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Extra resources for Chemical Engineering. Essentials of Process Control
5. Stability: A process is said to be unstable if its output becomes larger and larger (either positively or negatively) as time increases. Examples are shown in Fig. 15. ” A linear process is right at the limit of stability if it oscillates, even when undisturbed, and the amplitude of the oscillations does not decay. , stable with no controllers on the system. One important and very interesting exception that we will study in some detail is the exothermic chemical reactor, which can be openloop unstable.
The steady-state economically optimal plant may be much more difficult to control than an alternative plant that is perhaps only slightly more expensive to build and operate. At this level, the economic impact of a good process control engineer can be enormous, potentially resulting in the difference between a profitable process and an economic disaster. Several cases have been reported where the process was so inoperable that it had to be shut down and the equipment sold to the junk man. Chapters 5 and 6 discuss this vitally important aspect in more detail.
Thus, we begin to take corrective action as soon as a disturbance entering the system is detected instead of waiting CHAPTER I: introduction 21 Disturbance Manipulated variable I I Measurement device . 14 Feedforward control. (as we do with feedback control) for the disturbance to propagate all the way through the process before a correction is made. 5. Stability: A process is said to be unstable if its output becomes larger and larger (either positively or negatively) as time increases. Examples are shown in Fig.