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Study on the Re-ignition Characteristics of High-Temperature Oxidization & Water Immersion Long-Flame Coal at Different Heating Rates.
- Source :
- Energy Sources Part A: Recovery, Utilization & Environmental Effects; 2023, Vol. 45 Issue 3, p7317-7328, 12p
- Publication Year :
- 2023
-
Abstract
- The water immersion residual coal tend to happen spontaneous combustion accidents after mining the coal seam. For exploring the oxidative re-ignition properties of high-temperature oxidized water-impregnated long-flame coal, the thermal evolution law toward each pre-oxidized coal soaked in water under varying heating rates (R<subscript>h</subscript>) (5, 10, 15°C/min) has been analyzed by thermogravimetric differential scanning calorimetry (TG-DSC). The findings are as follows: the DTG at the critical temperature (T<subscript>1</subscript>) and maximum weight loss temperature (T<subscript>5</subscript>) increases, the activation energy (E) decreases, and the heat output increases (maximum 6391J/g) with the rising R<subscript>h</subscript>. The violent oxidated reaction process of coal samples has been delayed as the R<subscript>h</subscript> was 10°C/min. The water-immersed coal sample (I<subscript>200</subscript>) contains more free water on the surface, and the maximum (0.45 mW/mg) and total (178.8 J/g) heat absorption of are higher. Oxidation at 200°C and soaking in water (O<subscript>200</subscript>I<subscript>200</subscript>) reduced the ignition point temperature (minimum 399°C) and E (minimum 18.5 kJ/mol), and increased the total heat release (maximum 323 J/g) making it easier to oxidize and re-ignite. Under the same R<subscript>h</subscript>, the oxidation and combustion traits of each pre-oxidized water-immersed coal (PWIC) remained unchanged. Reducing the R<subscript>h</subscript> can effectively prevent spontaneous combustion of high-temperature oxidized water-soaked coal in shallow-buried and short-distance coal seams in northwest of China. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15567036
- Volume :
- 45
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Energy Sources Part A: Recovery, Utilization & Environmental Effects
- Publication Type :
- Academic Journal
- Accession number :
- 169920535
- Full Text :
- https://doi.org/10.1080/15567036.2023.2221662