The impact of boiler feedwater temperature on boiler steam quality
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The normal boiler feedwater temperature is 105 degrees after passing through the deaerator. If the heating steam supplied to the deaerator is stopped, the boiler feedwater temperature drops to 49 degrees. What impact does this have on the pH and conductivity of the steam produced by the boiler? Does a low feed water temperature affect the problem of steam-water azeotropy in boilers?
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The reason for keeping the boiler feedwater at a high temperature is to prevent the presence of oxygen in the air. If heating is not carried out and the temperature drops below a certain level, oxygen will dissolve into the water; when this water enters the boiler, the high temperature forces the oxygen to be released… which can lead to damage to the pipe bundles. Therefore, in addition to raising the temperature of the feedwater, it is also necessary to add oxygen scavengers and scale removers to ensure the safe operation of the boiler. PS. If you test the pH of the steam produced by a boiler, it is very likely that you will find it to be alkaline...
A low feedwater temperature directly leads to excessive dissolved oxygen in the feedwater.
Do you mean that the large amount of gas forced out will cause the boiler water to end up in the steam?
If the water temperature in the boiler is low, the oxygen content is high; when this water enters the boiler, it is forced out as a result of heating, appearing in the form of bubbles (think of it like boiling water at home, with bubbles on the surface). When these bubbles burst, they create a \"shock\" effect on the boiler’s tubes. Therefore, to prevent damage to the tubes, the water added should be at a higher temperature. PS: The hot water tank should be connected to the atmosphere; when the temperature of the hot water is high, the oxygen is forced out and flows into the atmosphere