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Mathematical modeling of the gas generation process in a coal reaction chamber

  • Geological Engineering
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Journal of Mining Science Aims and scope

Conclusion

A computational mathematical model of the process of gas generation in a reaction coal chamber is developed. The model portrays the coal chamber in the form of conjoined oxygen and deoxidizing sectors.

In the oxygen sector heterogeneous reactions heat up the wall and the gas, as a result of which hot components make their appearance in the gas. The hot components burn up in homogeneous reactions, raising the temperature of the gas even higher and causing the oxygen sector to shrink (as a rule, it does not exceed 10 m in length).

In the deoxidizing zone the reaction surface increases due to fracturing of the coal as a consequence of the temperature drop casued by the endothermal reactions within the pores and microscopic fissures. These events all favor the growth of the hot components (CO, H2) in the comparatively short coal chambers (several dozen meters in length).

That the model is correct is confirmed by practical results.

It thus becomes possible, on the one hand, to diagnose individual laws governing such a complex technological process as underground coal gasification. On the other hand, based on the composition of the gas that may be practicably generated, it becomes possible to estimate the geometric and thermophysical parameters of the reaction chamber.

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References

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Authors
  1. E. V. Kreinin
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  2. E. I. Shifrin
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Additional information

Skochinskii Institute of Mining. Translated from Fiziko-Tekhnickeskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 84–90, May–June, 1995.

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Kreinin, E.V., Shifrin, E.I. Mathematical modeling of the gas generation process in a coal reaction chamber. J Min Sci 31, 230–236 (1995). https://doi.org/10.1007/BF02047674

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  • DOI: https://doi.org/10.1007/BF02047674

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