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?

Answer Posted / dhankhandhar@ymail.com

before chimney there is RAPH (Roatery air pre heater).so flue gas will pass from half the part of RAPH, and other half part is passing air coming from FD fan.So heat exchanges flue gas to FD fan discharge air .After that RAPH discharge is going to ID fan suction,thats how we are getting low temperature flue gas from ID fan.

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