Study On The Synergetic Dust Suppression Law Of Pneumatic Ventilation Dust Collector And Air-water Two-phase Spray

With the rapid development of China’s coal industry,issues such as pneumoconiosis,coal dust explosions,and environmental pollution are increasingly receiving public attention and attention.Gas water two-phase spray dust suppression and wet dust collector are commonly used underground dust removal methods.In this paper,based on the research of air water two-phase spray dust suppression technology and wet dust collector dust suppression technology at home and abroad,combined with their dust removal characteristics and advantages,air water two-phase spray dust suppression system is installed in the pneumatic ventilation dust collector to achieve the coordinated dust suppression of the two.The main conclusions are as follows:Through conducting dust self settling tests in pneumatic ventilation dust collectors,it was found that the influence of self gravity and external factors on the overall concentration variation of coal dust is not significant.According to the microscopic classification of particle size dust transport patterns,it was found that the trend of dust concentration change is not significant within the range of 2-3 meters behind the dust collector.From the microscopic particle size distribution pattern,it can be seen that the proportion of respirable dust in this area significantly increases.The atomization characteristic parameters,such as atomization angle,Field of fire,spray flow rate,axial droplet size and velocity in the fog field,were tested by using three kinds of air-water two-phase nozzles,namely wide angle circle,pressure circle and pressure sector.The results showed that the atomization angle of pressure sector nozzle was greater than the other two kinds of air-water two-phase nozzles,and the effective distance in the spray field was stable.The particle size range of pressure fan nozzle spray field is 35～50 μ m.The axial droplet size and total velocity are smaller than the other two nozzles.Therefore,it is preferable to conduct collaborative dust reduction experiments with pressure fan-shaped nozzles and pneumatic ventilation dust collectors.Through the collaborative dust reduction effect experiment of the gas-water two-phase nozzle and the pneumatic dust collector,the influence rules of factors such as the distance between the nozzle and the dust collector fan,the nozzle water supply pressure,the nozzle gas supply pressure,and the dust collector gas supply pressure on the dust reduction effect were obtained.From the orthogonal experimental results,it can be seen that the significance ranking of various factors affecting dust reduction efficiency is as follows: distance between nozzle and fan>nozzle water supply pressure>fan air supply pressure>nozzle air supply pressure.The optimal configuration of the experimental system working conditions is: the distance between the 2.25 m nozzle and the fan,the supply pressure of the 0.5MPa nozzle,the supply pressure of the 0.4MPa gas-water nozzle,and the supply pressure of the pneumatic dust removal fan is 0.2MPa.Through the combination of gas water two-phase spray and wet dust collector,the collaborative dust removal experiment was carried out,and the optimal configuration of dust removal system under working conditions was obtained.The research results provided basic theoretical support for dust prevention in coal mines and enriched the methods of coal mine dust prevention.Figure 50 Table 18 Reference 93...