单管多旋构件诱导静态混合器内气液两相非稳态流动及混合增强机理研究

项目名称： 单管多旋构件诱导静态混合器内气液两相非稳态流动及混合增强机理研究

项目编号： No.21306115

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 禹言芳

作者单位： 沈阳化工大学

项目金额： 25万元

中文摘要： 单管多旋静态混合器作为新型气液混合设备，在氯醇化管道反应新工艺生产环氧丙烷和乙烯直接氯化制二氯乙烷等工业化生产中表现出卓越的强化传质性能。为了揭示周期性变截面螺旋流道诱导气液两相非线性瞬态动力学特性及混合增强机理，首先，利用多相流流体力学方法和高分辨率粒子图像测速仪相结合对静态混合器内进口空管段、过渡分流段、移位汇合段、出口空管尾流段内气泡群瞬态演变行为进行分析，考察气液流速、液体物性、多旋流道结构和尺寸等对气泡聚并、破裂过程及周围液相流场时空分布的影响；其次，基于瞬态压力波动特征和气泡形态图像建立气液两相流型图，并根据其复杂网络社团结构进行流型在线识别；最后，以Navier-Stokes方程和对流-扩散方程为基础，结合PLIF实验，对其开展气液界面浓度分布特性和混合机理的研究，定量分析多旋混合元件较Kenics改善混合器内的浓度分布和强化混合效果状况，为其工业化进一步推广提供理论支持。

中文关键词： 静态混合器；两相流；混沌混合；气含率；传热

英文摘要： The static mixer with multiple spiral flow passages has been proposed as a novel gas-liquid mixing equipment. It has been successfully applied in the industrialized production of dichloroethane by direct chlorination of ethylene and propylene oxide by chlorohydrination in tubular reactor dichloride. During the past years, the static mixers have displayed fantastic performance of mass transfer and mixing intensification in the new processes aforementioned. In order to reveal the instantaneous hydrodynamics characteristics and mixing intensification mechanism in gas-liquid flow, the Time-Resolution PIV and computational fluid dynamics models of gas-liquid flow are employed. Firstly, both the instantaneous evolution characteristics of bubble groups and liquid flow field will be investigated in the different regions, such as in the empty tube region after inlet, flow division and reversal region, flow recombined region and decay region before outlet. The coalescence and collapse behaviors of bubble groups and spatial-temporal distributions of liquid will be evaluated under different velocities, physical properties of mixing medium, structures and sizes of periodic variable cross-section passages, respectively. Secondly, the flow pattern maps of gas-liquid two phase flow will be presented based on the synchronous exp

英文关键词： static mixer；gas-liquid flow；chaotic mixing；gas holdup；heat transfer