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Which materials are used for Super heater tubes?(a) Nickel chromium(b) Alnico(c) Chromium Molybdenum(d) MagnoxI had been asked this question in a national level competition.Question is taken from Boiler Mounting Accessories in portion Steam Generators & Accessories of Energy Engineering

Answer»

The correct answer is (c) Chromium Molybdenum

For explanation I WOULD say: Superheater is made of coils of tubes forming parallel tube circuits connected between HEATERS. The superheater tubes are made of high temperature strengths SPECIAL alloy STEELS such of chromium molybdenum. The coils are HEATED by the heat of combustion gas during their passage from furnace to the chimney.



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