原煤对液态水和压力水的吸附特性试验研究  

Experiment of Adsorption Characteristics of Coal on Liquid Water and Pressure Water

作　　者：易亮 邓清芮[3] 刘戎 

机构地区：[1]重庆市市政设计研究院,重庆400020 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [3]重庆电子工程职业学院管理学院,重庆401331

出　　处：《山西煤炭》2017年第4期1-4,16,共5页Shanxi Coal

摘　　要：对煤层进行注水湿润是井下降尘减灾的一项重要措施,为更全面的了解原煤对水的吸附特性,以煤孔隙特征研究为基础,结合物理吸附理论,在恒定温度下,分别对煤样进行液态水(无压水)润湿和压力水注水湿润试验研究。试验结果表明:1)在一定范围内,煤的中值孔径大且退汞率高,则煤吸水速率大。2)在对工作面进行注水降尘时,若煤层中含有较多贯通裂隙,易发生跑水现象,造成水资源浪费,湿润效果不理想。3)煤对水分子的吸附以物理吸附为主,其中范德华力作用占主要地位,而以氢键作用吸附的水分子并不多。4)当水分扩散到微孔时,孔径越小,吸附力越大。Water injection of coal seam is an important measure to reduce coal dust in the mine.Based on the pore characteristics and the theory of physical adsorption,the water injection experiment of coal samples on liquid water（ no pressure water） and pressure water were conducted respectively to know the water adsorption characteristics of coal at constant temperature.The results show that： 1） Within a certain range,if the median pore diameter of the coal sample is big and mercury withdrawal efficiency is high,the water absorption rate of coal will be high too.2） To reduce the dust of the working face with water injection,if there are more transfixion cracks in the coal seam,the water running will occur,causing the waste of water and the poor wetting effect.3） The adsorption of water molecule is mainly physical adsorption,focusing on van der waals force; while the adsorption of water molecule is less hydrogen bonding.4） When moisture diffusing into micro-pores,the smaller the pore diameter is,the larger the adsorption capacity.

关 键 词：原煤 吸附 水分 退汞率 范德华力 

分 类 号：TD713[矿业工程—矿井通风与安全]