Spontaneous Combustion Characteristics of Wetting Coal under Different Prepyrolysis Temperatures

Wang, Kai; Fan, Haohao; Gao, Peng; He, Yunzhong; Pan, Shu

doi:10.1021/acsomega.0c05172

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…The period of steady growth (2009-2019) was an important phase in the global MFPC research journey, which lasted for a decade, and the annual publication volume in the field showed a continuous and steady increase, with an average of about 25 academic articles published each year [51][52][53][54][55]. During the explosive growth period (2020 to 2023), the average number of papers published in the direction of MFPC in this stage is 107 per year, and the number of papers has surged [56][57][58][59][60][61][62][63]. The main reason is that the research in MFPC field continues to deepen, resulting in an increasing number of fruitful results accumulated by researchers, which not only build a solid foundation for subsequent research but also indicate the direction of research.…”

Section: Year-to-year Trends In the Number Of Articles Issuedmentioning

confidence: 99%

Spatiotemporal Evolution and Frontier Focus Analysis Based on Coal Fire Control Body of Knowledge

Han,

Niu,

Liu

et al. 2024

Fire

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Mine fire accidents frequently constitute a major threat to mining safety, and their potential consequences are extremely severe, which highlights the urgency of fire prevention and control research. In this study, the CiteSpace software was used to conduct a metrological analysis of 717 relevant studies in the field of mine fire prevention and control (MFPC), aiming to reveal the research trends and trends in this field. This analysis found that the annual number of MFPC articles showed a significant upward trend, indicating that it is in rapid development during the active period. China, the United States, and Australia are the main contributors in this field, and the institutional contribution of China University of Mining and Technology is particularly outstanding, reflecting the regional concentration of research activities. The analysis of cooperation networks reveals the close cross-regional collaboration among European countries. The inhibition effect and evaluation criteria and the inhibition technology under different coal characteristics have become the focus of research. Activation energy, release, and quantum chemistry have become recent hot spots, reflecting the research on the mechanism of forward physicochemical synergistic inhibition and the in-depth exploration of the molecular level. It indicates that future research will focus on the development of temperature-responsive retardant materials, the application of quantum chemistry theory, and the exploration of the microscopic mechanism of coal spontaneous combustion through molecular simulation technology to further optimize the fire prevention strategy. In summary, the findings of this study not only provide a comprehensive picture of current research activities in the MFPC field but also indicate potential directions for future research and have important guiding significance for promoting the development of this field.

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Section: Year-to-year Trends In the Number Of Articles Issuedmentioning

confidence: 99%

Spatiotemporal Evolution and Frontier Focus Analysis Based on Coal Fire Control Body of Knowledge

Han,

Niu,

Liu

et al. 2024

Fire

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“…Pis et al investigated the effect of preoxidation on the early autothermal behavior of coal using differential thermal analysis. Wang et al − concluded that the characteristic parameters, such as exotherm, gas products, and the apparent activation energy of coal, more significantly changed after preoxidation. Tang et al studied the mass and heat changes after preoxidation and concluded that preoxidation increases the risk of spontaneous combustion of lignite, but excessive preoxidation temperatures have the opposite effect.…”

Section: Introductionmentioning

confidence: 99%

Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

2023

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To investigate the effect of preoxidation on the secondary spontaneous combustion of coal, the changes in the key groups and thermal characteristic parameters in coal after preoxidation were investigated through Fourier transform infrared spectroscopy (FTIR), laser thermal conductivity, and thermogravimetric experiments. Results showed that the aromatic hydrocarbons in coal gradually decrease with the rise in the preoxidation temperature, the aliphatic hydrocarbons increase and then decrease, the −C–O– group gradually decreases, and the −CO and −COO– group content slowly increases. Preoxidation promotes the breakdown of aromatic hydrocarbons and the oxidation of oxygen-containing functional groups in coal. Meanwhile, the thermal diffusivity of coal decreases after preoxidation, while the specific heat capacity and thermal conductivity increase and then decrease. The results of the thermogravimetric analysis indicate that preoxidation changes the characteristic temperature, but it does not change the process of spontaneous combustion. The spontaneous combustion process of raw and preoxidized coals can be divided into three stages: water evaporation, oxygen adsorption, and combustion. Further, the apparent activation energy increases and then decreases with a rise in the preoxidation temperature during the moisture evaporation stage, increases during the oxygen adsorption stage, and decreases during the combustion stage.

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“…Zhang et al 16 adopted TG/DSC-FTIR to analyze the macroscopic characteristics of functional groups in the process of coal spontaneous combustion, which indicates that −OH is the most active group in coal spontaneous combustion. Wang et al 17 investigated the influence of pre-pyrolysis temperatures on the spontaneous combustion characteristics of wetting coal. Xu et al 18 studied the combustion (secondary oxidation) characteristics of jet coal after oxidation and water immersion, and the results showed that water immersion had both inhibition and promotion effects on spontaneous combustion.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Characteristics of Jet Coal and Oxidation of Residues in Zhundong Coalfield Fires

et al. 2021

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Coalfield fire area reburning is one of the serious disasters in fire prevention and safety production. In this study, a synchronous thermal analyzer was used to conduct isothermal pyrolysis of jet coal at different temperatures, and the reaction characteristic parameters of different pyrolysis residual structures were analyzed. FTIR was used to measure group contents in raw coal and different pyrolysis residues. Programmed oxidation thermogravimetric experiments were carried out on the residues to obtain their oxidation characteristic parameters. The results demonstrated that the reaction characteristic parameters of the residual structures changed at 450 °C. The pyrolysis reaction mainly affected the variation of hydroxyl, aliphatic hydrocarbon, and aromatic hydrocarbon groups. The increase in pyrolysis temperature resulted in the decline in hydroxyl and aliphatic hydrocarbon groups as well as the increase in the aromatic hydrocarbon group. After pyrolysis, the ignition point temperature of the coal sample decreased, which causes the coal more likely to spontaneously ignite. It indicated that the pyrolysis residue at 450 °C is most likely to reburn. Compared with raw coal, the maximum combustion intensity of the pyrolysis residue was greatly increased, which reached the peak at 500 °C.

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Spontaneous Combustion Characteristics of Wetting Coal under Different Prepyrolysis Temperatures

Cited by 16 publications

References 35 publications

Spatiotemporal Evolution and Frontier Focus Analysis Based on Coal Fire Control Body of Knowledge

Spatiotemporal Evolution and Frontier Focus Analysis Based on Coal Fire Control Body of Knowledge

Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

Pyrolysis Characteristics of Jet Coal and Oxidation of Residues in Zhundong Coalfield Fires

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