Our feedtanks are designed as atmospheric deaerators to increase efficiency and keep ongoing maintenance costs low.
Stainless steel throughout. No rusting.
No linings, coatings or joints to leak.
Flash condensing deaerator head efficiently combines cold makeup, condensate return and flash recovery.
A feedtank, in a steam plant, is normally the meeting place for
cold make-up water and condensate return.
make-up water and flashing condensate are fed into the tank above the water surface. Flash steam with all its heat is lost to atmosphere and the final mixture of cold make-up and remaining condensate is colder than it could be.
both flows, together with blowdownflash steam are distributed through sparge pipes well below the water surface. The sparge pipes must be of stainless steel if they are to last any length of time and with the necessary supports and the manufacturing time involved they can be expensive.
the make-up water has to be softened and treated to prevent scale formation on the boiler heat transfer surfaces. (This subject is best left to water treatment specialists).Cold water absorbs free oxygen and other gases that are liberated when heated. It is essential to remove the dissolved oxygen before it is released in the boiler to prevent corrosion of the boiler and steam plant.Oxygen in feedwater can be 'driven off' by heating and 'absorbed' by chemical treatment. By heating the feedwater typically to 85°C to remove the bulk of the oxygen the amount of scavenging chemicals required can be reduced by up to 75%. This can additionally improve the boiler efficiency by reducing the blowdown requirements.