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The interior of the molten pool is a complex high temperature environment, and the internal high temperature flue gas flow process has an important impact on the smelting effect Aiming at the flow process of high temperature flue gas in the molten pool, the growth of bubbles generated by high temperature flue gas injection, the change of velocity in the rising process and the change of temperature in the molten pool, as well as the gas liquid two phase mixing state in the molten pool during continuous injection at different speeds were analyzed by numerical simulation. The results show that the bubbles generated by high temperature flue gas injection grow larger at the nozzle of the spray gun, the initial shape is semi circular and gradually becomes elliptical. It rises close to both sides of the spray gun pipe wall. During the rising process, the lower boundary is concave inward and rises in an 11 umbrella cap shape11. The higher the rising height is, the deeper the inward depression is, and it breaks into multiple small bubbles when it rushes out of the liquid level. The velocity of high temperature flue gas with different injection speeds decreases rapidly in the process of generating bubbles at the nozzle of the spray gun. The velocity of the generated bubbles is basically stable at 0.25 m/s. When the bubbles move in the molten pool, their internal temperature drops rapidly to 300 K in a short time, and there is an obvious gradient change in the internal temperature field. Within 1 s, the higher the injection speed of high temperature flue gas, the better the gas liquid two phase mixing state in the molten pool. [ABSTRACT FROM AUTHOR]