Research on mechanism of quantity discharge of firedamp from coal drift of headwork surface reflect coal and gas outburst

Zu-yun, Chen; Xiao, Zhu-Xin; Zhang, Ming

doi:10.1016/j.ijhydene.2017.06.131

Cited by 19 publications

(9 citation statements)

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“…The planning coal seam in a coal mine are hexyl group, and heptyl group, including hexyl 14 , hexyl 15 , hexyl [16][17] , and heptyl 20 four layers of coal. Hexyl 15 coal seam is located at middle and lower part of Shanxi formation, the thickness of coal seam is 0.8 ~ 5.50 m, the average thickness is 3.40 m, the average thickness is 3 ~ 3.70 m, structure is simple, it is medium thick coal seam, coefficient of variation of coal thickness 10.3% ~ 23.6%, the recoverable index was 1, is commercial seam.…”

Section: Analysis Of Coal and Gas Outburstsmentioning

confidence: 99%

“…Damage caused by gas containing coal and coal is the most common mine disaster in coal mine production [12,13]. The main reason is due to mining caused by stress concentration, the load exceeds the strength limit of coal and rock, resulting in shear damage [14][15][16]. Combined with the role of the original coal gas pressure, the coal, rock and gas to the mined-out area is a typical dynamic phenomenon, the magnitude of the explosion according to the different conditions can be different orders of magnitude [17,18].…”

Section: Introductionmentioning

confidence: 99%

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The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

Gao

Zhang

et al. 2019

Therm sci

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In view of the common mine disasters such as coal and gas outburst caused by the destruction of gas and coal, the numerical model of RFPA-GAS software was used to establish a numerical model based on a gas outburst accident took place in return roadway of working face 15-17-16041 in Pingdingshan mine. The dynamic failure mechanism of coal and gas outburst under the conditions of different support strengths protection and unsupported conditions was analyzed. Four dynamic processes of coal and gas outburst were discussed, and the dynamic failure mechanism of coal and gas outburst was revealed. The results show that the outstanding effect of the roadway without support treatment is similar to that of the field, and the coal and gas outburst is obviously weakened for supported roadway. Which has effective control of the active support for the protrusion. When the support method is designed, the response mechanism of the coupled support structure should be considered. It provides some theoretical support for the gas outburst control.

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Section: Analysis Of Coal and Gas Outburstsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

Gao

Zhang

et al. 2019

Therm sci

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“… 3 , 4 The process of coalfield fire burning not only wastes a large amount of coal resources but also produces various toxic and harmful gases that pollute the atmosphere and seriously threaten human health. 5 − 7 The interference of stress during the mining process destroys the balance of the original stress zone, and the coalfield-fire zone evolves and forms under the coupling of temperature, stress, flow, and other fields, 8 − 10 bringing greater resistance to coalfield fire prevention.…”

Section: Introductionmentioning

confidence: 99%

“…Because coal reserves are much larger than other fossil fuel reserves, coal is an important energy source to meet future power needs. , However, along with the development of coal production worldwide, especially in China, coalfield fires occur frequently. As a persistent threat to major coal-producing countries, coalfield fires are commonly distributed in exposed coalbed zones with long-burning histories. , The process of coalfield fire burning not only wastes a large amount of coal resources but also produces various toxic and harmful gases that pollute the atmosphere and seriously threaten human health. − The interference of stress during the mining process destroys the balance of the original stress zone, and the coalfield-fire zone evolves and forms under the coupling of temperature, stress, flow, and other fields, − bringing greater resistance to coalfield fire prevention.…”

Section: Introductionmentioning

confidence: 99%

Characteristics for Oxygen-Lean Combustion and Residual Thermodynamics in Coalfield-Fire Zones within Axial Pressure

Chen

et al. 2020

ACS Omega

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Coalfield fires during coal mining have become a major problem in the world today. To effectively prevent such disasters, we established an experimental platform to measure the spontaneous combustion characteristics of large-scale pressurized coal; thermal analysis experiments and microscopic analysis of briquettes under different axial pressures were carried out. It can be seen from the results that when the axial pressure is 4 MPa, the heating rate of the oxidative combustion of coal samples is accelerated, the crossing point temperature is lower (reduced by 71.09 °C), the activation energy is reduced (the second stage is decreased by 21.3 kJ/mol), and the oxidative combustion is more intense. Simultaneously, the porosity evolution process of briquettes under different axial pressures is simulated. Through calculation, it can be seen that the porosity and thermal conductivity show a linear increasing trend. The basis for the increase in the internal oxygen supply channels and increase in oxygen consumption when the axial pressure is 4 MPa is given. Through thermogravimetric–differential scanning calorimetry analysis, it is found that the maximum mass loss rate and maximum mass growth rate of residual coal after combustion under an axial pressure of 4 MPa are low, the residual rate after combustion is large, and the flammability rate is low when reoxidized, while complete combustion oxidation releases more heat. The application of axial pressure will change the combustion characteristics of briquettes, and the promotion effect is more obvious at 4 MPa. Analyzing the laws of the coal–oxygen composite reaction under different axial pressures provides theoretical guidance for the prevention and control of multistress coupling fields in coalfield-fire areas.

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“…During coal mining, mining disturbances damage the original balance of stress around the mine gob area, leading to stress redistribution in the mine shaft and around the stope, forming the "three zones" consisting of the pressure relief zone, the stress concentration zone, and the original stress zone in front of the excavation surface, which means that the coal rock in different mining phases is under different stress conditions [7,8]. In addition, dynamic disturbances such as blasting and drilling can also break the original balance of stress to change the coal stress state [1,9].…”

Section: Introductionmentioning

confidence: 99%

Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

et al. 2018

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The impact mechanism of in situ stress on outbursts plays a key role in the prevention of outbursts during deep coal mining. The in situ stress may influence the outburst by affecting the gas release intensity according to theoretical analysis, but none of the existing studies have taken into consideration this perspective. To explore whether the influence of in situ stress on gas release in coal is an important reason for stress-induced outbursts, experiments on gas release in coal under different axial stresses and on exposure-induced outbursts with different gases were conducted to respectively study the influence of in situ stress on gas release and the impact of gas release on outburst. The results show that with the increase of stress, the methane release intensity rises by 1~2.4 times and shows an obvious periodicity due to different degrees of fracture development. A small increase in gas release intensity can lead to huge increase in the outburst intensity based on an energy analysis of the outburst experiments, indicating that the gas release intensity is a sensitive physical quantity that influences outbursts. The differences in gas release in coal with different stresses will result in differences in the outburst results based on data from the two experiments, proving that the change in gas release intensity during variations of in situ stress is an important factor for in situ stress-induced outbursts. The research achievements can enrich the impact mechanism of in situ stress on outbursts.

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Research on mechanism of quantity discharge of firedamp from coal drift of headwork surface reflect coal and gas outburst

Cited by 19 publications

References 0 publications

The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

Characteristics for Oxygen-Lean Combustion and Residual Thermodynamics in Coalfield-Fire Zones within Axial Pressure

Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

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