Intelligent dense control scheme based on ash content of raw coalIn this scheme, the separation density is taken as the controlled object, and the control idea of adjusting the dense medium separation operation (mainly the separation density) with the on-line ash content monitoring data of the washing raw coal belt is established, and an intelligent dense control system based on the ash content of the washing raw coal is designed. According to the raw coal ash content, combined with the raw coal washability curve, hydrocyclone parameters and separation pressure, the initial dense medium separation density suitable for the hydrocyclone is determined for separation; in the production process, the separation density is adjusted in real time according to the ash content data monitored by the online ash analyzer of the raw coal belt to maximize the efficiency of dense medium separation.