Abstract: The original design plan and the optimum design scheme of the SECCO cracking furnace chamber was numerically simulated using CFD software with suit mathematical model. Detailed information of flow field，fuel combustion and flue gas temperature field in the cracking furnace chamber was obtained，which revealed the interaction and characteristics of flue gas flow，combustion and heat transfer process in the furnace. The simulation results showed that the temperature gradient was larger，the heat distribution was uneven and high-temperature zones existed in the original design plan based on bottom burner. While in the optimum design scheme based on bottom and side wall burner，the temperature gradient was smaller and more uniform heat distribution was provided，which is beneficial to the uniform heating of the reactor tubes.

摘要： 利用计算流体软件，采用合适的数学模型，对赛科（SECCO）裂解炉的两种设计方案进行数值模拟，得到裂解炉炉膛内流体流场、燃料燃烧和烟气温度场等详细信息，揭示了炉膛内烟气流动、燃烧和传热过程的相互影响及特点。模拟结果表明，底部燃烧器的原始设计方案中，热量分布不均，局部高温区，炉膛内温度梯度大；底部燃烧器加侧壁燃烧器的优化方案中，能提供较均匀的热量分布，炉膛内温度梯度小，有利于反应管均匀受热。