In a wall fired boiler when a flame
scanner sense no flame, the respective burner shut-off valves are demanded to
close. If they are failed to close after 10 sec. it is announced as Partial
Flame loss.
If the number burners are less than a
number which can cause unsafe condition, MFT will be initiated. Sometimes a
load factor less then 75% is also ANDed for MFT.
Conservatively some plants are initiating
MFT for Partial Flame loss irrespective of any condition of the boiler.
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