Analysis of oxidation pathways for characteristic groups in coal spontaneous combustion

Zhang, Yanni; Pan, Shu; Deng, Jun; Duan, Zhengxiao; Li, Lele; Zhang, Lulu

doi:10.1016/j.energy.2022.124211

Cited by 70 publications

(7 citation statements)

References 30 publications

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“…The "hysteresis" feature is that the increase in air supply promotes the heat loss inside the coal body, and the peak value of the coal oxidation reaction is delayed. The above results prove that heat is the main factor that dominates the reaction of coal at the initial stage of low-temperature oxidation [39]. Figure 4 gives the relationship between the peak time of the oxygen volume fraction change rate at the outlet and the flow rate.…”

Section: Influence Of Inlet Air Volume On Coal Spontaneous Combustion...mentioning

confidence: 58%

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

et al. 2023

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Coal spontaneous combustion in underground mine goaf has a great impact on coal mining. The temperature-programmed experiment is a commonly used and effective method for studying the characteristics of coal spontaneous combustion. Aiming at the problem that the numerical simulation of coal spontaneous combustion characteristics under the condition of external air supply and temperature control in a temperature-programmed experiment is insufficient, a multi-physical field coupling numerical model of coal spontaneous combustion in the temperature-programmed experiment is established. The variation characteristics of coal temperature, oxygen, and oxidation products under external air supply and temperature control were studied. The results show that the numerical simulation results are consistent with the experimental results. With the increase in temperature, the volume fractions of oxygen and carbon dioxide decrease and increase, respectively. As the air supply volume increases, the oxygen volume fraction at the outlet increases, and the peak value of the oxygen volume fraction change rate exhibits a “hysteresis” feature, and the time corresponding to the peak value increases. Moreover, the temperature change rate increases. With the increase in the heating rate, the peak value of the oxygen volume fraction change rate increases and shows an “early appearance” characteristic, at the same time, the maximum coal temperature displays a linear increase trend.

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Section: Influence Of Inlet Air Volume On Coal Spontaneous Combustion...mentioning

confidence: 58%

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

et al. 2023

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“…The spontaneous combustion tendency is closely related to the microstructure of coal. The size and pore structure of coal particles, the water content of coal and the elements contained, and the active functional groups all have an effect on the coal-oxygen complex reaction (Zhao et al 2019a(Zhao et al , 2022Zhang et al 2022;Song et al 2021). Some scholars have studied the spontaneous combustion characteristics of coal through thermodynamic experiments (Qin et al 2012;Zhao et al 2019b).…”

Section: Spontaneous Combustion Tendency Of Coalmentioning

confidence: 99%

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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“…The risk of spontaneous combustion exists in 51.3% of the state-owned key coal mines . CSC events not only destroy a large amount of coal resources but also release toxic and harmful gases, which threaten the atmospheric environment and the lives and safety of underground personnel and even lead to gas and coal dust explosion accidents. − CSC occurs as a result of heat accumulation because of the reaction of active microstructures in coal with oxygen . Adsorption heat is generated when coal adsorbs oxygen; this leads to the oxidation of the active structure, which then releases a significant amount of heat and finally leads to the spontaneous combustion of coal .…”

Section: Introductionmentioning

confidence: 99%

Study of the Change Laws of Free Radicals and Functional Groups during Coal Oxidation

et al. 2023

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In order to study the change laws of free radicals and functional groups during low-temperature coal oxidation, three coal samples with different metamorphic degrees were selected for ESR and FTIR analysis. The results showed that the concentration of free radicals increased as the temperature increased; meanwhile, the types of free radicals changed constantly, and the free radical variation range decreased with the increase in coal metamorphism. The side chains of aliphatic hydrocarbons in coal with a low metamorphic degree decreased by varying amounts in the initial heating stage. The −OH content of bituminous coal and lignite increased first and then decreased, while that in anthracite decreased first and then increased. In the initial oxidation stage, −COOH first increased rapidly, then decreased rapidly, and then increased before finally decreasing. The content of −C�O in bituminous coal and lignite increased in the initial stage of oxidation. Through gray relational analysis, it was found that there was a significant relationship between free radicals and functional groups, and −OH had the strongest correlation with free radicals. This paper provides a theoretical basis for studying the mechanism of functional groups transforming into free radicals in the process of coal spontaneous combustion.

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Analysis of oxidation pathways for characteristic groups in coal spontaneous combustion

Cited by 70 publications

References 30 publications

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

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

Study of the Change Laws of Free Radicals and Functional Groups during Coal Oxidation

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