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在综合考虑流动、反应、传质的基础上 ,建立了适用于模拟提升管和下行床反应器中催化裂化过程的二维返混模型 ,并利用正交配置法进行数值求解 ,得到了各产物在两种反应器内的不同浓度分布规律。这种结果源于两者流动结构和混合状况的差异。和提升管相比 ,由于下行床内的气固两相流动更接近平推流 ,气固速度和颗粒浓度径向分布均匀 ,气固轴向返混小 ,因而可得到更高的汽油收率。
Based on the comprehensive consideration of flow, reaction and mass transfer, a two-dimensional backmixing model suitable for simulating the catalytic cracking process in riser and down-bed reactor was established, and the orthogonal configuration method was used to solve the problem. The products The distribution of the different concentrations in the two reactors. This result stems from the difference between the flow structure and the mixture status of the two. Compared with the riser, the gas-solid two-phase flow in the down-going bed is closer to the push-in flow, and the gas-solid velocity and the particle concentration are distributed in a radial direction and the gas-solid axial backmixing is small, .