竖式炉窑气固换热与反应的协同强化  

Synergy enhancement of gas-solid heat transfer and chemical reaction in a shaft furnace

作　　者：陆元翔 李飘 刘恋至 姜泽毅 张欣茹[1,3] 鄂殿玉 LU YuanXiang;LI Piao;LIU LianZhi;JIANG ZeYi;ZHANG XinRu;E DianYu(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry,University of Science and Technology Beijing,Beijing 100083,China;Beijing Engineering Research Center of Energy Saving and Environmental Protection,University of Science and Technology Beijing,Beijing 100083,China;International Institute for Innovation,Jiangxi University of Science and Technology,Nanchang 330013,China;Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems,Jiangxi University of Science and Technology,Nanchang 330013,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京科技大学冶金工业节能减排北京市重点实验室,北京100083 [3]北京科技大学北京市节能环保工程技术研究中心,北京100083 [4]江西理工大学国际创新研究院,南昌330013 [5]江西理工大学江西省颗粒系统仿真与模拟重点试验室,南昌330013

出　　处：《中国科学：技术科学》2024年第8期1563-1576,共14页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2018YFB0605903);中央高校基本科研业务费专项基金(编号:FRF-TP-22-081A1);国家自然科学基金(批准号:52264042);中国博士后科学基金(编号:2021M690975);江西省自然科学基金(编号:20212BAB214023)资助项目。

摘　　要：竖式炉窑内动量、能量、质量传递和化学反应之间是相互影响的,建立炉内能质传递和化学反应间的协同耦合关系对竖炉节能降耗增产有重要意义.本文探讨了颗粒有序堆积单元结构通道内流动换热反应的场协同原理.为深入研究竖炉内炉料堆积下的多物理场间协同强化关系,针对简单立方(SCC)、体心立方(BCC)和面心立方(FCC)有序堆积方式下的颗粒堆积单元结构通道,本文采用CFD软件对其流动换热反应过程进行数值模拟,对比了其中两种颗粒雷诺数条件(Re_(p)=200和Re_(p)=2000),并探讨其传热传质场协同原理.模拟结果表明:在整体上看,FCC堆积方式的整体换热和反应速率最大,在流动方向上对温度降低的影响最为显著,且流动速度对温度分布的影响相对较小,SCC结构则刚好相反.针对气固反应,BCC堆积方式的整体传热、传质场协同数最大,当Re_(p)=2000时,平均值分别在130和260.在空气流动方向上,场协同数(传热/传质)、颗粒表面对流换热系数和反应速率呈周期性振荡,且在传热和传质场协同数较大的区域,其颗粒表面对流换热系数和反应速率也较大.Momentum,energy,mass transfer,and chemical reactions in shaft furnaces are complex and mutually influence each other.Therefore,to achieve low energy consumption and high productivity in shaft furnaces,understanding the coupling relationships between energy-mass transfer and chemical reactions is of great significance.Herein,the synergy enhancement mechanism in a shaft furnace and the field synergy principle of flow,heat transfer,and chemical reactions in structured packed beds with spherical particles were investigated.To investigate the multiphysical field synergy enhancement relationships in the burden accumulation of shaft furnaces,the numerical simulations of flow,heat transfer,and chemical reactions in structured packed beds with spherical particles were conducted,where the spherical particle packings were simple cubic crystal(SCC),body-centered cubic(BCC),and face-centered cubic(FCC).Two particle Reynolds number conditions(Re_(p)=200 and Re_(p)=2000)were compared,and the heat and mass transfer field synergy principles were discussed.Results showed that the overall heat transfer and reaction rate in the FCC packing were the largest.The FCC packing results in a more pronounced temperature decrease trend along the flow direction,with the flow velocity having minimal impact on the temperature distribution.Conversely,the SCC packing exhibits opposite characteristics.In terms of gas-solid reactions,the BCC packing has the largest synergistic number for the overall heat and mass transfer fields,averaging approximately 130 and 260 at Re_(p)=2000,respectively.The heat and mass transfer field synergy numbers in the airflow direction were periodic oscillations,which corresponded to the particle surface convective heat transfer coefficient and reaction rate.When the field synergy numbers were large,the particle surface convective heat transfer coefficient and reaction rate were also large.The particle surface convective heat transfer coefficient,heat transfer field synergy number,reaction rate,and mass transfer field s

关 键 词：竖炉 颗粒堆积 协同强化 气固换热 数值模拟 

分 类 号：TQ054[化学工程]