硫铁矿沸腾焙烧炉多相流动反应特性的数值模拟  

Numerical investigation on multi-phase flow reaction characteristics in pyrite fluidized roasters

作　　者：穆玺文 缪海山 薛绍秀 韩志明 曾伟 焦璐璐 张浩[1,2] 余艾冰 Mu Xiwen;Miao Haishan;Xue Shaoxiu;Han Zhiming;Zeng Wei;Jiao Lulu;Zhang Hao;Yu Aibing(Key Laboratory of Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Wengfu(Group)Co.,Ltd.Wengfu Chemical Company,Fuquan 550500,China;School of Energy and Environment,Southeast University,Nanjing 210096,China;Jiangsu Jicui Industrial Process Simulation and Optimization Research Institute,Suzhou 215000,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,沈阳110819 [2]东北大学冶金学院,沈阳110819 [3]瓮福(集团)有限责任公司瓮福化工公司,贵州福泉550500 [4]东南大学能源与环境学院,南京210096 [5]江苏集萃工业过程模拟与优化研究所有限公司,江苏苏州215000

出　　处：《材料与冶金学报》2024年第3期218-225,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(12072071);江苏省自然科学基金项目(BK20210007).

摘　　要：采用双流体方法对硫铁矿在沸腾焙烧炉内的多相流动反应特性进行数值模拟研究,得到了不同工况下炉内温度分布、各组分分布及反应速率等关键数据,重点分析了进气速度和预热风温对反应速率的影响规律.结果表明:当进气速度由2 m/s增至2.5 m/s时,沸腾焙烧炉内焙烧硫铁矿的反应速率由8.01 mmol/(m^(3)·s)增至13 mmol/(m^(3)·s),同时流化床层厚度会随着进气速度的增加而增大,但过高的气速有可能致使固相扰动SO2的收集工序,因此建议将进气速度调整至2.5 m/s;预热风温对提高沸腾焙烧炉内硫铁矿的反应速率起促进作用,当预热风温由25℃升至600℃时,炉内平均温度升高,反应速率由4.1 mmol/(m^(3)·s)增至6.3 mmol/(m^(3)·s),反应进行得更完全,残硫率也更低;当预热风温到达600℃时,炉内局部区域超过1000℃,极易造成安全隐患,因此建议将预热风温设置在200~300℃.A numerical simulation study was conducted on the multiphase flow reaction characteristics of pyrite in a fluidized bed roaster using a dual fluid method.Key data such as temperature distribution,component distribution,and reaction rate in the furnace under different operating conditions were obtained,with a focus on analyzing and discussing the influence of gas velocity and wind temperature on reaction rate.The results show that when the inlet velocity increases from 2 m/s to 2.5 m/s,the reaction rate of roasting pyrite in the fluidized bed roaster increases from 8.01 mmol/(m^(3)·s)to 13 mmol/(m^(3)·s).At the same time,the thickness of the fluidized bed layer increase with the increase of inlet velocity.However,excessive gas velocity may cause solid phase disturbance to the SO2 collection process.Therefore,it is recommended to adjust the inlet velocity to 2.5 m/s;In addition,preheating air temperature plays a promoting role in improving the reaction rate of pyrite in the boiling roasting furnace.When the air temperature increases from 25℃to 600℃,the average temperature in the furnace increases,and the reaction rate increases from 4.1 mmol/(m^(3)·s)to 6.3 mmol/(m^(3)·s).This indicates that the more complete the reaction,the lower the residual sulfur rate;When the wind temperature is preheated to 600℃,the local area inside the furnace exceeds 1000℃,causing safety hazards.Therefore,it is recommended to set the preheating temperature between 200~300℃.

关 键 词：硫铁矿 多相流动反应 沸腾焙烧炉 残硫率 

分 类 号：TF806.11[冶金工程—有色金属冶金]