Modelamento, simulação e controle de um processo de neutralização de pH.

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Author(s):	Oscar Alberto Zanabria Sotomayor Total Authors: 1
Document type:	Master's Dissertation
Press:	São Paulo.
Institution:	Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
Defense date:	1997-08-29
Examining board members:	Claudio Garcia; Felipe Miguel Pait; Song Won Park
Advisor:	Claudio Garcia
Abstract
This work focuses one of the most important SISO problems of the process industry: the pH control. Firstly a brief introduction on the pH systems is presented, its several applications and characteristics that convert it into one of the most difficult to control. Then it is shown a method of reaction invariants for modeling the pH system and the model of process to be used (a mixture of HN\'O IND.3\', NaOH and NaHC\'O IND.3\'). A dynamic study of the open loop process and a stability analysis using the Lyapunov criterion is then presented. Next are development two strategies of advanced control, based on a model for the mentioned process: a self-tuning controller, with a Smith predictor (STC-TDC) and an input-output linearization controller (IOLC). Both tenchniques are compared, based on their perfomance, with a well tuned PI controller, being the best of them implemented in a pilot plant for its experimental evaluation. Finally several suggestions for future works are presented. (AU)