基于CFD的渗滤液输运管道结垢特性的数值模拟  

NUMERICAL SIMULATION ON SCALING BY LEACHATE PIPE TRANSPORT BASED ON CFD

作　　者：赵锐 杜森 李敏 刘妍 张路子平 ZHAO Rui;DU Sen;LI Min;LIU Yan;ZHANG Luziping(Faculty of Geosciences and Environmental Engineering,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《环境工程》2023年第3期111-118,128,共9页Environmental Engineering

基　　金：国家重点研发计划专项(2019YFC1905600);国家自然科学基金项目(41571520);四川省青年科技创新团队资助(2022JDTD0005);四川省区域创新合作项目(2022YFQ0040);四川循环经济研究中心课题(XHJJ-2002);中央高校基本科研业务费专项资金(2682021ZTPY088)。

摘　　要：为缓解垃圾渗滤液输运对管道的结垢影响,设计了渗滤液浸置管材的结垢实验,以实验数据驱动计算流体动力学建模,模拟了渗滤液在直管和90°弯管中的结垢变化趋势,探究了不同管型中垢物的沉积变化特征,分析了温度、流速、管壁粗糙度、垢物粒径等因素对垢物沉积的影响。结果表明:渗滤液输运管道垢物中无机垢和有机垢的占比分别为75.6%和24.4%,垢物晶体成分主要是CaCO3,伴有少量NaCl;垢物沉积量与温度呈正相关,与流速、污垢粒径呈负相关,壁面粗糙度对沉积量影响相对较小;直管和90°弯管2种管型内垢物在多个影响因素作用下的平均沉积率分别为1.26%和7.45%,90°弯管内垢物沉积量显著大于直管。该研究结果可为渗滤液输运管路系统设计与优化提供科学依据。To mitigate the scaling by landfill leachate pipe transport,this study designed a fouling experiment by placing the pipe materials into the leachate.The computational fluid dynamics modelling was driven by the experimental data,to simulate the scaling process when the leachate flowing a straight pipe and 90°elbow-shaped pipe,respectively.The characteristics of scale deposition regard to the two pipe shapes were discriminated,and the impacts of different factors,including temperature,flow velocity,pipe wall roughness,scale particle size etc.,were investigated.The results showed that the proportions of inorganic scale and organic scale in the scales by leachate pipe transport were 75.6%and 24.4%,respectively.The crystal composition of the scales was mainly CaCO3,accompanied by a small amount of NaCl.The scale deposition was positively correlated with temperature,negatively correlated with velocity and scale particle size,while pipe roughness had little effect on the deposition.The scale deposition in the 90°elbow-shaped pipe was larger than that in the straight pipe,and the average deposition rate regarding the straight pipe and 90°elbow pipe was 1.26%and 7.45%by the simulation.The research results can provide insight into the optimal design for the leachate pipe transport system.

关 键 词：渗滤液 CFD 结垢 模拟 输运管道 

分 类 号：X703[环境科学与工程—环境工程]