Overview of commonly used materials for coal spontaneous combustion prevention

Li, Qingwei; Xiao, Yang; Zhong, Kai-Qi; Shu, Chi‐Min; Lü, Hui-Fei; Wu, Shi-Liang

doi:10.1016/j.fuel.2020.117981

Cited by 152 publications

(39 citation statements)

References 131 publications

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“…Existing anti-fire technologies all have varying degrees of success, but none are a complete solution. Physical inhibitors have inferior effects and a short duration, whereas chemical inhibitors have poorer safety performance and a higher cost [11,12]. Furthermore, the applications of both have constraints given the situation they are applied to.…”

Section: Introductionmentioning

confidence: 99%

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

Xiao

Zhang

et al. 2021

J Therm Anal Calorim

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Coal spontaneous combustion (CSC) is a major safety concern affecting not just miners and businesses, but of industry in China generally. Chemical methods are already widely applied in the field of CSC prevention and plays a vital role in suppressing its negative effects. Ionic liquids (ILs) are novel and environmentally friendly solvents that have shown possible inhibitory effects on CSC through controlling the reactive groups in coal's molecular structure. To study the effects of various ILs on CSC more thoroughly, this paper examined several types of IL that had been pre-treated for different periods and examined how they performed during different phases of the combustion process. A long flame coal type was selected and immersed in four ILs [BMIM][BF 4 ], [BMIM][NO 3 ], [BMIM][I], and [EMIM][BF 4 ]. Immersion periods were 2 days, 3 months, and 6 months; a raw coal sample was retained as a control. LFA 457 laser-flash apparatus determined the thermophysical properties of the samples between 30 and 300 °C. The kinetic process of the samples (30-800 °C) was deduced by thermogravimetric-differential scanning calorimetry thermal at various heating rates (2, 5, 10, and 15 °C min −1 ), and the thermal effect parameters were obtained. Results from this paper show that immersion treatment using ILs has an inhibitory effect on CSC, and the reliability of the thermophysical parameters was verified by uncertainty analysis. The pre-treated samples characteristics and exothermic peak temperature with different degrees of hysteresis were recorded, and statistical analysis verified the conclusions from the thermal physics experiments. The pre-treated sample with the greatest lag over various stages was found, and the apparent activation energy (E a ) of its rapid oxidation stage was calculated by Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods. Meanwhile, the two kinetic methods confirm each other and come to a conclusion after joint verification. The greatest E a found here was for a 6-month immersion coal sample using the IL [BMIM][BF 4 ].

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Section: Introductionmentioning

confidence: 99%

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

Xiao

Zhang

et al. 2021

J Therm Anal Calorim

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“…Coal has always been the main source of energy in the development of China, accounting for approximately 70% of the primary energy mix [1][2][3][4]. The development of industry depends on the supply of energy, therefore coal as a major energy source must strengthen the safety investment in the coal industry to ensure its long-term stable, healthy and sustainable development [5,6].…”

Section: Introductionmentioning

confidence: 99%

Research on the Damping Performance of Mining Highly Efficient Water-Retaining Colloidal Material Against the Spontaneous Combustion of Coal

Jin¹,

Li²,

Liu³

et al. 2021

ACSM

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In order to solve the shortcomings of the traditional mining anti-extinguishing gel material such as low strength and poor water retention, a high hydrocolloid anti-extinguishing material was developed with sodium alginate and light calcium carbonate as the base material and gluconolactone as the retarder, which was mixed and reacted. The base material ratio of highly efficient water-retaining colloidal material for coal void filling was determined as 2% SA + 0.5% PCC + 1% GDL with a moulding time of 4.5 min, while the base material ratio of highly efficient water-retaining colloidal material for extinguishing high temperature fires was 2.5% SA + 1% PCC + 1% GDL with a moulding time of 2.5 min. The highly efficient water-retaining colloidal material was found to reduce the concentration of signature gas and delay the characteristic temperature point and increase the activation energy of coal oxidation, which indicates that the highly efficient water-retaining colloidal material can effectively inhibit the spontaneous combustion process of coal at low temperature stage. Infrared spectroscopy experiments were conducted to investigate the microscopic resistance mechanism of the highly efficient water-retaining colloidal material, and the results showed that the highly efficient water-retaining colloidal material mainly reduce the activity of Ar-C-O-, -COO-, -CH3, -CH2 and -OH in coal to inhibit the spontaneous combustion of coal.

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“…The heat released in the reaction process is continuously gathered, causing coal to reach the self-ignition point under certain conditions, which leads to the occurrence of fire. 3 , 4 Therefore, approaching the effects of high sulfur content and high humidity conditions on the microstructure of anthracite is an urgent scientific issue to be solved. Therefore, it is necessary to study the microscopic mechanism of coal spontaneous combustion.…”

Section: Introductionmentioning

confidence: 99%

Effects of Moisture and Associated Pyrite on the Microstructure of Anthracite Coal for Spontaneous Combustion

et al. 2020

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To explore the micromechanism of the structural changes of anthracite due to heat accumulation by water and pyrite, during oxidation, anthracite with coal samples was selected in this work from Baijiao Coalmine, Sichuan, China. The samples were added with water of 1, 5, 10, 15, and 20 mass % and pyrite of 1, 2, 4, and 6 mass % and were conducted to experimented torts. As compared with the raw coal sample, the effects of water and pyrite on the microstructure of anthracite were studied. The results indicate that the oxygen-containing functional group of coal increases with the addition of water. The content of the aromatic structure in coal was thought to be due to water and pyrite synergistic effects. The synergistic effect of water and pyrite accelerates the oxidation process of seven types of active groups in coal samples. The water content was 10–15 mass %, and the associated pyrite content was 2–4 mass %; the contribution to the oxidation activity of the main active groups of coal was the largest under oxidizing conditions.

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Overview of commonly used materials for coal spontaneous combustion prevention

Cited by 152 publications

References 131 publications

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

Research on the Damping Performance of Mining Highly Efficient Water-Retaining Colloidal Material Against the Spontaneous Combustion of Coal

Effects of Moisture and Associated Pyrite on the Microstructure of Anthracite Coal for Spontaneous Combustion

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