双切向环流气体分布器结构优化的研究

Study on structural optimization of twin-tangential annular flow gas distributor

双切向环流气体分布器性能的优劣与导流板和套筒结构的密切相关。优化导流板和套筒结构可强化双切向环流气体分布器的稳流性能,改善塔内流场分布。文中利用CFD软件采用k-ε湍流模型,对分布器内不同环形通道宽度下的流场分布进行了数值模拟。考察了套筒与塔壁的间距L变化对分布器性能的影响,并得出了在既定塔径下分布器性能达到最优时L的尺寸。通过模拟不同导流板数目和结构下塔内的流场分布,考察了分布器性能随导流板数目、轴向及径向倾角的变化趋势。分析得出使分布器压降最小,流场分布最优时挡板的结构参数。为工程设计时预测分布器的速度场及能量耗散提供参考。

The efficiency of twin-tangential annular flow gas distributor was determined by structures of baffles and sleeves. The performance of a twin-tangential annular flow gas distributor can be enhanced by optimizing structures of baffles and sleeves. The flow field in a twin-tangential annular flow gas distributor was simulated based on the standard k-ε turbulent model with CFD software according to variational distance L between sleeve and column wall. The optimal length L was obtained at the fixing column dimension. The number and structure of baffles were also researched for improving the distribution of the flow fields. The result indicates that the reasonable number of baffles, rational axes and radial obliquity can reduce pressure drop and promote the performance of distributor. The study will guide the project designing process when forecasting the flow domain and energy dissipation of the distributor.