Answer / phoenix.ash1

Kal energy

Answer / ns satyaraj

Purging is flushing out unburnt fuel in flue gas path. scavenging is removal of flue gases which are still in flue gas path. It is done before lighting up the boiler for certain defined period say 300 sec with fd fan air. Also purging of burners are done to prevent choking of burners passages of fuel. Done after burners are cut out of service . There is a risk of explosion if not done mostly in oil fired boilers

In one plant id fan and fd fan are used for boiler. boiler is used to heat water after some days they install one tank to heat water by hot flue gases coming out from boiler and then hot flue gases are used to heat the air coming from fd fan before leaving out from chimney . but hot flue gases are not coming out from id fan what might be the reason?

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