Bezruchko K.A., Pymonenko L.I., Burchak О.V., Baranovskyi V.I., Chelkan V.V. Impact of sedimentation conditions on the coal structure and properties

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, № 160

Geoteh. meh. 2022, 160, 51-58

https://doi.org/10.15407/geotm2022.160.051

 

IMPACT OF SEDIMENTATION CONDITIONS ON THE COAL STRUCTURE AND PROPERTIES

¹Bezruchko K.A.,¹Pymonenko L.I.,¹Burchak О.V., ¹Baranovskyi V.I.,¹Chelkan V.V.

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

UDC 552.12.08

Language: English

Abstract. The creation of modern methods in the complex development of coal and gas deposits is associated with the necessity to substantiate the processes that occur in fossil organics at the atomic-molecular level under the impact of natural factors, in particular for evaluating the sorption properties of coal. Actually, natural factors determine coalification processes, including methane emission from coal as well as sorption interaction between solid and gaseous hydrocarbons. Therefore, in order to study these processes, insight into the relationship between the macro properties of coal fields and features of the molecular structure of coal matter is of great importance. At present there is a large number of theoretical and experimental studies on the research of the structure and state of coal by means of various physical, physicochemical, and chemical methods. It was proved that temperature and pressure have the greatest impact on the transformation of coal matter, but there is still a number of issues that require development or revision.
The purpose of the paper is to determine the impact of sedimentation conditions of coal-bearing deposits of the Donetsk basin on the coal structure and properties.
The study of changes in the molecular structure of coal at the nano-scale is carried out by the electron paramagnetic resonance method (EPR). The concentration of paramagnetic centers (PMC, Na) is determined, i.e. the number of unpaired electrons (free radicals), the conjugation coefficient (К_sc), which describes the fraction of conjugated systems in the molecular structure of the coal matter and also makes it possible to evaluate the structuring degree for fossil organics at the molecular level. In order to simplify data processing and its assessing as well as reducing the variability of impacts in the research of sedimentation conditions on the structure and properties of coal, the study involved the coal of the same age (suite C₂⁶) and grade (F – fiery, M – medium volatile coal). It is established that the continuous deformation of tectonic blocks over a long period of time leads to successive compaction (loosening) of a heterogeneous massif, number of defects increasing as well as changes of structural parameters and activation of coal matter. It is proved that the increased reactivity of coal causes the possibility of structural transformations at the atomic and molecular level, in particular, end-groups detachment along with formation of hydrocarbon gases, which leads to conjugation coefficient increasing for fossil organics (which, as a result, leads to the coal sorption capacity increasing).. Periodic temperature increasing of sedimentary deposits, which is associated with magmatic processes, has increased the number of paramagnetic centers and made steady their concentration in the coal matter. It is noted that the use of a thermodynamic approach and concepts of mechanochemistry to study the conditions for the coal fields formation allows researching the relationship between the properties of coal matter at the macro- and nano-scale.
Keywords: coal, geological factors, sedimentation conditions, EPR spectroscopy, molecular structure.

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About authors:

Bezruchko Kostiantyn Andriiovych, Doctor of Geology Science (D.Sc.), Senior Researcher, Head of 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, This email address is being protected from spambots. You need JavaScript enabled to view it.

Pymonenko Liudmyla Ivanivna, Doctor of Geology Science (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 (IGTM NAS 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 Science (D.Sc.), Senior Researcher, Senior Research Fellow 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 (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Baranovskyi Volodymyr Ihnatovych, Engineer, Junior 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 (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Chelkan Vira Volodymyrivna, Engineer of the Department of Patent-licensed Work and Information, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine

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