摘要
气液混合时间和体积传质系数是气升式反应器设计和放大的重要参数。采用实验与流体动力学CFD数值模拟技术相结合的方法对气升式内环流反应器的气液两相混合和溶氧过程开展研究。以欧拉-欧拉模型为基础,利用标准k-ε及多尺度气泡(MUSIG)模型耦合Higbie渗透理论进行计算,对反应器内气液两相流的混合和氧传质进行CFD数值模拟。考察示踪剂进样位置和表观气速对混合时间的影响,并研究表观气速对体积传质系数的作用规律。结果表明:示踪剂注射位置越靠近曝气区,气液混合时间越小,在一定表观气速下,混合时间随着表观气速的增大而减小,体积传质系数则随着表观气速的提高而增大,CFD数值模拟结果与实验结果较好吻合,进一步验证了CFD数值模拟技术在气升式反应器设计和放大中的可行性。
The gas-liquid mixing time and the mass transfer coefficient are two important factors in the design and scale-up of the reactor. The gas-liquid mixing and oxygen dissolving by the combination of experiments and CFD simulation in an internal loop airlift reactor was studied. Based on Euler-Euler model,the standard k-ε and MUSIG model with Higbie penetrate theory was used to simulate in the gasliquid mixing and oxygen transfer. The effect of different injection positions and superficial gas velocity on the gas-liquid mixing time,and effects of the superficial gas velocity on the volumetric mass transfer coefficient were considered. It was showed that the injection position was closer to the aeration zone,the mixing time was shorter. Under a certain superficial gas velocity,the mixing time decreased along with the increasing of superficial gas velocity,but the volumetric mass transfer coefficient increased. The simulation results agreed well with the experimental data,which further verified the good application of CFD simulation in the design and scale-up of the airlift reactor.
作者
李干禄
韦策
吴昊
贺仁涛
吴兵
姜岷
欧阳平凯
LI Ganlu;WEI Ce;WU Hao;HE Rentao;WU Bing;JIANG Min;OUYANG Pingkai(College of Biotechnology and Pharmaceutical Engineering,Nanjing Tech University,Nanjing 211800,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2018年第4期118-124,共7页
Journal of Nanjing Tech University(Natural Science Edition)
基金
产学研联合创新资金-前瞻性联合研究项目(BY2014005-07)
江苏省自然科学基金(BK20140940)
江苏省生物质绿色燃料与化学品重点实验室开放基金(JSBGFC14005)
江苏高校品牌专业建设工程一期项目(PPZY2015B155)
