№71-09
To the issue of underground gasification of low-thickness unconditioned coal reserves
P. Saik1, V. Lozynskyi1, D. Malachkevych1, O. Cherniaіeva1
1Dnipro University of Technology, Dnipro, Ukraine
Coll.res.pap.nat.min.univ. 2022, 71:91-103
https://doi.org/10.33271/crpnmu/71.091
Full text (PDF)
ABSTRACT
Purpose. Formation of an innovative approach in the rational development of low-thickness unconditioned coal reserves with the establishment of their suitability for underground gasification technology and the study of mass and heat indicators of the gasification process on the example of the mine of PJSC "DTEK Pavlohradvuhillia" named after Heroiv Kosmosu.
Methods. The possibility of implementing the technology of in situ underground coal gasification was based on analytical studies. On the basis of the work developed by the professor of the Department of Mining Engineering and Education of "Dnipro University of Technology" Dychkovskyi R.O "Methods for assessing the suitability of reserves for underground coal gasification" established the general coefficient of the suitability of coal reserves for gasification located within the minefield named after Heroiv Kosmosu and are promising for future development. The output parameters of combustible and ballast generator gases, and the chemical and energy efficiency of the gasification process were studied using the "MTB SPGV" software, which passed industrial approval both during laboratory and field tests.
Findings. Current issues related to the application of a combination the technologies for the development of low-thickness non-conditional coal reserves, which allow significantly extend the life of the mining enterprise, are highlighted. In particular, after working out the productive areas of coal reserves, the orientation of production is aimed at the processing of reserves at the place of their occurrence by underground gasification technology. Criteria for the suitability of coal reserves were established, which allowed the establishment of the priority of coal seams gasification. Based on the change in the parameters of the fuel mixture, the output of combustible and ballast generator gases was investigated.
Originality. It was established that when air and oxygen-enriched blowing is supplied to the underground gas generator, the output volume of combustible generator gases remains the same, the difference lies in the concentration of these gases in the initial mixture. This is due to the high content of nitrogen during air blowing, which does not enter into a chemical reaction with coal, and at temperatures in the reaction channel below 900°C, the output of CO decreases by 25-46%.
Practical implications. The conditions of the mine named after Heroiv Kosmosu defined criteria for the suitability of coal for gasification. Two coal seams of the mine c12 and c7top are in conditions of sufficient suitability for underground coal gasification.
Keywords: underground coal gasification, eligibility criteria, coal seam, generator gas.
References
1. Osnovni napriamy rozvytku palyvno-enerhetychnoho kompleksu Ukrainy na period do 2030 roku. (2005).
https://zakon.rada.gov.ua/rada/show/v01_1558-05#Text
2. Sotskov, V. O., Podvyhina, O. O., Dereviahina, N. I., & Malashkevych, D. S. (2018). Substantiating the criteria for applying selective excavation of coal deposits in the Western Donbass. Visnyk Dnipropetrovskoho Universytetu. Heolohiia, Heohrafiia, 26(1), 158–164.
https://doi.org/10.15421/111817
3. Saik, P., Dychkovskyi, R., Lozynskyi, V., Falshtynskyi, V., Cabana, E. C., & Hrytsenko, L. (2021). Chemistry of the Gasification of Carbonaceous Raw Material. Materials Science Forum, (1045), 67-78.
https://doi.org/10.4028/www.scientific.net/msf.1045.67
4. Falshtynskyi, V., Dychkovskyi, R., Saik, P., Lozynskyi, V., Sulaiev, V., & Cabana, E. C. (2019). The Concept of Mining Enterprises Progress on the Basis of Underground Coal Gasification Method Characteristic. Solid State Phenomena, (291), 137-147.
https://doi.org/10.4028/www.scientific.net/ssp.291.137
5. Dychkovskyi, R.O. (2013). Naukovi zasady syntezu tekhnolohii vydobuvannia vuhillia u slabometamorfizovanykh porodakh: monohrafiia. NHU.
6. Tymoshenko, Ye.V. (2009). Do pytannia pidvyshchennia efektyvnosti vidpratsiuvannia tonkykh vuhilnykh plastiv. Materialy III Mizhnarodna naukovo-praktychna konferentsiia 13–19 veresnia 2009 roku «Shkola pidzemnoi rozrobky-2009», 583-588.
7. Dychkovskyi, R. O., Lozynskyi, V. H., Saik, P. B., Dubiei, Yu. V.,Cáceres Cabana, E., Shavarskyi, Ia.T (2019). Technological, lithological and economic aspects of data geometrization in coal mining. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 5, 22-28.
https://doi.org/10.29202/nvngu/2019-5/4
8. Bołoz, Ł. U. K. A. S. Z. (2018). Mining of thin coal seams using surface-underground methods. Mining–Informatics, Automation and Electrical Engineering, 56, 47-52.
http://dx.doi.org/10.7494/miag.2018.3.535.47
9. Lubosik, Z. (2013). Assessment of auger mining application in Polish hard coal deep mines. Mining of Mineral Deposits, 133-142.
10. Rosen, M. A., Reddy, B. V., & Self, S. J. (2018). Underground coal gasification (UCG) modeling and analysis. Underground Coal Gasification and Combustion, 329–362.
https://doi.org/10.1016/b978-0-08-100313-8.00011-6
11. Saik, P. B., Falshtynskyi, V. S., Lozynskyi, V. H., Cabana, E., Demydov, M., & Dychkovskyi, R. (2020). Efficiency of underground gas generator in consideration of the reverse mode. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (4), 39-46.
https://doi.org/10.33271/nvngu/2020-4/039
12. Dychkovskyi, R.O. (2013). Naukovi zasady syntezu tekhnolohii vydobuvannia vuhilnykh plastiv u slabometamorfizovanykh porodakh. (Dysertatsiia na zdobuttia naukovoho stupenia doktora tekhnichnykh nauk, 05.15.02 – pidzemna rozrobka rodovyshch korysnykh kopalyn).
13. Lozynskyi, V., Dichkovskiy, R., Saik, P., & Falshtynskyi, V. (2018). Coal Seam Gasification in Faulting Zones (Heat and Mass Balance Study). Solid State Phenomena, 277, 66–79.
https://doi.org/10.4028/www.scientific.net/ssp.277.66
14. Laciak, M. (2011). Material and energy balance of the ucg process in the laboratory conditions. SGEM2011 11th International Multidisciplinary Scientific GeoConference.
https://doi.org/10.5593/sgem2011/s18.111
15. Fischer, D D., Boysen, J.E., & Gunn, R.D. (1977). Energy balance for the second underground coal gasification experiment, Hanna, Wyoming. Trans Soc Min Eng AIME, 262(4), 341-347.
16. Sawyer, W.K., & Shuck, L.Z. (1976). Numerical simulation of mass and energy transfer in the longwall process of underground gasification of coal. Symposium on Numerical Simulation of Reservoir Performance, 355-365
17. Saik, P.B. (2015). Obgruntuvannia parametriv tekhnolohii sverdlovynnoi pidzemnoi hazyfikatsii vuhillia zi zblyzhenykh plastiv (Avtoreferat dysertatsii na zdobuttia naukovoho stupenia kandydata tekhnichnykh nauk, 05.15.02 – pidzemna rozrobka rodovyshch korysnykh kopalyn).
