Effect of longwall face advance rate on spontaneous heating process in the gob area – CFD modelling

Taraba, Boleslav; Michalec, Zdeněk

doi:10.1016/j.fuel.2011.03.033

Cited by 137 publications

(46 citation statements)

References 24 publications

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“…critical temperature (~80-130°C) if oxygen availability is sustainable and heat produced is not sufficiently dissipated by convection or conduction (Kuenzer et al, 2007b;Taraba and Michalec, 2011). Spontaneous combustion of coal is influenced by a variety of factors (Song et al, 2014a;Wu and Liu, 2011) such as coal rank (Beamish, 2005;Wang et al, 2003;Wu and Liu, 2011), moisture content (Küçük et al, 2003;Smith and Glasser, 2005;Tahmasebi et al, 2014;Wang et al, 2003), sulfur content (Huggins and Huffman, 1989;Wang et al, 2003), volatile content (Smith and Glasser, 2005), ash content (Beamish and Blazak, 2005), particle size (Küçük et al, 2003;Wang et al, 2003), porosity (Akgun and Essenhigh, 2001;Krishnaswamy et al, 1996;Zhu et al, 2013), and volume-to-surface ratio (Lohrer et al, 2005).…”

mentioning

confidence: 99%

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Song

Kuenzer

Zhu

et al. 2015

International Journal of Coal Geology

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mentioning

confidence: 99%

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Song

Kuenzer

Zhu

et al. 2015

International Journal of Coal Geology

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“…Taraba and Michalec used commercial CFD software, Fluent, to study the oxidation process of residual coal in gob. The adopted model of permeability in gob was mainly based on "O"-type caving and compaction theory, that is, permeability and porosity were largest at the back of the working face and the boundary of the gob, whereas permeability was smallest in the central part of the gob [16]. Zhu and Liu established a permeability and porosity distribution model and qualitatively analyzed the influence of gas extraction by high drainage roadway on the easily spontaneous combustible region in gob [17].…”

Section: State Of the Artmentioning

confidence: 99%

Numerical Analysis of the Influence of Ventilation at Working Face on Air Leakage in Gob

Tang¹,

Guanlin²,

Qin³

et al. 2018

JESTR

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Air leakage is a key factor that leads to spontaneous combustion of residual coal in gob, and the ventilation at the working face is the direct reason for air leakage from the working face to the gob. A model of the resistance coefficient of air leakage was established based on "O"-type caving and compaction and nonlinear seepage theories to study the influence of ventilation at working face on air leakage from the working face to the gob. Computational fluid dynamics (CFD) software, Fluent, was used to simulate the flow field of the air leakage at the experimental working face with a high drainage roadway. The air volumes obtained by simulation were consistent with the field-measured data at the experimental working face. On the basis of the simulation, the influences of wind resistance and air volume at the working face on air leakage were studied. Results show that reducing the wind resistance at the working face plays a positive role in controlling the air leakage volume from the working face to the gob. When the wind resistance at the working face reduces by 50%, the air leakage volume reduces by 28%. Meanwhile, the effects of air volumes at the working face on air leakage volume are different. A critical value of air volume at the working face is determined (24.27m³/s). Only when the air volume at the working face is more than the critical value can the air leakage volume from the working face to the gob be effectively decreased by reducing the air volume at the working face. This study provides guidance for the prevention and control of air leakage in gob.

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“…During the period of gas transfer from the underground to the ground, pipeline leakage or pipeline clogging often occurs due to the great length of the pipeline and the existence of a middle connector. It will lead to erroneous analysis results if troubleshooting cannot be detected in time [5][6][7][8][9]. Monitoring system puts the analysis unit in the chamber underground close to the sampling point.…”

Section: Features Of New Integrated Monitoring and Control System Formentioning

confidence: 99%

New integrated monitoring and control system for disaster gas application in coal mine

Zhao

Lai

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. This paper introduces the composition, working principle and characteristics of the new gas monitoring system, which are used to monitor the gas in the gob area and working face of the mine in real time. According to the oxygen concentration，the spontaneous combustion of gob area "three zones" was determined and divided. In order to carry out disaster early warning, the methane and carbon monoxide super gas concentration changes were studied and analyzed. And the variation law of gas concentration in gob area and coal face in coal mining was obtained. This study provides reference for the follow-up fire prevention and production.

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Effect of longwall face advance rate on spontaneous heating process in the gob area – CFD modelling

Cited by 137 publications

References 24 publications

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Numerical Analysis of the Influence of Ventilation at Working Face on Air Leakage in Gob

New integrated monitoring and control system for disaster gas application in coal mine

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