The inducement of coal spontaneous combustion disaster and control technology in a wide range of coal mine closed area

Pan, Rongkun; Fu, Dong; Xiao, Zejun; Chen, Lei

doi:10.1007/s12665-018-7540-1

Cited by 27 publications

(11 citation statements)

References 6 publications

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“…However, human entry into the goaf is particularly difficult, and both the source of the fire and the location of the hightemperature areas are well concealed. Current monitoring methods are unable to meet the requirements for the prevention of spontaneous coal combustion [4,5]; consequently, numerical simulations are used to realize the occurrence and development of this phenomenon. The relationship between the advancement of the working face and the risk distribution of the spontaneous combustion of coal within the goaf is analyzed to provide theoretical guidance for the prediction and control of the spontaneous combustion of coal within the goaf area.…”

Section: Introductionmentioning

confidence: 99%

Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed

Zuo

Wang

2021

Therm sci

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This paper examines the relationship between the advancement of the working face and the distribution of spontaneous coal combustion under a low air leakage wind speed in a goaf. Based on the unsteady state simulation method, the process of spontaneous coal combustion was simulated in a fully mechanized coal mining face at different advancing speeds. The relationship between different advancing speeds and the distribution area of the oxidation zone of spontaneous coal combustion in a goaf was clarified. A safe advancing speed was determined. Furthermore, the advancement of the working face altered the area of spontaneous high temperature inside the goaf. An increase in the advancing speed increased the length of time of spontaneous combustion in the leftover coal. An exponential relationship was demonstrated between the spontaneous combustion area and the advancement of the fully mechanized mining face. When the oxygen concentration was used as a calculation indicator, the width of the oxidation zone was asymmetrical on the inlet and outlet, and the advancing distance of the working surface increased when the distance was shorter than 90 m and the return side was smaller than the inlet side. When the advancing distance was longer than 90 m, the width of the spontaneous combustion oxidation zone distribution remained unchanged. The study clarified the relationship between the distribution of the danger area for spontaneous coal combustion and advancing speed. This could provide a theoretical basis for the prevention and control technology of the spontaneous combustion of broken coal in a dynamic goaf.

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Section: Introductionmentioning

confidence: 99%

Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed

Zuo

Wang

2021

Therm sci

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“…Fully mechanized top caving technology improves production efficiency of mines, but it increases the leakage intensity of goaf and produces excessive residual coal. The increase in the leakage intensity increases the probability of spontaneous combustion of coal in the goaf [ 4 – 7 ]. Injecting nitrogen technology in mining operations aids in preventing the spontaneous combustion of coal in the goaf and in extinguishing fires that do occur the goaf.…”

Section: Introductionmentioning

confidence: 99%

Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face

Wei

et al. 2021

PLoS ONE

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In order to effectively prevent and control spontaneous combustion of residual coal in the goaf and reduce the waste of nitrogen caused by setting the position of nitrogen injection, 1303 fully mechanized coal caving faces of the Jinniu Mine are studied. By deploying a bundle tube monitoring system in the inlet air side and return air side of the goaf, changes in gas concentration in the goaf are continuously monitored. In addition, the distribution area for spontaneous combustion three-zone in the goaf is divided into heat dissipation zone, oxidized spontaneous combustion zone, and suffocation zone. Simulations from the COMSOL Multiphysics 5.3 software provide insight based on the three zones division standard of spontaneous combustion in the goaf. The gradual deepening of the nitrogen injection position into the goaf affects the lower limit of the oxidized spontaneous combustion zone significantly, but the impact on the upper limit of the oxidized spontaneous combustion zone is not obvious and is negligible. With regard to the width of the oxidized spontaneous combustion zone, it initially decreases followed by a gradual increase. Numerical calculations suggest the optimal nitrogen injection position is 40 m from the roof cutting line, with an oxidized spontaneous combustion zone width of 28 m. Based on the simulation analysis results, nitrogen injection controlling measures have been adopted for spontaneous combustion of residual coal in the goaf of the 1303 fully mechanized coal caving faces, and coal self-ignition in the goaf has been successfully extinguished.

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“…Many previous studies have explored the spontaneous combustion of coal in the goaf. A spontaneous coal-combustion event at the Wangtaipu Coal Mine was analyzed [4] and the occurrence conditions, mechanisms, and risk of spontaneous combustion were analyzed in a closed goaf. The influence of preheating with different oxygen concentrations on the spontaneous combustion behavior of secondary coal was investigated in [5].…”

Section: Introductionmentioning

confidence: 99%

Study on the oxidation and heating characteristics of residual coal in goafs under different air-leakage conditions

Zuo

Wang

2021

Therm sci

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The spontaneous combustion of broken coal is one of the main causes for mine safety accidents in goafs. To determine the effect of different air-leakage conditions on the spontaneous combustion of leftover coal, the air-leakage passage of the goaf was designed based on the principle of Sudoku grid in an inflammable coal seam. The temperature rise during the auto-ignition oxidation of coal was studied using a self-built experimental platform. By changing the air flow rate, the laws of the change in the oxygen consumption rate and the heat-release intensity with the coal temperature were analyzed. Results show that the oxygen consumption rate had three obvious peaks at 48?C, 75?C and 105?C, respectively. Above 80?C, spontaneously combustion of the experimental coal samples began. The exothermic intensity increased exponentially with the rise of temperature. Furthermore, an exponential relationship was observed between the air supply at the working face and the spontaneous combustion of broken coal in the goaf. In addition, the increase in air supply in the fully-mechanized mining face increased the width of the oxidation zone.

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The inducement of coal spontaneous combustion disaster and control technology in a wide range of coal mine closed area

Cited by 27 publications

References 6 publications

Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed

Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed

Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face

Study on the oxidation and heating characteristics of residual coal in goafs under different air-leakage conditions

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