Study on the dynamic evolution law of spontaneous coal combustion in high-temperature regions

Wang, Caiping; Chen, Lijuan; Bai, Zujin; Deng, Jun; Liu, Li

doi:10.1016/j.fuel.2021.123036

Cited by 33 publications

(16 citation statements)

References 37 publications

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“…The research of Song et al improved the deficiencies of previous research on the diffusion mass transfer theory of coal oxygen reaction and perfected the multiphysics coupled model of underground coal fires. Wang et al (2022) constructed a multiphysics coupled coal spontaneous combustion model by COMSOL software and analyzed the influence rule of the different oxygen concentration, ventilation and working face advancement speed on high temperature areas, and the simulation results were confirmed experimentally.…”

Section: Numerical Simulationsmentioning

confidence: 89%

“…Su et al (2017) conducted low-temperature coal oxidation experiments in the range of oxygen concentrations from 6% to 21%, and found that oxygen concentration has little effect on the oxidation reaction at temperatures above 80 °C. Wang et al (2022) investigated the effect of oxygen concentration and ventilation on the high temperature zone and found that the air supply is proportional to the change of high temperature point in the mined-out area, while the oxygen volume fraction is a key factor in determining whether the coal would spontaneously combust. Wieckowski et al (2020) studied the concentration changes of ethane, ethylene and other gaseous products during the heating and cooling stages of coal samples under different flow rates of synthesis air and nitrogen, and found that the temperature change and airflow rate have an effect on the CO/CO 2 index of the generated gas.…”

Section: Low-temperature Oxidation Of Coalmentioning

confidence: 99%

“…Scholars have studied the influence of the advancing speed of the working face and the ventilation mode on underground coal fires during mining. Wang et al (2022) studied the effect of the advancing speed of the working face on the high temperature area, and found that the advancing speed is negatively correlated with the size of the high temperature point, and the faster the speed, the more the high temperature area shifts to the deeper part; in addition, as the working face advances, the oxygen concentration in the deeper mined-out area farther away from the working face becomes smaller.…”

Section: Low-temperature Oxidation Of Coalmentioning

confidence: 99%

See 2 more Smart Citations

Combustion mechanism and control approaches of underground coal fires: a review

Liang

Yang

Guo

et al. 2023

Int J Coal Sci Technol

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With the large-scale mining of coal resources, the huge economic losses and environmental problems caused by underground coal fires have become increasingly prominent, and the research on the status quo and response strategies of underground coal fires is of great significance to accelerate the green prevention and control of coal fires, energy conservation and emission reduction. In this paper, we summarized and sorted out the research status of underground coal fires, focused on the theoretical and technical issues such as underground coal fire combustion mechanism, multiphysics coupling effect of coal fire combustion, fire prevention and extinguishing technology for underground coal fires, and beneficial utilization technology, and described the latest research progress of the prevention and control for underground coal fire hazards. Finally, the key research problems in the field of underground coal fire hazards prevention and control were proposed in the direction of the basic theory, technology research, comprehensive management and utilization, with a view to providing ideas and solutions for the management of underground coal fires.

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Section: Numerical Simulationsmentioning

confidence: 89%

Section: Low-temperature Oxidation Of Coalmentioning

confidence: 99%

Section: Low-temperature Oxidation Of Coalmentioning

confidence: 99%

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Combustion mechanism and control approaches of underground coal fires: a review

Liang

Yang

Guo

et al. 2023

Int J Coal Sci Technol

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“…The air circulation in the goaf was insufficient, resulting in an accumulated heat that could not be discharged in time. The increase of temperature made it easier for CSC to occur in the mine. − The oxygen in the air reacted with the reactive groups in the coal, and the coal began to generate heat. , The heat generated by the low-temperature oxidation of coal cannot dissipate in time in a limited space, and the accumulated heat would further accelerate the oxidation reaction . After entering the rapid oxidation stage, the heat would make the surrounding temperature increase rapidly, and the spontaneous combustion tendency of coal would increase. , CSC produced toxic and harmful gases (such as CO, CH 4 , C 2 H 2 , C 2 H 4 , and C 2 H 6 ), which seriously endangered the life and health of workers and the ecological environment. , CSC would also cause gas and dust explosion, resulting in huge economic losses.…”

Section: Introductionmentioning

confidence: 99%

“…The increase of temperature made it easier for CSC to occur in the mine. 11 − 13 The oxygen in the air reacted with the reactive groups in the coal, and the coal began to generate heat. 14 , 15 The heat generated by the low-temperature oxidation of coal cannot dissipate in time in a limited space, and the accumulated heat would further accelerate the oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

et al. 2022

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Mine water cannot be discharged until it has been treated, which increases the cost of mining and causes environmental damage. This paper attempted to use sulfate mine water as a flame retardant material for the treatment of coal spontaneous combustion (CSC) in underground mines. The temperature-programed experimental device and gas chromatograph were used to simulate the low-temperature oxidation process of coal. Infrared spectroscopy was used to study the influence and inhibition mechanism of mine water and chloride inhibitor on active functional groups. It was found that although the sulfate mine water inhibited the formation of −OH, it accelerated the cleavage of the aromatic ring. The thermogravimetric experiment was used to analyze the ignition temperature and activation energy of different coal samples. It was found that mine water had an obvious effect on inhibiting CSC in the combustion stage, which could increase the oxidation temperature of coal.

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Dependence evaluation of factors influencing coal spontaneous ignition

Wu,

Yao,

Chen

et al. 2023

Energy Science & Engineering

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Coal spontaneous combustion is determined by a variety of factors. Testing can describe the changes incoal spontaneous combustion with various factors, however, the dependence of spontaneous combustion on various factors is unclear. Therefore, reliability theory was used to deduce the functional relationship of the dependence of coal spontaneous combustion on various factors, and construct a model algorithm for predicting the probability of occurrence of coal spontaneous combustion, which is adopted to evaluate and rank the degree of influence of various factors on coal spontaneous combustion. Effective prevention methods are proposed by strengthening the role of the most important factors. The results show that, by taking the duration of coal heating to 150°C as the measurement standard of coal spontaneous combustion, the duration of the initial stage of coal heating increases linearly with the increase of specific heat capacity, thermal conductivity, and moisture content of coal. With the increase of oxygen concentration, oxidation rate, and initial temperature of the coal, the duration of the initial stage of coal heating decreases exponentially. With the increase of gas flow seepage velocity in the coal body, the duration of the initial heating stage changes in a parabolic manner. At the same time, the probability of spontaneous combustion decreases exponentially with the increase of specific heat capacity and moisture content of the coal. The probability of coal spontaneous combustion increases linearly with the increase of coal thermal conductivity, oxygen concentration, gas seepage velocity, and rate of oxidation. The dependence of coal spontaneous combustion probability on different factors can be expressed as follows: coal temperature > gas seepage velocity > specific heat capacity > oxidation rate > oxygen concentration > moisture content > thermal conductivity.

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Study on the dynamic evolution law of spontaneous coal combustion in high-temperature regions

Cited by 33 publications

References 37 publications

Combustion mechanism and control approaches of underground coal fires: a review

Combustion mechanism and control approaches of underground coal fires: a review

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

Dependence evaluation of factors influencing coal spontaneous ignition

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