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.