粉碎秸秆类生物质原料物理特性试验

为分析秸秆类生物质原料的物理特性,该文选取自然晾晒后(全水分8%左右)的6种不同地区玉米秸秆和5种不同种类秸秆,细粉(粒度0～10mm)后进行物理特性研究。结果表明,粉碎秸秆的自然和振实堆积密度范围分别在37.43～140和48.40～200kg/m3之间,静态和动态堆积角分别在44°～51°和17°～31°之间,与金属、橡胶材料的最大静摩擦系数分别在0.45～0.55和0.51～0.62之间,内摩擦系数在0.53～0.73之间。不同地区玉米秸秆和不同种类秸秆的堆积密度和堆积角均不同,秸秆品种和原料的均匀度对堆积密度有影响,不同种类秸秆堆积密度差异较大。原料的全水分越高,堆积角越大。摩擦特性和流动特性无明显差异。这说明在秸秆原料的压缩、输送、储存等相关装备及工艺路线的设计中,应充分考虑不同地区、不同种类的秸秆原料堆积特性的差异性。该研究为秸秆类生物质原料的利用提供基础数据支撑。

Experimental study on physical property of smashed crop straw

6 kinds of corn straws from different areas and 5 kinds of different crop straws were dried naturally and grinded into powder with diameters of 0-10 mm to study the physical properties of the crop straws. The results showed that densities of the natural and compressed crop straws were 37.43-140 kg/m3 and 48.40-200 kg/m3 respectively, the static and dynamic stacking angles were 44°-51° and 17°-31° respectively. The static friction coefficient between crop straws and metal or rubber was 0.45-0.55 or 0.51-0.62, and the coefficient of internal friction was 0.53-0.73. The stacking angles and the bulk densities were different for different kind of the crop straws or straws from different areas. The bulk density was affected by the kind and the uniformity of the crop straws. The difference of bulk density between different kinds of crop straws was very huge. The more the water was in the crop straws, the bigger the stacking angle was. There was no change of the friction coefficient and flow property. It could be inferred that the difference of the area and the kind of the crop straws should be fully considered when the crop straws were compressed, delivered and stored. This study can provide basic data support for the use of crop straws.