Pressurized Cooldown of Cryogenic Transfer Lines

1960 ◽  
pp. 378-394 ◽  
Author(s):  
J. C. Burke ◽  
W. R. Byrnes ◽  
A. H. Post ◽  
F. E. Ruccia
Keyword(s):  
Transfer Lines

Use of vent stack temperature as a feedforward variable for dissolver total titratable alkali (TTA) control

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 261-269
Author(s):  
Wei Ren ◽  
Brennan Dubord ◽  
Jason Johnson ◽  
Bruce Allison
Keyword(s):  
Feedback Control ◽  
Current Practice ◽  
Feedforward Control ◽  
Control Variable ◽  
Indirect Measurement ◽  
Tight Control ◽  
Transfer Lines ◽  
Green Liquor ◽  
Process Dynamics ◽  
Downstream Processes

Tight control of raw green liquor total titratable alkali (TTA) may be considered an important first step towards improving the overall economic performance of the causticizing process. Dissolving tank control is made difficult by the fact that the unknown smelt flow is highly variable and subject to runoff. High TTA variability negatively impacts operational costs through increased scaling in the dissolver and transfer lines, increased deadload in the liquor cycle, under- and over-liming, increased energy consumption, and increased maintenance. Current practice is to use feedback control to regulate the TTA to a target value through manipulation of weak wash flow while simultaneously keeping dissolver density within acceptable limits. Unfortunately, the amount of variability reduction that can be achieved by feedback control alone is fundamentally limited by the process dynamics. One way to improve upon the situation would be to measure the smelt flow and use it as a feedforward control variable. Direct measurement of smelt flow is not yet possible. The use of an indirect measurement, the dissolver vent stack temperature, is investigated in this paper as a surrogate feedforward variable for dissolving tank TTA control. Mill trials indicate that significant variability reduction in the raw green liquor TTA is possible and that the control improvements carry through to the downstream processes.

A reactive GRASP and Path Relinking for balancing reconfigurable transfer lines

2012 ◽  
Vol 50 (18) ◽  
pp. 5213-5238 ◽  
Author(s):  
Mohamed Essafi ◽  
Xavier Delorme ◽  
Alexandre Dolgui
Keyword(s):  
Path Relinking ◽  
Transfer Lines

scholarly journals Magnet Power Supply Control, of the NSLS VUV and X-Ray Storage Rings, Transfer Lines

1985 ◽  
Vol 32 (5) ◽  
pp. 2020-2022
Author(s):  
J. D. Klein ◽  
S. Ramamoorthy ◽  
O. Singh ◽  
J. D. Smith
Keyword(s):  
Power Supply ◽  
Storage Rings ◽  
Transfer Lines ◽  
X Ray

On the variance of the production output of transfer lines

1999 ◽  
Vol 15 (1) ◽  
pp. 33-43 ◽  
Author(s):  
P. Ciprut ◽  
M.-O. Hongler ◽  
Y. Salama
Keyword(s):  
Transfer Lines ◽  
Production Output
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