System for returning fly ash of circulating fluidized bed gasification furnace to gasification furnace for regasification

The utility model discloses a system for returning fly ash of a circulating fluidized bed gasification furnace to the gasification furnace for regasification, which comprises the gasification furnace, a high-temperature cyclone separator, an air preheater, a waste heat boiler, a cyclone separator and a bag-type dust collector which are connected in sequence, the material returning device is connected with a material returning opening in the lower section of the gasification furnace; fly ash outlets at the bottoms of the waste heat boiler and the cyclone separator are respectively connected with corresponding bin pumps, each bin pump is provided with a carrier gas inlet, a fly ash inlet and a fly ash outlet, and the fly ash outlet of each bin pump is connected with a return feeder of the high-temperature cyclone separator or an outlet pipeline of the return feeder or a fly ash bin through a conveying pipeline. The system disclosed by the utility model is simple, low in production cost and operation cost, envir