Posts Tagged ‘advanced control & process automation’

Distillation Column Control Basics – Part 3

Posted in Process Optimization on Monday, February 2nd, 2015. No comments yet
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Author: Lou Heavner Part 1 in the series addressed basic distillation column control and Part 2 explored inferential composition measurement and control design. In today’s post I share how we need to consider how to close the material balance and the application of advanced process control (APC). Material Balance The level in the reflux accumulator […]

PID Control in 3-Phase Oil and Gas Separation

Posted in Oil & Gas on Tuesday, January 27th, 2015. 2 comments so far
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The PID controller entry in Wikipedia highlights the beginning of proportional+integral+derivative control going all the way back to the 19th century: PID controllers date to 1890s governor design.[2][3] PID controllers were subsequently developed in automatic ship steering. One of the earliest examples of a PID-type controller was developed by Elmer Sperry in 1911,[4] while the […]

Distillation Column Control Basics – Part 2

Posted in Process Optimization on Wednesday, January 14th, 2015. 2 comments so far
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Author: Lou Heavner In part 1, we looked at how control has been traditionally performed on distillation columns. We’ll look at some improvements in today’s post. Inferential Composition Measurement One thing required for distillation column control is product quality measurement. This is typically done with analyzers, but many columns are not equipped with online analyzers. […]

Distillation Column Control Basics – Part 1

Posted in Process Optimization, Support Services on Thursday, December 11th, 2014. 4 comments so far
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Author: Lou Heavner In this 3-part series on distillation column control basics, we’ll look at traditional control and modern approaches to improve control robustness. For background, you can find a good write up on industrial distillation in Wikipedia. In the distillation process, a feed mixture is separated by volatility or boiling point into 2 or […]

Solving Thermal Oxidizer Interacting Loops

Posted in Chemical, Process Optimization, Variability Management on Tuesday, December 2nd, 2014. 3 comments so far
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Author: Sonal Gilani In an earlier post, Improving Energy Efficiency in Thermal Oxidizers, I highlighted how switching control loops from manual to automatic mode improved overall efficiency. Emerson’s James Beall shared a second story on this thermal oxidizer equipment, which is used to destroy the waste gases containing volatile organic compounds and hazardous air pollutants […]