为了提高表面活性剂对烟煤的润湿性,探讨其对烟煤的润湿性和润湿性机理,以三道沟烟煤为例,首先进行了单因素实验。通过接触角和表面张力实验,从9种表面活性剂中选择3种具有良好润湿性的表面活性剂,并以相等的比例两两混合,以确定最佳的混合方法和混合浓度。实验结果表明,非离子和阴离子的复配,非离子和两性离子,阴离子表面活性剂和两性离子表面活性剂可以起到协同作用,显著提高烟煤的润湿性。其中,0.5wt%SDS+0.5wt%CAB-50(R2)复合表面活性剂对烟煤的润湿性最好,接触角和表面张力仅为15.24°和23.62mN/m,分别。基于量子化学方法,利用MaterialsStudio软件计算各材料分子的表面静电势值,并与润湿性进行了相关性分析。结果表明,CDEA的表面静电势,SDS和CAB-50高于水和烟煤,最大负静电势的区域对应于氧原子,更容易吸附在烟煤和水分子上。然后,通过分子动力学模拟,研究了平衡时水/复合表面活性剂/烟煤系统的相互作用能和沿Z轴的贡献分布,最后,在三道沟煤矿进行了喷雾降尘试验。结果表明,0.5wt%SDS+0.5wt%CAB-50复合溶液可以作为水分子吸附载体,促使更多的水分子嵌入到煤分子中,增加烟煤表面水分子的相对浓度,限制水分子的扩散,大大提高了润湿性。加入0.5wt%SDS+0.5wt%CAB-50作为喷雾剂后,驾驶员位置的总粉尘浓度从65.14下降到9.11mg/m3,呼出粉尘浓度从30.07下降到3.35mg/m3,与纯水相比,总粉尘和呼出粉尘的降低效率分别为86.01%和89.35%,分别。
To improve the wettability of surfactants on bituminous coal and to explore its wettability and wettability mechanism on bituminous coal, taking the Sandaogou bituminous coal as an example, a single factor experiment was carried out first. Through contact angle and surface tension experiments, three surfactants with good wettability were selected from among the nine surfactants and mixed in equal proportions two by two to determine the optimal
compounding method and
compounding concentration. The experimental results show that the
compounding of nonionic and anionic, nonionic and zwitterionic, anionic and zwitterionic surfactants can have synergistic effects and significantly improve the wettability of bituminous coal. Among them, the 0.5 wt% SDS + 0.5 wt% CAB-50 (R2) compound surfactant had the best wettability on bituminous coal, and the contact angle and surface tension were only 15.24° and 23.62 mN/m, respectively. The surface electrostatic potential values of each material molecule were calculated by Materials Studio software based on the quantum chemistry method, and correlation analysis was carried out with wettability. The results show that the surface electrostatic potentials of CDEA, SDS and CAB-50 were greater than those of water and bituminous coal, and the region of maximum negative electrostatic potential corresponded to oxygen atoms, which are easier to adsorb on bituminous coal and water molecules. Then, through molecular dynamics simulation, the interaction energy and the distribution of contributions along the Z-axis of the water/compound surfactant/bituminous coal system at equilibrium were investigated, and finally, a spray dust reduction test was carried out in the Sandaogou Coal Mine. The results showed that the 0.5 wt% SDS + 0.5 wt% CAB-50 compound solution can be used as a water molecule adsorption carrier, prompting more water molecules to be embedded into coal molecules, increasing the relative concentration of water molecules on the surface of bituminous coal, restricting the diffusion of water molecules, and greatly improving the wettability. After the addition of 0.5 wt% SDS + 0.5 wt% CAB-50 as a spray agent, the concentration of total dust at the driver\'s position decreased from 65.14 to 9.11 mg/m3, the concentration of exhaled dust decreased from 30.07 to 3.35 mg/m3, and the efficiency of total and exhaled dust reduction compared with that of pure water was 86.01% and 89.35%, respectively.