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What is the pH value at which the boiler is alkalized?

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What is the pH value at which the boiler is alkalized?

(a) 9.0

(b) 5.4

(c) 6.9

(d) 5.7

I have been asked this question in an interview.

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

1 Answer

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Correct answer is (a) 9.0

To explain I would say: The boiler is alkalized to pH value of 9.0 to reduce oxidization and to support the formation of a stable layer of magnetite on water side surface of the boiler protecting from oxidation. And also oxygen scavengers are used to remove residues of oxides, especially O2 & CO2 [oxygen and carbon dioxide] must be removed. Sodium hydroxide or ammonia is used for alkalization of the feed water.

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