摘要
光是影响光生物反应器培养效率的最主要因素之一。而在一定的外部光强下,光生物反应器内部的混合状况对微藻细胞生长有重要影响。采用CFD(Computational Fluid Dynamics)模型对一种新型多节隔板-平板式光生物反应器在不同通气量下的流场分布进行了模拟并与PIV(Particle Image Velocimetry)测量结果进行比较,结果表明CFD模型可用于光生物反应器流场的模拟;利用CFD模型对不同隔板节数的平板式光生物反应器的内部流场进行了模拟,对光照方向混合进行定量研究,并通过分析光照方向径向速度U、下降通道体积平均湍动能ADT、流体(藻液)绕隔板循环一周所用时间tc、下降通道(光区)停留时间占藻液绕隔板循环一周所用时间的比例ε四个参数来优化光生物反应器的隔板节数。理论分析表明,三节隔板-平板式光生物反应器为最佳选择,并通过球等鞭金藻3011培养实验对此进行了验证。
Light is one of the most important factors affecting the photoautotrophic cultivation of microalgae, and the hydrodynamic performance, especially mixing, has great effects on the microalgae growth in photobioreactor （PBR） under a certain exterior light intensity. The hydrodynamic performance of a novel flat PBR with multistage-separator was simulated at different aerating rates by using computation fluid dynamics （CFD） model. The experimental results of the Particle Image Velocimetry （PIV） validate that the CFD model can be used to simulate the hydrodynamic performance of the flat-PBR with multistage-separator well. Based on this result, CFD simulation was applied to compare the hydrodynamic performance of the PBR with different separator numbers, and their mixing effects in illumination direction were investigated quantitatively. The stage numbers of the separator of PBR was optimized by analyzing its effects on radial speed （U）, average turbulence kinetic energy （ADT）, cycle time of PBR （to） and the ratio of cycle time of the downer channel to cycle time of PBR （ε）. The theoretical analysis results show that the PBR with three-stage separator is optimal, and this prediction was also confirmed by the experimental results oflsochrysis galbana 3011 cultivation.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第2期263-269,共7页
Journal of Chemical Engineering of Chinese Universities
基金
"十一五"国家科技支撑计划项目(2006BAD09A12)
"十一五"863计划项目(2007AA09Z419)和(2007AA02Z209)
