Fluidized bed pulverized coal gasification device and technology with zero emission of fly ash

The invention discloses a fluidized bed pulverized coal gasification device and technology with zero emission of fly ash. The fluidized bed pulverized coal gasification device includes a gasificationsystem consisting of a gasifier, a high temperature cyclone separator, a waste heat boiler, a high efficiency cyclone separator and a dust collector, and a material return system consisting of a one spin dipleg, a one spin loop seal, a two spin dipleg, a two spin loop seal, a high efficiency cyclone dipleg, a high efficiency cyclone loop seal, a dust collector dipleg and a dust collector loop seal, a primary ejector, a secondary ejector, a tertiary ejector and a material return pipe. The cooperative usage of the gasification system and the material return system of the fluidized bed pulverizedcoal gasification device can directly and completely return coarse fly ash and fine fly ash captured by a gas-solid separator under high pressure to a high temperature central jet zone of the gasifier and maintain temperature