December 2002
Intermediate to advanced
800 pages
18h 7m
English
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15.7. Summary
This chapter has provided a brief overview of perhaps the most interesting and challenging aspects of process control. The intuitive placement of controllers on a process with recycle can often lead to extreme sensitivity to disturbances known as the snowball effect. This effect can be minimized by fixing the flow rate of one stream in the recycle loop.
Recycle can also significantly increase the dynamic timescale of the process. The specification of a plantwide control structure is based on years of operational experience with similar plants and will involve input from a large number of engineers and technicians. If you are interested in a much more detailed presentation of plantwide control, including many “rules of thumb” and ...
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