Draught
Systems
The draught is one of the most essential systems of thermal power plant. The purpose of draught is to supply required quantity of air for combustion and remove the burnt products from the system. To move the air through the fuel bed and to produce a flow of hot gases through the boiler, economizer. Pre heater and chimney requires a difference of pressure equal to that necessary to accelerate the burnt gases to their final velocity and to overcome the pressure losses equivalent to pressure. head. This difference of pressure required to maintain the constant flow of air and to discharge the gases through the chimney to atmosphere is known as draught
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