The flow of gases through a boiler can be achieved by creating draught in the following two methods
Natural draught
Mechanised draught
Mechanised draught can be of three type again
a. forced draught system
b. induced draught system
c. balanced draught system
Induced draught system
(I.D. fan) Steam turbine or electric motor driven fan which develops negative draft within the boiler to pull the hot exhaust gases through the boiler. This results in a furnace pressure lower than atmosphere and effects the flow of air. Due to this air can be drawn into the boiler setting through any opening.
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