Question: The preliminary process designs have been prepared for the systems in Figure. The key variables to be controlled for the systems are
(a) flow rate, temperature, composition, and pressure for the flash system and
(b) composition, temperature, and liquid level for the continuous-flow stirredtank chemical reactor. For both processes, disturbances occur in the feed temperature and composition. Answer the following questions for both processes.
(i) Determine which sensors and final elements are required so that the important variables can be controlled. Sketch them on the figure where they should be located.
(ii) Describe how the equipment capacities should be determined.
(c) Select controller pairings; that is, select which measured variable should be controlled by adjusting which manipulated variable. (These examples will be reconsidered after quantitative methods have been introduced.)
