Deaerator temperature in thermal deaeration
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What is the maximum temperature that the desalinated water used as feedwater to a thermal deaerator can have? Can deaeration still be achieved by raising the temperature of this feedwater to above 100 degrees, with the deaeration steam being discontinued?
A temperature of 104°C is required for oxygen to be decomposed, and steam must also be used to carry the oxygen away after decomposition. Personally, I believe that stopping the supply of deaeration steam does not achieve the desired deaeration effect.
It should be determined based on the local atmospheric pressure; increasing the temperature is feasible, provided that the performance of the main trays is good
What is the feedwater temperature of the deaerators for everyone?
Does the demineralized water you supply to the unit go through heat exchange? Here, the deionized water entering the system is only 40°C, but the amount used is small; in addition, nearly 7 tons of condensate water is reused. The deaeration steam is almost not used at all. The parameters of the mixed deaerated water meet the quality requirements, with an oxygen content of ≤15%, and the actual oxygen content is generally below 7%. The pressure in the deaerator is generally maintained at a slight positive pressure of 0.01–0.02 Mpa, while the temperature is usually between 104–106°C.
The temperature inside the device when we enter is around 38 degrees, and after a series of heat exchange processes it rises to 100 degrees
Water is supplied at room temperature; the temperature needs to reach 104°C. How is deoxidation achieved when it’s not in use? Don’t you run it continuously?
The deoxygenation temperature is 104°C; there are no special requirements regarding the temperature of the deoxygenated water. The power plant uses low-grade steam such as waste steam and flash steam available on site as a heat source, and if that is not sufficient, turbine extraction steam is used as a supplement.
It depends on whether the deaerator uses normal pressure, medium pressure, or high pressure; steam is used to maintain the pressure
We are currently using 1.0 MPa steam for thermal deoxidation; by raising the temperature of the deionized water fed into the deoxidizer, the steam can be almost completely shut off. Have you encountered such a situation?