M9.1. Background
Virtually every manufacturing plant has a steam utility system. The heart of the steam system is the boiler (in general, there are a number of boilers in a plant). One of the important control loops on a steam boiler is the steam drum level controller, which is shown schematically in Figure M9-1. An actual boiler control problem consists of many other control loops, including steam pressure control.
Figure M9-1. Control instrumentation diagram for boiler level.
The control of steam drum level is tougher than most other level control problems because there is inverse response combined with a ramp in the level when a step increase ...
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