轻质油裂解炉反应管的二维数学模型

A TWO-DIMENSIONAL MODEL FOR TUBULAR REACTOR OF A PYROLYZER

对大庆石脑油裂解炉反应管用二维模型进行数学模拟。该模型包括每一反应组分的质量连续方程,能量方程,以及流体的压力降方程,描述反应管径向及轴向各类参数的变化。用二维模型计算沿反应管径向及轴向的温度分布,所有组分的浓度或组成分布以及反应管的压力降。也用一维模型进行对比计算,在相同的进料组成和进料量,相同的反应管进、出口温度及压力时,用二类模型计算得的产物产率、裂解炉热负荷接近相同;但由二维模型计算得到的管壁温度、需要的辐射室烟气温度均较用一维模型计算的低,须用现场实测温度进行检验。用二维模型计算得到的数据清楚地反映了反应管内、尤其是径向的一些实际变化过程。

The tubular reactor of Daqing naphtha pyrolyzer is simulated by a two-dimensional model. The model consists of a mass continuity equation for each component, an energy equation and a pressure drop equation to describe the changes of various radial and axial Parameters. The radial and axial distribution profiles for temperature and concentration and the pressure drop within the reactor were calculated. Under the same conditions, such as feed composition and feed rate, temperature and pressure at the inlet and the outlet of the reactor, we also use a one-dimensional model to calculate the yields of components and heat load of the reactor, which are nearly the same as compared with those calculated from the two-dimensional model, but the temperature of the tube wall and combustion gas are higher than those of the latter, and it is subject to be checked with the operating data. The results calculated from the two-dimensional model clearly reflected the practical process conducted in the tubular reactor, especially the radial temperature and concentration profiles.