A novel composite inorganic retarding gel for preventing coal spontaneous combustion

Cheng, Jianwei; Wu, Yuhang; Dong, Ziwen; Zhang, Rui; Wang, Wenbin; Wei, Guoying; Chu, Tingxiang; Yu, Zhiwei; Qin, Yi; Liu, Guozhong; Li, Haijian

doi:10.1016/j.csite.2021.101648

Cited by 31 publications

(9 citation statements)

References 14 publications

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“…The dispersed particles of aerosols can consume free radicals in coal, inhibit alkane chain rupture, and reduce the oxidation activity of coal. 113 78,81,82,114,115 The gel composite foam prepared by adding foaming agent to gel base fluid has several characteristics, including large water retention, good heat resistance, and less dehydration. 94,[100][101][102]116 Dispersion of free radical scavengers in the foam wall increases the chemical corrosion inhibition of the foam material and expands the contact range of surface active sites.…”

Section: Other Inhibitory Materialsmentioning

confidence: 99%

Review and prospects of research on materials to prevent and extinguish mine fires

Niu

Sun

et al. 2023

Fire and Materials

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Coal spontaneous combustion (CSC) has hindered the utilization of coal resources and the development of the global economy for centuries. At present, many materials are used for preventing and extinguishing CSC fires, and different types of materials have various sites of action. In this paper, research on CSC fire prevention and extinguishing materials is reviewed and proposed. The preparation schemes and effects of physical barrier materials, chemical inhibitors, composite materials, and other fields of fire prevention materials were discussed. The improved compounding schemes of CSC inhibiting materials were analyzed regarding the characteristics of base materials and material properties. It was found that in the field of fire prevention materials, plant extracts, hydrolyzed proteins, biomass, and other green recycling materials have gradually become the new trend in materials. The composite material has a synergistic physical barrier and chemical inhibition and has a good inhibitory effect on coal heat storage and group activation, which has become an inhibitory material that is highly concerning. CSC inhibiting technology involving microbial control has emerged and exhibits notable characteristics, including a green cycle and long action time, but its application still needs to control the coexistence of heterogeneous microorganisms and improve the environmental livability. High‐quality firefighting materials, which are used in preventing battery fires, fighting building fires, inert coatings of cotton fabric, and other fields, have potential applicational value for CSC prevention. This review aims to provide new ideas for the research of CSC fireproof materials.

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Section: Other Inhibitory Materialsmentioning

confidence: 99%

Review and prospects of research on materials to prevent and extinguish mine fires

Niu

Sun

et al. 2023

Fire and Materials

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“…Coal occupies an important position in the world’s energy mix as an essential energy product and industrial raw material. − Global coal production exceeds 8.1 billion tonnes, accounting for roughly 27% of the primary energy applications . However, coal spontaneous combustion disasters are also widespread in major coal-producing regions, such as China, the USA, and Australia, causing serious economic losses and environmental hazards. − Many fire areas are subject to reignition after the coal fires have been extinguished due to the complexity of the mining conditions and the specific nature of coal. , The material composition and microstructure of these coals, which have undergone primary oxidation, are more profoundly altered, resulting in a secondary spontaneous combustion process that differs from the primary spontaneous combustion of coal. − Therefore, an in-depth study of the secondary spontaneous combustion of coal must be conducted.…”

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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“…Therefore, taking effective measures to prevent spontaneous coal combustion in coal mines is urgent. 4 …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, taking effective measures to prevent spontaneous coal combustion in coal mines is urgent. 4 Spontaneous coal combustion is a complex physical and chemical reaction process that involves interaction between momentum and chemical structures. 5−7 The low-temperature oxidation of coal is the primary cause of spontaneous coal combustion.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Water Evaporation on the Inhibition of Spontaneous Coal Combustion

et al. 2022

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Spontaneous coal combustion is the primary cause of coal mine fires. During the production process, spontaneous coal combustion in the goaf is often affected by air leakage, which weakens or annuls the effect of inhibitors and leads to secondary oxidation. However, the action mechanism of inhibitors on secondary oxidation spontaneous coal combustion remains unclear. Thus, this study analyzes the influence of moisture evaporation on the performance of a high-water-content physical inhibitor (HWPI) using the Carbolite temperature-programmed experiment, differential scanning calorimetry, scanning electron microscopy, and a MINI MR test. The results demonstrate that as the moisture content of the inhibitor decreased, after being treated with the HWPI and drying for 24 h, the concentrations of O 2 , CO, and CO 2 were found to be lower than the gas concentration of raw coal, which showed that although the moisture content is reduced, the treated coal sample still has a lower spontaneous combustion tendency than the raw coal. The apparent activation energy was reduced, and the heat absorption per unit time decreased, which eventually weakened or annulled the effect of the HWPI. Future research should further improve existing inhibitor types to reduce the impact of secondary oxidation on spontaneous coal combustion caused by water evaporation.

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A novel composite inorganic retarding gel for preventing coal spontaneous combustion

Cited by 31 publications

References 14 publications

Review and prospects of research on materials to prevent and extinguish mine fires

Review and prospects of research on materials to prevent and extinguish mine fires

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

Effect of Water Evaporation on the Inhibition of Spontaneous Coal Combustion

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