Computational investigation on effects of geo-mining parameters on layering and dispersion of methane in underground coal mines- A case study of Moonidih Colliery

Mishra, Devi Prasad; Panigrahi, Durga Charan; Kumar, Poninder

doi:10.1016/j.jngse.2018.02.030

Cited by 40 publications

(17 citation statements)

References 13 publications

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“…Methane (CH4) is a naturally occurring gas, formed during the process of coalification [2,9,10]. In coal deposits, methane is present in two fundamental forms: as sorbed methane, which is physicochemically bound with a carbon substance, and as free methane, occurring in pores and crevices of gangues and coal.…”

Section: Introductionmentioning

confidence: 99%

“…The inflammable gas mixture, mostly CH4 (80-96%) with minor constituents of other gases, such as N2, CO2, C2H4, and C2H6 and occasionally containing CO and H2S, is called a firedamp [11,12]. Methane, being the major constituent of firedamp, is also synonymously referred to as firedamp [10].…”

Section: Introductionmentioning

confidence: 99%

“…With increase in air velocity, the layering number increases and the probability of occurrence of methane layering decreases. Hence, dispersion of methane layering more strongly depends on air velocity than the making of gas [10].…”

Section: Introductionmentioning

confidence: 99%

“…Works describing analyses of ventilation systems in mine headings have been presented in numerous publications [1,3,5,[20][21][22][23][24][25][26][27][28][29][30][31][32]. They encompassed both real-world tests [16,17,21,[24][25][26]29,31] and model-based analyses [1][2][3][4][5]10,20,23,27,28,30,[32][33][34][35][36][37]. In the authors' opinion, the works which are particularly interesting in this regard are those presenting the results of model-based tests related to the release of methane into mine headings.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Tutak

Brodny

2018

Energies

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Methane, which is commonly found in hard coal deposits, represents a considerable threat to the safety of mining operations in these deposits. The paper presents the results of tests, aiming to limit the negative impact of methane on hard coal exploitation and improve work safety. The tests encompassed an analysis of methane concentration distributions in the tailgate (in the intersection area with the longwall), with account being taken of auxiliary ventilation equipment. This equipment is responsible for reducing methane concentration levels in the intersection area between the longwall and the tailgate. The analyses presented in the article were conducted for a spatial model of a longwall area, using the Computational Fluid Dynamics (CFD) method. Account was taken of the real-world measurements of the headings as well as the measurement data concerning methane concentration and ventilation parameters. The tests took into account methane emissions from the mined coal and from the goaf with caving. The analyses were performed for the system with and without auxiliary equipment, for different velocities of the additional air stream. This made it possible to compare both systems and determine the impact of auxiliary equipment on the distribution and concentration of methane in the most vulnerable area of exploitation. The distributions of the air and gas mixture were also determined in the analysed headings and goaf with caving. The results obtained clearly demonstrate that using auxiliary equipment has a significant effect on the ventilation parameters of the air stream and leads to reduction in methane concentrations in the most vulnerable section of the longwall. These results also confirmed the advantages of auxiliary ventilation equipment, which should contribute to their wider application in underground hard coal exploitation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Tutak

Brodny

2018

Energies

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“…Horizontal wells have been used to exploit CBM reservoirs in the last twenty years [1,2]. The actual tracks of the wellbores are not completely horizontal, and the elbow section of undulating pipeline provides favorable conditions for particles aggregation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on gas-liquid-coal fines three-phase flow in undulating pipeline

Wang¹,

Wu²,

Han³

et al. 2018

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI171218162WThe aggregation of coal fines particles at the bottom of the coal-bed methane well is a common occurrence during production, which could inhibit the flow in the bottom of wells and have adverse effect on the downhole equipment. In this work, gas-liquid-solid three-phase flow experiments were carried out to investigate the migration and discharge of coal fines particles in undulating pipeline. The experiments were conducted in downbent V-shaped pipes with different inclination angles. Based on the conductivity method, the real-time liquid holdup at three positions of the elbow was measured by the developed software. The slugs were identified on the time series curves of liquid holdup, and the characteristics of each slug were calculated, such as length and translational velocity. Meanwhile, the moving of particles with different size and concentration can be observed through visualized flow channel. The dyed coal fines particles are injected into the multiphase flow loop. By observing whether they can be discharged from the V-shaped pipe, the lower limits of superficial gas and liquid velocities to avoid particle retention at the elbow were determined. A correlation to predict the critical gas and liquid velocity was presented, and the accuracy of the calculation model was verified in comparison with the experimental results.

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Assessment of relative impacts of various geo-mining factors on methane dispersion for safety in gassy underground coal mines: an artificial neural networks approach

Mishra

Panigrahi

Kumar

et al. 2020

Neural Comput & Applic

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Computational investigation on effects of geo-mining parameters on layering and dispersion of methane in underground coal mines- A case study of Moonidih Colliery

Cited by 40 publications

References 13 publications

Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Experimental study on gas-liquid-coal fines three-phase flow in undulating pipeline

Assessment of relative impacts of various geo-mining factors on methane dispersion for safety in gassy underground coal mines: an artificial neural networks approach

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