Brief introduction of thermal deaerator

There are roughly the following types of deaerators: atmospheric thermal deaerator; chemical deaerator (dosing and deaerator); analytical deaerator; vacuum deaerator; sponge iron deaerator, etc. The most widely used is atmospheric deaerator; Drug deaeration is mainly applied to small boilers; analytical deaeration currently has mature theories but no mature technology; vacuum deaeration is very effective, but the cost is high and it is not easy to control; sponge iron deaeration efficiency is very low, Belongs to the elimination type.

The atmospheric thermal deaerator heats the water to reduce the solubility of oxygen, the oxygen in the water continuously escapes, and then the oxygen generated on the water surface is removed together with the water vapor, which can remove various gases in the water (including free CO2, N2).Deoxygenated water does not increase the salt content, nor does it increase the amount of other gases dissolved.

The operation and control of the atmospheric thermal deaerator is relatively easy, and the operation is stable and reliable.Theoretically, the partial pressure of oxygen in the boiling state is zero. The pressure of the deaerator controlled by the ordinary thermal deaerator is about 0.02mpa, and the corresponding saturation temperature is about 104.5 degrees. At this time, it can meet the needs of ordinary low-pressure boiler deaerator water. However, for power station boilers, a pressurized thermal deaerator is generally used, and the water temperature generally reaches 150 degrees to remove trace dissolved oxygen in the water.

Advantages of thermal deaeration: The technology is very mature, and the operation control method is short, stable and reliable.

Advantages and disadvantages of thermal deaeration: Thermal deaeration requires steam supply, which will consume a certain amount of steam; the temperature control range is narrow, only about 2 °C, and the load adaptability is poor. If the operation level is not high, the necessary conditions for the effective operation of the boiler thermal deaerator equipment cannot be met, and the deaeration efficiency and deaeration effect are not ideal.