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Revisiting possibility to cross disjunctive geological faults by underground gasifier

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Category: Mining

Last Updated on 05 November 2015

Published on 05 November 2015

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Authors:

V.H. Lozynskyi, State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Underground Mining Department, Dnipropetrovsk, Ukraine.

R.O. Dychkovskyi, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Department of Development & Research, Professor of the Underground Mining Department, Dnipropetrovsk, Ukraine.

V.S. Falshtynskyi, Cand. Sci. (Tech.), Assoc. Professor, State Higher Educational Institution “National Mining University”, Senior Lecturer of the Underground Mining Department, Dnipropetrovsk, Ukraine.

P.B. Saik, State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Underground Mining Department, Dnipropetrovsk, Ukraine.

Abstract:

Purpose. To justify the opportunities to cross the disjunctive geological faults without full coal seam fracturing by underground gasifier, basing on the established time dependencies of underground gasifier output to an effective gasification regime applying the technology of borehole underground coal gasification.

Methodology. The changing dependency of time when the underground gasifier reaches the regime of stabilization during underground coal gasification was found with a laboratory experimental unit.

Findings. The dependencies of fault plane amplitude in geological fault on the distance at which the gasifier reaches the regime of stabilization on the total output of combustible gases and their heating value were received. The change of the dependency of the coefficient of gasification enhancement, which is influenced by the thermochemical rate processes in reaction channel of the underground gasifier, is presented. The approach to transfer the results of the experimental investigation in natural conditions based on geometric and time simplifications was offered. The results of the research will allow adjusting the calculation of material and heat balance of the gasification process to determine the optimal qualitative and quantitative composition of injected air.

Originality. The time of underground gasifier reaching the regime of stabilization is determined by the rate of non-fracturing of a coal seam and regulated by the reaction channel advance and balanced supply of reagents blast.

Practical value. The results of the experimental investigations are precise enough for practical application. They can be used to determine the output parameters allowing the process to reach the regime of stabilization during underground coal gasification. It gives the possibility to expand the use of underground coal gasification technology in geological fracturing zone and can be potentially involved in mine development of substandard coal reserves for energy and chemical generator gas production, chemicals and heat manufacture.

References:

1. Bhutto, A.W., Bazmi, A.A. and Zahedi, G. (2013), “Underground coal gasification: from fundamentals to application”, Progress in Energy and Combustion Science 2013, vol. 39, no. 1, pp. 189–214.

2. Falshtynsky, V. Dychkovsky, R. and Lozynskyy, V. (2013), “Justification of the gasification channel length in underground gas generator”, Annual Scientific-Technical Colletion - Mining of Mineral Deposits 2013, CRC Press/Balkema, The Netherlands, pp. 125 – 132.

3. Daggupati, S., Mandapati, R.N. and Mahajani, S.M. (2010), “Laboratory studies on combustion cavity growth in lignite coal blocks in the context of underground coal gasification”, Energy, no. 6, pp. 2374–2386.

4. Yang, L., Zhang, X. and Liu, S. (2008), “Field test of large-scale hydrogen manufacturing from underground coal gasification (UCG)”, International Journal of Hydrogen Energy, no.4, pp. 1275–1285.

5. Perkins, G. and Sahajwalla, V. (2006), “A numerical study of the effects of operating conditions and coal properties on cavity growth in underground coal gasification”, Energy & Fuels, no. 2, pp. 596–608.

6. Yang, L. (2004), “Study on the model experiment and numerical simulation for underground coal gasification”, Fuel, no. 4, pp. 573–584.

7. Yang, L., Jie, L. and Li, Y. (2003), “Clean coal technology, study on the project experiment of underground coal gasification”, Energy, no. 14, pp. 573–584.

8. Bondarenko, V., Tabachenko, M. and Wachowicz (2010), “Possibility of production complex of sufficient gasses in Ukraine”, New Techniques and Technologies in Mining. CRC Press/Balkema, The Netherlands, pp. 113–119.

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