煤尘润湿性能试验

Experiments on Wetting Performance of Coal Dust

煤矿粉尘防治手段主要有煤层注水和喷雾降尘,煤尘润湿性能对降尘效果影响显著,而煤尘粒径和表面活性剂是影响煤尘润湿性能的重要因素.为了研究煤尘粒径和表面活性剂对煤尘润湿性能的影响,以某煤矿6种粒径煤尘样品为试验对象,选取4种表面活性剂(SDS,SDBS,Tween-80以及OP-10)开展煤尘微观特性和润湿性能试验.结果表明:煤尘粒径越小,其比表面积越大,平均孔径越小,煤尘的润湿性越差;同一煤质的煤尘润湿效果随着粒径的减小而降低;煤尘的润湿效果随表面活性剂的变化而变化,4种表面活性剂对煤尘的润湿效果大小为OP-10>SDBS>SDS>Tween-80,溶液中表面活性剂的质量分数超过0.05%时,煤尘的润湿性能基本无提升.在实际应用中使用表面活性剂OP-10和SDBS会比较经济实惠.

The main methods for controlling coal mine dust are coal seam water injection and spray dust suppression,and the wettability of coal dust significantly affect the dust suppression effect.The particle size of coal dust and surfactants are important factors that influence the improvement of coal dust wettability.To study the effects of coal dust particle size and surfactants on coal dust wettability,six coal dust samples of different particle sizes from a coal mine are selected as test subjects,and f our surfactants(SDS,SDBS,Tween-80,and OP-10)are chosen to conduct experiments on the micro-characteristics and wettability of coal dust.Results show that the smaller the coal dust particle size,the larger the specific surface area;the smaller the average pore size,the poorer the wettability of the coal dust.The wettability of coal dust of the same coal quality decreases with the reduction of particle size.The wettability of coal dust varies with different surfactants,with the effectiveness of the four surfactants on coal dust wettability ranking as follows:OP-10>SDBS>SDS>Tween-80.When the mass fraction of surfactants in the solution exceeds 0.05%,the wettability of coal dust shows no significant improvement.In practical applications,using surfactants OP-10 and SDBS is more cost-effective.