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填料塔以压降小、通量大、持液量小、分离效率高等优点广泛应用于精馏和吸收等单元操作中。填料塔中液体的流体力学行为对精馏等传质过程有重要影响,而液体在填料塔中的有效流速是液体流体力学行为的重要参数。例如描述填料塔中液相返混通常用一维或二维扩散模型,其中的有效流速就是重要的方程参数;要精确描述填料塔中相界面的传质行为,液相的真实流速也是关键性的参数。目前一般采用Bravo提出的公式来计算规整填料塔内液体的有效速度
Packed tower to small pressure drop, large flux, liquid holding capacity, high separation efficiency advantages are widely used in distillation and absorption unit operation. The hydrodynamic behavior of the liquid in the packed column has an important influence on the mass transfer process, such as rectification. The effective flow rate of the liquid in the packed column is an important parameter of the hydrodynamic behavior of the liquid. For example, to describe the liquid phase backmixing in packed columns, one-dimensional or two-dimensional diffusion models are usually used, of which the effective flow rate is an important parameter of the equation. To accurately describe the mass transfer behavior of the phase interface in the packed column, the true flow velocity of the liquid phase is also critical The parameters. At present, the formula proposed by Bravo is generally used to calculate the effective velocity of the liquid in the structured packing tower