Step 1: Establish control objectives
Assess the steady-state design and dynamic control objectives for the
process.
This is probably the most important aspect of the problem because
different control objectives lead to different control structures. There
is an old Persian saying l'If you don't.know where you are going, any
road will get you there!" This is certainly true in plantwide control.
The "best" control structure for a plant depends upon the design and
control criteria established.
These objectives include reactor and separation yields, product quality specifications, product grades and demand determination, environmental
restrictions, and the range of safe operating conditions.