Comparison of static tests and dynamic tests for coal dust surfactants evaluation: A review

Zhao, Zhizhong; Chang, Ping; Xu, Guang; Xie, Quan; Ghosh, Apurna

doi:10.1016/j.fuel.2022.125625

Cited by 19 publications

(4 citation statements)

References 63 publications

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“…Surface tension is an important parameter affecting the dust suppression effect. The lower the surface tension is, the better the wettability of coal dust is [ 26 , 27 ]. In this experiment, we use JYW-200B automatic interfacial tension meter to measure the surface tension of surfactant solution at different concentrations.…”

Section: Experimental System and Test Methodsmentioning

confidence: 99%

Study on wetting mechanism of nonionic silicone surfactant on coal dust

Wang

Jing

et al. 2023

Heliyon

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Section: Experimental System and Test Methodsmentioning

confidence: 99%

Study on wetting mechanism of nonionic silicone surfactant on coal dust

Wang

Jing

et al. 2023

Heliyon

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“…Furthermore, Li and Li analyzed the influence of functional groups on the coal wettability by infrared spectroscopy experiments and indicated that oxygen-containing functional groups can effectively improve the hydrophilicity of coal. In addition, many studies have shown that the addition of surfactants can reduce the surface tension of the solution and thus improve the wetting effect of coal seam water injection. , …”

Section: Introductionmentioning

confidence: 99%

“…In addition, many studies have shown that the addition of surfactants can reduce the surface tension of the solution and thus improve the wetting effect of coal seam water injection. 9,10 It is well known that the contact angle is a significant index to characterize the wetting properties of coal samples. However, it should be noted that the contact angle is actually a three-phase (solid, liquid, and gas) contact angle.…”

Section: Introductionmentioning

confidence: 99%

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Study on Coal Wettability under Different Gas Environments Based on the Adsorption Energy

Ding

Wei

et al. 2023

ACS Omega

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Coal seam water injection is a kind of comprehensive prevention and control measure to avoid gas outburst and coal dust disasters. However, the gas adsorbed in the coal seriously influence the coal-water wetting effect. With the deepening of coal seam mining, the gas pressure also gradually increases, but there is still a lack of in-depth understanding of the coal-water wetting characteristics under the high-pressure adsorbed gas environment. Therefore, the mechanism of coal-water contact angle under different gas environments was experimentally investigated. The coal-water adsorption mechanism in pre-absorbed gas environment was analyzed by molecular dynamics simulation combined with FTIR, XRD, and 13C NMR. The results showed that the contact angle in the CO2 environment increased most significantly, with the contact angle increasing by 17.62° from 63.29° to 80.91°, followed by the contact angle increasing by 10.21° in the N2 environment. The increase of coal-water contact angle in the He environment is the smallest, which is 8.89°. At the same time, the adsorption capacity of water molecules decreases gradually with increasing gas pressure, and the total system energy decreases after the coal adsorbs gas molecules, leading to a decrease in the coal surface free energy. Therefore, the coal surface structure tends to be stable with rising gas pressure. With the increase in environmental pressure, the interaction between coal and gas molecules enhances. In addition, the adsorptive gas will be adsorbed in the pores of coal in advance, occupying the primary adsorption sites and thus competing with the subsequent water molecules, resulting in a decline of coal wettability. Moreover, the stronger the adsorption capacity of gas, the more obvious the competitive adsorption of gas and liquid, which further weakens the wetting capacity of coal. The research results can provide a theoretical support for improving the wetting effect in coal seam water injection.

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