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Water treatment-Deareation (oxygen control)

For corrosion to take place in boiler oxygen must be present to felicitate the formation of metal oxide hence deareation of feed water is essential. The chemicals serving for deareation of feed water are
hydrazine and sodium sulphate. Hydrazine reacts with oxygen to give nitrogen and water(N2H4+O2 = N2 + 2H20), but excess of hydrazine can cause ammonia in steam line leading to corrosion.  sodium sulphite scavenges oxygen and converts into sodium sulphate.
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