The purpose of boiler in thermal power plants is to covert water into steam with the help of heat energy generated by the combustion of fuels like coal Cheap New England Patriots Jersey , wood, oil or natural gas. Boiler systems use several types of fans to maintain air flow, recirculate air and remove exhaust gases. Based on the boiler size and air flow requirement different fans are used with varied capabilities.

Predominantly Cheap Minnesota Vikings Jersey , draft fans play an important role in thermal power plants because they regulate the air pressure inside boiler system. Draft fans are broadly divided into two types – Forced Draft (FD Fan) and Induced Draft (ID Fan). Apart from the draft fans, there are also other basic types of process fans used in power plants. They are primary air fans and flue gas recirculation fans.

Draft Fans

The primary difference between a forced draft and induced draft is, FD fan forces outside air into the heating system whereas ID fan draws flue gases from the system out into the atmosphere. Both FD fan & ID fan operate in such a way that it balances the air system in the boiler to make the combustion process efficient.

Forced Draft Fan

* FD fan or forced draft fan Cheap Miami Dolphins Jersey , draws air from the atmosphere and forces it into the furnace through a preheater. These fans are located at the inlet of the boiler to push high pressure fresh air into combustion chamber, where it mixes with the fuel to produce positive pressure.The most common centrifugal fans used as FD fans are backward curved and airfoil centrifugal fans.

* In power plants, where coal is used as fuel for combustion Cheap Los Angeles Rams Jersey , FD fans are used as secondary air fans to regulate proper combustion and maximize efficiency of the fuel.

* A typical FD fan arrangement uses inlet and outlet dampers to control and maintain the required air pressure inside the system. These fans have a wheel at the center that is hung on the shaft along with inlet boxes, silencer, filter and rain hood.

* When compared to ID fans Cheap Los Angeles Chargers Jersey , FD fans are easier to maintain and have cleaner operating conditions.