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本文采用Fluent软件对某裂解炉辐射段进行了数值模拟,计算中使用标准k-ε湍流模型、有限速率/涡耗散燃烧模型和离散坐标辐射模型,模拟结果与工厂数据一致。在此基础上,对辐射段进行了瞬态计算,模拟结果表明,烟气在炉膛中下段和炉顶拐角处形成回流,中下段回流有助于炉膛内对流换热,而炉顶拐角处回流使辐射段出现局部高温区:烟气循环有助于建立稳定的温度场;侧壁烧嘴使炉膛温度更为平均。本文模拟结果对裂解炉的设计和操作优化具有参考意义。
In this paper, Fluent software was used to simulate the radiant section of a pyrolysis furnace. The standard k-ε turbulence model, the finite rate / eddy-current dispersion combustion model and the discrete coordinate radiation model were used in the calculation. The simulation results are consistent with the factory data. On the basis of this, a transient calculation of the radiation section was carried out. The simulation results show that the flue gas forms a return flow in the middle and lower sections of the furnace and the corners of the furnace roof, and the backflow in the middle and lower sections contributes to convection heat transfer in the furnace. So that the radiation section of the local high temperature zone: flue gas circulation helps to establish a stable temperature field; side burner so that the furnace temperature is more average. The simulation results in this paper have reference significance for the design and operation optimization of cracking furnace.