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Forced Draft Fans
Forced draft fans accommodate higher process inlet temperatures, often working to push ambient air through burners to preheat air for boiler system efficiency. They can require less structural support and may offer a longer mechanical life than many induced draft fans because the cleaner ambient air is not as hard on the fan as the air often pulled through using induced draft.
As we know, for a Steam Boiler to generate steam, combustion must occur, be it any fuel (wood/coal/rice husk/pet coke/LDO/Furnace oil) and for combustion to exist one of its three main requirements, is the air. And this requirement is compensated by a Forced Draft Fan.
FD fan supplies air to the Air-preheater, where it captures the heat from the flue gases coming from the Boiler Outlet.
Nowadays, fluidized bed combustion is one of the promising ways of collecting more energy through combustion for solid fuels. But this would not have even been so famous if there was nt any Forced Draft Fan.