摘要
In this paper, the measurement of liquid mixing in a downcomer of segmental type of distillation column is presented. The extent of liquid mixing is calculated by means of a mixing pool model. The results indicate that liquid mixing in a downcomer is actually incomplete. It is a significant correction to the assumption of complete downcomer mixing or no downcomer mixing which is generally adopted in many distillation calculations. Besides, the present results are used in a two dimensional eddy diffusion model to calculate the distillation tray efficiency. It is shown that the assumption of complete downcomer mixing is closer to the actual situation than that of no downcomer mixing.
对板式塔降液管内液体的混合进行测定，并用混合池模型对液体的混合程度进行计算．结果表明，降液管内液体实际处于不完全混合状态，这对目前板式塔模拟计算中普遍采用的降液管完全混合和完全不混合的假定是一个有意义的修正．进一步把这一结果应用到二维涡流扩散模型中，对塔板效率进行了计算，结果进一步表明，降液管完全混合的假定较完全不混合的假定更接近实际情况．
