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• W4295008042 endingPage "125397" @default.
• W4295008042 startingPage "125397" @default.
• W4295008042 abstract "To comprehensively investigate the multi-scale characteristics of coal spontaneous combustion, in situ infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) were utilized. The samples were pre-oxidized at 70 °C for 2, 4, 6, and 8 h (the raw coal and above samples were named R 0 , R 2 , R 4 , R 6 , and R 8 ), then the secondary oxidation experiments were carried out. The results showed that the contents of –OH, –C=O, and –C=C- increased with the pre-oxidation time. The aromatic structure of pre-oxidized coal is more susceptible to oxygen erosion during secondary oxidation. The migration and transformation of –OH, –C=O are the underlying causes of water evaporation and gas desorption during low-temperature oxidation. The spontaneous combustion behaviors in stage I and stage II have different reaction mechanisms and kinetic characteristics. In light of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS), the apparent activation energy of stage I is R 0 >R 2 >R 4 >R 6 >R 8 , and stage II is R 6 >R 8 >R 2 >R 4 >R 0 . Long pre-oxidation time in stage I will inhibit coal spontaneous combustion, while the opposite is true in stage II. By the Pearson correlation analysis, –OH is the key structure affecting the low-temperature endothermic stage of coal, revealing the correlation between the multi-scale thermal behavior of pre-oxidized coal spontaneous combustion. • Effect of pre-oxidation time on the macro and micro scale behavioral characterization of coal spontaneous combustion is investigated. • The pre-oxidation time significantly affects –C=O, –OH, and –C=C- over Ar-CH, –CH 2 -, –CH 3 during the initial oxidation of coal. • Long pre-oxidation time inhibits spontaneous combustion of pre-oxidized coal at low temperature. • -OH is a key functional group affecting the low temperature endothermic stage of coal." @default.
• W4295008042 created "2022-09-09" @default.
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• W4295008042 date "2023-01-01" @default.
• W4295008042 modified "2023-10-17" @default.
• W4295008042 title "Multiscale thermal behavioral characterization of spontaneous combustion of pre-oxidized coal with different air exposure time" @default.
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• W4295008042 doi "https://doi.org/10.1016/j.energy.2022.125397" @default.
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