Inhibiting effects of 1-butyl-3-methyl imidazole tetrafluoroborate on coal spontaneous combustion under different oxygen concentrations

Lü, Hui-Fei; Xiao, Yang; Dajiang, Li; Yin, Liang; Shu, Chi‐Min

doi:10.1016/j.energy.2019.115907

Cited by 69 publications

(11 citation statements)

References 44 publications

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“…The reaction rate between oxygen and coal is the key factor influencing the heat release rate 35 . Studying the relationship between the heat release rate and reaction rate is beneficial to understand in the heat release process during coal oxygen-lean combustion in the O 2 /CO 2 /N 2 atmosphere, which can provide a theoretical foundation for revealing the law of coalfield fire spreading.…”

Section: Resultsmentioning

confidence: 99%

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Sci Rep

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Heat release of coal combustion in an oxygen-lean and multi-gas environment is a common phenomenon, coalfield fires caused by it can lead to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

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Section: Resultsmentioning

confidence: 99%

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Sci Rep

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show abstract

“…The reaction rate between oxygen and coal is the key factor in uencing the heat release rate [47]. Studying the relationship between the heat release rate and reaction rate is bene cial to understand in the heat release process during coal oxygen-lean combustion in the O 2 /CO 2 /N 2 atmosphere, which can provide a theoretical foundation for revealing the law of coal eld re spreading.…”

Section: 3mentioning

confidence: 99%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

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Coal combustion in an oxygen-lean and multi-gas environment is a common exothermic phenomenon for coalfield fires, leading to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. A delay of ignition and heat release existed during the coal oxygen-lean combustion in O2/CO2/N2. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

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“…Following the mass ratio 5:5:0.4 [38], take a certain amount of coal, distilled water, and IL and then mix by stirring for 8 h. When complete, allow the mixture to stand for 2 days, 3 months, and 6 months. After the sample has reached the required soaking pre-treatment time, dry it in a vacuum at 27 °C for 48 h, then seal and store as an IL CSC inhibitor sample.…”

Section: Coal Samplesmentioning

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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Inhibiting effects of 1-butyl-3-methyl imidazole tetrafluoroborate on coal spontaneous combustion under different oxygen concentrations

Cited by 69 publications

References 44 publications

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

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

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