化工进展2017，Vol.36Issue(6)：1997-2009,13.DOI:10.16085/j.issn.1000-6613.2017.06.005
正方形流化床结构参数改变和内构件强化的数值模拟解析
Analysis for numerical optimization on square fluidized bed with altering structural parameters and internals reinforcement
摘要
Abstract
Analysis on fluid dynamic behavior of multi-functional fluidized-bed reactor by numerical simulation method can reduce the amount of scale-up experiments,as well as find out the description of the reactor structure in biological wastewater treatment. This paper takes the convenient square fluidized-bed for consideration on construction(civil engineering). Three kinds of changing structural parameters like rising area to drop area ratio(Ad/Ar),annular area to drop area ratio(Ab/Ar)and distance between draft tube and liquid surface to the height of tube ratio(Ht/Hdt),added with two inner-components(cross-shaped internal and funnel-shaped internal),were investigated to inspect liquid feature response behavior under different liquid velocities and gas-holdup situations,aiming at looking for the optimization of structure and operating conditions for realizing high-efficiency oxygen mass transfer,energy conservation and shortcut nitrification-denitrification. The results indicated thatAd/Ar, Ab/Ar andHt/Hdt mainly influence distribution and peak of liquid,the direction and velocity of liquid at the bottom and effective rectification above diversion tube,respectively,which is recommended to take 1.25,1.2 and 1/8 in due order. Based on the optimization of structural parameters,the coupling effect of two inner-components in fluidized-bed is able to satisfy the requirement of low liquid velocity and gas-holdup in different biological stages. It has been proved that numerical simulation of CFD can achieve the functional development of reactor under different wastewater treatment systems. The square fluidized-bed reactor with optimized structural parameters and inner-component has the characteristics of strengthening mass-transfer and region functionalization,which makes the combination of these two aspects and fulfill the object of efficient energy utilization and research and development cost reduction.关键词
气液两相流/流化床/结构优化/内构件/计算流体力学Key words
gas-liquid flow/fluidized bed/structural parameters/internals/CFD分类
资源环境引用本文复制引用
陈梓晟,张涛,麦礼杰,吴锦华,胡成生,韦朝海..正方形流化床结构参数改变和内构件强化的数值模拟解析[J].化工进展,2017,36(6):1997-2009,13.基金项目
广东省应用型科技研发专项基金(2015B020235005)、国家自然科学基金(51278199,21406096)及江西省青年科学基金计划(20142BAB213022)项目. （2015B020235005）
