This video describe Causes for Flame Failure in a Boiler and Operator Action

Flame failure in a boiler can be due to many reasons.
The specific causes

1-Heavy oil or warm-up oil trip valve closing
2-Sudden reduction in mill feeder speed to a minimum
3-Loss of ignition energy
4-Flame scanner trip due to poor and unstable flame
5-Malfunctioning of flame scanner
6-Scanner air fan trip and slag build-up
7-Sudden coal hang-up in one or more mills
8-Coal feeder trip
9-Electrical supply failure
10-Air flow below 30% of total air flow
11-Tripping of all forced draft air fan
12-Tripping of all induced draft air fan
13-Very high furnace pressure

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