摘要
在大量的农林业加工剩余物中,不同种类原料粉碎后的形状不同,其压缩成型特性有很大差异。以锯末、树叶和灌木细小枝条为原料,在同一模具下进行单模孔单向受压的离散元模拟,分析不同种类原料的成型质量和能耗。模拟结果表明:挤压成型后,锯末的接触数量达到8 327,高于其他两种原料。锯末颗粒的最大变形率为55%,灌木细小枝条为52%,树叶为49%。成型后锯末的孔隙率为19.03%,灌木细小枝条为24.72%,树叶为32.19%。根据变形率和孔隙率,得出锯末的成型质量最好,树叶的成型质量最差。这一结论与燃料的成型密度结果相对应。整个致密成型过程锯末、灌木细小枝条和树叶消耗的能量分别为30.84 J、19.76 J、15.12 J。模拟结果可以为生物质致密成型技术的发展提供理论依据。
In a large number of agricultural and forestry processing residues, raw materials of different types were pulverized in different forms. There compression molding characteristics were greatly different. Using sawdust, leaves and small branches of shrubs as raw material, we established a discrete element model of the raw material particles single mode uniaxial compression under the same mold. This paper analyzed mainly the forming quality and energy consumption of different kinds of raw materials. Hertz-Mindlin(no-slip) contact model was selected, and the initial conditions of particles and the contact parameters were set. The load was moved downwards after all the particles were generated. The simulation results showed that the contact number of sawdust reaches 8 327, which is higher than the other two raw materials after extrusion molding. The maximum deformation rate of sawdust particles is 55%, 52% for small branches of shrubs particles and 49% for leaves particles. After forming, the voidage of sawdust is 19.03%, 24.72% for small branches of shrubs and 32.19% for leaves. According to the deformation rate and voidage, the forming quality of the sawdust is the best, and the forming quality of the leaves is the worst. This conclusion corresponds to the forming density results of the molding fuel. The energy consumption by sawdust, small branches of shrubs and leaves is respectively 30.84 J, 19.76 J and 15.12 J in the entire dense forming process. The simulation results can provide a theoretical basis for the development of biomass dense molding technology.
作者
刘新泰
高雨航
李震
刘彭
Liu Xintai;Gao Yuhang;Li Zhen;Liu Peng(Department of Machine Engineering,Baotou Railway Vocational&Technical College,Baotout 014010,China;College of Machine Engineering,Inner Mongolia University of Science and Technology,Baotou,014010,China)
出处
《中国农机化学报》
北大核心
2019年第9期80-84,共5页
Journal of Chinese Agricultural Mechanization
基金
国家自然科学基金(51666016)
内蒙古自然科学基金(2016MS0544)
关键词
离散元
生物质
几何形状
成型质量
能耗
discrete element
biomass
geometrical shape
forming quality
energy consumption
