Figure 7.2.ii Autoflame Draft Control
After commissioning is completed, every fuel and air position will have a stack damper position
together with a stored draft pressure. The stack pressure is controlled by air pressure sensor, stack
damper and PI loop. When the system is in run mode the stack damper will be positioned according to
the stored commissioning pressure. If the stack draft reading measured by the differential air pressure
sensor reads a different condition to the stored value, then the stack damper butterfly valve will be
adjusted to ensure that the stack pressure is brought back to its commissioned value.
Figure 7.2.iii Draft Control Schematic
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