Research on the influence of temperature on water evaporation characteristics in coal dust

Abstract

In order to explore the influence of high temperature in deep well on coal dust moisture evaporation characteristics, evaporation tests were conducted with four coal dust samples in the temperature of 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45℃ and 50 ℃, respectively. The effects of temperature on the evaporation characteristics of the moisture in coal dust were obtained by analyzing the evaporation parameters of four coal dust samples, mainly including evaporation rate, the maximum water loss and evaporation balance time. The results show that the evaporation process of coal dust moisture can be divided into two stages, i.e., the evaporation water loss stage and water loss balance stage; with the increasing of temperature, the evaporation rate and the maximum water loss rate of coal dust increased linearly, and the evaporation balance time decreased in a logarithmic trend; after the temperature increased from 25 ℃ to 50 ℃, The average evaporation rate of coal dust in 4 groups increased by 2 times, the maximum water loss rate increased by 24.57%, and the evaporation balance time was reduced from over 200 min to about 80 min with an average decrease of 63.3%.

Keywords

• deep mine
• coal dust explosion
• high-temperature heat damage
• coal dust moisture
• evaporation characteristic
• dast control