摘要
逆向-同向流气浮(CCDAF)工艺是集逆向流碰撞与同向流粘附于一体的新型气浮工艺,其构造形式、几何尺寸和工艺参数是实现逆向流碰撞、同向流粘附的必要条件。为此,建立了8个CCDAF池模型,流量均为0.5 m^3/h,利用Fluent软件对CCDAF池流场进行数值模拟及工艺优化。模拟结果表明,在接触室上升流速为10 mm/s、分离室分离速度为1.5 mm/s、溶气压力为0.45 MPa、回流溶气水分配比R1∶R2为1∶1左右的条件下,CCDAF池内流态最佳,接触室内气体分布均匀,分离室内气相呈阶梯式均匀分布,无明显扰动回流,气相分布合理。根据模拟结果建立0.5 m^3/h的中试装置,试验结果表明,CCDAF的除污效果显著,明显优于同向流及逆向流气浮工艺。
Countercurrent-cocurrent dissolved air flotation(CCDAF)process is a new dissolved air flotation(DAF)process which integrates countercurrent collision and cocurrent adhesion,and the structure,geometric size and process parameters are the necessary conditions for realizing countercurrent collision and cocurrent adhesion.Eight CCDAF models were established with flow rate of 0.5 m^3/h,the flow field of CCDAF tank was numerically simulated and the process was optimized by Fluent software.The flow pattern of the CCDAF tank was the best,when the upflow velocity of the contact chamber was 10 mm/s,the separation velocity of the separation chamber was 1.5 mm/s,the dissolved pressure was 0.45 MPa,and the distribution ratio of reflux dissolved air water(R1∶R2)was about 1∶1.The gas distribution in the contact chamber was uniform,and the gas phase in the separation chamber was stepped uniformly distributed without obvious disturbance reflux,indicating that the gas phase distribution was reasonable.According to the simulation results,a pilot plant of 0.5 m^3/h was built.Pilot test results showed that CCDAF had good pollutants removal performance and was obviously better than the cocurrent flow and countercurrent flow DAF processes.
作者
林清丽
王永磊
王萌萌
LIN Qing-li;WANG Yong-lei;WANG Meng-meng(Department of Urban Rail Transit,Shandong Polytechnic,Jinan 250104,China;School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Branch,China Urban Construction Design&Research Institute Co.Ltd.,Jinan 250101,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第23期28-34,共7页
China Water & Wastewater
基金
山东省自然科学基金资助项目(ZR2016EEM32)
住房城乡建设部科学技术计划与北京未来城市设计高精尖创新中心开放课题项目(UDC2017031612)
关键词
气浮
逆向流
同向流
流场模拟
工艺优化
dissolved air flotation
countercurrent flow
cocurrent flow
flow field simulation
process optimization
