May I ask where are the typical points for adding hydrazine and ammonia solution to the boiler feed water?
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May I ask where are the typical points for adding hydrazine and ammonia solution to the boiler feed water?
It should generally be added to the upper part of the boiler.
If conditions permit, it can be added at the inlet of the feed water pump: First, since the pressure is low, a chemical dosing pump with a lower pressure can be used, which saves on investment and electricity consumption during operation. Second, the pump itself is an excellent mixer, ensuring uniform distribution of the medication.
It should be added at the outlet of the feed water pump, as ammonia is alkaline and helps to prevent corrosion of the pump.
Hydrazine is used for deoxygenation and is connected to the deaerator. Ammonia is used to adjust the pH value; our unit is connected to the deaerator and the inlet of the boiler feed water pump.
Hydrazine is a chemical deoxygenizer that should be added to deoxidizers; due to its chemical toxicity, it is now rarely used. Ammonia is used to adjust the pH value of demineralized water. In typical chemical water treatment plants, if it is added and the pH is at the appropriate level, it may not be necessary to use it in the boiler; if it is still used, it can be added at the inlet of the boiler feed water. However, it should be noted that ammonia is corrosive to copper-core valves.