辽西钒钛磁铁矿焙烧回转窑内气固传热数值模拟  

Numerical Simulation of Gas-Solid Heat Transfer in West Liaoning Vanadium-Titano Magnetite Rotary Kiln

作　　者：张义奇[1] 董辉[1] ZHANG Yiqi, DONG Hui(SEP Key Laboratory on Eco-Industry, Northeastern University, Shenyang 110819, Chin)

机构地区：[1]东北大学国家环境保护生态工业重点实验室,辽宁沈阳110819

出　　处：《工业炉》2018年第2期11-14,共4页Industrial Furnace

基　　金：国家科技支撑计划项目(2015BAB18B02)

摘　　要：在对钒钛磁铁矿焙烧回转窑的传热过程及物料运动行为进行研究的基础上,建立了钒钛磁铁矿焙烧回转窑温度分布数学模型。并应用数值计算方法对该模型进行求解,得到了中试回转窑内物料和烟气沿轴向的温度分布。结果表明:物料在刚进入回转窑时被迅速加热,随后升温速率减慢;当烟气温度较低时,对流换热系数为20 W/(m·K)左右,为辐射换热2倍;随着烟气温度升高,辐射换热成为主要机制,在窑尾处可达对流换热10倍左右;对于中试回转窑,数值计算模型与实验结果误差最高为50 K,具有较高的准确性,可指导生产中回转窑设备的优化。Based on the analysis of heat transfer process and materials motion in vanadium-titano magnetite rotary kiln, the temperature distribution mathematical model of vanadium-titano magnetite rotary kiln is built. Using simulation method, the axial temperature distribution of experimental rotary kiln is obtained. The results show that, the materials are sharply heated when initially enter kiln, and then the heating rate slows down. When the flue gas temperature is low, the convective heat transfer coefficient is about 20 W/（m.K）, which is twice the heat transfer. As the temperature of flue gas increases, the radiation heat transfer becomes the main mechanism, which is about 10 times the convective heat transfer of the kiln tail at the end. For pilot rotary kiln, the maximum error of the numerical calculation model and the experimental result is 50 K, the numerical calculation model has high accuracy, is able to guide rotary kiln equipment optimization in the production.

关 键 词：回转窑 钒钛磁铁矿 传热 数值模拟 

分 类 号：TK175[动力工程及工程热物理—热能工程] TK124