Study on the precursor characteristics of coal energy spontaneous combustion process using infrasound wave monitoring and warning

Liu, Jifan; Ma, Yankun; Kong, Biao; Bing, Yuxian; Yang, Tao; Zhao, Xushuai; Ma, Lu

doi:10.1016/j.energy.2024.130406

Energy

2024

DOI: 10.1016/j.energy.2024.130406

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Study on the precursor characteristics of coal energy spontaneous combustion process using infrasound wave monitoring and warning

Jifan Liu,

Yankun Ma,

Biao Kong

et al.

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2024

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Cited by 4 publications

References 31 publications

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Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction

Wang,

Yang,

Chen

et al. 2024

Energy Science & Engineering

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To study the effect of coal pressure on gas extraction under fluid‐solid coupling, the effect of gas extraction radius under different pore sizes and treatment methods was simulated by using COMSOL Multiphysics software, the time evolution law of gas pressure on coal surface was obtained, and the numerical simulation results were verified by the observation of flow rate and concentration in experimental mine combined with fluid‐solid interaction. The results show that the distance of extraction radius increases with the increase of borehole diameter, and the relation between extraction time and extraction radius is a power function, but the increase gets smaller and smaller until it becomes zero. For Φ98 mm borehole and Φ120 mm borehole, hydraulic treatment can increase the efficiency of gas extraction by 31.3% and 22.7%, respectively. For hydraulic treatment and conventional treatment, the ratio of gas drainage effect by enlarging hole size is 6.3% and 13.8% respectively. Compared with the areas without gas extraction under the four conditions, the descending speed of gas pressure from fast to slow is Φ120 mm hydraulic flushing treatment, Φ98 mm hydraulic flushing treatment, Φ120 mm conventional treatment, Φ98 mm conventional treatment. Compared with four different conditions, after 180 days of extraction the coal gas pressure decreased by 75.3% within reasonable hole spacing. At the same time, in multi‐hole pumping, the influence area of adjacent borehole is larger than that of single‐hole pumping, and the spacing of borehole should be less than twice the radius of pumping.

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Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction

Wang,

Yang,

Chen

et al. 2024

Energy Science & Engineering

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Study on sound wave kinematic characteristics and temperature sensing mechanism during the warming process of loose coals

Kong,

Zhong,

Wei

et al. 2024

Energy

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Effect of coal moisture content on gas desorption and diffusion: A theoretical model and numerical solution

Wang,

Han,

et al. 2024

Physics of Fluids

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Moisture in coal plays a critical role in influencing gas desorption. This work numerically establishes a mathematical model for the gas desorption in spherical coal particles with different moisture contents based on the free gas density gradient (FGDG) concept. Importantly, the gas desorption pressure drop starting time (DPDST) was defined, and its response mechanism to moisture content was explored. Finally, the theoretical differences between the classical Fick's and FGDG models in describing the gas desorption/diffusion of water-containing coal were discussed in particular. The results show that the final stabilized dimensionless gas pressure in coal becomes closer and closer to the external initial dimensionless pressure as the coal moisture content increases. The DPDST is inversely proportional to the moisture content of the coal sample, possibly because more gas adsorption sites are occupied by water molecules at high moisture contents. Three different well-used empirical formulas for gas desorption were used for fitting, with one of the nth power of time t empirical formulas yielding the best fit. Based on the fitting results, the gas desorption amount limit is inversely proportional, and the gas desorption rate is proportional to the moisture content of the coal sample. On the basis of the diffusion coefficient inversion results, the prediction accuracy of the FGDG model is higher than that of the Fick's model. Theoretically, the diffusion coefficients of both models are inversely proportional to the coal moisture content, possibly because water molecules may occupy the adsorption sites of gas molecules and hinder the diffusion channel.

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Study on the precursor characteristics of coal energy spontaneous combustion process using infrasound wave monitoring and warning

Cited by 4 publications

References 31 publications

Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction

Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction

Study on sound wave kinematic characteristics and temperature sensing mechanism during the warming process of loose coals

Effect of coal moisture content on gas desorption and diffusion: A theoretical model and numerical solution

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