Power plant tail gas waste heat utilization device

The utility model discloses a power plant tail gas waste heat utilization device, relates to the technical field of power plants, solves the problem that smoke dust is adhered to the inner wall of a pipeline and cannot be cleaned, and comprises a main body, and a cleaning mechanism is arranged in the main body. Through mutual cooperation of the cleaning mechanisms, smoke dust on the inner wall of the pipeline is cleaned, the situation that the heat conduction effect of the pipeline becomes poor due to adhesion of the smoke dust is avoided, firstly, a micro electric push rod is started, the micro electric push rod drives a sealing plate to be pulled out leftwards, and meanwhile the sealing plate drives a first sliding rail to be pulled out leftwards in a first sliding groove; the bottom of the pipeline is opened, then a motor is started, the motor drives a ball screw to rotate through a rotating shaft, the rotating ball screw drives a ball nut to lift upwards, meanwhile, the ball nut drives a fixing rod and cl