THERMAL SCIENCE

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Contribution to creating a mathematical model of underground coal gasification process

ABSTRACT
Underground coal gasification (UCG), as an autothermal process, includes processes of degasification, pyrolysis, and the gasification itself. These processes occur as a result of a high temperature and the management of coal combustion during addition of gasification agent. Air, water vapor mixed with air, air or water vapor enriched with oxygen, or pure oxygen, may be used as gasification agents. Resulting gas that is extracted in this process may vary in chemical composition, so it is necessary to adjust it. That is the reason why it is necessary to develop a mathematical model of the underground gasification process prior to any operations in coal deposit, in order to obtain as much accurate prediction of the process as possible. Numerical calculation provides prediction of gas mixture's chemical composition, which enables calculation of gas components' energy contents and total energy content of the gas in predicted underground coal gasification process. It is one of the main criteria in the economic assessment of UCG process. This paper, based on available data on researches in this area, provides a contribution to creation of mathematical model of underground coal gasification.
KEYWORDS
PAPER SUBMITTED: 2018-03-16
PAPER REVISED: 2018-05-08
PAPER ACCEPTED: 2018-05-10
PUBLISHED ONLINE: 2018-05-20
DOI REFERENCE: https://doi.org/10.2298/TSCI180316155P
REFERENCES
  1. Petrović D. et. al., Possibilities of coal conversion into gas fuel from the aspect of greater valorization of available energy resources in Serbia by implementing UCG, RMZ - Materials and Geoenvironment, 57 (2010), No. 1, pp. 113-125
  2. Petrović D., Izučavanje podzemne gasifikacije uglja, kroz mogućnosti primjene kod vanbilansnih rezervi mrkih ugljeva (Study of UCG through possibility of application in out of balance coal reserves, in Serbian), PhD Thesis, RGF, Tuzla, Yugoslavia, 1988
  3. Kreйnin E. V. et. al., Podzemnaя gazifikaciя ugolъnыh plastov (Underground Coal Gasification, in Russian), NEDRA, Moscow, 1982
  4. Andrianopoulos E. et. al., Chemical process modeling of underground coal gasification and evaluation of produced gas quality for end use, Energi Procedia, 76 (2015), pp. 444-453
  5. Yang L.H., et. al, Temperature and Gas Pressure Features in the Temperature-control Blasting Underground Coal Gasification, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 32 (2010), pp. 1737-1746
  6. Venugopal D., et al.: Air and oxygen gasification simulation analysis of sawdust, Thermal science, 2018, doi.org/10.2298/TSCI170613102V
  7. Rauk J., Wibór optymalnych metod podziemnego zgazowania Węgla, GIG Katowice, Poland, 1978
  8. Self S., et. al., Review of underground coal gasification technologies and carbon capture, Int J Energy environ Eng, 3 (2012), pp. 1-8
  9. Mohtadi M., Aachener autoklavenanlage zur simulation der Untertage-kohlenvergasubg, Symposium Aachen, 1981
  10. Sharaf A., et. al., Modeling Cavity Growth during Underground Coal Gasification, Comsol Conference, Boston 2011.
  11. Janoszek T., Stańczyk K., Smoliński A. Modelling Test of Autothermal Gasification Process Using CFD, Archives of Mining Sciences 62 (2), pp. 253-268
  12. Perkins G., Sahajwalla V., A Mathematical Model for the Chemical Reaction of a Semi-infinite Block of Coal in Underground Coal Gasification, Energy&Fuels, 19 (2005), pp. 1679-1692
  13. Hatzilyberis K.S., Androutspoulos G.P.: Lignite chemical conversion in an indirect heat rotary kiln gasifier, Thermal science, 10 (2006), Issue 3, pp 181-197
  14. Palarski J., Gas and Heat transport in the Underground Coal Gasification, Symposium Saarbricken, 1986.
  15. Blinderman MS, SJ Friedman, Underground Coal Gasification with Carbon Capture and Storage: A Pathway to a Low-Cost, Low-Carbon Gas for Power Generation and Chemical Synthesess, NENTL 5th Annual Conference on Carbon Sequestration, Axchange Monitor Publications, 2006, Alexandria, VA,
  16. Jovanović, R. D., et al.: Novel fragmentation model for pulverized coal particles gasification in low temperature air thermal plasma, Thermal science, 20 (2016), Suppl. 1, pp. S207-S221
  17. Petrović D., et. al., Introduction of UCG in some parts of Aleksinac Coal Basin (in Serbian), Proceedings, Energy 2008, Zlatibor, Energy Union Belgrade, 2008