洁净煤技术

2019, (04) 125-129

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散射管气体鼓泡塔流场分布特性及优化
Flow distribution characteristics and optimization of a gas bubble column in a scattering tube

何宇康;王春波;
HE Yukang,WANG Chunbo

摘要(Abstract):

鼓泡塔因其较好的气-液传质性能具有高污染物脱除效率,被广泛应用于生物化工和烟气处理等领域。鼓泡塔散射管气体分布器的几何尺寸和结构是影响相间传质效率的关键因素,优化塔内流场对于提高鼓泡塔内气-液两相间的传质效率至关重要。采用Fluent软件对有内构件散射管横向进气口式的鼓泡塔进行模拟研究,基于双流体方法和群体平衡模型(PBM)模型对鼓泡塔三维建模,采用一阶迎风差分格式离散,使用Phase Coupled Simple算法进行压力速度耦合。研究了散射管所在圆环直径d分别为0. 375D、0. 5D、0. 625D、0. 75D时(D为鼓泡塔直径),散射管进气口的布置对整体和局部气含率、液速和气泡尺寸等的影响。研究结果表明,随着散射管分布环直径的增大,整体气含率先增大后减少,平均气泡直径先减小后增大;当散射管所在圆环直径d=0. 5D时,鼓泡塔整体气含率和液相循环速度最大,平均气泡直径最小,鼓泡塔流场综合性能最好。
Bubble tower is widely used in bio-chemical industry and flue gas treatment due to the high efficiency of pollutant removal of its better gas-liquid mass transfer performance.The geometry size and structure of the gas distributor in the scattering tube are the key factors that affect the mass transfer efficiency between the two phases of gas and liquid.It is very important to optimize the flow field in the column for improving the mass transfer efficiency between gas and liquid in the bubble column.Fluent software was adopted to simulate the transverse inlet of scattering tube with internal components of bubbling tower.The three-dimensional model of bubbling tower was carried out based on the two-fluid method and population balance(PBM) model.The first-order upwind difference scheme was used to discretize the bubble column,and the Phase Coupled Simple algorithm was used for pressure and velocity coupling.The influences of the air inlet layout on the overall and local gas holdup,liquid velocity,bubble size and other factors were studied when the diameter of the ring where the scattering tube was located was equal to 0.375D,0.5D,0.625D and 0.75D,respectively.The results show that with the increase of the diameter of distribution ring,the overall gas holdup increases first and then decreases,and the average bubble diameter decreases first and then increases.When the diameter of the ring where the scattering tube is located is d=0.5D,the bubble tower has the largest overall gas holdup and liquid circulation velocity,the smallest average bubble diameter,and the best comprehensive performance of flow field in the bubble tower.

关键词(KeyWords): 散射管;鼓泡塔;气含率;液相速度;气泡直径
scattering tube;bubble tower;gas holdup;liquid velocity;air bubble diameter

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作者(Author): 何宇康;王春波;
HE Yukang,WANG Chunbo

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