Control of distillation columns with sharp temperature profiles

AIChE Journal ◽  
1971 ◽  
Vol 17 (3) ◽  
pp. 713-718 ◽  
Author(s):  
W. L. Luyben
Keyword(s):  
Temperature Profiles ◽  
Distillation Columns

Instrumentation and Control of Distillation Columns with Sharp Temperature Profiles

1976 ◽  
Vol 9 (1) ◽  
pp. 26-32
Author(s):  
J. P. Bentley
Keyword(s):  
Notch Filter ◽  
Temperature Profiles ◽  
Control Loop ◽  
Dynamic Compensation ◽  
Relative Volatility ◽  
Function Generator ◽  
Distillation Columns ◽  
Optimal Linear Combination ◽  
Optimal Linear ◽  
And Control

Distillation columns separating components of high relative volatility are characterised by sharp temperature profiles and a highly non-linear relationship between temperature and reboil rate. This paper presents a stability analysis of the problem in a typical case which shows that both linearisation and dynamic compensation techniques are necessary to prevent limit cycling. Linearisation using an optimal linear combination of temperatures on different trays is compared with that of a diode function generator. The dynamic compensation of a band notch filter is compared with that of a standard three-term controller. The paper concludes that a diode function generator should be tried first and if limit cycling still persists, then a band notch filter should also be introduced into the control loop.

Tire Bead Overheating in Urban Buses and Trucks Using Drum Brake Systems

1998 ◽  
Vol 26 (1) ◽  
pp. 51-62
Author(s):  
A. L. A. Costa ◽  
M. Natalini ◽  
M. F. Inglese ◽  
O. A. M. Xavier
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Energy ◽  
Structural Integrity ◽  
Experimental Temperature ◽  
Temperature Profiles ◽  
Element Analysis ◽  
Drum Brake ◽  
Fea Model

Abstract Because the structural integrity of brake systems and tires can be related to the temperature, this work proposes a transient heat transfer finite element analysis (FEA) model to study the overheating in drum brake systems used in trucks and urban buses. To understand the mechanics of overheating, some constructive variants have been modeled regarding the assemblage: brake, rims, and tires. The model simultaneously studies the thermal energy generated by brakes and tires and how the heat is transferred and dissipated by conduction, convection, and radiation. The simulated FEA data and the experimental temperature profiles measured with thermocouples have been compared giving good correlation.

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