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A deaerator is a device that is widely used for the removal of air and other dissolved gases from the feedwater to steam generating boilers.
- What is deaerator used for?
- What is the function of deaerator in a thermal power plant?
- Where is the deaerator located?
- How do you remove oxygen from boiler feed water?
- Does Steam has more oxygen?
- Which chemical is used in deaerator?
- Why is deaerator pressure maintained?
- Why deaerator is used at thermal power plant after condenser?
- How does a vacuum deaerator work?
- Why do deaerator boilers feed water?
- What is the purpose of deaerator Mcq?
- What causes priming in a boiler?
- Which gas is present in steam?
- Does water vapor become oxygen?
What is deaerator used for?
Deaerators are mechanical devices that remove dissolved gases from boiler feedwater. Deaeration protects the steam system from the effects of corrosive gases. It accomplishes this by reducing the concentration of dissolved oxygen and carbon dioxide to a level where corrosion is minimized.
What is the function of deaerator in a thermal power plant?
Thermal deaerators are commonly used to remove dissolved gases in feedwater for steam-generating boilers. Dissolved oxygen in feedwater will cause serious corrosion damage in a boiler by attaching to the walls of metal piping and other equipment and forming oxides (like rust).
Where is the deaerator located?
Deaerators are placed at height to provide sufficient NPSHa (Net Positive Suction Head available) to the boiler feedwater pumps – the boiler feed pumps are typically situated low in the ship for the same reason.
How do you remove oxygen from boiler feed water?
Heat is the most common method for removing oxygen. Typical deaeration for smaller boilers utilizes a spray or combination spray and tray system to remove oxygen. The feed water is sprayed into a stream of 5 psig steam for efficient heat transfer and subsequent oxygen removal.
Does Steam has more oxygen?
It can be created by heating Water to 101.4 °C or Polluted Water to 121.4 °C. Steam is denser than Oxygen or Natural Gas, but lighter than Sour Gas and Chlorine.
Which chemical is used in deaerator?
Deaeration steam:
The most commonly used oxygen scavenger is sodium sulfite (Na2SO3). It is very effective and rapidly reacts with traces of oxygen to form sodium sulfate (Na2SO4) which is non-scaling.
Why is deaerator pressure maintained?
Steam pressure inside the deaerator has to be maintained to facilitate the removal of dissolved gases from water and also to provide adequate NPSH to boiler feed water pump. ... Pressure Relief valve is also fitted to avoid pressurization of deaerator due to malfunctioning of pressure control valve.
Why deaerator is used at thermal power plant after condenser?
In thermal power plants, the deaerator is used mainly to. Remove air from condenser. Increase feed water temperature.
How does a vacuum deaerator work?
Vacuum deaerators remove dissolved gasses from boiler feeds. Removing these gasses via vacuum is more economical than removing them through chemicals. The systems reduce corrosion in boiler tubes caused by dissolved oxygen and carbon dioxide.
Why do deaerator boilers feed water?
The purpose of a deaerator is to reduce dissolved gases, particularly oxygen, to a low level and improve a plant's thermal efficiency by raising the water temperature. In addition, deaerators provide feedwater storage and proper suction conditions for boiler feedwater pumps.
What is the purpose of deaerator Mcq?
Explanation: Purpose of deaerator is to remove the dissolved oxygen and carbon dioxide in water which makes water corrosive.
What causes priming in a boiler?
Priming may be caused by improper construction of boiler, excessive ratings, or sudden fluctuations in steam demand. Priming is sometimes aggravated by impurities in the boiler-water. Some mechanical entrainment of minute drops of boiler water in the steam always occurs.
Which gas is present in steam?
When water is heated it evaporates, which means it turns into water vapor and expands. At 100℃ it boils, thus rapidly evaporating. And at boiling point, the invisible gas of steam is created. The opposite of evaporation is condensation, which is when water vapor condenses back into tiny droplets of water.
Does water vapor become oxygen?
An appreciable fraction of water will be decomposed into hydrogen and oxygen at a temperature high enough so that the Gibbs free energy change for the decomposition reaction equals zero. ... At these temperatures there is not much dissociation of water vapor.
