The distillation in Figure 1 shown on the next page is used for the distillation of a binary mixture. Symbols x, y, z indicate molar fractions of the more volatile components, B, D, R, and F molar flow rates. It is desirable to control the distillate composition y against disturbing agents in the feed flow rate F. All flow rates can be measured and adjusted, except for F which can only be measured. A concentration analyzer can measure the y-value. (a) Propose a feedback control method and draw its schematic diagram. (b) Propose a feed-forward control method and draw its schematic diagram. (Draw two separate diagrams for each option. Show the locations of the transmitters and controllers.
The distillation in Figure 1 shown on the next page is used for the distillation of a binary mixture. Symbols x, y, z indicate molar fractions of the more volatile components, B, D, R, and F molar flow rates. It is desirable to control the distillate composition y against disturbing agents in the feed flow rate F. All flow rates can be measured and adjusted, except for F which can only be measured. A concentration analyzer can measure the y-value.
(a) Propose a feedback control method and draw its schematic diagram.
(b) Propose a feed-forward control method and draw its schematic diagram.
(Draw two separate diagrams for each option. Show the locations of the transmitters and controllers.
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