The interaction between coal and multi-component gas mixtures in the process of coal heating at various temperatures: An experimental study

Wojtacha‐Rychter, Karolina; Smoliński, Adam

doi:10.1016/j.fuel.2017.10.115

Cited by 32 publications

(22 citation statements)

References 22 publications

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“…Long‐term research in the field of monitoring the threat of endogenous fires has shown that the composition of emitted gases is a characteristic of a given phase of coal heating . 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 .…”

Section: Introductionmentioning

confidence: 99%

“…Though, as a result of many years of experience in fire hazard monitoring in hard coal mines, it has been established that good reproducibility of the temperature mapping is obtained for indicators based on the concentration of unsaturated hydrocarbons . Likewise, it was observed that with the development of fire hazard, the concentration of saturated hydrocarbons can increase too . However, with the increase of coal temperature, the concentration of saturated hydrocarbons displays an irregular trend.…”

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%

“…5 The concentration of these gases in mine air increases with the coal temperature. 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.…”

Section: Introductionmentioning

confidence: 99%

“…19 Likewise, it was observed that with the development of fire hazard, the concentration of saturated hydrocarbons can increase too. 8,9 However, with the increase of coal temperature, the concentration of saturated hydrocarbons displays an irregular trend. Thus, the concentration of hydrocarbons, particularly the unsaturated ones, also constitutes an additional indicator for the assessment of fire risk development in underground coal mining, in particular, when the high concentration of carbon monoxide is not caused by the coal self-heating process.…”

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%