本发明提出一种基于余能利用的湿煤预干燥系统及方法,包括第一预热仓,第二预热仓,热源传导装置和余热回收装置,第二预热仓底部出口与第一预热仓顶部进口通过落料管相连通,热源传导装置包括第一,第二加热蛇管,热源介质通过热源进管进入第一加热蛇管,从热源出管排出,第一预热仓顶部设有第一蒸汽管与第二加热蛇管相连,出口连接第二蒸汽管,第二预热仓顶部设有第三蒸汽管,余热回收装置包括蒸汽回收管,蒸汽循环管和冷凝水回收管,分别回收蒸汽和冷凝水,本发明利用干燥过程中产生的蒸汽进行新煤预热,提高蒸汽余能的使用效率。

The invention provides a wet coal pre drying system and method based on residual energy utilization, including a first preheating bin, a second preheating bin, a heat source conduction device and a waste heat recovery device, the bottom outlet of the second preheating bin is connected with the top inlet of the first preheating bin through a blanking pipe, the heat source conduction device includes first and second heating coils, and the heat source medium enters the first heating coil through the heat source inlet pipe, It is discharged from the heat source outlet pipe. The top of the first preheating bin is provided with a first steam pipe connected with the second heating snake pipe, the outlet is connected with the second steam pipe, and the top of the second preheating bin is provided with a third steam pipe. The waste heat recovery device includes a steam recovery pipe, a steam circulation pipe and a condensate recovery pipe to recover steam and condensate respectively. The invention uses the steam generated in the drying process for fresh coal preheating, Improve the utilization efficiency of steam residual energy.