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.

对改进的干式旋风分离器的切割尺寸控制进行了实验和数值研究，与在除尘箱入口处使用尖锥的传统旋风分离器相比，使用喷雾的新型改进旋风分离器显示出更高的颗粒分离性能。，可以降低集尘箱中的流体速度分量并减少从集尘箱中重新夹带颗粒。切割尺寸表示顶点锥体的具体高度的最小值。最佳顶点锥体。随着旋风分离器入口速度的增加，顶锥的高度变化到较低的位置，在低入口流速条件下，最佳顶锥角度为70°左右。通过在上部添加流体来改进旋风分离器的分级性能。还对圆柱形零件进行了研究，通过选择附加流量位置的特殊零件，可以随着附加流量的增加而减小切割尺寸，并与实验数据进行比较。为了对浆料流中的细颗粒和重金属进行分级，新开发了电势流式水筛，将实验分级性能与数值计算进行了比较，测试颗粒为质量中值直径为4.1μm的纯二氧化硅。还考察了入口流量、浆料浓度、施加电势对颗粒分级的影响，发现新开发的水筛对于分离细颗粒和重金属非常有效。