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Calculation method for the response time to step inputs for approximate dynamic models of distillation columns
Author(s) -
Weigand W. A.,
Jhawar A. K.,
Williams T. J.
Publication year - 1972
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690180623
Subject(s) - distillation , range (aeronautics) , fractionating column , nonlinear system , degree (music) , response time , transient (computer programming) , steady state (chemistry) , computer science , transient response , control theory (sociology) , mathematics , engineering , chemistry , chromatography , control (management) , artificial intelligence , physics , computer graphics (images) , electrical engineering , quantum mechanics , acoustics , aerospace engineering , operating system
A calculation method to determine the response time to be used for approximate mathematical models is developed for the dynamic behavior of distillation columns. Previous work has shown that the concept of Inventory time can be successfully used to approximate the response time, that is, the 60% point of the step response, of distillation columns operating at a high degree of separation. A modified version of the inventory time method, based on the minimum change of storage, has been developed to predict the response time for other ranges of separation within reasonable bounds of error, ± 10%. Only steady state and design data were used. A rigorous nonlinear simulation generates the steady state and transient data upon which the approximate models are based. While the modified inventory time method developed cannot handle every possible operating condition with the desired degree of accuracy, it has been shown to apply over a much wider range of operating conditions than the original inventory time method.