温度对煤尘水分蒸发特性的影响规律研究

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

为了探究深井高温对煤尘水分蒸发特性的影响规律,对4组煤尘在不同温度下(25、30、35、40、45、50℃)进行恒温蒸发实验,通过分析煤尘水分蒸发速率、最大失水率、蒸发平衡时间3个参数随环境温度的变化规律,研究了温度对煤尘水分蒸发特性的影响。结果表明:煤尘蒸发过程分为蒸发失水阶段与失水平衡阶段;随环境温度增加,煤尘蒸发速率与最大失水率呈近直线增加、煤尘蒸发平衡时间呈对数下降;温度从25℃升高到50℃后,4组煤尘蒸发速率平均提高2倍,煤尘最大失水率平均升高24.57%,煤尘蒸发平衡时间由200 min以上降低到了80 min左右,平均下降63.3%。

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%.