加V形导流槽的跑道式藻池CFD模拟  

CFD simulation and study of the V shape flow-guided groove in raceway pond

作　　者：黄文[1] 何开岩[1] 钟水库[1] 谢安[1] 曾威[1] 孙备[1] 

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《化工进展》2013年第8期1759-1764,1770,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51166001)

摘　　要：针对传统跑道池容易出现藻液分层和微藻培养密度低等不足,本文提出了一种具有同时增加表面积体积比和导流作用的透明V形导流槽,并采用CFD模拟了导流槽的V形倾斜角、藻液深度和进气速度对反应器内速度场分布的影响。结果表明:通过导流槽下表面的导流作用,气升混合所影响的范围被扩大到两侧池壁附近的流域,在竖直方向形成了比较均匀的上下层之间的流场循环。从而改善了藻液的混合以及光照条件,也增加了CO2在藻液中的停留时间。优化后的V形导流槽的倾斜率为0.1,藻液深度为0.3 m,进气速度为0.1 m/s。在优化条件下,速度场的分布比较均匀,平均速度适中,有利于防止微藻附壁生长和沉淀,能量消耗也相对较小。Aiming at the drawbacks with algae solution stratify and low density algae cells in the traditional raceway pond,this research designed a V-shape transparent flow guide groove to increase the surface-to-volume ratio and guide the flow,and simulated the influence on the velocity field distribution by the surface gradient of groove,solution depths and air inlet velocity using CFD method.The results showed that in the presence of airlift with the flow guided groove,the mixing area was expanded to the areas near lateral zones on both sides of the raceway pond,and formed a vertical flow cycle between the adjacent layers.The mixing and lighting conditions of the microalgae solution were improved,and the residence time of the carbon dioxide in the solution was also increased.The optimal design parameters were tanθ=0.1,d=0.3 m,vair in=0.1 m/s.Under the optimal conditions,the velocity field distributed evenly,and the mean velocity was suitable for preventing the wall attachment effects and sediment of the algae.In addition,the equipment energy consumption was relatively low.

关 键 词：导流槽 气升混合 计算流体力学 开放式跑道池 藻池 

分 类 号：TQ027.2[化学工程]