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为改善提升管反应器内气固两相速度及颗粒浓度径向分布的环-核特征,采用欧拉两相流模型和SIMPLE算法,对添加3种不同形式环挡板的提升管进行了流场与浓度场的分析,并与传统提升管进行对比。计算结果表明:添加环挡板并不能减弱提升管内气固两相的轴向返混,对于某些特定结构甚至还会出现明显的涡流现象;在提升管内添加环挡板能够较大程度地改善气固两相径向的速度分布和浓度分布,使主体段的流动更加接近平推流状态,有利于控制反应的进行。合理设定提升管中环挡板的结构和位置,能够改善气固两相的流动状态,从而控制和优化反应时间。
In order to improve the ring-core characteristics of radial distribution of gas-solid two-phase velocity and particle concentration in the riser reactor, the Euler two-phase flow model and the SIMPLE algorithm were used to improve the flow of risers with three different types of baffles Field and concentration field analysis, and compared with the traditional riser. The calculation results show that the addition of annular baffle does not weaken the axial backmixing of the gas-solid two-phase in the riser, and even obvious vortex phenomenon occurs in some specific structures. The addition of the annular baffle in the riser can be greatly improved The velocity distribution and concentration distribution of the gas-solid two-phase radial direction make the flow of the main body closer to the state of the flat push-flow, which is in favor of controlling the reaction. Reasonably setting the structure and position of the baffle in the riser can improve the flow state of the gas-solid two-phase, so as to control and optimize the reaction time.