Abstract: The charging system of COREX melting gasifier involved one coalgimbal chute distributor and eight DRIflap distributors. The effects of the flap angle on the charging law of the DRIflap distributors were analyzed by physical experiments and discrete element method (DEM) mathematical modeling simulation. Physical experiment results showed that when the flap angle was small， the burden flow trajectory was more concentrated; however， when the flap angle was large， the burden flow trajectory scattered. The mathematical modeling simulation results of the burden flow trajectory and pile shape agreed well with the physical experiment results， moreover， the detail information of the pile structure and the radial porosity profile can be further obtained by the mathematical modeling simulation， which provided some references to adjust reasonably gas flow distribution in COREX production field.

Key words: COREX melting gasifier, flap distributor, flap angle, discrete element method, numerical simulation