Investigation of mass transfer of hard coal during its transportation to the place of temporary storage

It is shown that the residual content of methane gas in coal segments is determined, on the one hand, by the initial value of methane content in the seam being mined, and on the other hand, by the conditions of coal transportation to the place of temporary storage. It is noted that the dynamics of coal methane content during its transportation to temporary storage depots depends on the intensity of mass transfer processes between coal and air. This paper describes the thermogravimetric method of establishing the parameters of mass transfer in fossil coals, which is based on the study of methane desorption from the porous structure of hard coal under laboratory conditions. It is shown that this method is expected to register the change in the mass of the sample under conditions of programmed change in the temperature of the medium in the given parameters. MOC-120H thermogravimetry setup is described, which consists of continuous weighing devices (thermo-weighers-moisture meters); a furnace in which the sample is placed; infrared sensors registering the temperature (thermocouples); a program temperature controller. The study was carried out for 5 samples. The obtained measurement results are presented in the form of time dependences of mass transfer coefficients (effective diffusion coefficient and activation energy) on the ambient temperature in the range from 30 °C to 70 °C.

Gendler S. G., Vasilenko T. A., Stepantsova A. Yu. Investigation of mass transfer of hard coal during its transportation to the place of temporary storage. MIAB. Mining Inf. Anal. Bull. 2023;(9-1):135-148. [In Russ]. DOI: 10.25018/0236_1493_2023_91_0_135.

S.G. Gendler¹, Dr. Sci. (Eng.), Professor, e-mail: Sgendler@mail.ru, ORCID ID: 0000-0002-7721-7246,
T.A. Vasilenko¹, Dr. Sci. (Eng.), Chief Researcher, e-mail: tvasilenko@mail.ru, ORCID ID: 0000-0003-4290-1520,
A.Yu. Stepantsova¹, Graduate Student, e-mail: s215060@stud.spmi.ru, ORCID ID: 0000-0002-5027-4742,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

A.Yu. Stepantsova, e-mail: s215060@stud.spmi.ru.

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