本文采用颗粒相连续介质－轨道模型对同轴射流渐扩式高炉氧煤燃烧器内煤粉燃烧过程进行了数值模拟。数值模拟结果表明，同轴射流渐扩式氧煤燃烧器在适当的射流速度比条件下，可在氧煤枪出口后方诱导出回流区及低速区，有利于延长煤粉在直吹管内的停留时间，改善煤粉在热风管中加热、挥发和挥发份的着火条件，改善氧气和煤粉的混合，提高煤粉燃烧区的氧气浓度。 In this paper, the granular continuous medium-orbit model is used to simulate the pulverized coal combustion process in the coaxial jet flow expanding BF. The numerical simulation results show that the coaxial jet-expanding oxygen coal burner can induce a recirculation zone and a low velocity zone behind the outlet of the oxygen coal gun at the proper jet velocity ratio, which is beneficial to prolong the stay of pulverized coal in the straight blow pipe Time, to improve the pulverized coal heating in the hot air duct, volatile and volatile ignition conditions, improve the oxygen and pulverized coal mixture, improve the oxygen concentration of pulverized coal combustion zone.