Separation Performance of Structured Packed Columns: a Comparison of Two Modelling Approaches
نویسنده
چکیده
INTRODUCTION Structured packings of the corrugated sheet type have become increasingly popular for the application in distillation and absorption columns, due to their very good performance characteristics. Commonly, at suband near-atmospheric pressures, structured packings outperform random packings and trays in capacity and/or separation efficiency (see, e.g., Kurtz et al., 1991; Brunazzi, E. and Paglianti, A., 1997). However, these packings are quite expensive, and hence, accurate equipment design is particularly important for the minimisation of investment and operating costs. Such design cannot be realised without sound and predictive process models. It is widely known, that structured packing performance characteristics depend heavily on the corrugation geometry. Notwithstanding great efforts invested over the last 40 years in studies and modelling of the hydrodynamics and mass transfer in structured packings, determination of the optimal corrugation geometry for a particular separation task is still accomplished mostly by trial-and-error and remains rather art and knowhow than rigorous science (see, e.g., Irwin et al., 2004). This explains the large number of packing modifications and the lack of truly predictive models for their performance.
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تاریخ انتشار 2006