Effect of acetic acid concentration on functional group and microcrystalline structure of bituminous coal

Yu, Yanbin; Yang, Haotian; Cheng, Weimin; Gao, Chengwei; Zheng, Lei; Xin, Qilin

doi:10.1016/j.fuel.2020.119711

Cited by 38 publications

(26 citation statements)

References 44 publications

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“…The acidification process of coal can be divided into three stages: initial contact, crystal destruction, and attenuation. 18 After acetic acid treatment, some minerals and the fatty side chains and bridge bonds of organics will be corroded and destroyed respectively, resulting in a rough coal sample surface, increased exposed pore type and quantity, and increased porosity. The pore channels of pores with different shapes in coal samples increase, the pore surface becomes smooth, and the pore structure becomes complex.…”

Section: Discussionmentioning

confidence: 99%

“…For acetic acid, its mass fraction is also greater than 20%. 17 , 18 If they are adopted for chemical modification through underground construction, they may not only pose potential threats to personnel safety and coal quality but also cause water pollution. Therefore, on the basis of previous studies, we select easily degradable anionic, cationic, non-ionic surfactants and low-concentration acetic acid to prepare a composite solution of different components for analyzing.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Modification Effect of Compound Solutions of Surfactants with Acetic Acid on Coal Pores

Xie

Chen

et al. 2021

ACS Omega

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Coal seam pores are the major places for coalbed methane storage, diffusion, and seepage, and changes in the pore structure cause changes in the porosity. The porosity of coal seams can be effectively improved by applying strongly corrosive and oxidative chemical reagents to coal seam pores, but these reagents may pose threats to coal workers, corrode mining equipment, and pollute the environment. In this study, coal samples were treated with solutions compounded by acetic acid and anionic, cationic, and non-ionic surfactants. The variations of pores in coal samples after the compound modification of surfactants and acetic acid were investigated. Experimental methods of SEM, MIP, LTNA, PAC, and FTIR and fractal theory are applied in this work. The results reveal that the compound modification of surfactants and acetic acid conduces to the transformation of pore shape and affects a wider pore size range. The anionic and cationic surfactants can increase the hydrophilicity and can promote the connection of larger pores. The non-ionic surfactant reduces the hydrophilicity and capillary effect yet increases the porosity. Thus, it promotes the connection of pores and makes the pore surface smooth and the pore structure simple. Comparing the three kinds of surfactants, non-ionic surfactants are more conducive to coal seam pore reconstruction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Modification Effect of Compound Solutions of Surfactants with Acetic Acid on Coal Pores

Xie

Chen

et al. 2021

ACS Omega

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“…At present, high-pressure water injection is commonly used in coal mine production (Yu et al 2021;Yang et al 2021;Talapatra 2020). The high-pressure water injection seepage is affected by the combined action of in-situ stress and water pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Coal is a complex dual-porosity porous medium that consists of both fractures and coal matrices containing pores. Cheng et al used the pressure pulse attenuation method to test the permeability of the standard top dead center core (Yu et al 2021;Cheng et al 2020). It is concluded that the destruction of the connected pore-fracture structure and the formation of many pore-throat and sandbox pores are the vital reasons for the decrease of permeability and the high failure rate of permeability.…”

Section: Introductionmentioning

confidence: 99%

The seepage characteristics of coal under the hydraulic-mechanics coupling conditions considering the variation of porosity

Zhang

Cheng

et al. 2021

Arab J Geosci

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In order to study the seepage law of coal under the hydraulic-mechanics coupling conditions, the seepage characteristics under different axial stresses and water pressures were carried out using the multifield coupling seepage test system. Results show that the porosity increases as the water pressure rises. Stress is the basis factor of leading to changes in seepage properties. The relationship model between water pressure and porosity was established. The UDF program of porosity variation with water pressure was loaded into FLUENT for the dynamic numerical simulation study of seepage. The simulation results show that at a certain water pressure, the greater the axial stress is loaded, the greater the velocity as well as the range of infiltration within the coal will be. When the stress conditions are fixed, with the increases of water pressure, the seepage velocity and the range of infiltration are also greater. It can be seen that stress and water pressure have a significant influence on water injection seepage. Comparing the simulated results of permeability with the experimental results, it is found that the simulated results with fixed porosity bring larger deviations compared with the experimental ones. The simulation results considering the variation of porosity are closer to the experimental results.

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“…In recent years, the mining level of mechanization and automation of coal mines in China has been gradually improved [1][2][3], and the disasters caused by the production process of coal mines have become increasingly prominent [4][5][6]. In particular, the dust hazards in underground working areas have seriously threatened the safety of mine production and the physical and mental health of miners [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Atomization and Dustfall Characteristics of Combined Nozzles for Shearer External Spray in Fully Mechanized Coal Mining Face

Wang

Song

Wang

et al. 2021

Advances in Civil Engineering

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To explore the dustfall effect of combined nozzles used in a fully mechanized mining face, Phase Doppler Interferometry (PDI) system was used to test 6 types of high-efficiency atomizer under 8 MPa. A new nozzle group of nozzles 2#, 3#, and 5# is selected by atomization experiment. The atomization experiment and field application test of the preferred nozzle are performed. The experiment and field application results show that, with the spray pressure of 8 MPa, when the distance in the nozzle group is 200 mm and the angle change is 10 degrees, the atomization effect is the best. Under the optimal parameters, the average dustfall rates of the entire and respirable dust are 81.82% and 79.96%, respectively, which are 23.49% and 20.75% higher than those of the traditional shearer.

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Effect of acetic acid concentration on functional group and microcrystalline structure of bituminous coal

Cited by 38 publications

References 44 publications

Chemical Modification Effect of Compound Solutions of Surfactants with Acetic Acid on Coal Pores

Chemical Modification Effect of Compound Solutions of Surfactants with Acetic Acid on Coal Pores

The seepage characteristics of coal under the hydraulic-mechanics coupling conditions considering the variation of porosity

Experimental Investigation on Atomization and Dustfall Characteristics of Combined Nozzles for Shearer External Spray in Fully Mechanized Coal Mining Face

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