Numerical analysis on the influence of gas extraction on air leakage in the gob

Tang, Mengqi; Jiang, Bingyou; Zhang, Ruiqing; Yin, Zhiqiang; Griffiths, D. Ll.

doi:10.1016/j.jngse.2016.05.006

Cited by 55 publications

(23 citation statements)

References 22 publications

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“…where a is the limiting adsorption amount per unit mass that is combustible at the referenced pressure (m 3 is the combustible mass per unit volume (kg/m 3 ); A is the ash content of coal (%); M is the moisture content of coal (%); p n is the reference pressure, equal to 101,325 Pa; 1 p is the adsorptive equilibrium pressure of the pore system; R is the methane constant (J/(kg•K)); and T is the temperature of the coal seam (K).…”

Section: Computation Of Coupling Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

Tang

Zheng

et al. 2019

Teh. vjesn.

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Methane drainage using boreholes is one of the most effective means of preventing coal mine methane disasters. However, the distributions of stress and permeability around the borehole and the effective influence radius of methane drainage are not clearly known. To solve this problem, a mathematical model of gas-solid coupling of coal rock was first established in this study based on the Kozeny-Carman equation. In this model, the coal rock was considered as a fracture-porosity dual medium. Methane's flow was seepage in the fracture system and diffused in the pore system. Second, the finite volume method was used to discretize the coupling model. The Newton-Raphson iteration and generalized minimal residual algorithm method were used to solve the nonlinear coupling equation after diffusion. Finally, Fortran language was used to simulate the process of methane drainage using a borehole. Results showed that there was respectively stress concentration on the left and right sides of the borehole. This area was associated with the lower permeability in these zones and destroyed the borehole, which is the one of the main reasons for the low efficiency of methane drainage. The relationship between the effective influence radius and the drainage time could be described by a power function. The effective influence radius of the borehole, cumulative methane drainage volume, and residual methane content distribution obtained by simulation were well consistent with the data obtained by the actual measurements, which proves the credibility of the gas-solid coupling and solving methods. This study provides some theoretical reference for methane drainage and the solution of multi-physics field coupling model in coal mines.

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Section: Computation Of Coupling Parametersmentioning

confidence: 99%

“…Coal mine methane (CMM) is a clean and highly efficient fuel. However, it can cause serious disasters, which can threaten the safety of mine production [1][2][3][4][5]. Thus, methane control is significant for coal mining.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

Tang

Zheng

et al. 2019

Teh. vjesn.

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“…The results showed that the gas drainage by high drainage roadway affected not only the air leakage volume but also the range of air leakage. The critical gas drainage volume was obtained on the basis of the relationship between gas drainage and air leakage [22]. Zhuo et al studied the mining cracks and air leakage caused by repeated mining of shallow coal seams at Bulianta Coal Mine, Shendong Coalfield, China.…”

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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“…One of the most important problems occurring during ventilation of longwall headings in hard coal mining is an air migration of air through the goaf with caving of these headings [1][2][3]. Part of air stream supplied to the longwall is separate into two streamsone flows into the longwall, second goes to the gob ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence of Types of Rocks Forming the Goaf with Caving on the Physical Parameters of Air Stream Flowing Through These Gob and Adjacent Headings

Brodny¹,

Tutak²,

Anderson³

2018

mech

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Numerical analysis on the influence of gas extraction on air leakage in the gob

Cited by 55 publications

References 22 publications

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

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

Analysis of Influence of Types of Rocks Forming the Goaf with Caving on the Physical Parameters of Air Stream Flowing Through These Gob and Adjacent Headings

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