1025t/h锅炉空预器出口烟道结构优化改造技术研究  

Research on Structural Optimization and Reconstruction Technology of 1025t/h Boiler Air Preheater Outlet Flue

作　　者：田策 TIAN Ce(Datang Qingyuan Thermal Power Co.,Ltd.,Baoding,Hebei 071100,China)

机构地区：[1]大唐清苑热电有限公司,河北保定071100

出　　处：《东北电力技术》2024年第4期43-47,共5页Northeast Electric Power Technology

摘　　要：以1025 t/h锅炉空预器出口烟道为研究对象,采用计算流体力学软件对锅炉原始尾部烟道及8种不同烟道改造方式改造后的烟道流场进行对比,分析烟道内导流板数量、位置,烟道外部转角形状对烟道内流场的影响,寻求流场优化方案。结果表明,内部导流板处弧形导流板对于改善流场均匀性更有效,导流板的均流效果及阻力特性在一定范围内随导流板数量增加而增加;导流板安装位置对改善流场均匀性的效果在一定范围内随低速涡流区距离的减小而增加;外部转角处直板对于改善流场均匀性更有效,且直板能够改善流场均匀性的效果在一定范围内随直板长度增大而增加;导流板数量和位置选取不合理均会使流场均匀性恶化,加重积灰;通过增加导流板及改造外部转角来改善烟气流场均具有可行性,并在改造前对导流板改善效果进行模拟计算。Taking the 1025 t/h boiler air preheater outlet flue as the research object,computational fluid dynamics software is used to compare the flow field between the boiler original tail flue and eight different flue reconstruction methods.It analyzes the influence of the number and position of the baffle in the flue and the shape of the external angle of the flue on the flow field in the flue,and seeks the flow field optimization scheme.The results show that the arc baffle at the inner baffle is more effective in improving the uniformity of flow field.The flow sharing effect and resistance characteristics of the baffle increase with the number of baffle in a certain range.The effect of the installation position of the baffle on improving the uniformity of the flow field increases with the decrease of the distance from the low-speed vortex region within a certain range.The outside corner plate is more effective in improving the uniformity of flow field and the effect of the straight plate on improving the uniformity of flow field increases with the increase of the length of the straight plate in a certain range.The unreasonable selection of the number and location of the baffle will worsen the uniformity of the initial flow field and aggravate the ash accumulation.It is feasible to improve the smoke flow field by increasing the baffle and transforming the external angle,and the improvement effect of the baffle should be simulated before the renovation.

关 键 词：锅炉尾部烟道 数值模拟 流场优化 导流装置 

分 类 号：TM621.2[电气工程—电力系统及自动化]