In the process of coal seam water injection, the components of different fracturing fluids have different effects on coal. To analyze the effect of water injection fracturing fluid on the physical and chemical properties of coal, we studied the relationship between guar-based fracturing fluid and cationic clean fracturing fluid (C-VES). Microscopic experiments show that guar-based fracturing fluid has a certain viscosity effect on coal, while C-VES can adsorb and capture the primary coal dust in coal. FTIR analysis shows that C-VES has a great change on the content of coal functional groups, and guar-based fracturing fluid has little effect on coal. Industrial analysis shows that C-VES can better reduce the ash content of coal and has a certain impact on the thermal efficiency of coal than guar based fracturing fluid. Combustion characteristic experiment shows that guar-based fracturing fluid does not affect the combustion effect of coal, and C-VES can expand the exothermic temperature range of coal but has little effect on the main combustion of coal. Molecular dynamics simulation results show that C-VES has the best wetting effect on coal. This research provides theoretical guidance for dust prevention and improving the use and conversion efficiency of coal.

在煤层注水过程中，不同压裂液组分对煤的影响不同。为分析注水压裂液对煤理化性质的影响，研究了瓜尔胶基压裂液与阳离子清洁压裂液（C-VES）的关系。微观实验表明，瓜尔胶基压裂液对煤具有一定的黏度作用，而C-VES可以吸附捕集煤中的原生煤尘。FTIR分析表明，C-VES对煤的官能团含量变化较大，瓜尔胶压裂液对煤的影响不大。工业分析表明，C-VES比瓜尔胶压裂液能更好地降低煤的灰分，对煤的热效率有一定的影响。燃烧特性实验表明，瓜尔胶压裂液不影响煤的燃烧效果，C-VES可以扩大煤的放热温度范围，但对煤的主燃烧影响不大。分子动力学模拟结果表明，C-VES对煤的润湿效果最好。本研究为粉尘防治、提高煤炭利用转化效率提供理论指导。