Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

Chaoyu, Hao; Chen, Yanling; Wang, Jiren; Deng, Cunbao; Xu, Guang; Dai, Fengwei; Si, Rui; Wang, Hongfei; Wang, Haoyu

doi:10.3390/en11040789

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…18,19 An ironbased deoxidization inhibitor made from reduced iron powder and other components has the dual role of oxygen consumption and inhibition. 20 The gel foam effectively covers the coal body for a long time to prevent coal spontaneous combustion due to the excellent properties of temperature resistance, film formation and inhibition. 21 Some chloride inhibitors previously can only reduce the exposure of coal to oxygen and cannot completely reduce the oxygen concentration in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…The flame‐retardant efficiency rises with the increase of temperature 18,19 . An iron‐based deoxidization inhibitor made from reduced iron powder and other components has the dual role of oxygen consumption and inhibition 20 . The gel foam effectively covers the coal body for a long time to prevent coal spontaneous combustion due to the excellent properties of temperature resistance, film formation and inhibition 21 .…”

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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“…Because of the limited inhibitory effect, new inhibitors have been developed. The reducing agent SnCl 2 and iron-based deoxidizing inhibitor are, respectively, added to coal as an oxygen-consuming agent, preferentially adsorbing oxygen and reducing the absorption of oxygen by the coal to delay the spontaneous combustion of the coal. Catechin and poly(ethylene glycol), ascorbic acid, proanthocyanidin, TEMPO, , and so forth are added as antioxidants to the coal to consume the free radicals generated during the oxidation of coal, inhibiting the spontaneous combustion of coal.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

Self Cite

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In order to inhibit the intrinsic metal in coal to catalyze the spontaneous combustion of coal, three different types of metal-chelating agents were selected to react fully with coal, and thermogravimetric and differential scanning calorimetry curves of coal samples and gas generated during coal oxidation were obtained through temperature-programmed experiments. The effects of these additives on coal spontaneous combustion were analyzed by characteristic temperature, exothermic peak parameters, and CO and CO2 emission laws. The results show that the addition of oxalic acid promotes the spontaneous combustion of coal, ethylenediaminetetraacetic acid, and phytic acid and can inhibit the spontaneous combustion of coal, and the inhibition effect of phytic acid is better. The mechanism of phytic acid inhibition of coal samples was analyzed by Fourier transform infrared spectroscopy. It was found that phytic acid can capture metal ions in coal to form stable chelates. The oxygen-containing functional groups in coal combine to form an ether, ester, and hydrogen-bonded cross-linking structure, which improve the stability of coal macromolecules. In the oxidation reaction, phytic acid reduces the free radical content of the system and inhibits the chemical adsorption of coal to oxygen, thereby delaying the spontaneous combustion of coal. The inhibitory effect of phytic acid on the spontaneous combustion of coal with different metamorphic degrees was compared. It was found that phytic acid had a significant inhibitory effect on low rank coal. The minerals in the coal were analyzed by water and hydrochloric acid treatment, and it was found that the phytic acid was mainly combined with the exchangeable minerals in the coal. It is considered that phytic acid is a new type of high-efficiency low rank coal spontaneous combustion inhibitor, and it is very friendly to the environment. The results can provide new ideas for preventing the spontaneous combustion of coal.

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“…Coal fire accidents, which are caused by the spontaneous combustion of coal, account for more than 60% of mine fire accidents [5][6][7]. A wide range of spontaneous combustion reactions cause a serious problem for coal workers, equipment, and the environment [8][9][10]. Therefore, much importance should be given to preventing and extinguishing coal fires in goafs.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Heat and Mass Transfer of Liquid Nitrogen in a Loose Medium

Zhang

Lei

et al. 2019

Energies

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Liquid nitrogen is a vital medium during the extinguishing and chilldown process of coal spontaneous combustion in coal mine goafs. In this paper, the heat and mass transfer of liquid nitrogen in a loose medium was investigated. A laboratory system including a temperature sensing system was designed and built to explore the effects of different nitrogen injection positions and angles on the chilldown effect. The results indicate that after liquid nitrogen injection, the temperatures in the liquid nitrogen flow area and the bottom of the model can be quickly reduced to −196 °C, which was the best chilldown effect zone. With the vaporization of the liquid nitrogen, the cryogenic nitrogen gradually diffused. At 20,000 s, the bottom temperature was about –63 °C, the middle was –30 °C, and the upper was 0 °C. When the model angle was 0°, the effective chilldown zone was the largest. As the angle increased, the effective chilldown volume and holding time decreased significantly. The model angle had a greater impact on the chilldown. For the position of nitrogen injection, the inlet was set slightly farther from the gas outlet’s position, leading to a larger coverage for the liquid nitrogen and cryogenic nitrogen chilldown. This study can provide a theoretical basis for the flow and chilldown of nitrogen injection in goafs.

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Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

Cited by 11 publications

References 13 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

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

An Experimental Study on the Heat and Mass Transfer of Liquid Nitrogen in a Loose Medium

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