Removal of fine particle, smell and heavy metal by use of new type cyclone with spraying mist and electro potential

对改进的干旋流器的切削粒度控制进行了实验和数值研究。与传统旋风分离器相比，新型喷雾旋风分离器具有较高的颗粒分离性能。利用除尘箱入口的顶锥，可以降低除尘箱内的流体速度分量，减少粉尘箱内颗粒的再夹带。切割尺寸表示顶点锥体特定高度的最小值。随着旋风分离器进口速度的增大，最佳顶锥高度逐渐降低。入口流速较低时，顶锥的作用增强。优化后的旋流器顶锥角约为70°，并考察了在旋流器上圆柱形部分加入额外流体后的旋流器分级性能。通过选择附加流位置的特殊部位，可以随着附加流量的增加而减小切割尺寸。进行了三维数值模拟，并与实验数据进行了比较。为了对泥浆流中的细颗粒和重金属进行分级，研制了一种适用于流动的卧式电势水筛。实验结果与数值计算结果进行了比较。测试颗粒为纯二氧化硅，质量中值直径为4.1 μm。考察了进口流量、料浆浓度、施加电位对颗粒分级的影响。结果表明，新研制的水筛对细颗粒和重金属的分离效果较好。

Experimental and numerical studies were conducted about the cut size control with modified dry-cyclone. New type of revised cyclone by use of mist spray showed high particle separation performance compared to the conventional cyclone. By use of the apex cone at the inlet of dust box, it is possible to decrease the fluid velocity component in the dust box and to reduce the re-entrainment of particles from the dust box. The cut size indicated the minimum value for the specific height of the apex cone. The optimum apex cone height changed to the lower position as the cyclone inlet velocity increases. The effect of the apex cone increased under low inlet flow velocity condition. The optimum apex cone angle was about 70 deg.Classification performance of modified cyclone by use of an additional fluid in upper cylindrical part was also examined. By selecting a special part of additional flow position, it was possible to reduce the cut size with the increase of additional flow rate. Three dimensional numerical simulation were also conducted and compared with the experimental data.In order to classify fine particles and heavy metal in slurry flow, horizontal type water sieve with electro-potential applied to flow is newly developed. The experimental classification performances were compared with numerical calculation. Test particles used were pure silica with mass median diameter of 4.1 μm. Effects of inlet flow rate, slurry concentration, applied potential on particle classification were also examined. It is found that the newly developed water sieve is quite effective to separate fine particle and heavy metal.