Question

What is the main purpose of using an economizer in a boiler?

(a) To control the process of steam conversion

(b) To reduce energy consumption

(c) To increase the temperature of boiler

(d) To maintain a constant temperature inside a boiler

I got this question during an interview.

Question is taken from Feed Water and Steam Generation System, Working of Thermal Power Plant in portion Steam Power Plant of Energy Engineering

Answer 1

Correct option is (a) To control the process of steam conversion

For explanation I would say: Economizer in boilers is used to heat fluids, upto a certain degree not beyond the boiling point of that fluid. Economizers are named so because they can make use of enthalpy in fluid stream that are hot, thereby making more useful enthalpy and improving the boiler’s efficiency.