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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Answer Posted / ns satyaraj
Flue gases are not coming out of Id fan means flue gases has become heavier than atmospheric air. Reason s can be Id inlet is closed .2 temp of flue gas is very low as it has given out it's temp to water and air from fd .3 flue gas temp at boiler out is in enough high due to poor combustion
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