不同挡板絮凝反应器流场的实验研究  

Study on the flow fields in different baffled flocculation reactors

作　　者：孙姣[1,2] 崔绍华[1] 孙泽沾[1] 康勇[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]河北工业大学化工学院,天津300130

出　　处：《化工进展》2012年第8期1700-1706,共7页Chemical Industry and Engineering Progress

基　　金："十一五"国家重大新药创制科技重大专项综合性新药研究开发项目子课题(2009ZX09301-008)

摘　　要：采用激光多普勒测速(LDV)技术,对带有4种类型挡板的絮凝反应器内的流场情况进行了实验测量,对比了安装有直挡板、带孔直挡板、弧形挡板及正弦挡板的絮凝反应器流场中的速度分布、湍动能及功率准数。结果表明:在搅拌桨相同的情况下,扰流挡板对反应器流场的整体影响较小,而对挡板附近的流场具有不同程度的影响。不同挡板反应器中,平均轴向速度相差较小,而平均径向、切向速度、湍动能及功率准数相差较大。与直挡板相比,带孔直挡板、弧形挡板和正弦挡板的设置分别使挡板附近流场的最大平均径向速度提高了0.043Utip、0.025Utip和0.058Utip,最大平均切向速度提高了0.023Utip、0.019Utip和0.038Utip,最大湍动能提高了0.016Utip2、0.015Utip2和0.021Utip2,功率数降低了0.98%、1.33%和5.78%。得出结论:合理的挡板形式可以有效地解决絮凝流场混合不均的问题,强化絮凝反应流场,改善絮凝效果,降低能耗,提高絮凝的经济效益。The flow fields of the flocculators with different baffle in the shape of vertical,perforated,arc and sine were studied respectively by LDV.The velocity and turbulent kinetic energy along with power number were compared in different types of baffled reactor.It shows that the flow fields in different baffled flocculators with the same type of pitched blade turbine（PBT） were generally axial circular flow,while the design of baffle has some degree impact on the flow filed in the circulation zone near the baffles.In different baffled flocculators the mean axial velocities have little difference,while the mean radial,tangential velocities,turbulent kinetic energy and power number have larger variation.In the flow field near the baffles,the average radial velocity increased by 0.043Utip,0.025 Utip and 0.058 Utip,the average tangential velocity increased by 0.023 Utip,0.019 Utip and 0.038 Utip,and the turbulence kinetic energy increased by 0.016 Utip2,0.015 Utip2 and 0.021 Utip2,for perforated,arc and sine baffles respectively,compared to that of the vertical baffles.Furthermore,the energy consumption was reduced by 0.98%,1.33% and 5.78%,respectively.Reasonable structure of baffles can effectively resolve the problem of non-homogeneous mixture,intensify the flow field of flocculation reaction,improve flocculating effect,reduce energy consumption,and enhance economic benefit.

关 键 词：挡板 絮凝 反应器 流场 

分 类 号：TQ051.7[化学工程]