Experimental study on oxygen consumption rate of residual coal in goaf

Qin, Yueping; Liu, Wei; Chun, Young-Soo; Fan, Zhengzhong; Wang, Liangliang; Jia, Guowei

doi:10.1016/j.ssci.2011.08.033

Cited by 62 publications

(24 citation statements)

References 5 publications

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“…It indicates that the proportion of gas‐related accidents is gradually increasing although the total number of accidents is declining year by year. Gas‐related disasters are still considered to be the most serious disasters threatening the safety of coal mines in China . To ensure mine safety and efficient production, effective measures must be taken to control the occurrence of gas disasters.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Wang

Chang

et al. 2019

Energy Science & Engineering

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The effective extraction radius of borehole is the main parameter for determining the design and layout for coalbed methane extraction. This paper is aimed at the problem that the criteria and calculation methods for the effective extraction radius of coal seams are not comprehensive. With Wudong Coal Mine in China taken as an example, the critical gas pressure (0.441 MPa) for the calculation of effective extraction radius is first defined. Next, the gas seepage unit model around the borehole is developed, and the theoretical mathematical expression to calculate the effective extraction radius is derived. Then, the numerical simulation of gas extraction is carried out through a computational fluid dynamics program, and the effective extraction radius is obtained numerically. Furthermore, the influence of original gas pressure, borehole diameter, and negative pressure of gas extraction on gas extraction is analyzed. Finally, the results from the theoretical calculation and numerical simulation are validated by the field engineering measurement and the average relative error is small (less than 10%). The results indicate that the effective extraction radius has a linear relationship with the extraction time. Moreover, it is found that the original gas pressure is the main factor affecting the effective extraction radius and the effective extraction radius is proportional to the borehole diameter and negative pressure through analysis. Therefore, the above findings can provide a theoretical basis for determining parameters such as borehole spacing and extraction time of gas extraction in coal mines.

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Section: Introductionmentioning

confidence: 99%

“…Gasrelated disasters are still considered to be the most serious disasters threatening the safety of coal mines in China. [7][8][9][10] To ensure mine safety and efficient production, effective measures must be taken to control the occurrence of gas disasters.…”

mentioning

confidence: 99%

Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Wang

Chang

et al. 2019

Energy Science & Engineering

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“…5 In China, 56% of the state-owned collieries were jeopardized by spontaneous combustion of coal, accounting for 90 to 94% of the total mine fires. 7,8 In recent decades, it tends to rise due to the broad application of fully-mechanized caving mining that leaves behind too much residual coal in the goaf and aggravates air leakage to the goaf. 7,8 In recent decades, it tends to rise due to the broad application of fully-mechanized caving mining that leaves behind too much residual coal in the goaf and aggravates air leakage to the goaf.…”

Section: Introductionmentioning

confidence: 99%

Research on a noble extinguish material for the underground fire prevention

Han

Xue

et al. 2019

Fire and Materials

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Summary The three‐phase foam consisted of solid, liquid and gas is regarded as a highly effective measure for the underground mine fire prevention. In this study, the three‐phase foam technology is introduced and a visualization platform is established to exhibit the foam flow in a physical goaf. The diffusion rule and extinguishing performance for three‐phase foam are researched. Test results show that the three‐phase foam has a superior heat resistance than expansion foam in the top goaf. The coal heating rate is postponed after the three‐phase foam processing and the active functional groups are suppressed effectively. Increasing the foam expansion ratio is adverse to the three‐phase foam stability. The field application of three‐phase foam was evaluated via the practical extinguishment effect. The marked reduction in the sealed zone temperature and CO concentration proved that the proposed three‐phase foam technology was effective on controlling the concealed goaf fire.

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“…Statistics shows that more than 60% of coal mine fires were caused by spontaneous combustion of residual coal in gob in China [2][3]. A main reason for the spontaneous combustion of residual coal is air leakage from the working face to the gob [4][5][6][7].…”

Section: Introductionmentioning

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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Experimental study on oxygen consumption rate of residual coal in goaf

Cited by 62 publications

References 5 publications

Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Theoretical, numerical, and experimental analysis of effective extraction radius of coalbed methane boreholes by a gas seepage model based on defined criteria

Research on a noble extinguish material for the underground fire prevention

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

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