螺旋管式二次流混合器的混合性能  

Mixing performance of helical secondary-flow mixer used in coagulation

作　　者：刘丹 张忠国[1,2] 赵可卉 栾兆坤[3] 程言君 李继定[2] 荣立明 宋云 

机构地区：[1]轻工业环境保护研究所,北京100089 [2]清华大学化学工程系,北京100084 [3]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085

出　　处：《化工学报》2011年第10期2707-2712,共6页CIESC Journal

基　　金：国家高技术研究发展计划项目(2009AA063901);国家科学技术部科研院所技术开发研究专项资金项目(2008EG111021;2010EG111021);北京市优秀人才培养资助项目(20071D1100500388)~~

摘　　要：考察了以聚合氯化铝(PACl)作为混凝剂时,混合器的曲率、螺距、管长、水流速率以及混合过程的GT值等对螺旋管式二次流混合器混合性能的影响。研究发现,混合器的管长、水流速率以及曲率对该混合器混合性能具有高度显著影响,而螺距具有显著影响,四者影响的显著性由高到低依次为管长、水流速率、曲率和螺距;实验范围内,二次流管的最佳长度为12 m,且在电中和及卷扫混凝时均出现两个最佳GT值。The effects of curvature, pitch, tube length, flow rate and GT value （the product of root- mean-square velocity gradient and detention time） of a helical secondary-flow mixer used in coagulation with polyaluminum chloride （PAC1） on its performance were investigated. The helical secondary-flow mixer was prepared by twining a rubber tube round a cylinder, and kaolin suspension was used as simulated wastewater for this experiment. It was found that tube length, curvature and flow rate of the mixer had highly significant impacts on mixing effect, similarly pitch had significant impact. And the impacts of the four factors decreased as follows： tube length, flow rate, curvature and pitch. 12 m was the optimal tube length among three tube lengths of 12 m, 18 m and 24 m. As for electrically neutral coagulation, the secondary-flow mixer with a tube length of 24 m also achieved an excellent mixing effect. In addition, there existed two optimal GT values for both electrically neutral and sweep coagulation. Theoptimal GT values were 21000 and 35000 for the former, former, and 19000 and 32000 for the latter.

关 键 词：混凝 絮凝 混合器 二次流 聚合氯化铝 

分 类 号：X703.3[环境科学与工程—环境工程]