Coal ash preventing boiler from being contaminated and ash combined recycling system capable of

The utility model relates to a coal ash preventing boiler from being contaminated and ash combined recycling system. The coal ash preventing boiler from being contaminated and ash combined recycling system comprises a coal ash recycling system and an ash recycling system, the coal ash recycling system draws forth coal ash from a dust remover and delivers the coal ash to a coal mill. The ash recycling system collects ash of the slag bath of the boiler to a drying machine, crushes the dried ash, delivers the crushed ash to an ash warehouse, delivers the crushed ash to the coal mill, mixes and grinds the coal ash, ash and pulverized coal of raw coal to a needed particle size according to a certain proportion in the coal mill, and is spurted into the boiler chamber to burn through a burner. Along with the flow of smoke, the active sodium in the smoke is converted into an insoluble sodium salt. The coal ash preventing boiler from being contaminated and ash combined recycling system has the advantages of fixing the active sodium in the smoke, enabling the active sodium to generate the insoluble sodium instead of being condensed and adhered to the convection heating surface, cutting off the forming source of contamination, guaranteeing the safe operation of the convection, increasing the operation time of the boiler and improving the benefit of a power plant.