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How is flue gas discharged through the chimneys?(a) By using induced draught fan(b) By using balanced draught fan(c) By using forced draught fan(d) By using mechanical draught fanI had been asked this question during an internship interview.The origin of the question is Cooling Water System, Air & Fuel Gas System topic in portion Steam Power Plant of Energy Engineering

Answer»

Right choice is (a) By using INDUCED draught fan

To explain: After extracting maximum possible heat by CIRCULATING the FLUE gas in furnace. Induce draught fan is used to remove the left over gas via chimney. This is located near the base of the chimney. The air is sucked in by reducing the pressure below atmosphere. The draught produced is independent of temperature of hot gases.



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