PARAMETER CALIBRATION OF RICE STRAW PARTICLE–CRUSHING MODEL

ABSTRACT Discrete element method is widely used to study grain particles; however, there is a lack of research on the mathematical model parameters of rice straw particles in the crushing simulation process. To determine suitable parameter settings for crushing of rice straw particles in the simulation process, a twin-screw rice straw crushing test device was built using rice straw particles as the research object. Through actual tests, the parameters of the Ab-T10 crushing models of rice straw particles with five different moisture contents were calibrated, and the crushing characteristics of the rice straw particles were analyzed. The Ab-T10 crushing models with calibrated parameters were verified by comparing the probability of the particle-size distribution (t10) between the simulation and actual tests. The results show that the crushing probability and t10 of rice straw increase with the increase in accumulated contact specific energy and decrease with the increase in rice straw moisture content. The minimum value of the fitting parameter between the simulated and measured values is 0.9654, which indicates that the calibrated Ab-T10 crushing model can accurately simulate the rice straw particle-crushing process. This study provides a reference for the analysis of crushing in subsequent rice straw pulping.