【摘要】 随着高品质优质煤在国民经济发展中的大量消耗，高含水煤的开发利用迫在眉睫。高含水煤水分含量高、发热量低、热稳定性差、易自燃，使得目前其综合利用受到严重制约，干燥脱水提质成为高含水煤高效开发利用的主要方向。以干燥褐煤为研究对象，通过系统分析干燥过程中原煤及干燥煤的物化性质演化规律及粉尘爆炸特性，为煤炭的干燥过程提供理论指导。研究结果表明：与原煤相比，干燥煤的内水含量增加，煤粒度减小，细粉含量增加且粉化率升高。干燥过程有效提高了煤的发热量，干燥煤发热量相比原煤提升了470 kcal/kg至872 kcal/kg。综合分析粉尘爆炸极限氧浓度、最小点火能和最小着火温度等指标，判定试验干燥褐煤的粉尘爆炸特性为高等级。更多还原

【Abstract】 With the extensive consumption of high-quality coal in the development of the national economy, the development and utilization of high-moisture coal is imminent. High-moisture coal has a high water content, low calorific value, poor thermal stability, and is prone to spontaneous combustion, which currently severely limits its comprehensive utilization. Drying and dehydration to improve quality has become the main direction for the efficient development and utilization of high-moisture coal. The physicochemical evolution of raw and dried lignite was investigated, focusing on changes during the drying process and the associated dust explosion characteristics. The findings revealed that in comparison to raw coal, dried lignite exhibited an increased internal moisture content, reduced particle size, elevated fine powder content, and a higher pulverization rate. Notably, the drying process significantly enhanced the calorific value of the coal, elevating it from 470 kcal/kg in raw coal to 872 kcal/kg in dried lignite. A comprehensive analysis of parameters such as limit oxygen concentration for dust explosion, minimum ignition energy and minimum ignition temperature indicated that dried lignite possessed pronounced dust explosion characteristics.更多还原