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Why boiler draught is most essential part of the thermal plants?

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Why boiler draught is most essential part of the thermal plants?

(a) Serves combustion by supplying ample amount of air

(b) Helps in maintaining air ventilation

(c) Required to maintain constant air flow

(d) Stabilizes the boiler system

The question was posed to me in an internship interview.

Origin of the question is Draught System in division Steam Generators & Accessories of Energy Engineering

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The correct option is (c) Required to maintain constant air flow

Explanation: Boiler draught is the difference of pressure required to maintain constant flow of air into the furnace and to discharge the flue gases to the atmosphere through a chimney. Thus boiler draught is one of the most essential systems of thermal plant. Boiler draught is generated by using chimney, fan, steam jet or air jet or combination of them.

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