Abstract
To column control, in contrast to column design, tray hold-up and dependencies of tray hold-up on the operating conditions play an important role. The essence of this article is the development of an improved model of tray hydraulics over a broad operating range and its experimental validation by means of batch distillation. First, the column dynamics are related to tray column design parameters and operating conditions. The model parameters are fitted by column residence time measurements. Two tray load regimes are distinguished: an aeration regime and an obstruction regime. At low column load a vapour increase will decrease the tray mass since the liquid is driven out by larger aeration. At high load the opposite is the case, since the liquid is driven up by stowage. The resulting dynamic behaviour is studied by linearising the rigorous tray model in an operating point. Especially the influence of the vapour flow on the column dynamics is investigated. For the influence of the tray composition change on the molar mass, a new composition-shift parameter κ is defined. The influence appeared to be small.
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