关键词: ethylene;pyrolyzer;furnace;reactor tube;flue-gas;temperature;heat flux

Abstract: A good understanding of the detailed temperature distribution in the furnace plays an
important role in the implementation of operation optimization and design improvement of
ethylene pyrolyzer. Numerical simulation of the turbulent flow, combustion and heat
transfer was carried out to investigate the temperature distribution in industrial furnace.
Inhomogeneities of the flue-gas temperature distribution were observed in X, Y, and Z
direction of the furnace from the simulated results. Along the height of the furnace, the
average flue-gas temperature increased initially and decreased afterward, and reached its
peak at the height of 5 m. The reactor tube skin temperature varied not only along the
height of the furnace, but also around the circumference of the tube. The heat flux
profiles from the furnace towards the reactor tubes followed the shape of the average flue
-gas temperature profile. The heat flux of the inlet tubes was constantly higher than that
of the outlet tubes at the same height in the furnace.

Key words: ethylene, pyrolyzer, furnace, reactor tube, flue-gas, temperature