污水管道强化通风技术的CFD模拟及现场验证

Simulation and experimental study on reinforced ventilation of sewage pipelines

污水管道通风不畅是管道厌氧产生有害气体并不断富集的主要原因。为此,提出了在上下游建筑立管并设置风机以增强污水管道通风的应对方法,且以西安市某建筑的部分污水管道为例,建立了通风效能的计算流体力学(CFD)模型,并进行了现场实验验证。现场实验结果证明了通风效能和CFD模拟方法的可靠性。模拟结果表明:CFD模拟与实测结果偏差小于7.0%;增强通风量的2.3%通过立管近处检查井孔溢出;所选风机对污水管道的影响区域为510~750 m;风机运行对建筑横支管水封损耗小于国内规定的水封破坏值;风机运行安全可行。以上研究结果可为疏导城市建筑污水管道中的有害气体,控制污水管道安全风险提供参考。

Poor ventilation of sewage pipes is the primary cause of anaerobic generation and continuous accumulation of hazardous gases.Therefore,this paper proposed a method to enhance the ventilation of sewage pipes by installing a blower in the upstream and downstream building standpipes.Taking part of sewage pipes in a building in Xi′an as an example,a computational fluid dynamics(CFD)model of ventilation efficiency was established and verified by field experiments,the results of which demonstrated the reliability of the ventilation efficiency and the CFD simulation method.The simulation results revealed that the deviation between CFD simulation and measured results was less than 7.0%,and 2.3%of the enhanced ventilation overflowed through the inspection shaft hole near the standpipe.The influence area of the selected blower on the sewage pipeline was 510-750 m.The water seal loss of the horizontal branch pipe in the building caused by the operation of the blower was less than the water seal damage value stipulated in China,and the operation of the blower was safe and feasible.The results of this study can provide reference for dredging harmful gases in urban construction sewage pipes and controlling the safety risks of sewage pipes.