Wang Tianyang, Liu Jianguo, Wang Shu, Jin Longzhe, Lin Minglei, Ou Shengnan
National Health Commission Key Laboratory for Engineering Control of Dust Hazard, University of Science and Technology Beijing, Beijing, 100083, China.
Research Institute of Macro-Safety Science, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing, 100083, China.
Environ Sci Pollut Res Int. 2023 Mar;30(14):39857-39870. doi: 10.1007/s11356-022-25036-8. Epub 2023 Jan 5.
This paper determines the optimal surfactant concentration for enhancing coal's wettability and explores the wetting mechanism at surfactant concentrations above the critical micelle concentration (CMC) during coal seam water injection. In this study, laboratory experiments and field tests were used to investigate the influence of monomeric surfactants and compound surfactants at various concentrations on coal's wettability. The results showed that when the surfactant solution concentration was greater than the CMC, the coal's wettability was significantly enhanced as the surfactant concentration increased. However, the coal's wettability did not monotonically increase with the concentration, and the maximum value was reached in the range of 0.5-3 wt.%. Increasing the surfactant adsorption density and changing the adsorption state on the coal surface were the essential reasons surfactants continued improving the coal's wettability at concentrations above the CMC. The Marangoni flow effect and changes in the viscosity of the surfactant solution with concentration were also important factors that affected the coal's wettability.
本文确定了提高煤润湿性的最佳表面活性剂浓度，并探讨了煤层注水过程中表面活性剂浓度高于临界胶束浓度（CMC）时的润湿机理。在本研究中，通过实验室实验和现场测试，研究了不同浓度的单体表面活性剂和复合表面活性剂对煤润湿性的影响。结果表明，当表面活性剂溶液浓度大于CMC时，随着表面活性剂浓度的增加，煤的润湿性显著增强。然而，煤的润湿性并非随浓度单调增加，在0.5-3 wt.%范围内达到最大值。提高表面活性剂吸附密度和改变其在煤表面的吸附状态是表面活性剂在浓度高于CMC时持续改善煤润湿性的主要原因。Marangoni流动效应以及表面活性剂溶液粘度随浓度的变化也是影响煤润湿性的重要因素。
