Abstract: 3D unsteady simulation was conducted to investigate the temperature profile and slag particle behaviors in the slag-collection process in a batch slag-discharge system.The dynamic simulation studied the effects of cooling water flux and position on the heat transfer and flow.The Mixture model was applied to study the two-phase flow.The Realizable κ-ε turbulence model was used to calculate the continuous phase flow,and the kinetic theory granular flow was used to model the solid phase,while discrete random walk model was adopted to track the particles’ trajectories to research the characteristics of particle motion.The results indicate that a part of the black water in the bottom of the quench chamber leaves at high temperature without heat transfer completely.And the temperature decreases 5-6 ℃ with increasing the cooling water flux with 15 t/h.About 31.8% mass fraction slag flow out of the black water outlet,and the percentage increases 2.6%-6.9% as increasing the cooling water flux with 15 t/h.In addition,with the cooling water flux increasing,the impact on the particles increases.