关键词: 乙烯, 裂解炉, 数值模拟, 速度, 温度, 浓度, 热通量

Abstract: Numerical simulation on the USC tube-type ethylene pyrolyzer was carried out. Some detailed information about flow field, temperature field and concentration distribution was obtained, which revealed the basic characteristics of flow, heat transfer, mass transfer and reaction processes in the pyrolyzer. The results indicated that there were highly non-uniform distributions of flue-gas velocity, concentration and temperature in the furnace, which caused non-uniform distribution of tube skin temperature and heat flux of reactor tubes. On the other hand, the profiles of oil-gas velocity, pressure, temperature and components concentration along the vertical direction of reactor tubes were obtained. The steep velocity and temperature gradients along the radial position, and less obvious radial profiles of components concentration were also found.

Key words: ethylene, pyrolyzer, numerical simulation, velocity, temperature, concentration, heat flux