Adding tubes on the bottom of delayed coking furnace is a useful measure for enhancing the throughput, but the distance between tubes and burners is too small to conform design standard. The security of these bottom tubes is uncertain. The processes of turbulence, combustion and heat transfer in the furnace were simulated by numerical method. Detailed information of velocity field, temperature field and heat flux was obtained. The heat transfer of tubes in entrainment zone of jet flame was investigated. The possibility of tube oxidation and hot spot was also discussed. Results show that the bottom tubes are security, which located in the low temperature field and the range of heat flux is 22～45 kW/m~2. The results are in good agreement with industrial testing data.
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