Abstract：The rotary kiln-pre-reduced oxygen coal combustion fusion iron making process uses the fine ore of wide particle size into furnace directly. After the counter current heat transfer and pre reduction of flue gas in the rotary kiln, the charge particles reach the oxygen coal combustion melting and separating furnace through the settling tube. In order to avoid the phenomena of charge particles scouring the furnace wall, wall accumulation and uneven gas-solid heat transfer in the settlement area, realize the coupling control of particle settlement and heat transfer process, minimize the temperature difference between charge and molten pool, ensure the stability of molten pool smelting and achieve good smelting effect. Computational fluid dynamics discrete element method (CFD-DEM) was used to study the effects of gas velocity and charge size on the settling trajectory and heat transfer behavior of charge particles under the action of counter current gas in the upper zone of oxygen coal combustion melting and separating furnace. The numerical simulation results show that the settling velocity of charge particles decreases with the increase of gas flow rate, and the effect of gas on small particle size is particularly obvious. The sedimentation effects of charge particles for each particle size are good when the gas velocity is 1 m/s; the sedimentation effects of charge particles with sizes of 1.0, 1.5 and 2.0 mm are relatively good when the gas velocity is 2 m/s; the charge particles with sizes of 1.5 and 2.0 mm can settle smoothly when the gas velocity is 3 m/s. For the heat transfer behavior of charge particles, the larger the gas velocity is, the smaller size of charge particles is, and the better heat transfer effect of the charge particles is. Considering the heat transfer and settlement behavior of charge, the settlement velocity and heat transfer of charge particles with particle size of about 1.0 mm are good under the action of gas velocity of 1 and 2 m/s.
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