基于EDEM的烘干滚筒砂石颗粒抛洒特性仿真分析

Simulation Analysis of Scattering Characteristics of Sand and Gravel in Drying Roller Based on EDEM

摘要: 为了掌握烘干滚筒内砂石颗粒的抛洒特性，提高烘干滚筒中砂石颗粒的烘干效果，本文基于工程实际，设计了一种一段式折弯烘干滚筒扬料叶片，建立了砂石颗粒的运动学模型，并利用离散元软件EDEM，以料帘均匀性与料帘密度为试验目的进行正交仿真试验。仿真结果表明，扬料叶片的结构尺寸参数对料帘均匀性与料帘密度的影响从高到低分别为：翼板高度与腹板高度的比值、折弯角度、腹板高度、扬料叶片圆周数目。对于直径3000 mm、转速为8.3 r∙min−1的烘干滚筒，当一段式折弯扬料叶片的腹板高度为170 mm、翼板高度与腹板高度的比值为0.5、折弯角度为120˚、扬料叶片圆周数目为21片时，综合料帘密度与料帘均匀性要求达到最佳平衡点。此仿真试验可为扬料叶片的设计提供理论依据，为工程实际的应用提供一定的帮助。

Abstract: In order to grasp the drying cylinder scattering characteristics of sand particles, improve the effect of drying in the drying cylinder, this article is based on the engineering practice, which designed a one bending drying drum feed blade, sand particle kinematics model was established, and by using discrete element software EDEM, shade uniformity and the density of the curtain material for test purposes of orthogonal simulation test. The experimental results showed that the influence of the structural dimension parameters of the hoisting blade on the curtain uniformity and the curtain density from high to low are the ratio of the wing height to the web height, bending Angle, the height of the web and the number of the hoisting blade circumference. For the drying cylinder with a diameter of 3000 mm and a rotation speed of 8.3 rpm, bending feed when one leaves the web height is 170 mm, the wing plate height and the ratio between the depth of the web 0.5, bending Angle is 120˚, feed circular blade number is 21, comprehensive shade density and material curtain uniformity requirements to achieve the best balance point. The simulation test can provide a theoretical basis for the design of the material hoisting blade and a certain help for the practical application of engineering.