Influence of Atomization Parameters of Gas-Liquid Two-Phase Spray on Dust Reduction Effect of Fully Mechanized Excavation Face
In order to systematically study the influence of atomization parameters of gas-liquid two-phase spray on the dust reduction effect of respirable dust in the fully mechanized excavation face,taking the excavation face of the 42207 auxiliary roadway of a coal mine in northern Shaanxi as the prototype,a geometric model of spray dust reduction in the excavation face under the condition of single press-in ventilation was established.The effects of droplet spraying speed,droplet size and droplet density on the dust reduction effect of respirable dust at the height of the driver's breathing zone were systematically analyzed by numerical simulation methods.The results show that under the condition that the droplet size is 5 × 10-6 m and the mass flow rate of nozzle is 0.005 kg/s,the dust mass concentration increases first and then decreases with the increase of droplet spraying speed.When the droplet spraying speed is 30 m/s,the dust mass concentration at the height of the driver's breathing zone decreases from 1000 mg/m3 in the non-spray state to 168 mg/m3,the dust reduction efficiency is 83.2％,and the dust reduction effect is better.Under the conditions of mass flow rate of nozzle of 0.005 kg/s and droplet spraying speed of 30 m/s,when the droplet size is 9×10-7 m,the dust mass concentration is reduced to 148 mg/m3,the dust reduction efficiency reaches 85.1％,and the dust reduction effect is better.When the droplet spraying speed is 30 m/s,the droplet size is 9×10-7 m,and the nozzle mass flow rate is 0.02 kg/s,the dust mass concentration decreases to 102 mg/m3,and the dust reduction efficiency reaches 89.8％.The research results can provide a reference for the optimization of the gas-liquid two-phase spray dust reduction system in the downhole excavation face.
Fully mechanized excavation faceGas-liquid two-phase sprayAtomization parameterRespirable dustDust reduction effectDust reduction of excavation face
万方数据
维普
