Study on the influence of new compound reagents on the functional groups and wettability of coal

Liu, Zhen; Zhu, Muyao; Yang, He; Zhao, Dawei; Zhang, Kaimeng

doi:10.1016/j.fuel.2021.121113

Cited by 52 publications

(17 citation statements)

References 19 publications

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“…The situation is similar in China, where pneumoconiosis accounts for more than 90% of occupational diseases, where more than 85% of them are reported in the coal mining industry [20].…”

Section: Introductionmentioning

confidence: 85%

Analysis and Forecasting of PM2.5, PM4, and PM10 Dust Concentrations, Based on In Situ Tests in Hard Coal Mines

et al. 2021

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The method of analyzing the results of dust concentration measurements in mine workings that was conducted within the ROCD (Reducing risks from Occupational exposure to Coal Dust) European project using the developed dust prediction algorithm is presented. The analysis was based on the measurements of average dust concentration with the use of the CIP-10R gravimetric dust meters, for the respirable PM4 dust concentration, and IPSQ analyzer for instantaneous concentration measurements (including PM2.5 dust) and with the use of Pł-2 optical dust meters for instantaneous concentration measurements of PM10 dust. Based on the analyses of the measurement results, the characteristics of the distribution of PM10, PM4, and PM2.5 dust particles were developed for the tested dust sources. Then, functional models based on power functions were developed. The determined models (functions) allow predicting the dust distribution in such conditions (and places) for which we do not have empirical data. The developed models were implemented in a specially developed online tool, which enables predicting the concentration of PM10, PM4, and PM2.5 dust (on the basis of dust concentration of one source) at any distance from the dust source.

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“…The situation is similar in China, where pneumoconiosis accounts for more than 90% of occupational diseases, where more than 85% of them are reported in the coal mining industry [20].…”

Section: Introductionmentioning

confidence: 85%

Analysis and Forecasting of PM2.5, PM4, and PM10 Dust Concentrations, Based on In Situ Tests in Hard Coal Mines

et al. 2021

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“…Liu added different ionic liquids and surfactant compound solutions in water to optimize the different compound solutions and found that a new type of composite wetting agent was prepared, and the wetting mechanism between coal and the wetting agent was clarified from the perspective of functional groups. It was clarified that the wettability of the complex solution was indeed better than that of pure water, and the efficient value of the additive was affirmed . Subsequently, Sun proposed the preparation of three kinds of high-efficiency wetting enhancers and compared the wettability of different solutions by experiment and contact angle analysis to arrive at the best enhancer.…”

Section: Introductionmentioning

confidence: 99%

“…It was clarified that the wettability of the complex solution was indeed better than that of pure water, and the efficient value of the additive was affirmed. 23 Subsequently, Sun proposed the preparation of three kinds of high-efficiency wetting enhancers and compared the wettability of different solutions by experiment and contact angle analysis to arrive at the best enhancer. The molecular dynamics simulation was used to verify the relationship between them, and finally, the mechanism of action was deduced.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Placement Sequences of Water on the Methane Adsorption Properties of Coal

et al. 2023

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After the coal seam is injected with water, the moisture content in the coal body increases, which affects the output capacity of coalbed methane (CBM). In order to improve the effect of CBM mining, the classical anthracite molecular model has been selected. To analyze the influence of different placement orders of water and methane on the characteristics of coal-adsorbing methane from the micro point of view, a molecular simulation method is used for comprehensive consideration in the study. The results show that H2O does not change the mechanism of CH4 adsorption by anthracite, but it inhibits the adsorption of methane by anthracite. When water enters the system afterward, there arises an equilibrium pressure point where water plays the most significant role in inhibiting methane adsorption by anthracite coals, which increases with increasing moisture content. When water enters the system first, no equilibrium pressure point occurs. The excess adsorption of methane by anthracite when water enters second is higher. The reason is that H2O can replace CH4 at the higher energy adsorption sites of the anthracite structure, while CH4 can only be adsorbed at the lower energy sites, and some of CH4 is not adsorbed. For the coal samples with a low-moisture content system, the equivalent heat of adsorption of CH4 increases first rapidly and then slowly with the increase of pressure. However, it decreases with pressure in the high-moisture content system. The variation of the equivalent heat of adsorption further explains the variation of the magnitude of methane adsorption under different conditions.

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“… 10 , 11 To lower the surface tension and enhance the wettability of coal, wetting agents can be incorporated into water. 12 − 14 …”

Section: Introductionmentioning

confidence: 99%

“…During manufacturing and transportation of coal from mines, massive coal dust is produced, which causes pneumoconiosis in coal miners. − Pneumoconiosis is a preventable but incurable lung disease, which not only causes chest pain but also causes significant complications such as chronic cor pulmonale and respiratory failure. − Nowadays, the main dust removal method used in coal mines is spray dust removal. − Water is ineffective in wetting coal dust since its surface tension reaches 72.8 mN/m, while for coal, it is 45 mN/m at critical wetting. , To lower the surface tension and enhance the wettability of coal, wetting agents can be incorporated into water. − …”

Section: Introductionmentioning

confidence: 99%

Experimental and Molecular Dynamics Simulation Study for Preferring Coal Dust Wetting Agents

Sun

Liu

et al. 2022

ACS Omega

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To improve the efficiency of coal dust removal by water spray technology, the addition of wetting agents in water becomes the main dust removal method. The influence of sodium dodecyl sulfate (SDS), sodium dodecyl sulfonate (SDDS), and sodium dodecylbenzene sulfonate (SDBS) on the wettability of coal dust is studied by experimental and molecular dynamics (MD) simulation. Measurement of the contact angle and surface tension was accomplished via relevant experiments for the three wetting agents, and their adhesion work, spreading work, and wetting work were also calculated. A preferred experimental method of conventional coal dust wetting agent is optimized. The wettability of the three wetting agents upon bituminous coal follows the trend: SDS > SDDS > SDBS. The simulation was performed based on MD to derive the intermolecular interaction energy, diffusion coefficient of water molecules, and water molecule count in the vicinity of the hydrophilic groups of the wetting agents. The wetting mechanism and performance of the wetting agent solution on bituminous coal were identified. The simulation results of the wetting performance of the wetting agents are consistent with the experimental results, which verifies the reliability of the simulation method. An easy, time-saving, and labor-saving MD simulation method is proposed, which provides a novel insight for choosing various wetting agents of coal dust.

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Study on the influence of new compound reagents on the functional groups and wettability of coal

Cited by 52 publications

References 19 publications

Analysis and Forecasting of PM2.5, PM4, and PM10 Dust Concentrations, Based on In Situ Tests in Hard Coal Mines

Analysis and Forecasting of PM2.5, PM4, and PM10 Dust Concentrations, Based on In Situ Tests in Hard Coal Mines

Effect of Different Placement Sequences of Water on the Methane Adsorption Properties of Coal

Experimental and Molecular Dynamics Simulation Study for Preferring Coal Dust Wetting Agents

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