晃动工况下络合铁法脱硫反应器流体力学行为分析

Analysis of hydrodynamic behavior of complex iron desulfurization reactor under sloshing condition

探究晃动对鼓泡塔液位及气液分布的影响,为海上络合铁法脱硫工艺应用提供理论指导。利用自主搭建的鼓泡塔晃动实验装置,进行了鼓泡塔晃动实验;并利用CFD数值模拟软件,对晃动工况下鼓泡塔内流场分布进行了三维数值模拟。结果表明,双主管交叉式气体分布器用于鼓泡塔具有更好的均布性能,相比单管式气体分布器,气体分布不均匀度降低15.76%;晃动工况下鼓泡塔液位呈周期性变化,气体分布器浸没深度降低,液位波动幅度最高可达21.1%;整体气含率随晃动角度增加而降低,增大表观气速或降低初始液位高度可减小晃动的影响;塔内气液分布随晃动呈周期性变化,气体分布不均匀度增大,且在高径比小于1.5的塔段内,气液分布受晃动影响较为显著。

The study on the influence of sloshing on liquid level and gas-liquid distribution of bubble column can provide theoretical guidance for the application of complex iron desulfurization process in offshore platform. The sloshing experiment of bubble column was carried out by using the self-built sloshing experiment device. Using CFD numerical simulation software, the three-dimensional numerical simulation of the flow field distribution in the bubble column under sloshing condition was carried out. The results show that the bubble column has better uniform distribution performance with double main pipe cross type gas distributor. Compared with the single pipe gas distributor, the gas distribution non-uniformity is reduced by 15.76%. Under the sloshing condition, liquid level of the bubble column changes periodically, the immersion depth of the gas distributor decreases, and the liquid level fluctuation reaches 21.1% at most. The overall gas holdup decreases with the increase of sloshing angle, and the effect of sloshing can be reduced by increasing the apparent gas velocity or decreasing the level height. The gas-liquid distribution in the tower changes periodically along with sloshing, and the gas distribution non-uniformity increases, especially, in the tower section where the height diameter ratio is less than 1.5, the gas-liquid distribution is significantly affected by sloshing.