Both ID fan and FD fan are basically centrifugal air blowers Or inversely speaking, A Centrifugal Air Blower is called ID Fan or FD Fan based on its use. FD Fan pushes the air into the system. The system may be furnace/ boiler/ etc. In furnace & boilers FD Fan sucks the fresh air from atmosphere and supplies it to the burner for combustion. FD ...

ID Fan capacity taking 20% margin on flow = 25.7 x 1.2 = 30 m3/s ID Fan static Head = Draft Loss in (Boiler + Duct + Dust collector) = 150 + 50 + 50 mm WC : Approximate = 250 mmWC Taking 20% margin on head, ID Fan head = 250 * 1.2 = 300 mm WC Power requirements of ID Fan : Let us assume Fan efficiency as 75% and Motor Efficiency as 90%.

answer / vellaisamy. if id fan on boiler not functioning, furnace pressure will raise and bypass damper will open immediately asper the boiler's safety interlock execution.so that, the boiler will be safe, where as boiler efficiency will be low because of no heat exchanging in the combustion air and furnace draft also will not perfect.hence boiler can run without id fan with low load.

actually suction of ID fan is in negative.. in boiler furnce draught maintain (-3mmwc to -5mmwc) with the help of ID fan.ie it's create vaccum in boiler side.. and it's discharge goes to stack which is positive..

ID is "Induced Draft" and FD is "Forced Draft." In an induced draft system, the fan is at the exit end of the path of flow, and the system is under negative pressure - that is, the pressure in the flow area is below atmospheric, because the air is being drawn through the fan. In a forced draft system the fan is at the entry end of the path of flow.

How do i perform grounding of star point of Genset (400V) for making connection with step up transformer of DELTA-DELTA (400V to 20KV) ? while Genset itself has its own neutral and grounding bus bar inside genset breaker box whereas we have another neutral and grounding busbar in synchronizing panel next to genset at maximum distance of 6meter, would someone pls advice if we can only perform ...

At normal condition ID fan discharge pressure is at 0-25mmWC. But due to chimney stack effect ID fan discharge pressure may be slightly negative

Answer / viraf b. karanjawala. the probable causes of boiler backfire are 1) outlet damper partially/fully closed, 2) Improper tuning of the burner 3)

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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