Influence of various factors on the atomization and dust suppression characteristics of internal mixing pneumatic atomization nozzles
To investigate the spray characteristics and dust reduction performance of internal-mix pneumatic atomizing nozzles,we measured their atomization and dust suppression capabilities using an independently developed test platform.This platform assesses atomization angle and droplet size,as well as coupling tests for dust and mist.The test results were analyzed to elucidate the effects of the volume median diameter(V50)and Sauter Mean Diameter(SMD)of internal-mix pneumatic atomizing droplets on pneumatic pressure and water flow rate.We also summarized the corresponding droplet size range for internal-mix pneumatic atomization that maximized dust reduction efficiency at various aerosol movement speeds.Additionally,we established a general trend regarding dust reduction efficiency across different aerosol velocities,along with the relationship between dust movement speed and droplet size(SMD).We summarized the relationships among dust movement speed,dust size,and the SMD of internal-mix pneumatic atomizing droplets in order to achieve optimal coupling effects.The results indicate that,within a pneumatic pressure range of 0.2-0.4 MPa and a water flow rate of 10-16 L/h,both the V50 and SMD of the internal mixing pneumatic atomization decrease as pneumatic pressure increases,while they increase with rising water flow rate.Furthermore,the impact of pneumatic pressure on droplet size is more significant than that of water flow rate.When the dust movement speed ranges 1-3 m/s,and the aerosol movement speeds are between 2-5 m/s and＞5-11 m/s,the droplet size of internal mixing pneumatic atomization achieves maximum dust removal efficiency at＞40-50 µm and＞30-40μm,respectively.Additionally,dust removal efficiency increases with larger SMD droplets,demonstrating a consistent overall trend of increasing and decreasing efficiency.At an aerosol velocity of 2-5 m/s,dust reduction efficiency exhibits a"decrease-increase-decrease"pattern with increasing SMD of the droplets.At aerosol velocities of＞5-8 m/s,the trend generally shifts to an"increase-decrease"pattern,while at velocities of＞8-11 m/s,the dust reduction efficiency shows a consistent upward trend.When the aerosol velocity is set between＞8-11 m/s,the dust velocity at 1 m/s,and the SMD of droplets evenly distributed within the range of 20-40 μm,optimal coupling occurs with dust particles across the size range of 0-50 μm,resulting in the highest dust reduction efficiency.This study offers both theoretical foundations and experimental support for the application of internal mixing pneumatic atomization technology in dust coupling scenarios.
safety and hygiene engineering technologyinternal mixing nozzleatomization characteristicsdust and mist couplingdust reduction efficiency
万方数据
维普
