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Why are salts deposited on the evaporator drum?

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Why are salts deposited on the evaporator drum?

(a) Due to continuous circulation of water

(b) Due to usage of hard water containing calcium content

(c) Due to circulation of impure water

(d) Due to the chemicals added in water

I had been asked this question in homework.

The query is from Types of High Pressure Boilers in division Steam Generators & Accessories of Energy Engineering

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The correct choice is (c) Due to circulation of impure water

To elaborate: The salts are deposited in the evaporator drum (steam generator) due to the circulation of impure water can be easily cleaned by blowing off the water with pressure or by removing the submerged coil from the drum.

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