摘要
筒仓结构影响仓内颗粒流动状态的同时,筒仓卸料过程中颗粒的流动特性也威胁到筒仓结构的安全性。为观察筒仓卸料时颗粒的流动状态,设计制作了亚克力材质的透明立筒仓模型,采用不同形状、大小的亚克力颗粒模拟筒仓卸料过程,对比了颗粒形状、粒径及筒仓中心减压管的存在对颗粒流动特性的影响。研究表明,颗粒在不含中心减压管的筒仓卸料时,卸料前期流动状态表现为整体流动,而卸料后期流动状态表现为漏斗流。与球形颗粒相比,正方体颗粒更易在卸料过程中出现管状流,并在仓壁内表面出现明显的颗粒滞留现象。同时,颗粒粒径越大,其对周围颗粒的影响范围越大,从而引发更大范围的颗粒流动。此外,在筒仓内装配中心减压管可以减缓卸料进程和改变出料顺序,从而使仓内颗粒流出状态更均匀,进而保证筒仓结构的安全性和完整性。
In the silo,the flow state of the particles is influenced by the silo structure.And the flow characteristics of the particles in the silo unloading process will also threaten the safety of the silo structure.In order to observe the discharge flow pattern of particles,the transparent vertical silo was designed in this experiment.Acrylic particles of different shapes and sizes were used to simulate the unloading process of silo,and the influence of particle shape,particle size and the central decompression tube on the flow characteristics of particles was compared.The results show that the particles flow pattern was mass flow in the early stage of discharge in the vertical silo without central decompression tube.And in the late stage of discharge of silo,the particles flow pattern was obviously funnel flow.Compared with spherical particles,cuboid particles are more likely to have tubular flow in the unloading process and have obvious particle retention on the inner surface of the bin wall.In addition,the large particles had a larger impact scope,and the flow area diameter is larger.The central decompression tube slowed down the discharge process,and changed the discharge sequence of particles,meanwhile,the discharge of particles was more evenly.
作者
孙慧男
周萌萌
SUN Huinan;ZHOU Mengmeng(COFOCO Engineering&Technology(Zhengzhou)Co.,Ltd.,Zhengzhou 450001,China;COFCO Engineering&Technology Testing and Certification Co.,Ltd.,Zhengzhou Branch,Zhengzhou 450001,China)
出处
《现代食品》
2024年第5期1-8,共8页
Modern Food
基金
“十四五”国家重点研发计划重点专项(2022YFD2100201-01)。
关键词
筒仓
颗粒流动性
颗粒形状
颗粒粒径
中心减压管
silo
particle mobility
particle shape
particle size
central decompression tube
