秸秆微粉碎刀具结构设计与粉碎性能数值模拟  

Structure design and pulverizing performance numericalsimulation of straw micro-pulverizing cutter

作　　者：付敏[1] 高泽飞 陈效庆 王成梦 战明宇 曹众 Fu Min;Gao Zefei;Chen Xiaoqing;Wang Chengmeng;Zhan Mingyu;Cao Zhong(College of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学机电工程学院,黑龙江哈尔滨150040

出　　处：《可再生能源》2024年第10期1279-1288,共10页Renewable Energy Resources

基　　金：国家自然科学基金项目(51975114)。

摘　　要：为提高秸秆微粉碎的碎裂率以及粒度均匀性和稳定性,文章针对秸秆物性提出了动、定刀冲击和剪切的复合粉碎方式,设计了一种弧形锯齿刃粉碎刀具。通过对秸秆粉碎过程中受到的剪切、冲击作用进行力学和动力学分析,明确了影响秸秆粉碎性能的主要因素及碎裂方式。基于EDEM数值模拟,对比分析了锯齿刃型和光刃型刀具对秸秆粉碎性能的影响,模拟结果表明:在粉碎含水率为20%的玉米秸秆时,相较于光刃型刀具,锯齿刃型刀具的颗粒粘结键数量减少了16.76%、颗粒运动速度提高了15.9%、颗粒总能量增大了25.05%、对粉碎室壁的冲击力减小了33.69%,工作状态更加平稳,能耗更低。To improve the fragmentation rate,particle size uniformity,and stability of straw micro-pulverization,a composite pulverizing method of moving and fixed cutter impact shear was proposed for the physical properties of straw,and a curved serrated blade pulverizing cutter was designed.The main factors affecting the pulverizing performance of straw and the way of fragmentation were clarified through the analysis of the shear mechanics of straw,the analysis of impact dynamics,and the mechanical analysis of pulverizing moving cutter.Based on EDEM numerical simulation,the effects of the serrated blade and smooth blade cutters on the pulverizing performance of straw were compared and analyzed.The simulation results show that when pulverizing corn straw with a moisture content of 20%,the number of connective keys of the serrated blade is 16.76%less than that of the smooth blade,the particle motion speed is increased by 15.9%,the total energy of particles is increased by 25.05%,and the impact force on the pulverizing chamber wall is reduced by 33.69%,and has a smoother working condition and lower energy consumption.

关 键 词：秸秆 微粉碎 刀具 粉碎性能 数值模拟 

分 类 号：TK6[动力工程及工程热物理—生物能] TH122[机械工程—机械设计及理论]