Heat recovery from secondary boiling steam

The unit is designed to utilise heat contained in sources that are wasted (boiler blowdown water, deaerator evaporation, condensate collection tanks, etc.) and is aimed at heating chemically treated water before it enters the deaerator, which will reduce the consumption of live steam to the deaeration unit. ) and aimed at heating chemically treated water before it enters the deaerator, which will reduce the consumption of “live steam” for the deaeration unit.

The source of heat energy that is wasted is most often a two-phase steam-water mixture. The pressure drop produces secondary boiling steam. This mixture enters the secondary steam separator, from where the secondary steam is directed to the steam space of the deaerator. The liquid phase flows through the condensate trap to the blowdown heat recovery heat exchanger, where it gives off its heat to the deaerator feed water and, already cooled, is discharged into the effluent.
The heat recovery heat exchanger condenses the deaerator vapour and transfers the heat to the heating water. The condensed vapour is also discharged to the waste water via a water seal.