Abstract: In order to ascertain the distribution of gas phase temperature field,particle flow characteristics,particle residence time,particle heating rate in the main furnace of suspension magnetization roasting,three-dimensional numerical simulation of gas-solid flow and heat transfer in the main furnace of suspension magnetization roasting was carried out by utilizing Euler method for gas phase calculation and Discrete Phase Model for particle calculation.The gas-solid interaction is also considered in the calculation.The result showed that the temperature in the center of the furnace is high,and low temperature is distributed near the furnace wall.Additionally,the temperature distribution in the furnace gradually tends to be uniform along the height direction of the main furnace.After the particles enter the main furnace,the particles rise rapidly under the drag of the air flow.The particles reach the top of the main furnace in 1.0 s,and the particles begin to escape at the outlet of the top elbow at 1.2 s.After the particles enter the main furnace,the temperature rises to peak rapidly.Due to the continuous energy exchange between the particle phase and the gas phase,the particle temperature decreases when the particles reach the upper low temperature zone of the main furnace.The particle residence time present “early peak,long tail”,more than 95% of the particles escape within 1.2~3.6 s.

Key words: gas solid two phase flow, temperature field, residence time, particle temperature