Abstract:In this paper, the movement behavior of titanomagnetite ore material particles in rotary kiln was simulated. The results showed that the probability accumulation would occur in the process of particles falling down before rising, and the accumulated particles would form discrete piles along the axis direction of the rotary kiln. The reaction area could be divided into nine fluctuation periods to describe the discrete piles, with an average period length of 0.666 m. According to the calculation of enthalpy of endothermic reduction reaction, the fluctuation range of energy in a single cycle accounts for 29.79% of the average value of enthalpy of reaction, and the average fluctuation energy in a single cycle of reaction time (500 s) was deduced as 25.58 MJ, which was easy to cause energy instability. The direct reduction iron production could be carried out by attaching fine pulverized coal (20 g/kg) on the ore material particles, and using external coal pellets to reduce energy fluctuation by buffering local overheating.