Study on the influence of coal particle size and evaporation time on water evaporation

In this paper, the cumulative water evaporation of coal particles with different scales and different evaporation time is analyzed by laboratory test method, and the change law of water evaporation and evaporation time of coal particles with different scales is obtained. The results show that the cumulative water evaporation of coal samples of different scales increases with the increase of evaporation time, and the water evaporation loss is faster in the early stage of evaporation experiment. During the same evaporation time, the larger the coal particle size, the smaller the cumulative water evaporation amount. The water evaporation amount of 10mm coal particle sample is the largest, followed by 20mm coal sample, and 50mm coal sample is the smallest. The larger the coal particle size, the shorter the duration of rapid evaporation and the shorter the time for the cumulative evaporation to stabilize. Coal particle size is directly related to coal water evaporation, basically showing a trend that the larger the coal particle size, the shorter the rapid evaporation duration and the smaller the cumulative water evaporation amount. The main reason is that the smaller the coal particle size, the more particles, the larger the overall particle surface area, the larger the air contact area, and the more water loss. The research results provide basic support for the later application of coal seam water injection dust removal engineering.