磁絮凝反应器设计及流态模拟  

Design and simulation of flow field for magnetic flocculation reactor

作　　者：解清杰[1] 刘兴[1] 吴春笃[1,2] 王延民[1] 朱国锋[1] 

机构地区：[1]江苏大学环境学院,江苏镇江212013 [2]扬州环境资源职业技术学院,江苏扬州225000

出　　处：《江苏大学学报（自然科学版）》2010年第4期473-477,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家"十一五"重大水专项基金资助项目(2008ZX07317-001);江苏省科技支撑(社发)计划项目(BE2008615)

摘　　要：基于磁场效应能够改善絮凝剂性质,提高絮凝效果,设计了一种磁絮凝反应器.以亥姆霍兹线圈为思路提出了5对圆形线圈组构的技术方案,实现由1 nT到100 mT磁感应强度的连续可调,同时利用MATLAB模拟了亥姆霍斯线圈内部的磁场分布,采用改进的k-ε双方程模型对反应器内流场进行了数值模拟.结果表明,亥姆霍斯线圈内部磁场可近似看作匀强磁场;在反应器反应区存在涡流,从而有利于矾花的形成;在磁场作用下,能改变固体颗粒的运动,增加固体颗粒间碰撞几率,进而提高反应器絮凝效果.最后进行了反应器效果验证,在20 m in内对污水中SS、CODCr和TP去除率分别达96.7%,45.3%和96.0%,比一般絮凝工艺具有明显优势.The property and effect of flocculent can be improved under the magnetic field. A magnetic flocculation reactor was designed based on the magnetic effect. Five pairs of circular magnetic coils constitute a large measuring range magnetic field generator by utilizing Helmhohz coil, and the reactor can be adjusted continuously from 1 nT to 100 mT. Then the magnetic field distribution in Helmhohz coil was simulated by MATLAB. The improved k -ε two equation model was used to simulate the wastewater velocity distribution in the reactor. Results indicated that the magnetic field in Helmholtz coil could be seen as uniform magnetic field. There were rotational flow zones in the reactor, which had advantage of the formation of flocs. The motion of the solid particles could be modified in the magnetic field, and the probability of collision could be enhanced. Finally the effect of magnetic flocculation reactor was tested. The removal rate of SS, CODCr, TP were up to 96.7% ,45.3% and 96.0% respectively in 20 min. Magnetic flocculation has obvious advantages compared to traditional floceulation craft.

关 键 词：反应器 磁絮凝 数值模拟 磁场线圈 污水处理 

分 类 号：X703.1[环境科学与工程—环境工程]