Pymonenko L.I., Burchak O.V., Balalaiev O.K., Slobodiannykova V.K., Sierikov Yи.A. Change of parameters in molecular structure of Donbas coals under the influence of external factors

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 146

Geoteh. meh. 2019, 146, 107-117

 https://doi.org/10.1051/e3sconf/201910900077

Change of parameters in molecular structure of Donbas coals under the influence of external factors

¹Pymonenko L.I.,¹Burchak O.V., ¹Balalaiev O.K., ¹Slobodiannykova V.K.,

¹Sierikov Yи.A.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences ofUkraine

UDC [552.574:552.12]:539.23

Language: English

Abstract.

The molecular structure of coal is estimated by 13 parameters of infrared spectra, electron paramagnetic resonance, volatile yield and ash content. A new criterion of hydrophobicity is applied, which has shown its informativeness in analyzing the molecular structure of coals of various ranks. It is more sensitive to changes in coal rank than the standard index of volatile yield. The coalification process leads to a significant increase in this index due to hydroxyl-containing compounds from the substance of coal. Two-way analysis of variance showed that the influence of the metamorphism factor is significant for 9 molecular parameters. The research of Donbas coal samples confirmed the general tendency of the influence of the metamorphism factors on the reduction of molecular diversity of oxygen-containing compounds and the shortening of aliphatic chains under the simultaneous increase in the number of paramagnetic centers and conjugated aromatic carbon structures. The factor analysis by the method of the main components of the molecular structure parameters in coal showed that the most significant independent component is metamorphism, which is a combination of temperature gradients, pressures and various tectonic influences. The remaining subordinate components can be attributed to the conditions of sedimentation, which include independent processes: accumulation of mineral components, decomposition of biomass and geochemical environment in the sedimentation period. The beds of sub-bituminous coals of early-, middle- and late carboniferous age occurring at shallow depths have insignificant differences in the molecular structure, at the same time, a deep immersion of bituminous coals leads to strong changes in their molecular structure. The introduced hydrophobicity criterion showed its informativeness in the analysis of the molecular structure of coals. It is more sensitive to changes in the coal rank than the standard index of volatile yield. The coalification process leads to a significant increase in this index due to the water release and other hydroxyl-containing compounds from the substance of coal.

Keywords:Donbas coals, molecular structure, Fourier-transform infrared spectroscopy, electron paramagnetic resonance, coalification factors.

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About the authors

Pymonenko Liudmyla Ivanivna, Doctor of Geology Sciences (D.Sc.), Senior Researcher, Principal Researcher in the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Burchak Oleksandr Vasylovych, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Senior Researcher of the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

BalalaievOleksandr Kostiantynovych, Candidat of Beology Sciences (Ph.D.), Senior Researcher, Senior Researcher Department of Geology of Coal Beds at Great Depths,Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine,, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Slobodiannykova Valentyna Kuzmivna, Master of Science, Principal Engineer of the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Serikov Yurii Anatoliiovych,Master of Science, Principal Engineer of the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Lead engineer Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

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