乙烯裂解炉反应管数学模拟新方法

综述了不同类型的乙烯裂解炉反应管数学模型，分析了各类模型的缺点。为此提出了一种进行反应管数学模拟的新方法。即应用CFD方法对反应管内流体流动、传热、传质及裂解反应过程，不经任何简化直接进行数值求解，得到了管内的流场、温度场和浓度场等详细信息。模拟计算得到了反应管长度方向上的温度、速度、压力和组分浓度的变化规律；在反应管径向上存在着明显的速度和温度分布，而组分浓度变化程度不如速度和温度明显；计算结果为提出结焦抑制方法提供了依据。

A new mathematical simulation approach for tubular reactors in ethylene pyrolyzer

The different mathematical models for tubular reactors were reviewed, based on which a new mathematical simulation approach for tubular reactors based on CFD technique was put forward. This approach completely took the flow, heat transfer, mass transfer as well as thermal cracking reactions into consideration. The coupling reactor model was solved with the application of SIMPLE algorithm. Some detailed information about the flow field, temperature field and concentration distribution in tubular reactors was obtained. The profiles of oil-gas velocity, pressure, temperature and components concentration along the length direction of reactor tubes were obtained. What is more, the steep velocity and temperature gradients along the radial position, and the less obvious radial profiles of components concentration, were found. These results provided guidance for inhibition of coke formation.