆、花生壳的堆积密度最高。

The physical and chemical characterization of biomass crushed straw （practical size from 5 mm to 30 mm） which from major grain producing areas was studied and analyzed according to the biomass standards and methods introduced here. The results showed physical and chemical characterization of corn straw from different areas has significant difference. For northeast area, the static angle of repose was maximum, the ash was minimum and bulk density was 17.25% , lower than that of other area. The physical and chemical characterization of different straw from the same area has significant difference, too. The dynamic external friction angle of corn and cotton straw was much higher than that of other crop straw, for bulk density, the soybean, cotton and peanut straw was maximum. The model of net calorific value and proximate analysis was developed. The verification results showed that the largest regression coefficient P value was less than 0. 05.