非定常工作条件下流化床内粒子分布的实时测量及动力学分析

项目名称： 非定常工作条件下流化床内粒子分布的实时测量及动力学分析

项目编号： No.51275409

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 刘凯

作者单位： 西安理工大学

项目金额： 80万元

中文摘要： 节能减排是我国应对全球气候变化的国策之一，循环流化床作为一种高反应效率以及热传导效率的化学反应式废气处理系统，在节能减排中起到重要的作用。本课题以非定常工作条件下循环流化床内的多相流的动力学特性研究为目的，采用电容层析成像这种先进可视化技术， 获取不同试验参数条件下各相分布图像信息， 并以此为依据分析循环粒子大小， 密度，床体摆动强度，频率等重要参数对床内流体动力学特性的影响，找出影响各相分布的均匀性及稳定性的主要因素，提出非定常条件下床内流体动力学性能的优化方案，进行实验验证。另外，建立连续相以及离散相的流体数学模型，利用数值仿真并结合实验研究的结果，揭示影响各相分布的均匀性以及稳定性的主要因素及其变化规律。该项目的研究将填补目前对循环流化床内流体在摇摆或定倾斜等不安定工作条件下的动力学性能研究的缺乏。为循环流化床在船舶废气处理系统等复杂工作条件下的高效应用提供理论及技术

中文关键词： 电容层析成像；摆动循环流化床；颗粒分布特性；非惯性系；

英文摘要： Recently, it has been estimated that around 15% of the global NOx and 5-8% of the global SOx emissions are attributable to ships. In some regions, depending on the season, the emission contribution from shipping may reach much higher levels than the global average. Therefore, an exhaust gas treatment system in a ship is very important for energy conservation and environmental protection. This report put forward a proposal of applying circulating fluidized bed (CFB) into the exhaust gas treatment system to restrict the shipping emissions and improve the heat recovery rate. Circulating fluidized bed is popular devices that can provide excellent heat transfer and reaction property due to its ability to promote high levels of contact between gases and solids. Due to the potential applications and advantages, the study of circulating fluidized bed has received considerable attention in the past three decades and these studies provide detailed information of the flow dynamics characteristics. However, in these studies the circulating fluidized bed is always considered as a motionless land plant. And there are almost no studies about the flow properties in the circulating fluidized bed under swing motion can be found. Thus, the application of circulating fluidized bed in the shipping is still very limited now. Because

英文关键词： Electrical capacitence tomography；Rolling circulating fluidized bed；Particle distribution behaviour；Non-inertial frame of reference；