Numericla Simulation Research On Suppressing Emission Of Dugt In Guide Chute With The Use Of Reflux Pipe

Dust pollution decreases the service life of the mechanical parts. It cancause an explosion or fire, and also damage Human Respiratory System,especially the injury of Alveolar. It can harm human health. Dust is producedby the air shearing and the collision between materials. Inhalation of airparticles (particle-size are less than10μm) were the main research object ofdust in the guide chute.The reflux pipe, the guide chute, and the blanking pipe in the unpowereddust collector were studied. In order to investigate the dusting effect ofunpowered dust collectors in different sizes, mathematical and theoreticalmodels with coupling effects between the dust and the air were built. Thesolid structure of the unpowered dust collector was constructed by GAMBITsoftware. User defined function (UDF) was imported into the FLUENTsoftware to achieve numerical simulation. Physical and mathematical models of the inner flow in unpowered dust collectors of different sizes were built. Thevelocity vector field and the static pressure field in unpowered dust collectors were three-dimensional numerically simulated using k ε equation. Collectionefficiencies of the gas-solid two phase recirculation in unpowered dustcollectors of different sizes were calculated by the static pressure difference.The numerical results are summarized as follows:1. When grid spacing is80mm and grid number is180,000, error value of thestatic pressure is less than2%. It is neglected, and optimum grid number is180,000. It can guarantee accuracy of calculating and decrease the memoryrequirement of calculation.2. The analysis of the velocity vector field in unpowered dust collectors andthe static pressure results show that, the inner of unpowered dust collectors isnegative pressure, and there is no dust overflow phenomenon.3. The static pressure results of the reflux pipe indicate that when thediameter of reflux pipe is500mm, upward sloping for10degrees, and thedistance between the inlet height of the blanking pipe and the refluxing nozzle is1400mm in the unpowered dust collector, the pressure difference is larger, andthe refluxing effect is obvious. It can make it easier for dust collision takingplace between them or between itself and the wall, thereby enabling micro-dustgathered into larger particles of dust, eventually settling on a coal conveyor belt,with the coal conveyor belt transported in order to achieve the purpose ofeliminating dust. 4. The numerical results can provide an important technical reference forunpowered dust collector designers, and they have practical application value.