连续重整径向再生器烧炭区的数值模拟

SIMULATION OF COKE BURNING ZONE IN CATALYST REFORMING MOVING BED REGENERATOR

对连续重整径向再生器烧炭区的化学反应过程及传递过程进行了详细的理论分析 ,建立了烧焦反应的本征动力学方程、催化剂内外扩散模型、床层中传质、传热模型以及气固两相的流动模型 ,并在此基础上建立了错流移动床烧焦数学模型。运用该模型计算了连续重整再生器烧炭区床层内的温度、氧浓度和炭浓度的分布。研究结果表明 ,在床层上部内筛网处出现恒定的高温区 ,通过控制再生循环气中氧气的浓度可以控制床层的最高温度 ,并且两段烧焦有利于减少烧焦所需要的床层长度。模拟计算得到的再生器烧炭区床层温度分布与工业现场测量值基本吻合 ,该模型可用于分析和预测连续重整再生器烧炭区床层的温度、氧浓度和炭浓度分布 。

Based on the theoretical analysis on the chemical reaction and transferring in the coke burning zone of catalyst reforming regenerator, the inner and extra diffusion model of catalyst, mass and heat transport model in the moving bed, and flowing models of the gas and solid phases are developed. A mathematical model of coke burning on reforming catalyst in crossing flow moving bed regenerator is built up. Based on this mathematical model, the distributions of temperature, oxygen and carbon contents in the coke burning zone of catalyst reforming regenerator are obtained. Analysis on the result shows that the calculated temperature distributions in the burning zone are basically consistent with those determined in commercial practice.