Open AccessJournal Article
Nonlinear pH Control Using a Three Parameter Model
Jietae Lee,Ho-Cheol Park +1 more
TL;DR: In this article, a three-parameter model of a strong acid and a weak acid with unknown dissociation constant is proposed to better control a wide class of multi-component acid streams.
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Abstract: A two parameter model of a single fictitious weak acid with unknown dissociation constant has been successfully applied to design a neutralization system for many multi-component acid streams. But there are some processes for which above two parameter model is not satisfactory due to poor approximation of the nonlinearity of pH process. Here, for better control of wide class of multi-component acid streams, a three parameter model of a strong acid and a weak acid with unknown dissociation constant is proposed. The model approximates effectively three types of largest gain variation nonlinearities. Based on this model, a nonlinear pH control system is designed. Parameters can be easily estimated since their combinations appear linearly in the model equations and nonlinear adaptive control system may also be constructed just as with the two parameter model.
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Citations
pH automation in sugar industries
V. Vijayaragavan,S. Vivek,S. Anu Aarthy,S. Raagavi,N. Saranya +4 more
- 24 Aug 2015
TL;DR: The simulation results indicates that this method has the good control effect and using this techniques a promising results towards milk of lime (MOL) flow to controlling the pH was concluded, and could be further developed using hardware based control and implemented in sugar industries to control the pH value automatically.
2
References
Nonlinear control of pH processes using the strong acid equivalent
TL;DR: In this paper, a new approach was developed for the design of nonlinear controllers for pH processes, consisting of defining an alternative equivalent control objective which is linear in the states and using a linear control law in terms of this new control objective.
160
Nonlinear inferential control
TL;DR: In this article, the authors present the structure of NLIC and the manner in which it is applied to processes when the controlled variables are measured, and the improvement in the process control using NLIC.
99
Self-tuning controllers for nonlinear systems
Mukul Agarwal,Dale E. Seborg +1 more
TL;DR: Simulation results for a stirred-tank chemical reactor demonstrate that the new nonlinear STC strategy provides significant improvement over conventional STCs based on linear models.
81
In-line process-model-based control of wastewater pH using dual base injection
TL;DR: In this article, in-line neutralization of wastewater pH is demonstrated by using a multicomponent process simulator, which includes noise, instrument lags, and six nonstationary parameters.
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