Treating bituminous coal with ionic liquids to inhibit coal spontaneous combustion

Xiao, Yang; Lü, Hui-Fei; Yi, Xin; Shu, Chi‐Min

doi:10.1007/s10973-018-7600-5

Cited by 38 publications

(8 citation statements)

References 44 publications

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“…e lower the E a is, the easier the reaction is and the faster the reaction rate is. erefore, E a could be used as an indicator of spontaneous coal combustion propensity [35].…”

Section: Effects Of Macromolecular Colloids On Activation Energy (E a )mentioning

confidence: 99%

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Experimental Research on the Performance of the Macromolecule Colloid Fire-Extinguishing Material for Coal Seam Spontaneous Combustion

Fan

Wen

Zhang

et al. 2019

Advances in Materials Science and Engineering

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Coal resources are rich in China. They are mainly concentrated in the northwest region. But these resources also make the situation of spontaneous coal combustion hazards most serious in this area. Affected by the arid and semiarid climate, the water resource in this area is relatively scarce. In order to improve the utilization rate of water, a macromolecule colloid for coal mine fire fighting was developed in this research. The main components of the macromolecule colloid and the principle of gel formation were analyzed. The physical and chemical properties of the macromolecule colloid were analyzed by the time of gelation and the water loss. The water content of the macromolecule colloid was as high as 99%. The inhibition performance of the macromolecule colloid on coal fire was studied by the programmed heating device. The experimental results show that the macromolecule colloid has a significant inhibitory effect on the heating rate, oxygen consumption rate, and gas production rate. It inhibits the coal-oxygen composite by increasing the activation energy (Ea) of coal, which also has the effect of wrapping coal to isolate oxygen. The inhibition performance of the macromolecule colloid on coal fire disasters is better than that of water, water glass, loess compound colloids, and other traditional fire-extinguishing materials.

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“…e lower the E a is, the easier the reaction is and the faster the reaction rate is. erefore, E a could be used as an indicator of spontaneous coal combustion propensity [35].…”

Section: Effects Of Macromolecular Colloids On Activation Energy (E a )mentioning

confidence: 99%

“…According to the relationship between ln(P out ) and 1/T k in (5), the apparent activation energy (E a ) can be calculated [29,35,36]. Figure 16 shows the linear relationship between ln(P out ) and 1/T k for six coal samples (No.…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Experimental Research on the Performance of the Macromolecule Colloid Fire-Extinguishing Material for Coal Seam Spontaneous Combustion

Fan

Wen

Zhang

et al. 2019

Advances in Materials Science and Engineering

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“…Ionic liquids (ILs) are environmental-friendly green solvents that have attracted much attention in recent years. Compared with traditional solvents, ILs have very low vapor pressure, good thermal stability, and excellent dissolving ability and are expected to be good combustion inhibitors. − Painter et al conducted experimental studies on [Bmim]Cl, [Bmim]I, [Bmim][PF 6 ], [Bmim][CF 3 SO 3 ], and [Bmim][BF 4 ] dissolved coal and believed that ILs can destroy the intermolecular forces in coal, thus dissolving and dispersing coal. , Wang et al , analyzed the influence of [Aoemim][BF 4 ] and [Hoemim][BF 4 ], with oxygen-containing functional groups in the cations, on the functional groups of coal and confirmed that ILs can dissolve the oxygen-containing functional groups on the coal surface and thus inhibit the spontaneous combustion of coal. In addition, this research group subsequently applied [HOOCCH 2 mim][HSO 4 ] to efficiently extract sulfur structures, which are also important inducing factors for the spontaneous combustion of coal …”

Section: Introductionmentioning

confidence: 99%

“…ILs with fluorinated anions were stated to be better inhibitors than those with [NO 3 ] − and [I] − anions, − with the ability to lower the decomposition temperature, reducing the heat release rate of coal while increasing CO production . In addition, some choline amino acid ionic liquids were reported to be able to lower the decomposition temperature, fracture the coal particles, and reduce aliphatic carbon, carbonyl, and sulfur functional groups …”

Section: Introductionmentioning

confidence: 99%

Are Ionic Liquids Suitable for Suppressing Coal Spontaneous Combustion?

