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Master's Dissertation
DOI
10.11606/D.3.2016.tde-31122015-101900
Document
Author
Full name
Fellipe Garcia Marques
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Garcia, Claudio (President)
Kunigk, Leo
Vianna Junior, Ardson dos Santos
Title in Portuguese
Modelagem fenomenológica e controle de uma planta piloto de neutralização de pH.
Keywords in Portuguese
Controle baseado em modelo
Dinâmica dos fluidos
Equilíbrio químico
Fluidodinâmica de reatores
Invariantes de reação
Modelagem de processos
Observador não-linear
Abstract in Portuguese
A neutralizacao de pH e utilizada nas industrias, para garantir o descarte seguro de euentes. As plantas de neutralizacao de pH sao um problema complexo de controle, visto que a planta segue um modelo nao-linear e apresenta caractersticas variantes no tempo, o que demanda sua correta modelagem para o projeto de sistemas de controle ecientes. No entanto, a teoria referente a modelagem de pH nao e facilmente aplicada na pratica, resultando frequentemente em modelos que nao predizem corretamente o comportamento dinamico da planta. O primeiro objetivo deste trabalho foi modelar matematicamente a Planta Piloto de Neutralizacao de pH do Laboratorio de Controle de Processos Industriais (LCPI), utilizando uma metodologia que possa ser aplicada para obter o modelo matematico de outras plantas de neutralizacao de pH. Inicialmente a Planta Piloto de Neutralizacao de pH do LCPI foi modelada de acordo com a abordagem fenomenologica, utilizando-se os princpios de conservacao de massa, da eletroneutralidade e os conceitos de equilbrio qumico. Em seguida, o modelo foi ajustado aos dados experimentais do processo (abordagem emprica), utilizando-se curvas de titulacao dos inuentes e distribuicoes de tempos de residencia do reator. Atraves de experimentos, vericou-se que o modelo representou, de forma satisfatoria, a dinamica real da Planta Piloto de Neutralizacao de pH do LCPI. Ademais, este modelo foi utilizado para alcancar o segundo objetivo deste trabalho: projetar um sistema de controle de pH, o qual foi composto por um observador nao-linear e um controlador baseado em modelo. Esta estrutura de controle foi testada experimentalmente, onde certicou-se que os requisitos de controle foram satisfeitos.
Title in English
Phenomenological modeling and control of a pH neutralization pilot plan.
Keywords in English
Chemical equilibrium
Model based control
Nonlinear observer
Process modeling
Reaction invariants
Reactor fuid dynamics
Abstract in English
The pH neutralization is used in industry to discard properly the wastewater, ensuring the environment preservation. The pH neutralization is a complex control problem, as the model of the plant presents a strong nonlinearity and time varying characteristics, which demands a proper modeling in order to design ecient control systems. However, the application of the theory related to pH modeling is not a trivial task and may result in models that can not predict the plant dynamics. The rst objective of this research was to model the pH Neutralization Pilot Plant, of the Laboratory of Industrial Processes Control (LCPI), using a methodology that could be replicated to model other pH neutralization plants. Initially, the pH Neutralization Pilot Plant was modeled with the phenomenological approach, utilizing rst principles, such as the mass conservation, electroneutrality and chemical equilibrium. Moreover, the model was adjusted to represent the process observed data (empirical approach), as its titration curves of the inuent streams and its reactor residence time distribution. Through experiments, it was veried that the model could represent adequately the real process dynamics. Furthermore, this model was used to achieve the second objective of this research: to design a pH control system, which was composed of a nonlinear observer and a modelbased control. This control structure was tested experimentally, ensuring that the control requirements were satised.
 
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Publishing Date
2016-01-13
 
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