vacuum deaerator
1、 Overview of vacuum deaerator:
Deoxygenation is a crucial step in the boiler feedwater treatment process. Oxygen is the main corrosive substance in the water supply system and boiler. The oxygen in the water supply should be quickly removed, otherwise it will corrode the water supply system and components of the boiler. The corrosion product, iron oxide, will enter the boiler and deposit or adhere to the boiler tube wall and heating surface, forming insoluble and poorly heat transferred iron scale. Moreover, corrosion will cause pitting on the inner wall of the pipeline and increase the resistance coefficient. When pipeline corrosion is severe, pipeline explosion accidents may even occur. According to national regulations, steam boilers with an evaporation capacity of 2 tons per hour or more and hot water boilers with a water temperature of 95 ℃ or more must be deoxygenated. For many years, many boiler feedwater treatment workers have been exploring efficient and economical deoxygenation methods, and vacuum deoxygenation method is one of the excellent ones.
2、 Working principle of vacuum deaerator:
The working principle of a vacuum deaerator is based on the application of Henry's Law and Dalton's Law. According to Henry's Law, in a closed container, if any gas exists on the water surface at the same time, the solubility of the gas is proportional to its own partial pressure, and the solubility of the gas is only related to its own partial pressure. Under a certain negative pressure, the partial pressure on the water surface of the vacuum deaerator decreases, and the partial pressure of air and oxygen becomes smaller and smaller. The partial pressure of oxygen decreases to zero, and the dissolved oxygen in water also decreases to zero. When the pressure on the water surface is lower than atmospheric pressure, the solubility of oxygen can also reach zero at lower water temperatures. In this way, oxygen molecules on the water surface are extracted or converted into other gases, so that the partial pressure of oxygen is zero, and oxygen in the water is continuously extracted, achieving the effect of deoxygenation.
3、 Vacuum deaerator model parameters：
|
Model parameters |
ZCY-4 |
ZCY-6 |
ZCY-10 |
ZCY-20 |
ZCY-35 |
ZCY-50 |
ZCY-100 |
|
rated output T/H |
4 |
6 |
10 |
20 |
35 |
50 |
100 |
|
Working vacuum Kpa |
18.6～21.3 |
18.6～21.3 |
18.6～21.3 |
5.3～80 |
5.3～80 |
5.3～80 |
5.3～80 |
|
Saturated water temperature ℃ |
62.5 |
62.5～57.5 |
62.5～57.5 |
42.5～37.5 |
42.5～37.5 |
42.5～37.5 |
42.5～37.5 |
|
Water inlet pressure MPa |
～0.2 |
～0.2 |
～0.2 |
～0.2 |
～0.2 |
～0.2 |
～0.2 |
|
Oxygen content in effluent ug/l |
0.05～0.1 |
0.05～0.1 |
0.05～0.1 |
0.05～0.1 |
0.05～0.1 |
0.05～0.1 |
0.05～0.1 |
|
Diameter of water tank mm |
Φ900 |
Φ1200 |
Φ1400 |
Φ1600 |
Φ1800 |
Φ2000 |
Φ2800 |
|
Deoxygenation head diameter mm |
Φ500 |
Φ600 |
Φ600 |
Φ800 |
Φ900 |
Φ1000 |
Φ1400 |
|
Equipment weight kg |
～1150 |
～1320 |
～1800 |
～2650 |
～3900 |
～5450 |
～8760 |
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