筒体直径对旋风分离器性能的影响

摘要

Cylinder diameter was an important structural parameter of the cyclone.In this paper, a series of laboratory cyclone model experiments were carried out to investigate the effect of the cylinder diameter on Stairmand cyclone performances.The cylinder diameter was 200 mm, 300 mm and 400 mm, and the powder was microsilica.The results showed that, according to the geometric similarity to enlarge cyclone, if the inlet velocity was the same, with the increase of the cylinder diameters, the collection efficiency of the cyclone decreased and the pressure drop increased.Moreover, if gas flow rate was the same, with the increase of the cylinder diameters, the collection efficiency of the cyclone decreased and the pressure drop decreased.As the inlet size was fixed, if enlarging other dimensions with geometric similarity, namely inlet velocity and gas flow rate remained unchanged, with the increase of the cylinder diameters, the collection efficiency of the cyclone increased and the pressure drop decreased.In addition, under the experimental conditions, the comparison between the computations of several recent performance prediction models and the experimental date, showed that the theoretical models could predict the tendency of cylinder diameter effects on cyclone performances.%筒体直径是影响旋风分离器效率和压降的重要结构参数.以硅微粉为原料,在保证几何结构相似的基础上,对筒体直径分别为200、300、400 mm的Stairmand型旋风分离器进行冷态对比实验,考察了不同情形下筒径对旋风分离器分离性能的影响.结果表明,旋风分离器按几何相似放大,筒径增大,在同一入口气速下,分离效率下降而压降升高;在同一处理气量下,分离效率和压降都下降.如将入口尺寸与处理气量固定,其它尺寸按几何相似放大,筒径增大则旋风分离器的分离效率增加、压降降低.进而又用几个较新的分离模型对实验进行了计算比较,发现模型计算结果与实验结果的趋势大体一致,基本上能预测筒径变化对旋风分离器分离效率与压降的影响趋势,但都不能定量计算筒径对其分离性能的影响.