Fluidized bed reactor cyclone separator dipleg purging device

The utility model belongs to the technical field of coal-to-liquid, and relates to a fluidized bed reactor cyclone separator dipleg purging device. The utility model provides a fluidized bed reactor cyclone separator dipleg purging device in order to solve the problems that in an existing fluidized bed reactor cyclone separator dipleg purging device, nitrogen is insufficient, gas pressure is difficult to adjust, and the pressure difference in the device cannot be flexibly used. The dipleg purging pipeline is designed between the reduction compressor and the reduction reactor, so that gas in the reduction compressor can be conveyed into the reduction reactor, and the air pressure difference between the reduction compressor and the reduction reactor is about 0.3-0.5 MPa, so that the influence on the air pressure in the reduction reactor can be ignored; in addition, according to the air pressure difference, part of air pressure can be controlled to be introduced into a dipleg purging pipeline by adjusting a dipl