乙烯裂解炉辐射段三维流场和燃烧的数值模拟计算

Numerical Simulation on Three-Dimensional Turbulent Flow and Combustion in Firebox of Ethylene Cracking Furnace

采用计算流体力学方法以某种新型乙烯裂解炉辐射段为几何模型,保留特殊结构的瓦斯燃烧器原型未作简化,对计算域进行几何建模和网格划分,用标准的k-ε湍流模型、双δ概率密度函数扩散燃烧模型和蒙特卡洛辐射传热模型对炉内的燃烧和辐射状况进行三维全尺寸数值计算,以研究炉膛内的燃烧、传热和烟气流动情况。计算得到的流场合理,火焰形状和温度分布与实际吻合良好,说明对裂解炉辐射段的数值模拟计算是成功的。该模拟计算为指导燃烧器选型、优化设计裂解炉结构提供理论参考。

Three- dimensional turbulent, flow and combustion in firebox of ethylene cracking furnace were simulated by computational fluid dynamics method to investigate turbulent combustion, heat transfer and flue gas flow. Furnace geometry and mesh of simulation domain were created with special structural gas burner. Standard k - ε turbulence model, double - δ combustion model and Monte - Carlo radiation model were used to close control equations. Result of simulation gave good agreement with real situation in industry, especially flame shape, flow field and temperature field. The successful simulation offered technical support to gas burner selection, optimum design of furnace structure and improvement of furnace performance.