Regenerated smoke pipeline

The invention belongs to the technical field of petroleum catalyzing and cracking, in particular to a regenerated smoke pipeline. The regenerated smoke pipeline is communicated with the top of a regenerator, at least one smoke speed limiting device is arranged in a place of the smoke pipeline, and the place of the smoke pipeline is close to the regenerator. The smoke speed limiting device comprises a speed limiting pipeline body, at least one speed limiting piece is arranged in the speed limiting pipeline body, the speed limiting piece comprises a current limiting plate and a current limiting ring which is located at an inner-diameter-reduced end of the current limiting plate, and the inner diameter of the current limiting plate is gradually reduced along the airflow direction. The inner diameter of the speed limiting pipeline body is larger than the inner diameter of the smoke pipeline, and the inner diameter of current limiting ring is not larger than the inner diameter of the smoke pipeline. The smoke spee