摘要
为解决烧结烟气循环系统中烟气分配器存在的烟气分配不均匀问题,以某196 m^(2)烧结机所配套的烟气内循环系统为研究对象,采用Fluent软件构建了烟气分配器的三维几何模型并进行数值模拟分析。模型中充分考虑了烟气在主管与各支管内的流动特性,设置了典型工业工况参数,通过多组仿真计算对比,分析了不同主管圆台角度对烟气分配器内部流动状态的影响,包括速度场、温度场以及压力场的分布特性。结果表明,主管圆台角度对流体分布均匀性具有显著调节作用,其中在圆台角度为88.5°时,各物理场参数分布最为合理,既保证了整体流量通畅性,又有效改善了气流偏斜现象,具备最佳的综合运行性能。在此基础上,对烟气分配器的主管结构进行了重构设计,提出了多阶结构布局的优化方案。仿真结果显示,所设计的四阶阶梯式主管结构相较于传统单阶结构,在保持系统压损合理的前提下,不仅显著提高了烟气总流量,还有效增强了各支管的流速均衡性。具体表现为:各支管的出口平均速度由优化前的8.825 m/s提升至23.325 m/s,提升幅度达164%;同时,出口流场的均匀性指数由0.64上升至0.85,表明优化后的结构在实现等比例烟气分配方面表现更为优异,可显著改善循环系统的运行稳定性和烧结反应的均一性。
In order to solve the problem of uneven distribution of flue gas in the flue gas distributor of the sintering flue gas circulation system,the flue gas internal circulation system of a 196 m^(2) sintering machine was taken as the research object.Fluent software was used to construct a three-dimensional geometric model of the flue gas distributor and numerical simulation analysis was carried out.The model fully considers the flow characteristics of flue gas in the main pipe and each branch pipe,sets typical industrial operating parameters,and compares and analyzes the influence of different main pipe cone angles on the internal flow state of the flue gas distributor through multiple simulation calculations,including the distribution characteristics of velocity field,temperature field,and pressure field.The results indicate that the cone angle of the main pipe has a significant regulatory effect on the uniformity of fluid distribution.Among them,when the cone angle is 88.5°,the distribution of various physical field parameters is the most reasonable,which not only ensures the overall flow smoothness but also effectively improves the phenomenon of airflow deviation,and has the best comprehensive operating performance.On this basis,the main pipe structure of the flue gas distributor was reconstructed and designed,and an optimization scheme for multi-level structural layout was proposed.The simulation results show that compared with the traditional single-stage structure,the designed fourth-order stepped main pipe structure not only significantly improves the total flue gas flow rate while maintaining reasonable system pressure loss,but also effectively enhances the flow velocity balance of each branch pipe.Specifically,the average outlet velocity of each branch pipe has increased from 8.825 m/s before optimization to 23.325 m/s,with an increase of 164%.At the same time,the uniformity index of the outlet flow field increased from 0.64 to 0.85,indicating that the optimized structure performs better in achieving proportional flue gas distribution,significantly improving the operational stability of the circulation system and the uniformity of the sintering reaction.
作者
杨亚朋
李杰
杨爱民
张遵乾
Yang Yapeng;Li Jie;Yang Aimin;Zhang Zunqian(School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei;School of Science,North China University of Science and Technology,Tangshan 063210,Hebei)
出处
《河北冶金》
2025年第7期93-101,共9页
Hebei Metallurgy
基金
国家自然科学基金面上项目(51974131)。
关键词
烧结
烟气循环
烟气分配器
结构优化
数值模拟
sintering
smoke circulation
smoke distributor
structural optimization
numerical simulation
