static mixing + flow control: ratio control, linearization and relation to mutiloop/decoupling

Antonio Sala, UPV

Difficulty: ***** ,       Relevance: ,      Duration: 14:13

*Enlace a Spanish version

Summary:

This video is queued for publication at a later date; please return in a few days or subscribe.

This video continues the model-based theoretical analysis of static mixing at the inlet of a 2-tank process, which began in the video [mzrgaEN]. There, we modelled and linearized the static mixing stage, and derived the recommended pairing for multi-loop control based on the relative gain array (RGA).

Here, we discuss the ratio control strategy for the concentration loop, starting with a merely intuitive justification (similar to the model-free argumentation made in the video [estrx2bEN]). But the main objective of this video is the theoretical analysis of said ratio control, specifically its linearization: it can be observed that the linearization of the ratio control can be understood as a multi-loop + decoupling (inverse form) of the effect of the level loop on the concentration one. With this interpretation, it is justified that the multi-loop concentration control would be obtained from the ratio control one just by multiplying it by the nominal water flow.

The relationship with decoupling is discussed in more depth in the video [mzratdc2EN], the sequel to this one whose watching is recommended.

*Link to my [ whole collection] of videos in English. Link to larger [ Colección completa] in Spanish.