Abstract: The charging system of COREX melter gasifier consists of one coal-gimbal distributor and eight DRI-flap distributors. As the DRI-flag distributor is a new type of distributor， few research is found to help to understand the charging process of DRI-flap distributor in depth. In this study， a mathematical model of charging process of the DRI-flag distributor was developed based on discrete element method and was used to investigate the effect of operating parameters during charging process. The relationship between the flap angle and radial position was obtained when studying the effect of flap angle on the landing position. After examing the formation process and internal segregation of the stock pile， the size segregation in the radial direction was revealed. Meanwhile， the distribution of ore and coke in the radial direction was given during their mixture charging process. These modeling results can guide us to adjust charging mode in COREX production field.

Key words: DRI-flap distributor, discrete element method, charging law, mixture charging, numerical simulation