Question: The mixing process in Figure involves a tank to mix components A and B without chemical reaction. The effluent from the mixing tank is blended with a stream of component C, and the flow of this stream is wild; that is, it cannot be adjusted by this control strategy. Note that waste is to be minimized.
(a) Using only the equipment shown in the figure, design a control system to tightly control the percentages of A, B, and C in the blended product. Can you achieve this and also control the total flow of blended product?
(b) Improve your result in (a) by adding an analyzer that can measure compositions in one stream. Decide the proper location and use it in the control system. Discuss why the analyzer would improve the performance.