基于Fluent下超细制浆粉碎刀头的流场分析

Flow field analysis on ultra-fine pulping and pulverizing cutter head by Fluent

结合超细粉碎技术原理,设计出了2种齿型式粉碎刀头,并使用Fluent仿真软件分析了在转速分别为6 000,9 000,12 000r/min时2种粉碎刀头内部压力、速度的变化规律,然后通过物料粉碎试验验证了2种刀头的粉碎效果,同时对2种刀头的能耗进行了对比分析。结果表明:中心结构为四叶刀片的齿型粉碎刀头,粉碎50g大豆所花的时间大约为2min,粉碎后大豆的平均粒径值大约为4μm,并且能耗比中心结构为三叶轮的刀头消耗更少,在6 000,9 000,12 000r/min转速下粉碎5min能耗分别为0.007 25,0.022 49,0.059 43kW·h。

Two kinds of tooth type pulverizing cutter heads are designed based on the principle of superfine pulverization technology,and two kinds of pulverizing knives are analyzed using Fluent simulation software at the speeds of 6 000 r/min,9 000 r/min and 12 000 r/min.The variation of pressure and speed inside the head was studied.Then the pulverization effect of the two cutter heads was verified by the material pulverization experiment.At the same time,the energy consumption of the two cutter heads was compared and analyzed.Results:The central structure was a four-blade blade tooth-crushing cutter head.The time spent smashing 50 g of soybean was about 2 min.The average particle size of soybean after pulverization is about 4 μm,and the energy consumption ratio was consumed.The center structure had less tip consumption for the three impellers.The energy consumption for crushing for 5 min at 6 000 r/min,9 000 r/min,12 000 r/min were approximately 0.007 25 kW·h,0.022 49 kW·h,0.059 43.kW·h,respectively,which had good practical application significance.