Heat transfer enhancement pipes, and pyrolysis furnaces comprising them, atmospheric and vacuum heating furnaces

摘要

The present invention relates to the field of fluid heat transfer, and discloses a heat transfer enhancement pipe as well as a pyrolysis furnace and an atmospheric and vacuum furnace comprising the same. The heat transfer enhancement pipe 1 includes a tube-shaped pipe body 10 having an inlet 100 for inflow of fluid and an outlet 101 for outflow of the fluid; The inner wall of the pipe body 10 has pins 11 projecting toward the inside of the pipe body 10, where the pins 11 have one or more pin sections extending helically in the axial direction of the pipe body, respectively The pin section of has a first end surface facing the inlet and a second end surface facing the outlet, wherein at least one of the first end surface and the second end surface of the rib sections extends helically It is formed as a transition surface along the direction. The heat transfer enhancement pipe can reduce its own thermal stress to increase the service life of the heat transfer enhancement pipe.