Deaerator Tanks & Expansion Tanks
The Deaerator tank in the boiler acts as a Feed Water Tank to store cold and hot fluid in order to remove dissolved air or non-condensable gases from the fluid. Deaerating feed tank helps in removing non-condensable gases from a feed.
Water or any fluid which is used as a medium for heat transfer generally contains Oxygen and other non-condensable gases in it. These gases dissolved in a fluid act as insulation to heat transfer. Due to the presence of these gases in a fluid, heat transfer rates from fuel to fluid are generally reduced which in turn will increase the fuel required for heating, thereby decreasing the efficiency.
In a deaerator tank carbon dioxide (CO2), Non-dissolved Gas, and oxygen (O2) are released as gases and combined with water (H2O) to form carbonic acid, (H2CO3).
