一种限高流化床内布风板结构的数值模拟

A Numerical Simulation of Air Distribution Plate Structure for a Fluidized Bed with Limited Height

现代工业中流化床具有广泛的应用,流化床内布风系统的结构决定了送风流场的均匀程度和固体颗粒的流化状态,因此做好反应器内布风系统的结构设计至关重要。本文针对一种限定送风腔体高度为600 mm的流化床反应器,利用Fluent软件对其布风板的开孔形式及布风位置进行了数值模拟计算和优化。结果表明:布风板高度为300 mm;圆形布风板采取中心小孔、沿径向往外孔径逐渐增大、边沿处孔径再减小的开孔方法,可使布风腔出口风速达到设计值下的均匀分布状态。

Fluidized bed has been widely used in modern industry,whose ventilation system determines the velocity uniformity of the supply flow field and the fluidized state of the solid particles.Therefore,it is of great significance to design the structure of the internal wind-distribution system improperly and efficiently for the fluidized bed reactor.In this paper,the Fluent software was used to make a series of numerical simulation for designing and optimizing the structure of a wind-distribution plate including its hole-opening style and placed position,for a fluidized bed with the wind supply cavity of limited height 600 mm.Results show that the wind-distribution plate adopts the following design that the velocity of the outlet flow can reach a uniform condition:i)the wind-distribution plate is placed at the height of 300 mm;ii)the method of small hole opened at the center of the circular plate,larger holes with gradually increased diameter opened towards the radius-increased direction,and smaller holes again opened at the edge area.