In-line mixer pH system for the identification of titration curve

Seungjae Lee, Su Whan Sung, Jietae Lee

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

An in-line mixer pH system is proposed to identify the titration curve before changes in the input stream affect the main pH neutralization reactor. It is operated under integral control and shows oscillatory responses for a wide range of controller integral gain. The bifurcation diagram for the change of the controller integral gain is very similar to that of the quadratic map which is often used in illustrating the chaos phenomena of nonlinear processes. Various bifurcation diagrams are obtained as operating conditions of the in-line mixer system such as the set point of pH and components of the input stream change. The integral control keeps oscillations be around the set point, providing plentiful information about the pH process. The oscillations can be used to identify the titration curve of the input acid stream. Simulation and experimental results show that the chaotic operations of a small in-line mixer can be positively used for the identification of the titration curve.

Original languageEnglish
Pages (from-to)442-449
Number of pages8
JournalInternational Journal of Control, Automation and Systems
Volume11
Issue number3
DOIs
StatePublished - Jun 2013

Keywords

  • Chaotic operation
  • identification
  • in-line mixer
  • pH system
  • titration curve

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