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In order to study the effects of different drying conditions on crushing rate and pulverization rate of Baoqing lignite after drying, as well as the effects of different drying moistures on spontaneous combustion and explosion characteristics of the coal samples, several experiments were conducted, like the drying of raw coal, and the spontaneous combustion and explosion characteristics of coal samples with different moisture contents. The results show that, a drying furnace temperature above 300 ℃ and a higher heating terminal temperature can achieve a higher coal sample dehydration rate. Coal particles with smaller particle sizes tend to achieve higher dehydration rates and lower crushing rates. The pulverization rate of 6~13 mm coal particles is the highest under different drying conditions. Baoqing raw coal is a type of coal that is prone to spontaneous combustion. As the moisture content of the dried coal sample decreases, the spontaneous combustion tendency of the raw coal weakens and becomes a type of coal with moderate spontaneous combustion tendency. As the moisture content of the coal sample increases, the explosion tendency of the test coal sample decreases. As the fineness of coal powder R90 increases, the explosion tendency of coal powder decreases. Therefore, in the engineering application process of Baoqing lignite drying technology, the proportion of 6~13 mm coal particles should be reduced to lower the pulverization rate during the drying process. The air temperature during coal powder transportation should be appropriately reduced, or the fineness of coal powder should be appropriately increased to reduce the tendency for explosion.
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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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