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What methods are used to achieve low levels of corrosion by oxygen in boiler feed water?...

What methods are used to achieve low levels of corrosion by oxygen in boiler feed water? What measurements are essential to ensure that this is done satisfactorily, and what types of measurement could be used?

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Answer #1

To achieve low levels of corrosion by oxygen from feed water in boilers it is required to reduce the amount of oxygen in the feed water. For this, deaerators, chemical scavengers, membrane contractors can be used. A deaerator is used for the removal of oxygen from feed water. Chemical (oxygen) scavengers are used to remove any last trace of oxygen in the feed water. For low pressure systems, sodium sulphite (Na2SO3) is used which will react with the oxygen rapidly to form sodium sulphate (non-scaling). Hydrazine can also be used for properly diluted systems.

The Dissolved Oxygen content (DO), Oxygen Reduction Potential (ORP) are the various measurements taken to ensure the right amount of scavenger is added.

Wrinkler method or DO measuring sensors can be used for DO measurement.

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