What are the causes of boiler backfire and steps in how to
prevent it from happening?
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Answer / viraf b. karanjawala
the probable causes of boiler backfire are 1) outlet damper
partially/fully closed, 2) Improper tuning of the burner 3)
accumulation of combustible gases in pockets with in the
furnace 4) accumulation of unburnt fuel left in the furnace
5) purging time before and after burner shut off not enough
i.e. too short, 6) vol of the gases against vol provided by
the boiler manufacturer
| Is This Answer Correct ? | 53 Yes | 7 No |
Answer / jose thomas
1. Unburnt fuel leftover in the furnace during previous
operation.
2. Fuel leak to the furnace before ignition.
3. Presence of flue gases in furnace.
4. Pre-purge and post-purge timings are not enough.
5. Incorrect burner settings.
6. Improper ratio of fuel and air volume.
7. Burner malfunctioning /Controller malfunctioning.
8. Outlet damper less opened.
| Is This Answer Correct ? | 35 Yes | 0 No |
Answer / m.abbas
1-Unburnt fuel accumulation in the furnace
2-Repeated unsuccessful strat attempts for boiler firing
3-Burner malfunction and air fuel ratio disturbance
4-Inadequate pre and post purging
5-Flue gases outlet damper malfunction
| Is This Answer Correct ? | 27 Yes | 3 No |
Answer / salai jeyaveeran
the basic thing for backfire in a boiler is occurance of
positive pressure in a furnace (or) boiler this can be
happend due to
high flow from FD
partial open in ID damper
low RPM of ID fan
punture of tubes
| Is This Answer Correct ? | 19 Yes | 7 No |
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