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

采用新型旋流器喷雾电势去除细颗粒、异味、重金属

基本信息

批准号：
17560661
负责人：
YOSHIDA Hideto
金额：
$ 2.24万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

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.

对改进型干式旋风分离器的粒度控制进行了实验和数值研究。与传统旋风分离器相比，采用雾化喷雾的新型旋风分离器具有更高的颗粒分离性能。通过在除尘器入口处使用顶锥，可以降低除尘器内的流体速度分量，并减少颗粒从除尘器中的二次卷吸。切割尺寸表示顶端锥体的特定高度的最小值。随着旋风分离器入口风速的增大，最佳顶锥高度向较低位置移动。在低进口流速条件下，顶锥的作用增强。最佳顶锥角为70°左右，并考察了改进型旋风分离器在上部加入附加流体后的分级性能。通过选择一个特殊的附加流动位置，可以减小切割尺寸随附加流量的增加。为了对泥浆流中的细小颗粒和重金属进行分级，研制了一种新型的卧式带电势流动水筛。将实验分级性能与数值计算结果进行了比较。试验颗粒为质量中值直径为4.1μm的纯二氧化硅，考察了入口流量、浆料浓度、外加电势对颗粒分级的影响。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。