项目名称： 粉-粒喷动床内纵向涡流强化多相传递机理分析及模拟优化

项目编号： No.21476181

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 有机化学

项目作者： 吴峰

作者单位： 西北大学

项目金额： 80万元

中文摘要： 传统喷动床内的介质颗粒具有明显的内外分层流动特点，床层内颗粒缺少横向混合，使得部分颗粒的表面未能获得充分利用，对床内传热传质产生不利的影响。针对这一缺陷，本项目提出一种新颖的带纵向涡流发生器导流板的喷动床结构来改善喷动床内的传热、传质过程。通过粒子图像测速法测速技术获取粉-粒喷动床内的整场瞬态流动信息，考察粉-粒喷动床内水汽化过程中纵向涡流对床层尺度的传递、混合及换热特性的影响规律。在理论分析方面，构建气体/颗粒/料浆三相间的传热、传质耦合过程的数学物理模型，发展粉-粒喷动床水汽化过程三维数值模拟模型；采用多流体模型模拟分析粉-粒喷动床内水汽化过程多相间热、质耦合传递的非稳态过程；模拟分析纵向涡发生器的攻角、数量、布置间距及外形尺寸等关键参数对喷动床内整体流动、传热及传质的影响规律，并对喷动床结构及运行参数进行模拟优化，为粉-粒喷动床脱硫过程的设计及放大提供理论依据。

中文关键词： 喷动床；多相流；纵向涡流；传递强化

英文摘要： It is disadvantageous for heat and mass transfer in traditional spouted bed because of laminated flow of particle and gas in the transverse direction of spouted bed.A novel spouted bed structure is developed to solve this problem, which is consisted of a guide plate with the longitudinal vortex generators.The Particle Image Velocimetry measurement (PIV) technique is adopted to obtain the transient flow infromation of multiphase in the power-particle spouted bed. The effect of longitudinal vortex generator on the fluid flow,mixture and heat transfer characteristics of bed layer in the multiphase chemical reations of powder and liquid drops are investigated, also the coupling characteristics of multi-scale between gas, liquid and solid on the liquid drop and powder scale are analysised. The heat and mass transfer coupled model is built to investigate the interphase transmission of the gas, particle and slurry. The three-dimensional numerical simulation model is built, the two-fluid model are adopted to simulate the transient process of multphase transmision in the powder-particle spouted bed. The optimizations for critical paremeters of vortex generator, i.e., the attack angle, size, number and position of longitudinal vortex generatior，are permormed. These research works are beneficial to the optimal design and amplification work of powder-particle spouted bed.

英文关键词： spouted bed;multiphase flow;longitudinal vortex;enhanced transfer process