|F.D. Fans||Forced Draft Fan|
|Backward curved blades||Blower|
|Air Blowers||Centrifugal Fans|
|Fan Impeller||Blower Impeller|
|Capacity:||100 m3/hr - 400000 m3/hr|
|Motor HP:0.25 HP||700 HP|
|Pressure: 25 MMWg||1500 MMWG|
|Weight: Upto||15000 KG|
What is Forced Draft Cooler?
The Forced Draft Cooler is tubular convective type Heat Exchanger used for cooling of hot gases.In Sponge Iron Plants the kiln outlet gases are at approx. 900 to 950 °C. These flue gases cannot be let out to atmosphere as it is and are to be de-dusting. Hence, it is mandatory to provide Dust Collecting system. The major problem of providing the Dust Collecting System is the temperature of the flue gases and it becomes necessary to cool the kiln exhaust gases to around 180 to 220 °C.
The best way to accomplish this task is to have air to gas heat exchanger. Although dilution with ambient air / water spray etc. are available for the heat exchanger. Air to gas force draft heat exchanger are the simple, economical & best suited system.
Forced Draft Cooler - System Description
The air to gas Cooler is a tubular heat exchanger where, the hot kiln exhaust gases are made to pass over the tubes and cold atmospheric Air is made to pass through the tubes.This system saves considerable energy due to lower pressure drop. Also the cleaning of the FD Cooler is easy as the dusty air is made to pass over the tubes. Since there is practically no moving parts in the system and the design is a modular construction, it is easy to install, and economical and easy to maintain. This system is designed for 24 x 7 operations.
Forced Draft Cooler – Advantages
Forced Draft Cooler – Design Basis
Forced Draft Cooler Graph