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Energies 2017, 10(5), 661; doi:10.3390/en10050661

The Repeatability of Sorption Processes Occurring in the Coal-Methane System during Multiple Measurement Series

The Strata Mechanics Research Institute of the Polish Academy of Sciences, Reymonta 27, 30-059 Cracow, Poland
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Academic Editor: Mehrdad Massoudi
Received: 8 March 2017 / Revised: 4 May 2017 / Accepted: 5 May 2017 / Published: 10 May 2017
(This article belongs to the Section Energy Sources)
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Abstract

The aim of this paper was to investigate the repeatability of sorption processes occurring in the coal-methane system during multiple measurement series. For research purposes, three granular samples of coal sorbent were used. The samples were subjected to a series of three measurements, each time performed under the same conditions. During each series of measurements, the following stages took place: outgassing the sample in a vacuum, and then saturating it with methane under the pressure of 1, 3, and 10 bar. Sorption capacities and the values of effective diffusion coefficients were compared. The studies into the repeatability of measurements of sorption capacities, conducted by means of the IGA-001 (Intelligent Gravimetric Analyzer) gravimetric instrument for three measurement cycles, showed that the obtained measurement discrepancies in relation to the mean value did not exceed 1.23%. The discrepancies in question approximated the measurement uncertainty of the IGA-001 device. The evaluation of the recurrence of determining the values of effective diffusion coefficients showed that the obtained discrepancies were no larger than 10%, which might have resulted from problems with fulfilling most of the assumptions of the applied unipore diffusion model. The authors did not observe any changes of the sorption parameters of hard coal during consecutive cycles of methane saturation. View Full-Text
Keywords: repeatability of sorption processes; sorption equilibrium; sorption capacity; coal-methane system; diffusion coefficient repeatability of sorption processes; sorption equilibrium; sorption capacity; coal-methane system; diffusion coefficient
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MDPI and ACS Style

Kudasik, M.; Skoczylas, N.; Pajdak, A. The Repeatability of Sorption Processes Occurring in the Coal-Methane System during Multiple Measurement Series. Energies 2017, 10, 661.

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