Multi-component gas mixture transport through porous structure of coal

Wojtacha‐Rychter, Karolina; Smoliński, Adam

doi:10.1016/j.fuel.2018.06.040

Cited by 27 publications

(17 citation statements)

References 30 publications

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“…The coal samples were analyzed in terms of their proximate, ultimate and petrographic Materials 2020, 13, 848 4 of 16 parameters according to relevant standards in an accredited laboratory of the Department of Solid Fuel Quality Assessment at the Central Mining Institute and the results in the analytical state are given in Table 1. Detailed information concerning the analyzers and standards has been reported elsewhere [11,28]. Sample nos.…”

Section: Sample Characterizationmentioning

confidence: 99%

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Wojtacha‐Rychter

Smoliński

2020

Materials

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The self-heating phenomenon of coal leads to work safety hazards in underground mining. The quantitative analysis of gaseous products in mine atmosphere constitutes one of the detection methods of advanced coal heating. The article presents the results of tests on CO, CO 2 , and H 2 emissions during simulated heating of coal in the temperature range of 323-523 K. The oxidation of 15 Polish coals of various carbon contents was performed using a flow reactor technique. A chromatography method was applied to measure the changes of oxidation products concentrations with the increase of temperature. It has been determined that all the tested gases were generated at the initial temperature. The collected data indicated that CO 2 was a major oxidation product in the entire temperature range, while the amounts of H 2 produced did not exceed 0.49% volume. At the temperature of 323 K, the ratio of CO 2 /CO was in the range of 10-23 but along with the temperature increase the ratio range narrowed to 3-4. In this paper, a comparison of the physical-chemical properties of the tested coals and the emissions profile of the gases using, among others, the hierarchical clustering analysis showed that samples with higher oxygen, sulfur, and inertinite content as well as lower ash and carbon content formed larger amounts of fire gases.

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Section: Sample Characterizationmentioning

confidence: 99%

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Wojtacha‐Rychter

Smoliński

2020

Materials

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“…Coal samples obtained from the Upper Silesia Coal Basin, Poland, according to the Polish National Standard: PNG‐04502:2014‐1 were crushed, ground, and sieved into three different fractions with sizes at the range of 0.25 to 0.50, 0.70 to 1.00, and 1.00 to 2.00 mm. The reason for choosing the above particle sizes for the coal samples examined in the sorption experiment is that according to the field literature, the sorption tests have been previously performed only for coal of grain size from 0.5 to 0.7 mm. The characteristic of the samples tested is presented in Table .…”

Section: Experimental Facilitymentioning

confidence: 99%

“…The concentration of these gases in mine air increases with the coal temperature . On the basis of the contents of these gases in mine air, gas indices are calculated, which have some limitations in terms of fire hazard assessment since these gaseous products released from the self‐heating source may be sorbed on coal . The molecules are sorbed only in certain places called polar active centers on the surface of coal particles.…”

Section: Introductionmentioning

confidence: 99%

“…Yet most of these measurements were performed with the use of carbon dioxide and methane in respect to enhanced coalbed methane recovery or with the use of single gases, eg, propylene and acetylene as an adsorbate . In turn, studies on the sorption of the mixture of ethylene, propylene, propane, and ethane have been previously performed but only on coals with the grain size of 0.5 to 0.7 mm. In the course of the experimental works, it was observed that propylene was the gas that sorbed in the larger amount and gained the sorption equilibrium in the longest time in comparison with ethane, ethylene, and propane.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 On the basis of the contents of these gases in mine air, gas indices are calculated, which have some limitations in terms of fire hazard assessment since these gaseous products released from the self-heating source may be sorbed on coal. [10][11][12][13] The molecules are sorbed only in certain places called polar active centers on the surface of coal particles. So the size and availability of the surface area have a great influence on the amount of sorbed gases.…”

Section: Introductionmentioning

confidence: 99%

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The effect of coal grain size on the sorption of hydrocarbons from gas mixtures

2019

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Summary The flow of gas mixtures through coal, accompanied by sorption, is one of the natural processes occurring in the spontaneous heating of coal in underground mines. So far, studies on the sorption of mine gases have been mostly performed with regard to single components. In turn, sorption measurements with the use of gaseous mixtures were performed only on coals with grain size at the narrow range of 0.5 to 0.7 mm. In this paper, a dynamic sorption of a mixture of propylene, ethylene, propane, and ethane in a fixed‐bed column was investigated. Coal samples of various grain classes, ie, 0.25 to 0.50, 0.7 to 1.00, and 1.00 to 2.00 mm, were used as an adsorbent. The sorption tests were conducted at a constant gas flow rate of 2.17·10−7 m3/s and the pressure of approximately 1 atm. Next, the results of the sorption tests were compared with parameters characterizing the porous structure of the materials used. The total amount of sorbed gases decreases as the grain size becomes larger. The samples characterized by a lower carbon content (<70% w/w), a slightly higher oxygen content, and a larger surface area dominated by micropores at the range of 0.6 to 2.0 nm and mesopores with diameter of 2.0 to 10.0 nm had a higher sorption capacity than samples with the structure determined mainly by mesopores. It has been noticed that a high sorption ability of ethane results from its highest concentration in the mixture at the inlet of the sorption column. In most cases, propylene was sorbed in larger amount than ethylene, independently of grain size of coal and pore size distribution.

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Selective adsorption of ethane, ethylene, propane, and propylene in flammable gas mixtures on different coal samples and implications for fire hazard assessments

Wojtacha‐Rychter

Smoliński

2019

International Journal of Coal Geology

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Multi-component gas mixture transport through porous structure of coal

Cited by 27 publications

References 30 publications

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

The effect of coal grain size on the sorption of hydrocarbons from gas mixtures

Selective adsorption of ethane, ethylene, propane, and propylene in flammable gas mixtures on different coal samples and implications for fire hazard assessments

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