Induced Draft Fan Vs Forced Draft Fan

Forced draft fans focus the pressure and volume at the outlet of the fan to push air through a system creating positive air pressure.

Induced draft fan vs forced draft fan.

Almeco s cooling tower range contains all different types. The air moving device for an air cooled heat exchanger is commonly an axial flow propeller type fan that either forces the air across the bundles forced draft or pulls it across induced draft. Id fan will handle the flue gases i e. Typically the fd fans control airflow.

They will probably always be optional methods for boiler combustion air source. In theory the primary advantage of the forced draft unit is that less power is required. Fans are located above the bundle. Id fan is basically mentioned here for induced draft fan and id fan is always located between dust collector and chimney.

To provide redundancy in case a mechanical unit falls and to provide the basic control achievable by running one fan or two a bundle or set of. The forced draft fan only sees room air. Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure. In a balanced draft boiler you actually have both.

Couple drive induced draft id fans and forced draft f d fans. All motor coupled industrial blowers fans are supplied with suitable couple set as per blower capacity. Forced draft fd fans supplying air to the furnace and induced draft id fans removing flue gas. Air is pulled across the finned tube surface.

Before they were applied to air cooled units induced or forced draft fans were applied to boilers for furnishing combustion air and they still are to this day. Induced draft air cooled heat exchangers. Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure. Id fan will take the hot flue gases from furnace via dust collector dust separation system or fume extraction system and will deliver to chimney.

It lives in a much friendlier environment and therefore may be less susceptible. Both axial and centrifugal fans can be used. It s not always either or. Industrial induced draft fans operate by focusing the pressure and volume at the inlet of the fan to pull air through a system.

I ve used the combustion air fan on boilers both ways induced or forced. This is true when the air temperature rise exceeds 54 f 30 c because the fan is pumping denser air. The induced draft fan pulls things through the furnace and then pushes them out the vent.