Question

Which of the following enters the super heater of a boiler?
A) Cold water
B) Hot water
C) Wet steam
D) Super - heated steam

Answer 1

Hint:Boiler is a closed vessel that is generally used for heating liquid and superheater is one of its components.We need to check for the function of this super heater so as to know which of the given options enter the same.

Complete step by step answer:
Super heater is a component of the boiler (used for heating: liquid, steam, etc.).
It is a coiled heat exchanger that heats the steam to produce super - heated steam.
It converts wet steam produced by a boiler to dry stream.
Looking at the options:
i) Cold water and hot water: Super heater only works on steam so neither cold nor hot water can enter it.
ii) Wet steam and super - heated steam: The conversion of wet steam to superheated steam takes place inside a super heater, which means wet steam enters it whereas super – heated steam is generated by it.
Therefore, wet steam enters the super heater of a boiler, and thus the correct option is c).
🡪The boiler uses both sensible (related to change in temperature or object with no phase change) and latent heat (related to changes in phase: liquids gas and solids) whereas super heaters use only sensible heat.

Note:Super heaters are used where there is a requirement of dry steam like in turbines, steam engines, etc. They also minimize the erosion of the blades of the turbine.
It also converts low-quality steam to high-quality steam.