Near-saturation dust-settling technology driven by gas-liquid-thermal coupling

To solve the problem that the traditional spray dust suppression method cannot efficiently capture the respirable fine dust in coal mine, the high humidity and high temperature two-phase jet dust suppression technology was developed. In this work, a gas-liquid thermodynamic coupling experimental device was designed and built to evaluate the effects of different parameters on the atomization characteristics of this technology and to verify the dust suppression performance. The results indicate the uniformity of the spray distribution and the gas-liquid phase transition can be greatly improved by improving the thermodynamic performance of the system; The flash evaporation effect was intensified and the surface tension of the liquid was reduced under the optimal operation conditions of water supply temperature of 90 °C, gas supply temperature of 100 °C, gas supply pressure of 0.4 MPa and water flow rate of 150 mL/min. The average relative humidity of the whole field was 84.6% with a maximum of 94% locally; the median droplet size (SMD) was 10.71 μm with a dust suppression efficiency of 93.7%. This technology solves the shortcomings of the traditional methods and provides an efficient, innovative technical solution to control respirable dust in the mining industry.