What does oxygen do in boiler water?

Oxygen in water produces pitting that is very severe because of its localized nature. Water containing ammonia, particularly in the presence of oxygen, readily attacks copper and copper bearing alloys. The resulting corrosion leads to deposits on boiler heat transfer surfaces and reduces efficiency and reliability.

Why oxygen is removed from boiler 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. Most of the noncondensable gases (principally oxygen and free carbon dioxide) are released to the steam as the water is sprayed into the unit.

What are the effect of impurities in boiler feed water?

Suspended and dissolved solids in the boiler water tend to deposit in the steam and condensate system. Impurities carried over with the steam cause contamination in the many processes for which steam is used, resulting in overheating, corrosion and reduction of efficiency of the boiler itself and other equipment.

What is boiler feed water treatment?

Feedwater treatment is a pre-water treatment process to control deposition, eradicate impurities and prevent corrosion within a boiler system. In a boiler system, water is transformed into steam and expands by as much as 1000 times as it passes through steam pipes at rates of 100km/hr.

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.

What will happen if oxygen dissolves more in boiler water?

Dissolved oxygen will react with carbon steel throughout the feedwater piping, economizers, and boiler, causing oxygen pitting and eventually leaks. This acid condensate will corrode your steam piping while also adding iron to your boiler water.

Which chemical is used to remove CO2 from boiler feed water?

Deaerators are commonly used to remove dissolved gases in feedwater for steam-generating boilers.

How do you reduce iron in boiler feed water?

Iron oxide is of particular concern in today’s boiler water treatment programs. Deposition from low (less than 1.0 ppm) hardness boiler feedwater is eliminated with chelant programs and can be reduced by up to 95\% by a good polymer/phosphate treatment program.

Why is de aeration important?

Deaeration is used to remove dissolved corrosive gases from plant water streams. The most important application is the removal of oxygen from boiler feedwater systems.

Which chemical is used to remove CO2 from Boiler feed water?