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环形分布器是实现载热体在列管式固定床反应器壳程均匀流动的重要部件。采用计算流体力学方法对丙烯氧化反应器壳程熔盐在改进结构型式(即椭圆扩张型进口,进口处两侧分别设置呈45°的导流挡板,挡板上均匀分布小孔,不均匀的开孔方式)的环形分布器内的变质量流动进行了模拟研究,分析了环形分布器内的速度及静压分布规律,并与传统型式环形分布器进行对比,并考察了出口分布孔数目及进口熔盐流量对均布效果的影响。通过计算发现,改进结构的分布器均布特性优于传统结构;优选24个分布孔能够满足流体均布的要求,且分布孔达到36,流体均布情况基本稳定;减小进口熔盐流速,进口区域速度及静压波动较小,减小了进口能量损耗,有利于流体均布。
The annular distributor is an important component to realize uniform flow of the heating medium in the shell-and-tube fixed bed reactor shell. The computational fluid dynamics (CFD) method was used to measure the molten salts in the shell of the propylene oxide reactor in the improved structure type (ie, oval expansion type inlet and outlet sides were set 45 ° diversion baffle, baffle uniformly distributed holes, uneven Of the open-hole mode) of the annular distributor of the variable mass flow simulation study, analysis of the annular distributor velocity and static pressure distribution, and compared with the traditional type ring distributor, and investigated the number of outlet distribution hole And the impact of imported molten salt flow on the uniform effect. The results show that the distribution characteristics of the distributor with improved structure are better than those of the traditional structure. The 24 distribution holes can meet the requirement of uniform distribution of fluid, and the distribution holes reach 36, the distribution of fluid is basically stable. Import region speed and hydrostatic pressure fluctuations smaller, reducing the import of energy loss, is conducive to fluid uniform.