Combined balance control structure for distillation columns

1991 ◽  
Vol 30 (9) ◽  
pp. 2159-2168 ◽  
Author(s):  
Dae R. Yang ◽  
Dale E. Seborg ◽  
Duncan A. Mellichamp
Keyword(s):  
Control Structure ◽  
Balance Control ◽  
Distillation Columns

Design of multi-loop control systems for distillation columns: review of past and recent mathematical tools

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Changsoo Kim ◽  
Manas Shah ◽  
Ali M. Sahlodin
Keyword(s):  
Control Structure ◽  
Principal Component Regression ◽  
Principal Component ◽  
Structure Design ◽  
Machine Learning Techniques ◽  
Support Vector ◽  
Least Squares Regression ◽  
Loop Control ◽  
Distillation Columns ◽  
Inferential Control

Abstract Design of a control structure in distillation columns involves selecting proper sets of manipulated and controlled variables (often including tray temperatures for inferential control of product compositions) and one-to-one pairing between the two sets. In this paper, various mathematical tools for achieving this goal are reviewed. First, traditional methods such as Singular Value Decomposition (SVD) and Relative Gain Array (RGA) that build upon a simplified steady-state or dynamic model of the column are explored. The role of optimization in systematizing the control design procedures is also investigated. Then, more recent inferential control techniques that rely on statistical methods such as Principal Component Regression (PCR), Partial Least Squares Regression (PLSR), and other machine learning techniques such as Artificial Neural Networks (ANN) and Support Vector Machine Regression (SVMR) are discussed extensively. The discussions include newer distillation technologies with complex configurations such as dividing-wall columns. Finally, the use of process simulators in aiding the control structure design of distillation columns is surveyed.

A stable control structure for binary distillation columns

1997 ◽  
Vol 67 (4) ◽  
pp. 475-506 ◽  
Author(s):  
F. Viel ◽  
E. Busvelle ◽  
J. P. Gauthier
Keyword(s):  
Control Structure ◽  
Distillation Columns ◽  
Stable Control

Two-Point Temperature Control Structure and Algorithm Design for Binary Distillation Columns

2005 ◽  
Vol 44 (1) ◽  
pp. 142-152 ◽  
Author(s):  
Eduardo Castellanos-Sahagún ◽  
José Alvarez-Ramírez ◽  
Jesús Alvarez
Keyword(s):  
Temperature Control ◽  
Control Structure ◽  
Algorithm Design ◽  
Distillation Columns ◽  
Point Temperature

A Note on a Double Temperature-Cascade Control Strategy for Distillation Columns

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Galo R Urrea-Garcìa ◽  
Jose Alvarez-Ramirez ◽  
Guadalupe Luna-Solano ◽  
Eusebio Bolaños-Reynoso
Keyword(s):  
Control Strategy ◽  
Heat Input ◽  
Control Structure ◽  
Low Energy ◽  
Cascade Control ◽  
Energy Regulation ◽  
Feed Composition ◽  
Distillation Columns ◽  
Saturation Parameter ◽  
Simulation Results

A double temperature-cascade control strategy for controlling distillate composition is proposed. The control structure is based on two secondary loops that are designed for tracking the temperature of one tray in the rectifying and stripping section by manipulation of the reflux rate and reboiler heat input, respectively. Simulation results show that when saturations are imposed on controller outputs (reflux rate and heat input) both cascade controllers can act in a switching-like scheme without interaction problems. It is also shown that an adequate setting of a saturation parameter allows a low energy regulation of distillate composition under disturbances in feed composition.

Noise-Induced Balance Loss? Rethinking Clinical Implications of Noise Exposure

2019 ◽  
Vol 4 (6) ◽  
pp. 1418-1422
Author(s):  
Bre Myers ◽  
J. Andrew Dundas
Keyword(s):  
Vestibular System ◽  
Noise Exposure ◽  
Balance Control ◽  
Scope Of Practice ◽  
Hearing Conservation ◽  
Exposed Population ◽  
Auditory Systems ◽  
Current Article ◽  
Balance Loss ◽  
Cross System

Purpose The primary aim of the current article is to provide a brief review of the literature regarding the effects of noise exposure on the vestibular and balance control systems. Although the deleterious effects of noise on the auditory system are widely known and continue to be an active area of research, much less is known regarding the effects of noise on the peripheral vestibular system. Audiologists with working knowledge of how both systems interact and overlap are better prepared to provide comprehensive care to more patients as assessment of both the auditory and vestibular systems has been in the audiologists' scope of practice since 1992. Method A narrative review summarizes salient findings from the archival literature. Results Temporary and permanent effects on vestibular system function have been documented in multiple studies. Hearing conservation, vestibular impairment, and fall risk reduction may be more intimately related than previously considered. Conclusions A full appreciation of both the vestibular and auditory systems is necessary to address the growing and aging noise-exposed population. More cross-system studies are needed to further define the complex relationship between the auditory and vestibular systems to improve comprehensive patient care.

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