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流化床内细长颗粒\惰性物料混合流化特性研究

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Keywords: 细长颗粒(秸杆),流化特性,细长颗粒\惰性物料混合流化,固相分相模型

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Abstract:

将空气和惰性物料(石英砂)处理成连续相,采用欧拉方法计算,将细长颗粒(秸杆)视作离散相,采用拉格朗日方法追踪其运动轨迹,从而建立起固相分相模型.基于此模型数值研究了流化床内细长颗粒\惰性物料混合流化特性.研究发现,在提升管内,由中心向壁面附近区域,细长颗粒的数量浓度有明显的增加;在充分发展区域,细长颗粒的数量浓度分布与提升管入口处浓度分布相似;细长颗粒的取向分布有明显的趋向性,以近于竖直姿态流化运动的细长颗粒的数量百分比明显占优势.

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