What is Deaerator? working principle, Types
Deaerators are commonly employed in any chemical process industry or in Power Plants wherever the boiler is utilized for steam production from boiler feed water. Deaerator solves the aim of the removal of unwanted dissolved gases and dissolved oxygen from the boiler feedwater before going in boilers. Most of the deaerators are designed in such how that the dissolved oxygen content within the outlet water is regarding7 ppb by WTC.
Principle of Deaerators
Deaerator commonly works based on subsequent principles.
Henry’s Law
According to Henry’s low is in a liquid the gas solubility is directly proportional to the partial pressure. thus if we tend to decrease the partial pressure of the dissolved gas by adding steam in Deaerator, its solubility decreases and also the gas is faraway from water.
Process Control System In Deaerator
Inverse Solubility of Water
When the temperature of the water is growing, the dissolved oxygen content within the water is decreases. Thus the water temp. is growing by inserting steam in Deaerator, the dissolved gas solubility is reduced and also the gases are withdrawal from water.
Types of Deaerators
1. Tray types Deaerator
Tray type deaerators contain perforated trays within the top of the Deaeration section. The bottom portion volume is high for used as storage for boiler feed water. Feedwater to deaerator enters into the perforated trays wherever the area and residence time is growing to contact with steam. Then the water goes to the horizontal storage section wherever steam is pass through the sparger pipe to withdrawn the remaining traces of dissolved gases and keep the stored water at its saturation temperature.
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| Tray Type Deaerator |
2. Spray type Deaerator
Spray Deaerator type deaerator contains spray nozzle in feed water entry space. it’s then preheated and deaerated and sent to the storage section. In the storage section also steam is additional to stay the water at its saturation temperature.
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| Spray Type Deaerator |
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