Experimental Study on a Metal-Chelating Agent Inhibiting Spontaneous Combustion of Coal

Qiao, Ling; Deng, Cunbao; Dai, Fengwei; Fan, Yu

doi:10.1021/acs.energyfuels.9b01775

Cited by 46 publications

(11 citation statements)

References 53 publications

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“…The temperature-programmed oxidation, differential scanning calorimetry and TG/DSC-FTIR coupling technology are often used to investigate the evolutions of coal mass, heat and gaseous products during coal spontaneous combustion. [23][24][25] In addition, activation energy is an important indicator for evaluating coal combustion reaction performance. 26 Various functional groups measured by FTIR reflect the micro-characteristics of coal.…”

Section: Introductionmentioning

confidence: 99%

“…The chloride inhibitors also have a certain corrosive impact on the underground metal equipment of coal mines. The temperature‐programmed oxidation, differential scanning calorimetry and TG/DSC‐FTIR coupling technology are often used to investigate the evolutions of coal mass, heat and gaseous products during coal spontaneous combustion 23‐25 . In addition, activation energy is an important indicator for evaluating coal combustion reaction performance 26 .…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Xue

Wang

et al. 2021

Fire and Materials

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Summary Mine fire caused by coal spontaneous combustion is one of the main safety problems in mining. For the purpose of developing a more effective inhibitor to suppress the coal spontaneous combustion, a compound deoxidization gel foam inhibitor was proposed by combining sodium dithionite deoxidizer with gel foam. An experimental platform was self‐built to evaluate the suppression characteristic of deoxidization gel foam. Experimental results showed that the deoxidization gel foam reduced the oxygen concentration to below 14% within 180 minutes. STA‐FTIR test indicated that the deoxidization gel foam raised the active temperature from 250.57°C to 275.18°C and reduced CO2 absorption peak from 0.2926 to 0.2201 at the reaction temperature 20°C. The activation energy was also increased from 85.69 to 95.59 kJ·mol−1 in thermal decomposition combustion that exhibited an excellent flame‐retardant efficacy on the coal, especially at the low temperature stage. CH3 and CH2 were reduced by 56.86% and 47.17% processed by deoxidization gel foam. Meanwhile, the significant reduction in the content of reductive functional groups indicated that the new inhibitor had a strong suppression capacity for coal spontaneous combustion. Based on above research, it is believed that this study will lay an important foundation in the widespread application of deoxidization gel foam technology for coal spontaneous combustion prevention in underground mines.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Xue

Wang

et al. 2021

Fire and Materials

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“…Conversely, a chemical inhibitor can exert an outstanding inhibitory effect during the whole stage of coal spontaneous combustion by hindering coal-oxygen free radical reactions and inhibiting the formation of active substances, which fundamentally prevents the spontaneous combustion of coal. 19 Because of this excellent feature, many investigators have hunted for or prepared chemical inhibitors for coal spontaneous combustion. For example, Qin et al 20 investigated a composite inhibitor consisting of a superabsorbent hydrogel and ascorbic acid (A), in which the H + released by ascorbic acid (A) was abstracted by peroxide radicals from the oxidation of aromatic or aliphatic structures in coal.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al 21 reported a free radical scavenger 2,2,6,6-tetramethyl-1-piperidinyloxy that combined with alkyl free radicals to form inactive substances, thus decreasing the activity of free radicals. Qiao et al 19 found that phytic acid could chelate with metals and inhibit the catalytic activity of metal ions, and inhibiting the chemical adsorption of coal to oxygen. These studies demonstrated the feasibility of inhibiting spontaneous combustion of coal by interrupting the free radical chain reaction and reducing the oxidation activity of free radicals.…”

Section: Introductionmentioning

confidence: 99%

“…Physical inhibitors show satisfactory results during the initial stage (temperature below 100 °C) of coal spontaneous combustion by physical paths of oxygen insulation and endothermic cooling but the inhibitory effect could be reduced or even extinguished over time. Conversely, a chemical inhibitor can exert an outstanding inhibitory effect during the whole stage of coal spontaneous combustion by hindering coal-oxygen free radical reactions and inhibiting the formation of active substances, which fundamentally prevents the spontaneous combustion of coal …”

Section: Introductionmentioning

confidence: 99%

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Study on the Chemical Inhibition Mechanism of DBHA on Free Radical Reaction during Spontaneous Combustion of Coal

Wang

Zhou

et al. 2020

Energy Fuels

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It is imperative to have an in-depth understanding of the chemical inhibition mechanism for spontaneous combustion of coal, not only for controlling and preventing spontaneous combustion of coal in the coal mining industry but also for reducing emissions of hazardous gases. N,N-dibenzylhydroxylamine (DBHA) as a hydroxylamine free radical scavenger can be chosen as a feasible stabilizer for the spontaneous combustion of coal. In this study, the inhibitory performance of DBHA was examined by investigating coal mass changes and heat release obtained from thermogravimetric and differential scanning calorimetry. The effect of DBHA on change of the active groups during coal oxidation at different temperatures was determined by in situ Fourier-transform infrared spectroscopy. Density functional theory was also introduced to optimize the active radical model and calculate thermodynamic parameters. Experimental results showed that DBHA exerted a strong inhibitory effect on the spontaneous combustion of coal, especially for lignite and sub-bituminous coal. DBHA can combine with a hydroperoxide intermediate to form a stable compound, causing the effect of reducing the free hydroxyl content in coal and interrupting the formation of aldehydes and carboxylic acids. Additionally, it can combine with alkyl radicals to form stable compounds. DBHA exhibits an inhibitory effect by increasing the activation energy at each stage, especially during the accelerated oxidation and quick oxidation stages. Furthermore, the possible reaction paths between free radicals and DBHA were also proposed on the basis of the experimental findings.

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DL‐malic acid for inhibiting the re‐ignition of long‐flame coal and its micro‐reaction mechanism

Bu,

Niu,

Wang

et al. 2024

Asia-Pacific J Chem Eng

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To study the metal ion chelating agent (DL‐malic acid) inhibiting oxidation characteristics of residual coal in goaf, the microscopic thermal transformation characteristics of the treated coal samples were obtained using apparent morphology, infrared spectroscopy, free radical testing, and thermal analysis. The results demonstrate that after the addition of malic acid, the sphericity and roundness of the coal samples decrease, and the small fractured particles accumulate in the pores of the oxidized coal samples and, thereby, reduce the number of coal–oxygen contact sites. The addition of 10% malic acid promotes the conversion of functional groups (FG) and free radicals in pre‐oxidized coal, inhibits the catalytic effect of metal ions, generates more active sites, and increases the total heat release during the combustion process. There are strong endothermic points in the malic acid‐treated coal samples, and the free water evaporation blocked by small particles in the holes delays the initial heat release temperature of the coal samples. Pre‐oxidation can promote changes in the valence state of metal ions in coal, increase the adhesion between broken pre‐oxidized coal particles via malic acid chelation, and lose the catalytic effect of metal ions; this inhibits the process of oxidative re‐ignition of coal samples.

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Experimental Study on a Metal-Chelating Agent Inhibiting Spontaneous Combustion of Coal

Cited by 46 publications

References 53 publications

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Study on the Chemical Inhibition Mechanism of DBHA on Free Radical Reaction during Spontaneous Combustion of Coal

DL‐malic acid for inhibiting the re‐ignition of long‐flame coal and its micro‐reaction mechanism

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