Question: Part of a proposed control design for a blending process is given in Figure. In addition, the composition of A is to be controlled by adjusting one or more flow set points. The objectives are to control the product flow tightly and the composition as tightly as possible; disturbances are in component compositions and changes to the product flow set point; no constraints are encountered. Critically evaluate the proposed control, make any changes to provide closed-loop flow control, and design the composition feedback control.
