Question

What is the main purpose of demineralization treatment plant?

(a) To remove deposits made on tube

(b) To reduce scaling on tube

(c) To remove salts

(d) To filter the boiler water

I had been asked this question by my school teacher while I was bunking the class.

My question is from Types of Fuels in division Steam Power Plant of Energy Engineering

Answer 1

Right answer is (c) To remove salts

To elaborate: The salts (calcium and magnesium) of hard water have to be removed to overcome all types of effects caused by water on tubes. Demineralization treatment plant generally consists of cation, anion and mixed bed exchangers. These ions are recombined with water to form pure water. Very pure mineralized water becomes highly corrosive once it absorbs oxygen.