【作者】 董栋栋；

【导师】 陈建义；

【作者基本信息】 中国石油大学 ， 化工过程机械， 2008， 硕士

【摘要】 为了预测高温下浓度对分离器性能的影响,本文选用一个直径300mm的切流返转式旋风分离器,在常温到673K的温度范围内进行了性能试验研究。试验用粉料为二氧化硅与滑石粉,其中位粒径分别为16μm和16.5μm;入口浓度的变化范围2g/m3-60g/m3。试验测定了不同粉料入口气速、温度、浓度下旋风分离器的分离效率与压降。结果表明:①使用二氧化硅作为分离粉料时,分离效率随浓度的增加而降低;使用滑石粉作为分离粉料时,分离效率随浓度的增加而增加;②相同粉料时,旋风分离器的粒级效率随着浓度的变化趋势与分离效率一致;③随着浓度的增加,旋风分离器的压降成下降趋势,但是用滑石粉做的试验相对降低的趋势不如二氧化硅试验的明显;④使用二氧化硅作为试验粉料时,随着温度的升高,旋风分离器的分离效率下降。但是使用滑石粉作为试验粉料时,旋风分离器的分离效率随着温度的升高而升高;⑤随着温度的增加,旋风分离器的压降成下降趋势,在其他条件保持不变的情况下,粉料自身的性质对旋风分离器的能耗影响不是很大。通过对已有试验结果的分析,表明:旋风分离器的粒级效率是斯托克斯数、雷诺数、弗劳德数以及一系列无因次尺寸参数的函数。结合以前的研究工作,本文还得出了分离性能与有关无量纲参数间的关系,而且温度和浓度对分离效率和压降影响的理论计算值与试验结果较吻合。更多还原

【Abstract】 In order to predict the influence of operating temperatures and concentration on cyclone performance, an experimental investigation was conducted on particle separation in a reverse flow, tangential volute-inlet cyclone separator, which had a diameter of 300 millimeters, with air heated up to 673K. The test powder silica had a mass median diameter of ca. 16 microns and the test powder talcum had a mass median diameter of ca. 16 microns. The inlet concentration ranged from 2g/m3~60g/m3. Both the separation efficiency and pressure drop of the cyclone were measured as a function of the inlet velocity and operating temperature. Firstly, for silica powder, the separation efficiency decreased with the increase of concentration; but for talc powder, the separation efficiency increased with the rise of concentration. Secondly, the fractional efficiency exhibited the same trend as the separation efficiency when the dust concentration changed. Thirdly, for both test powders, an increase of dust concentration all resulted in a lower pressure drop though not to the same extent.. Forthly, as the temperature rised, the separation efficiency became higher for talc powder but lower for silica powder. Finally, With the increase in temperature, the pressure drop of a cyclone tended to fall with other conditions remained unchanged. It seemed that the physical property of the test powder had little influence on the cyclone pressure drop.An analysis of our own data and published results showed that the fractional efficiency of a cyclone was a definite function of such dimensionless numbers as Stokes number, Reynolds number, Froude number and dimensionless cyclone inlet area and dimensionless outlet diameter. A non-dimensional experimental correlation of the cyclone performance, including the influence of temperature, was obtained on the basis of previous work. The prediction of the influence of temperature on separation efficiencies and pressure drops was in fairly good agreement with experimental results.更多还原