Combustion Kinetics and Mechanism of Pre-Oxidized Coal with Different Oxygen Concentrations

Fan, Haohao; Wang, Kai; Zhai, Xiaowei; Hu, Lihong

doi:10.1021/acsomega.1c02520

Cited by 24 publications

(3 citation statements)

References 44 publications

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“…Domestic and foreign scholars have successively designed many experimental devices for the study of the influencing factors of coal spontaneous combustion. Fan et al 1 studied the macro and micro characteristics of raw coal and oxidized coal in the combustion stage by thermogravimetric analysis and in situ Fourier transform infrared spectroscopy. The results show that preoxidation treatment can promote and inhibit the weight loss characteristics of oxidized coal.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Numerical Simulation of Coal Spontaneous Combustion in Goaf under Y-type Ventilation Mode

et al. 2022

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In the process of advancing the working face, the temperature rise and oxidation characteristics of residual coal in goaf and the prediction of index gas are of great significance to mine fire prevention and safety production. Based on the coal spontaneous combustion test, the oxygen consumption and heat release characteristics of coal spontaneous combustion were analyzed by taking coal samples at the working face and carrying out temperature-programmed experiments in the laboratory. The characteristic temperature and index gas of coal spontaneous combustion were determined as the judgment bases of “three zones” of spontaneous combustion in goaf, and the influencing factors of coal spontaneous combustion in goaf under Y-type ventilation were analyzed. Based on the test results, the changes of gas composition in goaf during the advancing of the W1310 working face were monitored. According to the actual situation of the W1310 working face in the Gaohe energy mine of Lu’an group, the multifield three-dimensional numerical simulation calculation and analysis of gas composition in goaf were carried out, and the distribution of oxygen concentration field in goaf under different air volume ratios of machine roadway and air roadway was studied. Through the analysis of the parameters of porous media in the goaf, combined with the actual situation, the user-defined function was compiled for the key parameters such as porosity, viscous resistance coefficient, and inertial resistance coefficient of porous media in the goaf. The three-dimensional seepage field, gas concentration field, oxygen concentration field, and pressure field of the gas components in goaf during the advancement of the goaf working face were simulated. The comparison of the numerical simulation results with the field-measured results shows good agreement. In order to consider safety, the numerical simulation results with a wide oxidation temperature rise zone are used for linear regression, and the regression equation is used to dynamically determine the O 2 concentration at a point away from the goaf and to determine the “three-zone” state of the point, which is of great significance to guide the progress of the working face and safe production.

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Section: Introductionmentioning

confidence: 99%

Measurement and Numerical Simulation of Coal Spontaneous Combustion in Goaf under Y-type Ventilation Mode

et al. 2022

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“…Coal spontaneous combustion is a highly compound procedure. The characteristics of coal spontaneous combustion are mainly studied from two scales: micro and macro (Wang et al 2021;Deng et al 2018;Fan et al 2021). The particle size is one of the main external factors affecting coal spontaneous combustion (Zhang et al 2019;Yi et al 2014a;Yi et al 2014b).…”

Section: Introductionmentioning

confidence: 99%

An approach for evaluation of grading forecasting index of coal spontaneous combustion by temperature-programmed analysis

Wang

Zhang

et al. 2022

Environ Sci Pollut Res

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Focused on the prediction and forecast index of coal spontaneous combustion, the temperature-programmed experiments were carried out to identify the releasing rule of the gaseous compounds with the consideration of coal particle sizes. Based on the method of growth rate analysis, critical and dry cracking temperature temperatures were determined, dividing the coal low-temperature oxidation process into three stages. The critical temperature for the spontaneous combustion of the coal is in the range of 60℃~70℃, with the dry cracking temperature ranging from 100℃ to 110℃. It was found that the particle sizes had obvious effects on the release of gaseous compounds during the coal heating test. To reduce the influence of coal particle size on the forecasting of coal spontaneous combustion, the combination methods of coefficient of variation and the weighted grey relational analysis were proposed for the selection and evaluation of coal spontaneous combustion indexes. For the tested coal sample, CO2/CO was selected as the first index, O2/(CO+CO2) and CO2/O2 as the second index.C2H4 and C2H6 were selected as the index gases to confirm that the coal oxidation reached the dry cracking temperature. This research could provide a reference for the determination of the grading forecasting index of coal spontaneous combustion.

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“…In terms of oxygen concentration, Zhong et al [6][7][8] analyzed the low-temperature oxidation kinetic properties of pre-oxidized coal at various concentrations of oxygen using TG-DSC and found that the differences in kinetic parameters at different oxygen concentrations were very small. Qi et al 9 used thermodynamic methods to analyze the oxidizing characteristics of pre-oxidized coal under a low-oxygen atmosphere in a targeted manner.…”

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confidence: 99%

Experimental study on the effect of room temperature pre-oxidized time on spontaneous combustion characteristics of coal

Zhang,

Liang,

Huang

et al. 2023

Sci Rep

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The presence of different types of coal at room temperature can lead to self-heating of coal, potentially resulting in spontaneous combustion. To investigate the effect of ambient temperature pre-oxidation (BL) time on the self-combustion characteristics of different coal types, synchronous thermal analysis (STA) and Fourier-transform infrared spectroscopy (FTIR) experiments were conducted. The results of the synchronous thermal analysis experiments indicate that ambient temperature pre-oxidation for 3 months (BL3), BL6, and BL9 coals exhibit faster oxidation reactions compared to the original coal, while BL12 coal shows slower oxidation than the original coal. Among these, BL9 coal demonstrates the most significant changes in oxidation reaction characteristics, with the fastest oxidation reaction time being 35.36 min, which is 1.38 min faster than the original coal. To support this observation, a comparison was made between the relative content of active functional groups in the original coal and BL coal. The study revealed that the BL process affects the relative content of hydroxyl groups, aromatic hydrocarbons, aliphatic hydrocarbons, and oxygen-containing functional groups, thereby influencing the coal-oxygen reaction process. This suggests that pre-oxidized coal, compared to the original coal, has a larger pore structure, which plays a dominant role in promoting coal self-combustion in the first 9 months of the BL process. As BL time continues to increase, the continuous reaction of active functional groups at room temperature leads to excessive consumption, resulting in a more significant role in inhibiting coal self-combustion. The research results provide valuable insights for predicting the spontaneous combustion risk of oxidized coal.

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Combustion Kinetics and Mechanism of Pre-Oxidized Coal with Different Oxygen Concentrations

Cited by 24 publications

References 44 publications

Measurement and Numerical Simulation of Coal Spontaneous Combustion in Goaf under Y-type Ventilation Mode

Measurement and Numerical Simulation of Coal Spontaneous Combustion in Goaf under Y-type Ventilation Mode

An approach for evaluation of grading forecasting index of coal spontaneous combustion by temperature-programmed analysis

Experimental study on the effect of room temperature pre-oxidized time on spontaneous combustion characteristics of coal

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