中文摘要：

应用数学方法研究了回转窑内冷态射流、气固两相流湍流场的流动特性及颗粒运动轨迹。应用文献中单相冷模实验对数学方法进行了有效验证,并分析四通道燃烧器各风道送风参数对窑内气流混合、回流大小及旋流强度的影响。在单相模型基础上,加入离散相颗粒轨道模型,考察在气相湍流场中喷入煤粉时气体运动及颗粒分布特性。结果表明：中心风对中心回流区的形成有重要影响;若使内旋流风与外直流风形成更强的速差射流,促进一次风对高温二次风的卷吸回流,将有利于煤粉燃烧;在重力作用下,随着煤粉粒径的增大,沉积在窑底部的煤粉越多;粒径为30μm的煤粉颗粒在窑内分布比较均匀。

英文摘要：

The flow rule and coal particles movement characteristics of cold jet and gas-solid two phase flow in rotary kiln were analyzed by using a numerical method. The effect of each duct air supply parameter of four--channel burner on the strength of mixed size, backflow and whirl was investigated, and the numerical method was verified via a single-phase cold model. The discrete phase particle track model was added to the single-phase cold model to analyze the gas movement characteristics and particle distributions when a pulverized coal was injected into the gas phase turbulent flow field. The results show that the center air duct has an effect on the formation of central backflow. It was indicated that a jet with speed difference produced from both the internal rotational wind and direct wind could promote the entrainment and backflow of the high temperature secondary air and profited pulverized coal combustion under gravity. The coarser the coal particle size, the greater the pulverized coal deposited at the bottom of the kiln could be. The distribution was more uniform at the particle size of 30 μm.