Effect of inhibitors on the thermodynamics and kinetics of spontaneous combustion of coal

Tan, Bo; Wei, Hongyi; Zhang, Feichao; Xu, Bin; Chen, Kunliang

doi:10.1007/s10973-019-08771-y

Cited by 21 publications

(2 citation statements)

References 28 publications

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“…The reduction in maximum exothermic power presents a negative correlation with the reaction temperature and reaches the lowest (4.6%) at 40°C. The peak area of reaction interval is integrated in the DSC curve to acquire the heat generated during the thermal decomposition of unit mass sample that is called enthalpy, 29 as labelled in Figure 10. The enthalpy processed by deoxidization gel foam reduces by 5134 J/g with decreasing amplitude of 25.80% at 20°C.…”

Section: Resultsmentioning

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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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: Resultsmentioning

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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“…in coal samples increases rst and then decreases, reaching the maximum of 42.2% at 100 ℃. This is because the initial stage of coal oxidation is the oxygen absorption and weight gain stage (Tan et al 2020b). In this stage, chemical adsorption of oxygen is gradually enhanced, forming a large number of oxygen-containing functional groups and increasing the total mass of the coal sample.…”

Section: Ftir Functional Groupsmentioning

confidence: 99%

Study on the thermal kinetics and microscopic characteristics of oxidized coal

Wang

Zhu

Huang

et al. 2023

Environ Sci Pollut Res

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Revealing the characteristics of spontaneous combustion and re-combustion of oxidized coal is of great signi cance for the coal re prevention and control. Synchronous Thermal Analyzer (STA) and Fourier Transform Infrared Spectrometer (FTIR) were used to measure the thermal kinetics and microscopic characteristics of coal samples with different oxidation degrees (unoxidized, 100 ℃, 200 ℃ and 300 ℃ oxidized coal). It is found that the characteristic temperatures decrease rst and then increase with the increasing degree of oxidation. The ignition temperature of 100 ℃-O coal (oxidized at 100 ℃ for 6 h) is relatively the lowest at 334.1 ℃. Pyrolysis and gas-phase combustion reactions dominate the weight loss process, while solid-phase combustion reactions are relatively minor. The gas-phase combustion ratio of 100 ℃-O coal is the highest at 68.56%. With the deepening of coal oxidation degree, the relative content of aliphatic hydrocarbons and hydroxyl groups gradually decreases, while that of oxygen-containing functional groups (C-O, C = O, COOH, etc.) increases rst and then decreases, reaching the highest value of 42.2% at 100 ℃. Moreover, the 100 ℃-O coal has the minimum temperature at the point of maximum exothermic power of 378.5 ℃, the highest exothermic power of -53.09 mW/mg and the maximum enthalpy of -18579 J/g. All results show that 100 ℃-O coal has the highest risk of spontaneous combustion than the other three coal samples. This suggests that there is a maximum point of spontaneous combustion risk in the range of pre-oxidization temperatures of oxidized coal.

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