Flame Failure means that the monitoring system did not detect a stable flame when it should have. It can happen during startup or operation and has many potential causes.
Gas supply problem
Low pressure, unstable regulation, or a valve that does not open correctly can lead to a weak or unstable flame.
Combustion air problem
Excessive or insufficient air can make ignition difficult or destabilize the flame. The damper position and actual air supply should be checked.
Electrode or flame sensor
Contamination, incorrect positioning, a worn cable, or poor grounding can reduce the detection signal.
UV scanner or ionization
Depending on the system type, the signal intensity and proper line-of-sight with the flame should be checked. In ionization systems, the quality of the grounding is also important.
Flame instability
If the alarm occurs only at a specific load, the air-gas curve, pressure, and position of the servomotors should be examined.
Diagnosis
Useful information includes the timing of the trip, the load, the pressures, and the flame signal just before the shutdown.
