LIU Long¹, GAO Aimin¹, CHENG Zhixin², LIU Fengjun², WANG Hongsong¹, REN Wei¹, WANG Changde¹

(1. College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, China;2. Jiuquan Zhulong Machinery Manufacturing Co., Ltd., Jiuquan 735000, China)

Abstract: In order to improve granulating efficiency, the intrinsic parameters of straw were measured and the granulating process was simulated by using discrete element software EDEM and finite element software ANSYS. The changes of external force number with time, as well as the changes of particle contact number with time were studied. The influence of die hole aperture, die hole cone angle and powder particle size on the granulating effects were analyzed and the structural parameters of ring die were optimized. The results show that simulated granulation process is basically the same as the actual granulation process. The particle velocity and external force show a periodic fluctuation state. The particle contact number has a periodic and gradually decreasing trend. The straw granulating process is a periodic cyclic extrusion process. When the die hole aperture is 5 mm, the die hole cone angle is 75° and the powder particle size is 0.6 mm, the wear deformation of ring die surface is slight and the granulation quality and efficiency are the best.

Keywords: straw; granulating process; ring die structure; parameter optimization; simulation

Received： 2022-06-21，Revised：2022-11-02，Online：2022-12-01 16:28。

Funding Project： 甘肃省自然科学基金项目，编号：21JR7RA817；甘肃省教育厅产业支撑计划项目，编号：2021CYZC-39。

First Author： 刘龙(1998—)，男，硕士研究生，研究方向为农业工程技术与装备。E-mail： 872529933@qq.com。

Corresponding Author： 高爱民(1981—)，男，副教授，博士，硕士生导师，研究方向为农业工程技术与装备。E-mail： gaoaimin@gsau.edu.cn。