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How pressure in the furnace is maintained below atmospheric pressure in balanced draught system?(a) By forced draught fan(b) By induced fan(c) Depends on the height of chimney(d) By installing Natural draughtI have been asked this question during a job interview.My question is from Draught System in portion Steam Generators & Accessories of Energy Engineering

Answer»

Right CHOICE is (b) By induced fan

Explanation: In balanced draught system, a forced draught fan is installed near the BOILER which helps in overcoming the RESISTANCE of fuel bed by supplying sufficient air for combustion. An induced draught fan is installed near the chimney base removes the flue gases COMING from the furnace and maintains PRESSURE in the furnace slightly below the atmospheric pressure.



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