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

Zuo, Qiting; Wang, Yujie; Li, Jingshan

doi:10.2298/tsci200609314z

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Especially, CH 4 adsorbed by residual coal will affect the chemical reaction between coal and O 2 , while the reaction between CH 4 and O 2 on the surface of high-temperature coal will accelerate the spontaneous combustion of coal and increase the risk of coal spontaneous combustion. Zuo et al [80] used a self-built experimental platform to determine the effect of different air leakage conditions on the spontaneous combustion of residual coal and obtained an exponential relationship between air supply to the working face and the spontaneous combustion of broken coal in the gob. Wang et al [81] used the particle flow numerical simulation software PFC3D to simulate the collapse of the overlying rock layer in the void area, extracted the quantitative porosity data of the void area, imported it into FLUENT software, simulated the leakage flow field in the void area, and obtained the main leakage area of the working face.…”

Section: Study On the Prevention And Control Of Fire And Explosion Risks In Gobsmentioning

confidence: 99%

Recapitulation and Prospect of Research on Flow Field in Coal Mine Gob

Zhang

Cheng

Wang

et al. 2021

Shock and Vibration

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Coal mine gob, mined-out areas in underground coal mines, often accumulates explosive methane-air mixtures that pose a deadly hazard to miners. A good understanding of the flow field in a sealed coal mine area is crucial in preventing and minimizing accidents associated with mine combustible gases and also for planning and implementing a mine rescue strategy. In recent years, the research on the flow field in the gob has changed from qualitative research in the past to quantitative research. This paper synthesizes the research results of flow field in gob in recent 40 years, covering the permeability of quarried areas, the airflow simulation in quarried areas, and the influence of ventilation parameters and geohydrological conditions on the flow field. Firstly, the overburden failure mechanism and fracture development characteristics of the mine gob, the distribution of porosity and permeability in the gob, and the relationship between them are introduced. Secondly, the development of research methods and numerical models used to study the flow field in mine gob is discussed. The distribution of the flow field in the gob under different conditions is expounded. Thirdly, the research on the prevention and control of fire and explosion risks in the gob is discussed. Finally, the problems to be solved in such research direction are addressed and suggestions are put forward.

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Section: Study On the Prevention And Control Of Fire And Explosion Risks In Gobsmentioning

confidence: 99%

Recapitulation and Prospect of Research on Flow Field in Coal Mine Gob

Zhang

Cheng

Wang

et al. 2021

Shock and Vibration

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“…Li et al (2022) studied and experimentally verified the relationship between O 2 , CO and CO 2 concentrations and temperature based on a mathematical model of the temperature field. Zuo et al (2021) studied the temperature rise during the natural oxidation of coal using a selfbuilt experimental platform and analyzed the variation of oxygen consumption and exothermic intensity with coal temperature by varying different air volumes and found that the exothermic intensity increased exponentially with the increase of temperature. Zeng et al (2018) investigated the oxidative spontaneous combustion characteristics of ultra-thick coal seams in the Junggar coalfield using temperature programmed experiments and thermogravimetric analysis, and quantitatively studied many parameters, such as O 2 consumption rate, CO and CO 2 generation rate, and coal reaction activation energy.…”

Section: Introductionmentioning

confidence: 99%

Determination and analysis of macro-featured parameters based on kilogram-level coal spontaneous combustion experiment

2023

Front. Mater.

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The quantitative characterization of coal spontaneous combustion and the accurate determination of the dangerous degree are hot and difficult in the field of coal mine safety. In the paper, the experimental test analysis of Huangling No. 2 coal was carried out by a self-designed and built kilogram-level coal spontaneous combustion experimental device, and the macro featured parameters were obtained and analyzed, such as temperature field, index gas, weight, oxygen consumption rate and exothermic intensity, and spontaneous combustion limit parameters. The results show that the experimental spontaneous combustion period of Huangling No.2 coal is 34 days. When the coal temperature was below the critical temperature of 74.59 °C, the oxidation of coal samples was relatively slow, and the oxygen consumption and the production rate of gas products did not change much. After the coal temperature exceeded the critical temperature, the oxygen consumption rate and exothermic intensity increased faster and the oxidation accelerated. After reaching the dry cracking temperature of 104.93 °C, the oxidation degree accelerated sharply. CO starts to appear at the beginning of the experiment, and the increase of CO gas concentration during the heating process is exponential and can be used as an index gas. Under the temperature condition of 40 °C, the floating coal of 0.7 m needs 25.83% oxygen concentration, and the maximum air leakage intensity of the coal is negative, and no spontaneous combustion will occur. The test data and calculation results of the experiment are important for the prediction and forecast of natural fires and the determination of the risk of spontaneous combustion on site.

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Design of gas control lane of 9# coal seam in Wuhushan Mine based on layer layout optimization

Zhang,

Qian

2024

Sci Rep

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In order to address the issue of gas over limit in the upper corner of the working face of the 9# coal seam in Wuhushan Mine, a series of theoretical and numerical simulation analyses were conducted to evaluate the optimal configuration for the gas control lane of the 9# coal seam. In accordance with the "O" circle theory and the lithology of the overlying rock strata of the 9# coal seam, the height range of the fallout zone and fissure zone in the working face mining area was determined by employing empirical formulas. The change rule and distribution characteristics of the porosity of the fissure zone and the fall zone in the mining area were analyzed based on the characteristics of rock movement and fall. The determination method was also provided. The numerical simulation software was employed to simulate and analyze the gas concentration field in the air-mining zone under conditions of no extraction and six distinct layer positions of the gas control lane. The optimal layer position of the gas control lane in the 9# coal seam was determined and subsequently implemented in the field. The results demonstrate that the overlying rock layer in the 9# coal seam exhibits a height range of 6.86 ~ 11.26 m, while the fissure zone displays a height range of 30.11 ~ 41.31 m. When the gas control road is situated in close proximity to the working face, the gas concentration field exhibits a markedly low concentration. When the distance between the gas control lane and the return airway of the working face is 20 m and the distance from the top of the coal seam is 20 m, the gas concentration in the upper corner and the return airway is 0.35% and 0.26%, respectively. These values are close to the lowest concentration observed in the layout scheme. Additionally, the gas extraction concentration and the pure volume of the gas control lane are 23.7% and 38.3 m3 min−1, respectively. These values represent the highest concentrations observed in the various layout schemes. The application of the gas management lane in the field, based on the numerical simulation results, demonstrated a successful extraction effect, which was consistent with the numerical simulation results. This effectively managed the issue of an over-limit of gas in the upper corner of the working face of the 9# coal seam.

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

Cited by 5 publications

References 13 publications

Recapitulation and Prospect of Research on Flow Field in Coal Mine Gob

Recapitulation and Prospect of Research on Flow Field in Coal Mine Gob

Determination and analysis of macro-featured parameters based on kilogram-level coal spontaneous combustion experiment

Design of gas control lane of 9# coal seam in Wuhushan Mine based on layer layout optimization

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