MODELLING OF A DISTILLATION COLUMN DURING CHANGES IN OPERATING STATE

摘要

The present invention relates to a method for determining a state of a distillation column (12) having a plurality of column stages for decomposing a feed fluid stream into individual fluid components, wherein the state is determined in dependence on pressure differences prevailing between adjacent column stages by means of a model, wherein in the model both the gaseous and the liquid flows between the adjacent column stages are also caused by the pressure differences prevailing between the adjacent column stages, whereby in the model a mass flow Ṅ _v characterizing the gaseous flow between two column stages is given by Ṅ _v · R _v = C _v · Δ p _v and the liquid flow between two column stages is characterized by the amount of substance flow Ṅ _L given by Ṅ _L ·R _L = C _L ·Δp _L , whereby, for the gaseous or liquid phase, Δp_{V, L,} a total pressure difference between the two adjacent column stages, R _{V, L is} a drag coefficient between the two adjacent column stages and C _{V, L is} a conductance of the flow between the two adjacent column stages.