The level of liquid in a reboiler on a distillation column is controlled by using feedback control to throttle a valve on the liquid product (see below P&ID). However, the pressure of vapour above the liquid in the reboiler also affects the flow rate of liquid product, as an increase in pressure above the liquid will push the liquid through the product line faster. a) Draw a cascade arrangement where the vapour pressure is measured as the secondary variable. b) Draw a cascade arrangement where the actual flowrate in the liquid product stream is measured as the secondary variable.
The level of liquid in a reboiler on a distillation column is controlled by using feedback control to throttle a valve on the liquid product (see below P&ID). However, the pressure of vapour above the liquid in the reboiler also affects the flow rate of liquid product, as an increase in pressure above the liquid will push the liquid through the product line faster. a) Draw a cascade arrangement where the vapour pressure is measured as the secondary variable. b) Draw a cascade arrangement where the actual flowrate in the liquid product stream is measured as the secondary variable.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:The level of liquid in a reboiler on a distillation column is controlled by using feedback control to throttle a
valve on the liquid product (see below P&ID). However, the pressure of vapour above the liquid in the reboiler
also affects the flow rate of liquid product, as an increase in pressure above the liquid will push the liquid
through the product line faster.
a) Draw a cascade arrangement where the vapour pressure is measured as the secondary variable.
b) Draw a cascade arrangement where the actual flowrate in the liquid product stream is measured as the
secondary variable.
Feed
LTC
vapour
liquid
Liquid product
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