Effect of Coal Mechanodestruction on Formation of Gasdynamic Processes at Coal Layers Underground Mining

Дырдин, В. В.; Fofanov, A. A.; Kim, T.L.; Смирнов, В. Г.; Tatsiyenko, V.P.; Kozlov, A.; Plotnikov, Eugene

doi:10.24000/0409-2961-2017-8-10-15

Cited by 1 publication

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“…However, the influence of the effect of mechanical destruction on the chemical properties of coals and the possible generation of gas was not studied in these works. The role of shear deformation 29 and destructive processes in the microstructure of coal 30 are considered as the key factor in the general scenario for the formation of coal and gas outbursts.…”

Section: Physical Factors Stimulating Gas Formation In Coalsmentioning

confidence: 99%

Changes in the stability of coal microstructure under the influence of weak electromagnetic fields

Bazaluk,

Sobolev,

Molchanov

et al. 2024

Sci Rep

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The article presents experimental results of research concerning the action of weak electric and magnetic fields on physicochemical transformations in samples of hard coal with a previously destabilized microstructure. The actions of electric and magnetic fields are fundamentally different by many parameters. It has been shown that after treatment with a weak electric field, coal posted an electret potential with an anomalously continuous charge relaxation. Compared to untreated coal samples, the rate of methane emission from methane-saturated samples is maximum for long-flame coal and decreases as it approaches anthracite. The electric field stimulates the grinding of microparticles, a decrease in the maximum gas outlet temperature, a decrease in the enthalpy value in the formation of a new phase, and an increase in the chemical activity of treated coal samples. Fundamentally different results were obtained with magnetic stimulation of coals. In X-ray diffractograms of coal powders after magnetic treatment, the values of the maxima of the main peaks are the largest in comparison with the original samples and those treated with an electric field, which is consistent with an increase in the size of microparticles in a magnetic field. There is an increase in the heat of combustion and a decrease (by 5 times) in the loss of coal mass during heating.

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Section: Physical Factors Stimulating Gas Formation In Coalsmentioning

confidence: 99%