【摘要】 取向性是柱状粒子的一个重要特性,研究柱状粒子取向性,对柱状粒子的运动姿态对循环流化具有非常重要的影响。根据实际冷态循环流化床的结构及运行参数,采用数值模拟方法,对床内的气固两相流场进行了模拟,研究并阐述了柱状粒子的运动姿态的一些特性。柱状粒子多以竖直姿态在流场中运动;流场风速及床高对柱状粒子的取向性有一定的影响,而柱状粒子的长径比及密度对柱状粒子的取向性没有明显的影响。更多还原

【Abstract】 The circulating fluidization of columnar particles has extremely wide applications in industrial production.Orientation represents a major characteristic of columnar particles.The movement posture of columnar particles exercises a very important influence on circulating fluidization.Depending on the actual structure and operating parameters of a cold-state circulating fluidized bed,a simulation was performed of a gas-solid two-phase flow field in the bed by using a numerical simulation method along with the study and exposition of some characteristics of the movement posture of columnar particles.In most cases,the columnar particles move in the flow field with an upright posture.The wind speed of a flow field and bed height have a certain influence on the orientation of the columnar particles but the length-diameter ratio and density of the latter have no obvious influence on the orientation of the particles in question.更多还原