Answer / murty d

ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. It is located between dust
precipitators(ESPs) and Chimney. Obviously it handles hot
air/dust. Whereas, FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel. It
handles air at normal temperature. The capacity/power
rating of ID fan will be more than that of FD fan

Answer / azarudeen

Normally both fans are used in thermal power plant. FD fan is used to draw the air from atmosphere to boiler that will create positive pressure inside the boiler. But ID fan is used to evacuate the flue gas from boiler to atmosphere via ESP ,chimney and that will create negative pressure inside the boiler.....

Answer / m talha aziz(cap)

In a balanced draft boiler you actually have both F.d fan and I.D fan.
1. I.D stands for Induced draft Fan whereas F.D stands for Force Draft fan.
2. ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel.
3. It is located between dust precipitators(ESPs) and Chimney. Obviously it handles hot air/dust. F.D handles air at normal temperature. The capacity/power rating of ID fan will be more than that of FD fan.

Answer / virender kumar

ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. It is located between dust
precipitators(ESPs) and Chimney. Obviously it handles hot
air/dust. Whereas, FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel. It
handles air at normal temperature. The capacity/power
rating of ID fan will be more than that of FD fan

Answer / rishikesh borse

fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. It is located between dust
precipitators(ESPs) and Chimney. Obviously it handles hot
air/dust. Whereas, FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel. It
handles air at normal temperature. The capacity/power
rating of ID fan will be more than that of FD fan 

Answer / mark chen - maran engineering

More info:
The ID fan serves two functions:
1. Create a negative pressure in the furnace compared to outer pressure. if the furnace has leaks, a positive pressure in the furnace will cause gases to leak out. instead of building an expensive totally leak proof furnace, a cheaper design may be used.
2. increase the flow velocity of furnace gases. After the furnace the flue gases cool, especially when they pass various cleaning processes, so they may not reach the height in the atmosphere where they are distributed, and stay condensed above the plant site and nearby area. a high stack and increased flow velocity help here.

Answer / mark chen - maran engineering

3. ID fans also reduce the excess air, by this increasing efficiency.(Less lost heat)

Answer / mrigendra pratap singh

ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. It is located between dust
precipitators(ESPs) and Chimney. Obviously it handles hot
air/dust. Whereas, FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel. It
handles air at normal temperature. The capacity/power
rating of ID fan will be more than that of FD fan

Answer / nikhil0381

#ID Fan - Induced Draft Fan

#FD Fan - Forced Draft Fan

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 Fans are normally direct driven fans.

ID Fan pulls the air out of system. The hot flue gases such from the furnace/ boiler are sucked by ID Fan and thrown into atmosphere (via chimney). ID Fans for high temperature flue gases are belt driven fans.

For further understanding of ID Fans and FD Fans check http://www.eminentblowers.com/idfan.html

Answer / ajay singh patel

Sir fd fan and id air flow ratio is mostly same or different please succes me

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