Effects of wind velocity and cross spray on atomizing characteristics and dust removal efficiency of spray field

To improve the wind-resistant and capturing dust ability of a dust control spray, the influence of wind velocity and cross spray on the atomizing and dust control performances of spray field were investigated based on the self-constructed system. The results showed that the wind velocity had a certain weakening effect on the atomizing and dust suppression ability of a single spray, especially when the wind velocity exceeded 1.5 m/s, the condensation behavior between droplets increased and dust control efficiency decreased significantly. Meanwhile, the jet direction of a spray field was obviously deviated after 1.5 m/s, being harmful to the construction of a dust control spray. In contrast, cross spray could obviously enhance the wind-resistant ability of a dust control spray, while also enhancing coal dust control performance. For example, the cross spray formed by nozzles with a spacing of 10 cm had a 33.3 % increase in a critical wind velocity, from 1.5 m/s to 2.0 m/s; and showed a better atomizing and dust control characteristics than that of a single spray. Field application indicated that compared with that of the original spray, the newly constructed spray showed a better ability in controlling coal dust, of which control efficiency of total dust and respirable dust could be improved by 20.1 %, 24.4 %, reaching to 87.9 %, 83.8 %, respectively.