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At what temperature is the water in convection super heater is heated of Loffler boiler?

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At what temperature is the water in convection super heater is heated of Loffler boiler?

(a) 200^oC

(b) 300^oC

(c) 400^oC

(d) 500^oC

I had been asked this question by my college professor while I was bunking the class.

My enquiry is from Types of High Pressure Boilers topic in portion Steam Generators & Accessories of Energy Engineering

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The correct answer is (d) 500^oC

For explanation I would say: Steam coming out of the radiant super heater enters the convection where it is finally heated to the desired temperature of 500°C. The convection superheater receives heat from the flue gases entered by convective heat transfer. Both radiant and convective super heaters are arranged in the series in the path of flue gases.

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