Optimization and study of roll stud parameters of high-pressure grinding rolls based on DEM-PRM

Abstract

This paper mainly investigates the influence of the size and arrangement of studs on the surface of high-pressure grinding rolls (HPGR) on performance. Firstly, the structural principles of HPGR are introduced, and the discrete element method (DEM) simulation model simulating the operation of HPGR is established based on the contact model and particle replacement model (PRM). Then, calibration and verification of contact parameters and breakage parameters in the DEM simulation are conducted through the tumbling test and piston-and-die test. The DEM model of HPGR is validated in combination with experiments. A simulation scheme for optimizing stud parameters is established based on the Box-Behnken design (BBD). The effects of stud diameter, surface spacing, and angular interval on HPGR performance are analyzed through analysis of variance (ANOVA) and response surface methodology (RSM). Based on this, a performance prediction model based on multivariate nonlinear regression is established. Additionally, throughput, specific energy consumption and discharge fineness are taken as the optimization objectives. The results after optimization show that the specific energy consumption is reduced while throughput and discharge fineness are improved to varying degrees.