CO emission in the air return corner of the working face in shallow burial mining areas

Qin, Botao; Lü, Yi; Jia, Yuwei

doi:10.1016/j.ijmst.2014.03.026

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…Therefore, the variation and migration of gas in the gob are greatly affected by the change of surface pressure and show different laws with the change of day and night and season. The change of pressure difference between the gob and working face will affect the airflow direction, thus affecting the distribution of gas concentration at return air corner 16–18 . When the dynamic balance between the pressure in the gob and working face is broken due to the change of surface pressure caused by the alternation of day and night or season, the low oxygen gas in the gob will flow out to the working face (or the gas in the working face will flow to the gob and surface through the interface) under the effect of pressure difference, causing abnormal gas concentration at the return air corner, and affecting the normal mining activity process 19,20 …”

Section: Introductionmentioning

confidence: 99%

“…The change of pressure difference between the gob and working face will affect the airflow direction, thus affecting the distribution of gas concentration at return air corner. [16][17][18] When the dynamic balance between the pressure in the gob and working face is broken due to the change of surface pressure caused by the alternation of day and night or season, the low oxygen gas in the gob will flow out to the working face (or the gas in the working face will flow to the gob and surface through the interface) under the effect of pressure difference, causing abnormal gas concentration at the return air corner, and affecting the normal mining activity process. 19,20 For the problems of abnormal gas concentration at the return air corner caused by the change of airflow direction due to the pressure difference, a method of increasing the resistance of the return airway is generally adopted to reduce the gas emission from the gob on site.…”

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Effect of delay time of working face pressure change on airflow direction in gob: A simulation study

Wang,

Sun

2024

Greenhouse Gases

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For shallow buried mines, the cracks generated due to the mining activities will connect the surface ground and the working face through the gob, which may result in the gas exchange between the surface and underground. In this study, we proposed the gob gas flow model and verified its applicability based on the measured data on site in our previous research and discussed the effect of delay time of pressure variation between working face and surface ground on the airflow direction according to the simulation. The results suggest that the delay time of pressure variation is the main factor affecting the pressure difference between surface and working face and airflow direction. Due to the characteristics of the surface pressure changes, the effect of delay time on airflow in gob is small in a short time, but this effect gradually increases with time. According to the airflow law in a cycle of pressure variation, the airflow direction in the gob is predictable when the delay time reaches a certain value, which can be interpreted clearly on the surface pressure variation diagram. This research may provide references for the measures taken against mine disasters caused by different airflow directions. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Effect of delay time of working face pressure change on airflow direction in gob: A simulation study

Wang,

Sun

2024

Greenhouse Gases

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Quantitative characterisation of the influence of different environmental factors on coal spontaneous combustion

Zhao,

Wang,

Song

et al. 2024

J Therm Anal Calorim

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Novel approach for extinguishing large-scale coal fires using gas–liquid foams in open pit mines

Wang

Qin

et al. 2015

Environ Sci Pollut Res

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Coal fires are a serious threat to the workers' security and safe production in open pit mines. The coal fire source is hidden and innumerable, and the large-area cavity is prevalent in the coal seam after the coal burned, causing the conventional extinguishment technology difficult to work. Foams are considered as an efficient means of fire extinguishment in these large-scale workplaces. A noble foam preparation method is introduced, and an original design of cavitation jet device is proposed to add foaming agent stably. The jet cavitation occurs when the water flow rate and pressure ratio reach specified values. Through self-building foaming system, the high performance foams are produced and then infused into the blast drilling holes at a large flow. Without complicated operation, this system is found to be very suitable for extinguishing large-scale coal fires. Field application shows that foam generation adopting the proposed key technology makes a good fire extinguishment effect. The temperature reduction using foams is 6-7 times higher than water, and CO concentration is reduced from 9.43 to 0.092‰ in the drilling hole. The coal fires are controlled successfully in open pit mines, ensuring the normal production as well as the security of personnel and equipment.

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CO emission in the air return corner of the working face in shallow burial mining areas

Cited by 11 publications

References 17 publications

Effect of delay time of working face pressure change on airflow direction in gob: A simulation study

Effect of delay time of working face pressure change on airflow direction in gob: A simulation study

Quantitative characterisation of the influence of different environmental factors on coal spontaneous combustion

Novel approach for extinguishing large-scale coal fires using gas–liquid foams in open pit mines

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