Full
Outline
To investigate the combined effects of pre-oxidation and water immersion on the characteristics of coal oxidation combustion, a thermogravimetric analysis was performed on gas-coal samples subjected to various pre-oxidation temperatures and water immersion conditions. The characteristic temperature, activation energy and reaction rate of coal oxidation combustion under different conditions were analyzed, and the mechanism of the effects of pre-oxidation and water immersion on coal oxidation combustion was discussed. The results indicate that, compared to unoxidized raw coal, the characteristic temperatures of the combustion weight loss stage decreased by 2.8% and 0.2% at 150 ℃ and 240 ℃ pre-oxidation temperatures, respectively, while the activation energies decreased by 4.9% and 48.7%, respectively. Pre-oxidation increased the risk of coal spontaneous combustion, with higher pre-oxidation temperatures leading to a greater propensity for reignition. Furthermore, compared to pre-oxidized coal at 240 ℃, additional water immersion of this high-temperature pre-oxidized coal significantly lowered its oxidative combustion characteristic temperature and activation energy. The characteristic temperatures for the oxidation weight gain stage and combustion weight loss stage decreased by 65.2 ℃ and 16.3 ℃, respectively. The activation energy of the combustion mass loss stage decreases by 7.8 kJ·mol-1, indicating an increased risk of coal spontaneous combustion. The combustion reaction rate of coal decreases after water immersion. The value of pre-exponential factor(lnA) for raw coal after water immersion is reduced by 6.3% compared with raw coal, while for coal samples pre-oxidized at 240 ℃ and then treated with water immersion, lnA is decreased by 60.4%. When coal bodies undergo high-temperature oxidation, direct water injection for cooling is not recommended. Instead, other fire prevention and suppression measures such as injecting low-temperature nitrogen or liquid carbon dioxide should be prioritized.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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