Discussion
Consider the following statements about start-up and shutdown.
1. They are inherently unsteady state operations.
2. Their analysis needs initial conditions as well as balances.
3. Steady state balances describe them adequately.
Answer: A
The first two are correct. The third is wrong, and the point matters because start-up is where a plant is at its most hazardous and steady state calculations say nothing about it. Most incidents happen away from normal operation.
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