| Process Control |
4. Motivation for Process Control
4.1 Main control objectives
- Personal and operational safety
- Adaptability to external changes
- Operational stability
- Product specification
- Reduced environmental impact
- Adapting to inherent restrictions (equipment materials/ etc.)
- Optimization
- Process economics
4.2 Economics of Process Control
A reliable control system makes it possible to operate close to the limits
imposed by safety, by the environment or by the process (such as maximum
temperature, minimum reactant purity). Compared to a poor control strategy
(dashed line in the picture below), a good control strategy allows the operator
to move the operating conditions closer to the limits (continuous line), which
often leads to a better economical result, less material losses, etc.
5.
Luyben's Laws
The textbook author proposes two basiclaws for those willing to learn
Process Control.
First Law: "The simplest control system that will do the job is the best".
Second Law: "You must understand the process before you can control it".
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