某600 MW机组引风机出口烟道流场优化  

Flow Field Optimization for a Flue Gas Duct at Induced Fan Outlet of a 600 MW Unit

作　　者：胡善苗 韦红旗[1] 沙远超 汪超 Hu Shanmiao;Wei Hongqi;Sha Yuanchao;Wang Chao(School of Energy and Environment, Southeast University, Nanjing 210096, China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《发电设备》2021年第5期329-333,共5页Power Equipment

摘　　要：对某600 MW机组引风机出口烟道流场进行数值模拟,通过增设导流板、设置倒角进行优化改造,利用速度、湍动能与速度偏差系数对烟道流场进行分析与评价,并通过测试验证了模拟结果的可靠性。结果表明:优化后烟道流场中局部高速区、低速涡流区显著减少,湍动能大幅度减小,流场均匀性得到有效改善;汇流后截面速度偏差系数由49.8%降至14.9%,烟道整体阻力降低255 Pa,优化效果显著。Numerical simulations were conducted on the flow field of a flue gas duct at the induced fan outlet in a 600 MW unit,and optimization retrofits were carried out by adding guide plates and setting up chamfers.Following parameters were used to analyze and evaluate the the flow field of the duct,such as the velocity,the turbulent kinetic energy and the coefficient of velocity deviation,after which,the reliability of simulation results were validated through experiments.Results show that after the optimization,the local high speed region and the low speed vortex region are significantly reduced,the turbulence kinetic energy is greatly reduced,and the flow uniformity is effectively improved.The coefficient of velocity deviation of the cross section is decreased from 49.8%to 14.9%,while the overall flue resistance of the duct is decreased by 255 Pa.This presents a good effect of the optimization.

关 键 词：锅炉 烟道 引风机 湍动能 速度偏差系数 

分 类 号：TM621.7[电气工程—电力系统及自动化]