Analysis of mine’s air leakage based on pressure gradient matrix between nodes

Zhang, Jian-rang; Wang, Honggang; Feng-liang, WU; Xin-tan, Chang

doi:10.1007/s12404-008-0096-z

Cited by 3 publications

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“…It was assumed that there was no temperature difference in the goaf. The width of the oxidation zone can be expressed as follows [13]: The relationship between the air supply and the width of the oxidation zone is shown in Fig. 8.…”

Section: Relationship Between Air Supply To Working Face and Width Of Oxidation Zonementioning

confidence: 99%

“…The main air leakage occurred in the range of 0-10 m along the slope of the working surface. The concept of pressure gradient matrix and related calculation methods to analyze potential air-leakage paths was proposed [13]. Electron spin resonance spectroscopy was used to measure directly the changing laws of different types and particle sizes of coal, and it was proposed that the fracture process was the key factor to generate and initiate free radical reactions [14].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Relationship Between Air Supply To Working Face and Width Of Oxidation Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%