单台一次风机运行管道结构优化数值分析

Numerical Simulation and Structure Optimization of The Primary Air Pipe Under Unilateral Operation

对单侧一次风机运行时管道内的气体流动进行研究。对现场数据进行分析,得出单台风机运行燃烧不稳定原因。采用Fluent软件,选用k-εrealizable型湍流模型,对各工况下的原有设计和使用弯管结构的一次风母管进行研究。综合现场数据和数值结果得出结论:使用弯管段后,气流流动更加舒畅,减少了两侧动压差,同时处于对冲组的一次风出口速度差下层Vx降低60%左右,中层Vx降低30%左右,提高了出口速度均匀程度。

The gas flow in the pipe was studied while one side primary fan running. Based on the analysis of the spot data,the reason of combustion instability of single fan was obtained.By using Fluent software and turbulence model of k-εrealizable, the study of primary air main with original design and the elbow structure under different working conditions.Based on the spot data and numerical results, it was concluded that the air flow was more fluency and the dynamic pressure difference on both sides were reduced. Besides, the velocity difference of primary air outlet sections in the opposed group were reduced by 60% in the lower layer and 30% in the middle layer, which improved the uniformity of outlet velocity.