摘要
为了研究具有高耐磨性、高腐蚀性等特点的固体颗粒在液-固流化床的颗粒流态化特性,采用不同粒径的氧化铝、氧化锆、轴承钢在垂直玻璃圆柱形立管中进行实验,研究液-固流化床中颗粒的最小流态化速度。实验结果得到5种不同颗粒的最小流态化速度,将实验值与经验公式计算值进行比较,验证传统经验公式的计算精度与实验数据的可用性,以及颗粒密度和颗粒粒径对最小流态化速度的影响规律;根据实验结果,采用最小二乘法,在传统经验公式的基础上提出一组新的修正系数,用以计算粒径较大的固体颗粒的最小流态化速度。当直径大于2.5 mm、临界雷诺数大于175时,此式计算精度更高。
In order to study the particle fluidization characteristics of solid particles with high wear resistance and high corrosion in liquid-solid fluidized bed,aluminum oxide,zirconia and bearing steel with different particle sizes were used to conduct experiments in vertical glass cylindrical riser,and the minimum fluidization velocity of particles in liquid-solid fluidized bed was discussed.The experimental results obtained the minimum fluidization velocity of five different particles.The experimental values were compared with the calculated values of empirical formula to verify the calculation accuracy of traditional empirical formula and the availability of experimental data,as well as the effects of particle density and particle size on the minimum fluidization velocity.According to the experimental results,using the least square method,a new correction coefficient was proposed based on the traditional empirical formula.When the diameter is greater than 2.5 mm and the critical Reynolds number is greater than 175,the calculation accuracy of this formula is higher.
作者
刘阿珍
张卫义
李汉勇
李星波
LIU Azhen;ZHANG Weiyi;LI Hanyong;LI Xingbo(Department of Environment and Life,Beijing University of Technology,Beijing 100124,China;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《中国粉体技术》
CAS
CSCD
2021年第3期43-49,共7页
China Powder Science and Technology
基金
国家自然科学基金项目,编号:51774046。
关键词
液-固流化床
流态化
最小流态化速度
颗粒特性
liquid-solid fluidized bed
fluidization
minimum fluidization velocity
particle property
