Question

What is the function of Re-heater in the boiler?

(a) To get excess amount of heat

(b) To make utilize of the left over water in the tubes

(c) Re-super heat partly expanded steam

(d) Better heating efficiency in winters

I had been asked this question in semester exam.

Origin of the question is Boiler Mounting Accessories in chapter Steam Generators & Accessories of Energy Engineering

Answer 1

The correct answer is (c) Re-super heat partly expanded steam

Easy explanation: The function of Re-heater is to re-superheat the partly expanded steam from the turbine so that the steam remains dry as far as possible through the last stage of turbine. Modern plants have reheaters as well as super heaters in the same gas passage of the boiler.