An Input to State Stability Approach for Evaluation of Nonlinear Control Loops with Linear Plant Model

2018 ◽  
pp. 144-154 ◽  
Author(s):  
Peter Benes ◽  
Ivo Bukovsky
Keyword(s):  
Nonlinear Control ◽  
Plant Model ◽  
Control Loops ◽  
Linear Plant

Improved methodology and set-point design for diagnosis of model-plant mismatch in control loops using plant-model ratio

2014 ◽  
Vol 24 (11) ◽  
pp. 1720-1732 ◽  
Author(s):  
Sehej Kaw ◽  
Arun K. Tangirala ◽  
Alireza Karimi
Keyword(s):  
Plant Model ◽  
Set Point ◽  
Control Loops ◽  
Model Plant

Beam switching by nonlinear control of total internal reflection

1998 ◽  
Vol 45 (1) ◽  
pp. 179-192
Author(s):  
DAVID R. ROWLAND, WAGDY SAMIR, ROWLAND A.
Keyword(s):  
Nonlinear Control ◽  
Total Internal Reflection ◽  
Internal Reflection ◽  
Beam Switching

There Reduction of alkali loss in an ash leaching system

TAPPI Journal ◽  
2017 ◽  
Vol 16 (7) ◽  
pp. 383-391
Author(s):  
CARLA CÉLIA ROSA MEDEIROS ◽  
FLÁVIA AZEVEDO SILVA ◽  
SAULO GODOY PIGNATON ◽  
ESTANISLAU VICTOR ZUTAUTAS ◽  
KLEVERSON FIGUEIREDO
Keyword(s):  
Solid Waste ◽  
Air Emissions ◽  
Recovery Cycle ◽  
Chloride Level ◽  
Control Loops ◽  
Kraft Mill ◽  
Recovery Boiler ◽  
Ash Leaching

There are many points in a kraft mill where the alkaline compounds are purged from the process. Several effluents, solid waste, and air emissions contain alkali, which leads to the necessity of chemical makeups to maintain the liquor balance. The main loss of alkali at the Veracel mill is present in the wastewater from the recovery boiler; more precisely, it is from the ash leaching system, which represents 80% of the total losses. To minimize the alkaline losses while keeping the chloride level in the recovery cycle under control, a project was developed at Veracel. Key actions were taken by adjusting the control loops of the ash leaching system, mainly on the slurry density and purge control. These adjustments led to a decrease in alkali losses and to an increase of treated ash, and kept the chloride level of the recovery boiler dust at 2.6%.

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