Study on the influence of dusty weather natural wind on the dust characteristics of trough concentrator regions in alpine areas

Abstract

Based on the coupling effect of wind speed and atmospheric particulate concentration, in this study, the dust migration process in different transversal regions of the trough concentrator under three dusty weather conditions, floating dust, blowing dust and sandstorms in alpine areas, is investigated in outdoor experiments. Quantitatively assess the dynamic migration characteristics of dust deposition and removal on the concentrator by measuring its instantaneous reflectivity. The conclusions are as follows: during dusty weather, most dust particles transported by high wind speeds deposit in the lower concentrator region. The reflectivity of each region shows a decreasing trend from top to bottom when the concentrator tilt angle is 60°. The most serious contamination is observed in blowing dust weather, with a maximum decrease of 38.36% in reflectivity in transversal region 1 over 4 hours. Meanwhile, the natural wind has a positive cleaning effect on the floating dust weather, most cleaning factors of each transversal region are greater than 1, and cleaning overall shows that the blowing dust is greater than the sandstorm than the floating dust weather. In addition, the cleaning factor of the lower concentrator region is up to 1.66, significantly higher than the upper, since the high wind speed is the dominant force in removing large dust particles. The findings can provide theoretical guidance for efficient dust removal after different dusty weather conditions in alpine areas, and the dust removal strategy matched to different concentrator regions can be targeted.