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Year 2018 Volume 16, Issue 2 |
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Issues/2018/vol. 16 /Issue 2 |
O. M. Molchanov, T. V. Pichka, O. A. Kamchatnyi, and V. V. Nevdacha
«Methane Desorption Features of Fossil Coal Nanostructured Material»
373–387 (2018)
PACS numbers: 51.20.+d, 68.43.Nr, 76.60.-k, 81.05.Rm, 81.05.U-, 83.80.Mc, 89.30.ag
The degassing processes of fossil-coal samples with different metamorphism degrees of Donetsk coalfield after saturation with methane at 15 MPa pressure are studied. The study is made using the nuclear magnetic resonance method. During saturation–degassing processes, prepared samples were placed in autodyne NMR-spectrometer receiving loop, which was integrated in a high-pressure chamber. This excludes contact of samples with atmospheric air during the experiments and atmospheric moisture influence on results. The qualitative difference between the results of methane absorption of coal in comparison with other gases is established. This is due to the closer methane relationship with the coal-samples’ substance. Diffusion and filtration components’ characteristic times for methane desorption process are determined. As found, in most cases, methane desorption process for corresponding grades of coal is longer than for other gases. This is because time of gas escape from the samples by means of the diffusion mechanism is increasing.
Keywords: coal, desorption, filtration, diffusion, porous structure, NMR
https://doi.org/10.15407/nnn.16.02.373
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