Development and application of a new compound wetting agent for coal seam water infusion

Zhang, Chao; Wang, Xinglong; Li, Shugang; Jiang, Bingyou; Zhai, Cheng; Zhu, Chuanjie; Guanhua, Ni

doi:10.1016/j.fuel.2021.122767

Cited by 24 publications

(10 citation statements)

References 17 publications

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“…The mix of surfactants can significantly ameliorate the surface wetting performance of coal dust. , In this study, six common surfactants were selected, which were purchased from Usolf Chemical Co., Ltd., and Table presents detailed information about them.…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…Hence, prewetting of coal is required. Water injection in coal seam has the advantages of prewetting and reducing the coal particles despite the wetting effect is not obvious. – Several kinds of methods to upgrade the wettability has been around for ages, consequently, including adding chemical agents to the solution to reduce the contact angle and the hydrophobicity of coal. – At present, surfactants as water injection additives have been extensively discussed and applied in coal mines, which are compelling importance to the prevention and control of dust.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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Green biosurfactants are emerging as a promising area of research. However, there is a limited focus on the adsorption and wetting characteristics of biosurfactants on coal dust. This study explores the effects of sophorolipid (SL) biosurfactants on the microstructure and wettability of different coalification degree coal. The microstructure parameters of SL adsorbed on coal dust were measured using a surface tensiometer, contact angle analyzer, and particle size analyzer. The results indicate that SL has the lowest critical surface tension, leading to a 9.25°decrease in the contact angle for low-rank bituminous coal (YZ-LRBC). Furthermore, SL significantly altered the particle size distribution of lignite (NM-LC) and YZ-LRBC. The pore size structure of SL-infiltrated coal dust was quantified using a specific surface area analyzer, revealing a decrease in the specific surface area and an increase in the average pore size. The infrared analysis demonstrated that SL permeation significantly increased the percentage of hydrophilic functional groups (hydroxyl structures) while reducing the hydrophobic functional groups (aliphatic hydrocarbon and aromatic structure). Based on the measured microstructure parameters, a regression equation for contact angle was established: [contact angle (°)] = 73.800 − 0.860 × [D10 (nm)] + 4.280 × [specific surface area (m 2 /g)]. Notably, the characteristic particle size D10 had a significant negative effect on the contact angle, while the specific surface area had a significant positive effect. These findings provide a theoretical foundation for the application of biosurfactants in water injection to reduce dust and improve the wetting efficiency.

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Section: Experiments and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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“…Surfactants, imidazole ionic liquids, and acidizing modification perform well in increasing the wettability of coal. However, these technologies generally face problems including a complex process, high cost, and environmentally unfriendly nature, which make these technologies difficult to be applied in mining fields of coal mines. − Therefore, it is an urgent demand to develop an environmentally friendly wetting agent with a good wetting effect, a simple preparation process, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Zhao,

Tian,

Xie

et al. 2023

Ind. Eng. Chem. Res.

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It has been proven that SiO2–H2O nanofluids have great application potential for water injection in coal seams. To explore the influences of the particle size on the stability and wettability of SiO2–H2O nanofluids, sedimentation observation of nanoparticles (NPs), viscosity tests, pH tests, surface tension tests, and contact angle tests were performed for SiO2–H2O nanofluids with different particle sizes. The research shows that the larger the particle size of SiO2 NPs, the more obvious the aggregation and sedimentation of NPs. The smaller the particle size of SiO2 NPs is, the lower the surface tension and contact angle of the SiO2–H2O nanofluids. As time goes on, SiO2–H2O nanofluids successively show time-varying characteristics in the low stability stage, moderate stability stage, and high stability stage. Therein, the low stability stage is the optimal period for enhancing the water injection in coal seams by nanofluids. The research provides theoretical support for using SiO2–H2O nanofluids to enhance water injection in coal seams.

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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%

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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Development and application of a new compound wetting agent for coal seam water infusion

Cited by 24 publications

References 17 publications

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

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

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Development and application of a new compound wetting agent for coal seam water infusion

Cited by 24 publications

References 17 publications

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

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

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Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes