Modelling the Solids Throughput of Single Screw Smooth Barrel Extruders as a Function of the Feed Section Parameters
Modelling the Solids Throughput of Single Screw Smooth Barrel Extruders as a Function of the Feed Section Parameters
复制标题
DOI：
10.3139/217.2588
复制
发表时间：
2012-08-01
影响因子：
1.3
通讯作者：
Porsch, A.
中科院分区：
文献类型：
--
作者：
Lessmann, J. -S.;Weddige, R.;Porsch, A.
在光滑机筒挤出机中，生产量通常由计量部分的泵送能力决定。在进料区内，输送的颗粒总是比在压缩区熔化的颗粒多，并在计量区排出。在高螺杆速度下，只有当颗粒足够快地从料斗流入螺杆通道并且完全填充时，才会发生这种效果。在这种情况下，固体吞吐量直到最大螺杆速度显示出与速度的近似线性关系。这些线性固体输送特性使得料斗开口的结构改变成为必要。在这篇文章中，模拟了具有近似线性输送特性的固体输送过程，其速度高达2，000 min（-1）（圆周速度高达3 m/s），具有不同的进料斗几何形状。采用离散元法（DEM）对颗粒进行了模拟，其中颗粒被近似为单个球形颗粒。从模拟结果中，通过量纲分析，推导出用于描述作为固体进料区的几何形状和工艺参数的函数的吞吐量的模型。
In a smooth barrel extruder, the throughput is generally dominated by the metering sections pumping ability. Within the feed zone, more granules can always be conveyed than can melt in the compression zone and be discharged in the metering zone. At high screw speeds, this effect will only occur if the granules flow quickly enough out of the hopper into the screw channel and this is filly filled. In this case, the solids throughput up to maximum screw speed shows an approximately linear relationship to the speed. These linear solids conveying characteristics necessitate constructional changes to the hopper opening. In this article, solids conveying processes with approximately linear conveying characteristics up to speeds of 2,000 min(-1) (peripheral velocities up to 3 m/s) are simulated with various feed hopper geometries. The simulations are carried out by means of DEM (Discrete Element Method) in which the granules are approximated by single spherical particles. From the simulation results, via dimensional analysis a model is derived for describing the throughput as a function of the geometry and process parameters of the solids feed zone.