On the emergence of local defects in the pipe coil pyrolysis furnaces | Mekhanika | kompozitsionnykh | materialov i konstruktsii
> Volume 10 > №3 / 2004 / Pages: 341-346

On the emergence of local defects in the pipe coil pyrolysis furnaces

, ,

Abstract:

The results of metallographic analysis and X-ray analysis of local defects occurring in tubular coils of pyrolysis furnaces in operation. It is shown that the saturation metal carbon diffusing from the inner surface of the chimney, due to the local deposition of coke is formed nickel carbide formation α-phase coming σ-phase with its subsequent decay of Fe and Cr, which leads to local changes in geometry in the art area, and can eventually cause partial unsealing of the pyrolysis furnace coil.

Keywords:

4