操作参数对烧结镁砂煅烧竖炉传热过程的影响  

Effect of operation parameters on heat transfer process in sintered magnesia shaft furnace

作　　者：刘佳伟 张晓虎 赵亮[1] 徐天骄[1] 董辉[1] LIU Jiawei;ZHANG Xiaohu;ZHAO Liang;XU Tianjiao;DONG Hui(State Environmental Protection Key Laboratory of Eco-Industry,Northeastern University,Shenyang 110819,Liaoning,China)

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：《烧结球团》2021年第2期44-49,共6页Sintering and Pelletizing

基　　金：辽宁省重点研发计划资助项目(2019JH2/10100007);辽宁省“兴辽英才计划”资助项目(XLYC1802122)。

摘　　要：本文以年产量为5万t的烧结镁砂煅烧竖炉为研究对象,基于局部非热力学平衡理论,运用多孔介质模型,构建烧结竖炉三维稳态气固传热数值模拟模型,对床层黏性阻力系数和惯性阻力系数进行修正,并将菱镁矿下移速度嵌入到气固传热模型中,以完成烧结竖炉模型的构建;以煅烧时间和煅烧温度作为评判指标,探究竖炉操作参数对气固传热过程的影响。结果表明:随着煅烧风和冷却风流量的增加,煅烧时间和温度会分别随之增加和减小,且与气体流量呈非线性关系,煅烧时间变化率随着气体流量的增加逐渐增大;对于当量直径为26 mm的球团,在煅烧时间为4~5 h,煅烧温度≥1250℃的理想煅烧条件下,煅烧风流量为2069.9~2957.0 m^(3)/h,冷却风流量为2077.2~3000.4 m^(3)/h是竖炉较适宜的操作参数。With a shaft furnace of 5×10^(4)t annual capacity for sintered magnesia as the research object,the numerical simulation model of three-dimensional steady-state gas-solid heat transfer of shaft furnace is established based on the local non-thermodynamic equilibrium theory and the porous media model.The viscosity resistance coefficient and inertia resistance coefficient of the magnesite layer are corrected,and the downward movement velocity of the magnesite is embedded into the numerical model,completing the establishment of the shaft furnace model.The calcination time and temperature are used as the evaluation indexes in order to study the effects of operation parameters on gas-soild heat transfer process.The results show that,with the increase of the calcination air volume and the cooling air volume,the calcination time and temperature will increase and decrease respectively,being nonlinear with theairvolume,and the change rate of calcination time will gradually increase with the increase of air volume.For pellets with equivalent diameter of 26 mm under the condition of calcination time of 4~5 h and calcination temperature above 1250℃,the suitable operating parameters are obtained as:the calcination air volume is 2069.9~2957.0 m^(3)/h;and the cooling air volume is 2077.2~3000.4 m^(3)/h.

关 键 词：烧结镁砂竖炉 操作参数 传热 数值模拟 局部非热力学平衡 

分 类 号：TF806.21[冶金工程—有色金属冶金] O357.53[理学—流体力学]