Solution Found!
The distillation column shown in the drawing is used to
Chapter 1, Problem 1.6(choose chapter or problem)
The distillation column shown in the drawing is used to distill a binary mixture. Symbols x, y, and z denote mole fractions of the more volatile component, while B, D, R, and F represent molar flow rates. It is desired to control distillate composition y despite disturbances in feed flow rate F. All flow rates can be measured and manipulated with the exception of F, which can only be measured. A composition analyzer provides measurements of y. (a) Propose a feedback control method and sketch the schematic diagram. (b) Suggest a feedforward control method and sketch the schematic diagram.
Questions & Answers
QUESTION:
The distillation column shown in the drawing is used to distill a binary mixture. Symbols x, y, and z denote mole fractions of the more volatile component, while B, D, R, and F represent molar flow rates. It is desired to control distillate composition y despite disturbances in feed flow rate F. All flow rates can be measured and manipulated with the exception of F, which can only be measured. A composition analyzer provides measurements of y. (a) Propose a feedback control method and sketch the schematic diagram. (b) Suggest a feedforward control method and sketch the schematic diagram.
ANSWER:Problem 1.6
The distillation column shown in the drawing is used to distill a binary mixture. Symbols x, y, and z denote mole fractions of the more volatile component, while B, D, R, and F represent molar flow rates. It is desired to control distillate composition y despite disturbances in feed flow rate F. All flow rates can be measured and manipulated with the exception of F, which can only be measured. A composition analyzer provides measurements of y.
(a) Propose a feedback control method and sketch the schematic diagram.
(b) Suggest a feedforward control method and sketch the schematic diagram.
Step by Step Solution
Step 1 of 4
(a)
The sketch of the schematic in accordance with the specified conditions can be obtained as follows:
From the diagrammatical representation shown in Figure 1, the direction from the column to the respective side is shown in accordance with the AT (analyzer or transmitter) and AC (composition or the analysis controller).
The molar flow rate B, x can be seen at the bottom of the column and goes again on to the column for the specified conditions.
