Abstract: In this paper, the CFD (Computational Fluid Dynamics) method is used to realize the full-scale simulation and analysis of flue gas flow and combustion heat transfer process in the hydrogenation reaction feed fired heater of a certain unit, and reveals the characteristics of flue gas flow and combustion heat transfer process in the hydrogenation reaction feed fired heater. The effects of the opening angles at the top of the two fuel gas secondary lances on the flue gas flow, flame shape, furnace temperature field, and furnace tube surface thermal intensity and thermal efficiency in the fired heater are analyzed and compared. The simulation results show that, compared with the 10° structure, the 5.5° structure has higher flame height, the high temperature area of the furnace wall moves upward, the heat absorption of the furnace tube at the same position is greater, and the overall thermal efficiency of the radiant furnace tube is increased by about 2%.

Key words: hydrogenation reaction feed fired heater , flue gas flow , flame shape , furnace temperature field , furnace tube surface thermal intensity