Induced Draft Fan Vs Forced Draft Fan

Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure.

Induced draft fan vs forced draft fan.

The advantage of the forced draft fan is that the fan itself is not in the high temperature acidic environment of the exhaust gases. 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. It lives in a much friendlier environment and therefore may be less susceptible. The bearing and shaft system is same as belt drive blowers just a couple attached to the combination for shaft end and motor shaft.

Almeco s cooling tower range contains all different types. In a balanced draft boiler you actually have both. They will probably always be optional methods for boiler combustion air source. The forced draft fan only sees room air.

All motor coupled industrial blowers fans are supplied with suitable couple set as per blower capacity. 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. Forced draft fd fans supplying air to the furnace and induced draft id fans removing flue gas. Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure.

Id fan is basically mentioned here for induced draft fan and id fan is always located between dust collector and chimney. The induced draft fan pulls things through the furnace and then pushes them out the vent. I ve used the combustion air fan on boilers both ways induced or forced. It s not always either or.

In theory the primary advantage of the forced draft unit is that less power is required. This is true when the air temperature rise exceeds 54 f 30 c because the fan is pumping denser air. Couple drive induced draft id fans and forced draft f d fans. Air is pulled across the finned tube surface.

Both axial and centrifugal fans can be used. Forced draft fans focus the pressure and volume at the outlet of the fan to push air through a system creating positive air pressure. Fans are located above the bundle. Axial fans are always used for this type of draft.

Industrial induced draft fans operate by focusing the pressure and volume at the inlet of the fan to pull air through a system. Typically the fd fans control airflow. Id fan will handle the flue gases i e.