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Features of the
kinetics of methane desorption from coal to a storage vessel
V.A. Vasylkivskyi1*,
Institute for
Physics of Mining Processes the National Academy Sciences of Ukraine,
Dnipro, Ukraine
Corresponding
author: e-mail: lod.vasylkivskyi@ukr.net
Physical and
technical problems of mining production, 2020, (22), 5-18.
https://doi.org/10.37101/ftpgp22.01.001
full
text (pdf)
ABSTRACT
Purpose. To study
experimentally the effect of the volume of the tank on the accumulation of
methane, the methane system parameters in the angle and the time of
desorption recording on the kinetics of the movement of methane into the
tank.
Methods. The volumetric
method was used to study the process of desorption of methane from coal. A
new method for analyzing experimental results was
used, based on the idea of changing the characteristic relaxation time of
desorption during methane emission.
Results. The kinetics of
methane desorption into vessels of various volumes was determined. Based on
the results obtained, the effect of vascular volume on the degree of coal
degassing during desorption was revealed. A new method was
developed to determine the residual gas content in coal, which is
based on the idea of material balance. It was found that the dependence of
the characteristic parameter on the desorption
time τdes depends on the duration
of the desorption process recording. It was experimentally established that
for the same duration of desorption recording, the
“characteristic time” of methane transport from coal does not depend on the
volume of the vessel. It was found that the
sensitivity of the residual gas content to the volume of the tank decreases
with increasing volume. This is due to an increase in the solubility of the
gas in coal as the pressure in the tank decreases. Information was obtained
on the nature of the correlation between the desorption
rate and the gas content of coal.
Originality. A discussion of
the experimental results showed that for the same duration of recording
desorption, the parameter “characteristic desorption time” does not depend
on the volume of the vessel. An increase in the gas pressure in the
reservoir during desorption affects the degree of invariance of the
parameter τdes. It is
shown that a change in the invariance τdes can be expected with a change in the diffusion activation
energy. To identify it, information is needed on the progress of methane
emission over the entire desorption time interval.
Practical value.
The results of the study can be useful in diagnosing the gas content of
coal seams in mine conditions and open up prospects for predicting
gas-dynamic phenomena.
Practical
implications. The results of the study can be useful in diagnosing the gas
content of coal seams in mine conditions and open up prospects for
predicting gas-dynamic phenomena.
Keywords: volumetric
method, methane desorption, characteristic desorption time, sorption
processes, gas content, diffusion, desorption kinetics, residual gas
content, methane solubility in coal, activation energy
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