Huang

Wang

et al. 2021

ACS Omega

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Due to the reported fact that the active functional groups in coal can be dissolved and destroyed by ionic liquids, it is expected that the spontaneous combustion of coal can be affected from a thermodynamic perspective. However, ionic liquids with different thermal stabilities have distinct influences on coal combustion. Here, the thermal stability of long-flame coal in the presence of five pure ionic liquids ([Bmim][BF 4 ], [Bmim][Ac], [Bmim][NO 3 ], [Hoemim][BF 4 ], and [Pmim][BF 4 ]) was analyzed by thermogravimetric analysis, and the flammability of the raw coal, pure ionic liquids, and coal–IL mixtures (mass ratio of 1:1) were tested using a cone calorimeter according to the indexes of the time to ignition (TTI), mass loss rate (MLR), heat release rate (HRR), total heat release rate (THR), specific extinction area (SEA), and CO production. It is shown that the TTIs of mixtures containing coal-[Bmim][BF 4 ], coal-[Hoemim][BF 4 ], and coal-[Pmim][BF 4 ] are relatively long, and the MLR, HRR, THR, and SEA values are relatively low, indicating that these fluorine-containing ionic liquids have a better flame-retardant effect than the other two fluorine-free ones, which may be ascribed to their similar role to halogen inhibitors. In addition, the endothermic process of [Bmim][BF 4 ], [Hoemim][BF 4 ], and [Pmim][BF 4 ] can reduce the temperature of the coal surface and delay the ignition time of coal. In contrast, the TTI of coal-[Bmim][NO 3 ] and coal-[Bmim][Ac] mixtures is much shorter than that of coal alone, and the MLR, HRR, and THR values are larger. This may be caused by the poor thermal stability of the two nonfluorine ionic liquids that began to decompose and release heat prior to coal, providing a large amount of heat for the low-temperature oxidation of coal and thus accelerating coal oxidation and combustion. Although the F-containing ionic liquids show the ability to inhibit spontaneous combustion of coal to some extent, their organic cations are potentially combustible and release large amounts of heat, smoke, and CO under high temperatures.

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“…[1][2][3][4] Therefore, CSC prevention is of great significance for the safe production of coal. 5 Many methods have been proposed to inhibit CSC in underground coal mines. At present, a wide range of inorganic salts such as NaCl, MgCl 2 , and CaCl 2 has been considered for use in this role.…”

Section: Introductionmentioning

confidence: 99%

Effects of ionic liquid concentration on coal low‐temperature oxidation

Cui

Jiang

Zheng

et al. 2019

Energy Science & Engineering

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In order to find out the optimal concentration of ionic liquid to lower the cost of inhibiting coal spontaneous combustion, effects of aliphatic hydrocarbons, hydrogen bonds, and some structural parameters of coal samples treated with low‐concentration ionic liquids were analyzed through Fourier‐transform infrared spectroscopy (FTIR) and temperature‐programmed experiments. Meanwhile, the changes of index gases in the heating process were observed by the temperature‐programmed method. The results show that the contents of aliphatic hydrocarbons in the treated coal samples decrease remarkably, so does the length of aliphatic chain CH2/CH3; besides, the amount of CO produced also decreases to some extent. When the mass concentration ratio is 1:10, HB‐tc, BB‐tc, AC‐tc, and BN‐tc can reduce the spatial structure and enhance the structural stability of aromatic clusters in coal. The CO concentrations of 1:2 HB‐tc and 1:10 AC‐tc are obviously lower than that of raw coal, indicating their better inhibitory effects. The inhibitory effect of HB‐tc decreases with the decrease in concentration. With the rise of temperature, the effect of concentration on the inhibition of CO production gradually weakens at 180°C and 200°C. AC‐tc achieves the optimum inhibitory effect near 1:10 mass concentration ratio.

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Treating bituminous coal with ionic liquids to inhibit coal spontaneous combustion

Cited by 38 publications

References 44 publications

Experimental Research on the Performance of the Macromolecule Colloid Fire-Extinguishing Material for Coal Seam Spontaneous Combustion

Experimental Research on the Performance of the Macromolecule Colloid Fire-Extinguishing Material for Coal Seam Spontaneous Combustion

Are Ionic Liquids Suitable for Suppressing Coal Spontaneous Combustion?

Effects of ionic liquid concentration on coal low‐temperature oxidation

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