深埋输水管道检修期污染物浓度分布特性研究  

Study on the Distribution Characteristics of Pollutants Concentrations during Maintenance Period of Underground Water Conveyance Tunnel

作　　者：欧盛贤 毕海权[1] 冯凌巍 周远龙 陈钿湖 何常新 Ou Shengxian;Bi Haiquan;Feng Lingwei;Zhou Yuanlong;Chen Dianhu;He Changxin(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,630031;Guangdong GDH Pearl River Delta Water Supply Co.,Ltd,Guangzhou,511466)

机构地区：[1]西南交通大学机械工程学院,成都630031 [2]广东粤海珠三角供水有限公司,广州511466

出　　处：《制冷与空调（四川）》2024年第4期498-504,共7页Refrigeration and Air Conditioning

基　　金：珠江三角洲水资源配置工程地下深埋长距离输水管道检修期通风系统性能研究项目(CD88-JS04-2023-0060)。

摘　　要：地下深埋长距离输水管道内壁存在大量的藻类、壳菜类附着型水生生物,当停水检修时,这些藻类、壳菜会脱水死亡从而产生大量有害气体,给管道检修人员安全带来危害。研究输水管道内污染物浓度分布特性对于优化施工期通风设计、提高检修作业人员的安全性具有重要意义。基于实际输水管道结构及通风系统设计参数,建立了工作井机械送风工况下输水管道通风计算模型,基于流体圆管内紊流流动时速度分布规律和边界层理论并结合数值计算方法,研究了污染物浓度与风速、送风距离之间的关系。研究结果表明:污染物浓度与送风速度间存在较强的关联性,污染物浓度c与断面风速v的关系为:c∝v-1、与送风距离x的关系为:c∝x,当断面风速由0.15m/s增加到0.30m/s时,同一段面污染物浓度可减少50%。通过增加断面风速或减小送风距离,可有效降低管道内污染物浓度,从而避免污染物在输水管道内堆积。In underground long-distance water conveyance tunnels,there is a significant accumulation of algae and Limnoperna fortunei,which are sessile aquatic organisms,on the inner walls.When water flow is halted for maintenance,these organisms dehydrate and die,releasing large quantities of harmful gases and posing a risk to the safety of maintenance workers.Investigating the distribution characteristics of pollutants within these tunnels is crucial for optimizing ventilation design during construction and enhancing the safety of maintenance workers.This paper establishes a ventilation calculation model for water conveyance tunnels under the condition of mechanical ventilation in working wells.The model is based on the actual tunnel structure and the design parameters of the ventilation system.The relationship between pollutant concentration,wind speed,and ventilation distance was investigated using the theory of turbulent flow in cylindrical pipes,boundary layer theory,and numerical calculation methods.The results show a strong correlation between pollutant concentration and ventilation speed.The relationship between concentration of pollutants c and section wind speed v is:c∝v-1,the relationship between concentration of pollutants c and ventilation distance x is:c∝x,when the section wind speed increases from 0.15 m/s to 0.30 m/s,the concentration of pollutants in the same section can be reduced by 50%By increasing the cross-sectional wind speed or reducing the ventilation distance,the concentration of pollutants in the tunnel can be effectively reduced,thereby preventing the accumulation of pollutants in the water conveyance tunnel.

关 键 词：输水管道 污染物扩散 拟合函数 数值模拟 

分 类 号：TV554.9[水利工程—水利水电工程] X169[环境科学与工程—环境科学]