ABSTRACT
To improve the dust removal efficiency of gas–water nozzle spray in coal mine workplaces of high-concentration dust, gas–water nozzle atomization characteristic parameters have been realized through experiments, and the changing rule between droplet average diameter and gas/water flow was concluded. This paper studied the dust removal process of gas–water spraying in comprehensive tunneling face, establishing the corresponding mathematical model, deducing the relation formula for gas–water nozzle spray efficiency, drawing the curve of dust removal efficiency by using MatLab. The research shows that, on the one hand, when the water flow remains constant, dust removal efficiency increased with the increase of gas flow, on the other hand, when the gas flow remains constant, dust removal efficiency first increased and then decreased as the water flow increased. There exists the best gas–water flow ratio to maximize the dust removal efficiency. The larger the dust size, the easier the dust could settle. Based on the dust size distribution and removal requirement of dust in working face, both a better dust removal effect and economic benefit can be achieved by choosing the best gas/water flow ratio, with reference to the relationship curve.
